rename G0:G070

2026-03-22 01:31:21 +03:00 · 2026-03-01 23:12:53 +03:00
parent 1f4f111c52
commit 71d30dd19a
136 changed files with 0 additions and 0 deletions
--- a/G0:G070,G0B1/RTC/Makefile
+++ b/G0:G070,G0B1/RTC/Makefile
@@ -0,0 +1,8 @@
+BINARY      := rtc
+# MCU code
+MCU         := G070xx
+# change this linking script depending on particular MCU model,
+LDSCRIPT    := stm32g070xb.ld
+
+include ../makefile.g0
+include ../../makefile.stm32
--- a/G0:G070,G0B1/RTC/Makefile.old
+++ b/G0:G070,G0B1/RTC/Makefile.old
@@ -0,0 +1,164 @@
+BINARY		= rtc
+BOOTPORT	?= /dev/ttyUSB0
+BOOTSPEED	?= 115200
+# MCU FAMILY
+FAMILY		= G0
+# MCU code
+MCU			= G070xx
+#DEFS		= -DEBUG -g3
+# change this linking script depending on particular MCU model,
+# for example, if you have STM32F103VBT6, you should write:
+LDSCRIPT	= stm32g070xb.ld
+
+INDEPENDENT_HEADERS=
+
+FP_FLAGS	?= -msoft-float
+ASM_FLAGS	= -mthumb -mcpu=cortex-m0plus -march=armv6-m -mtune=cortex-m0plus
+ARCH_FLAGS	= $(ASM_FLAGS) $(FP_FLAGS)
+
+# autoincremental version & build date
+VERSION_FILE = version.inc
+ifeq ($(shell test -e $(VERSION_FILE) && echo -n yes), yes)
+    NEXTVER := $(shell expr $$(awk '/#define BUILD_NUMBER/' $(VERSION_FILE) | tr -cd "[0-9]") + 1)
+else
+    NEXTVER := "1"
+endif
+
+BUILDDATE := $(shell date +%Y-%m-%d)
+
+###############################################################################
+# Executables
+PREFIX		?= /opt/bin/arm-none-eabi
+
+RM			:= rm -f
+RMDIR		:= rmdir
+SIZE        := $(PREFIX)-size
+CC			:= $(PREFIX)-gcc
+LD			:= $(PREFIX)-gcc
+AR			:= $(PREFIX)-ar
+AS			:= $(PREFIX)-as
+OBJCOPY		:= $(PREFIX)-objcopy
+OBJDUMP		:= $(PREFIX)-objdump
+GDB			:= $(PREFIX)-gdb
+STFLASH		:= $(shell which st-flash)
+STBOOT		:= $(shell which stm32flash)
+
+###############################################################################
+# Source files
+OBJDIR 		= mk
+LDSCRIPT	?= $(BINARY).ld
+SRC			:= $(wildcard *.c)
+OBJS		:= $(addprefix $(OBJDIR)/, $(SRC:%.c=%.o))
+STARTUP		= $(OBJDIR)/startup.o
+OBJS 		+= $(STARTUP)
+DEPS		:= $(OBJS:.o=.d)
+
+INC_DIR ?= ../inc
+
+INCLUDE 	:= -I$(INC_DIR)/Fx -I$(INC_DIR)/cm
+LIB_DIR		:= $(INC_DIR)/ld
+
+###############################################################################
+# C flags
+CFLAGS		+= -O2 -MD -D__thumb2__=1
+CFLAGS		+= -Wall -Werror -Wextra -Wshadow -Wimplicit-function-declaration
+CFLAGS		+= -Wredundant-decls $(INCLUDE)
+# -Wmissing-prototypes -Wstrict-prototypes
+CFLAGS		+= -fno-common -ffunction-sections -fdata-sections -flto
+
+###############################################################################
+# Linker flags
+LDFLAGS		+= --static -nostartfiles --specs=nano.specs -flto
+LDFLAGS		+= -L$(LIB_DIR)
+LDFLAGS		+= -T$(LDSCRIPT)
+LDFLAGS		+= -Wl,-Map=$(OBJDIR)/$(BINARY).map
+LDFLAGS		+= -Wl,--gc-sections
+
+###############################################################################
+# Used libraries
+LDLIBS		+= -Wl,--start-group -lc -lgcc -Wl,--end-group
+LDLIBS		+= $(shell $(CC) $(CFLAGS) -print-libgcc-file-name)
+
+DEFS		+= -DSTM32$(FAMILY) -DSTM32$(MCU)
+
+#.SUFFIXES: .elf .bin .hex .srec .list .map .images
+#.SECONDEXPANSION:
+#.SECONDARY:
+
+ELF		:= $(OBJDIR)/$(BINARY).elf
+LIST	:= $(OBJDIR)/$(BINARY).list
+BIN		:= $(BINARY).bin
+HEX		:= $(BINARY).hex
+
+all: bin list size
+
+elf: $(ELF)
+bin: $(BIN)
+hex: $(HEX)
+list: $(LIST)
+
+ifneq ($(MAKECMDGOALS),clean)
+-include $(DEPS)
+endif
+
+$(OBJDIR):
+	mkdir $(OBJDIR)
+
+$(STARTUP): $(INC_DIR)/startup/vector.c
+	$(CC) $(CFLAGS) $(DEFS) $(INCLUDE) $(ARCH_FLAGS) -o $@ -c $<
+
+$(VERSION_FILE): *.[ch]
+	[ -f $(VERSION_FILE) ] || echo -e "#define BUILD_NUMBER \"0\"\n#define BUILD_DATE \"none\"" > $(VERSION_FILE)
+	@echo "  Generate version: $(NEXTVER) for date $(BUILDDATE)"
+	@sed -i "s/#define BUILD_NUMBER.*/#define BUILD_NUMBER \"$(NEXTVER)\"/" $(VERSION_FILE)
+	@sed -i "s/#define BUILD_DATE.*/#define BUILD_DATE \"$(BUILDDATE)\"/" $(VERSION_FILE)
+
+# Uncomment and rename file, which includes version.inc
+#$(OBJDIR)/proto.o: proto.c $(VERSION_FILE)
+
+$(OBJDIR)/%.o: %.c
+	@echo "  CC      $<"
+	$(CC) $(CFLAGS) $(DEFS) $(INCLUDE) $(ARCH_FLAGS) -o $@ -c $<
+
+#$(OBJDIR)/%.d: %.c $(OBJDIR)
+#	$(CC) -MM -MG $< | sed -e 's,^\([^:]*\)\.o[ ]*:,$(@D)/\1.o $(@D)/\1.d:,' >$@
+
+$(BIN): $(ELF)
+	@echo "  OBJCOPY $(BIN)"
+	$(OBJCOPY) -Obinary $(ELF) $(BIN)
+
+$(HEX): $(ELF)
+	@echo "  OBJCOPY $(HEX)"
+	$(OBJCOPY) -Oihex $(ELF) $(HEX)
+
+$(LIST): $(ELF)
+	@echo "  OBJDUMP $(LIST)"
+	$(OBJDUMP) -S $(ELF) > $(LIST)
+
+$(ELF): $(OBJDIR) $(OBJS)
+	@echo "  LD      $(ELF)"
+	$(LD) $(LDFLAGS) $(ARCH_FLAGS) $(OBJS) $(LDLIBS) -o $(ELF)
+
+clean:
+	@echo "  CLEAN"
+	$(RM) $(OBJS) $(DEPS) $(ELF) $(HEX) $(LIST) $(OBJDIR)/*.map
+	@rmdir $(OBJDIR) 2>/dev/null || true
+
+size: $(ELF)
+	$(SIZE) -Ax $(ELF)
+
+flash: $(BIN)
+	@echo "  FLASH  $(BIN)"
+	$(STFLASH) write $(BIN) 0x8000000
+
+boot: $(BIN)
+	@echo "  LOAD $(BIN) through bootloader"
+	$(STBOOT) -b$(BOOTSPEED) $(BOOTPORT) -w $(BIN)
+
+openocd:
+	openocd -f openocd.cfg
+dbg:
+	arm-none-eabi-gdb $(ELF) -ex 'target extended-remote localhost:3333' -ex 'monitor reset halt'
+
+
+.PHONY: clean flash boot size openocd dbg
--- a/G0:G070,G0B1/RTC/README
+++ b/G0:G070,G0B1/RTC/README
@@ -0,0 +1,12 @@
+Simplest work with RTC
+
+Proto:
+
+C - set/print calibration ticks (-511..+512) to each 2^20 ticks
+Sd - set date (YY MM DD Weekday)
+St - set time (HH MM SS)
+t - print current Tms
+T - print current Time
+
+Button press - print current time @ usart3
+
--- a/G0:G070,G0B1/RTC/main.c
+++ b/G0:G070,G0B1/RTC/main.c
@@ -0,0 +1,71 @@
+/*
+ * This file is part of the rtc project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stm32g0.h>
+
+#include "proto.h"
+#include "rtc.h"
+#include "strfunc.h"
+#include "usart.h"
+
+// KEY (intpullup->0) - PC0
+// LED - PC8
+
+volatile uint32_t Tms = 0;
+
+/* Called when systick fires */
+void sys_tick_handler(void){
+    ++Tms;
+}
+
+static void gpio_setup(void){
+    RCC->IOPENR |= RCC_IOPENR_GPIOCEN; // enable PC
+    // set PC8 as opendrain output, PC0 is pullup input, other as default (AIN)
+    GPIOC->MODER = (0xffffffff & ~(GPIO_MODER_MODE8 | GPIO_MODER_MODE0)) | GPIO_MODER_MODER8_O;
+    GPIOC->PUPDR = GPIO_PUPDR0_PU; // pullup
+    GPIOC->OTYPER = GPIO_OTYPER_OT8; // open drain
+}
+
+int main(void){
+    StartHSE();
+    rtc_setup();
+    SysTick_Config(8000); // 1ms counter
+    gpio_setup();
+    usart3_setup();
+    uint32_t T = 0;
+    int sent = 0;
+    /* Do nothing in main loop */
+    while (1){
+        if(Tms - T > 499){ // blink LED
+            T = Tms;
+            pin_toggle(GPIOC, 1<<8);
+            usart3_sendbuf();
+        }
+        if(pin_read(GPIOC, 1<<0) == 0){ // key pressed - send time over USART
+            if(!sent){
+                print_curtime();
+                sent = 1;
+            }
+        }else sent = 0;
+        int wasbo = 0;
+        char *rcv = usart3_getline(&wasbo);
+        if(wasbo) usart3_sendstr("Buffer overflow occured @ last message\n");
+        if(rcv) rcv = (char*)parse_cmd(rcv);
+        if(rcv) usart3_sendstr(rcv);
+    }
+}
--- a/G0:G070,G0B1/RTC/openocd.cfg
+++ b/G0:G070,G0B1/RTC/openocd.cfg
@@ -0,0 +1,89 @@
+# script for stm32g0x family
+
+#
+# stm32g0 devices support SWD transports only.
+#
+source [find interface/stlink.cfg]
+source [find target/swj-dp.tcl]
+source [find mem_helper.tcl]
+
+if { [info exists CHIPNAME] } {
+	set _CHIPNAME $CHIPNAME
+} else {
+	set _CHIPNAME stm32g0x
+}
+
+set _ENDIAN little
+
+# Work-area is a space in RAM used for flash programming
+# Smallest proposed target has 8kB ram, use 4kB by default to avoid surprises
+if { [info exists WORKAREASIZE] } {
+	set _WORKAREASIZE $WORKAREASIZE
+} else {
+	set _WORKAREASIZE 0x1000
+}
+
+#jtag scan chain
+if { [info exists CPUTAPID] } {
+	set _CPUTAPID $CPUTAPID
+} else {
+	# Section 37.5.5 - corresponds to Cortex-M0+
+	set _CPUTAPID 0x0bc11477
+}
+
+swj_newdap $_CHIPNAME cpu -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_CPUTAPID
+dap create $_CHIPNAME.dap -chain-position $_CHIPNAME.cpu
+
+set _TARGETNAME $_CHIPNAME.cpu
+target create $_TARGETNAME cortex_m -endian $_ENDIAN -dap $_CHIPNAME.dap
+
+$_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size $_WORKAREASIZE -work-area-backup 0
+
+set _FLASHNAME $_CHIPNAME.flash
+flash bank $_FLASHNAME stm32l4x 0 0 0 0 $_TARGETNAME
+
+# reasonable default
+adapter speed 2000
+
+adapter srst delay 100
+if {[using_jtag]} {
+	jtag_ntrst_delay 100
+}
+
+reset_config srst_nogate
+
+if {![using_hla]} {
+	# if srst is not fitted use SYSRESETREQ to
+	# perform a soft reset
+	cortex_m reset_config sysresetreq
+}
+
+proc stm32g0x_default_reset_start {} {
+	# Reset clock is HSI16 (16 MHz)
+	adapter speed 2000
+}
+
+proc stm32g0x_default_examine_end {} {
+	# DBGMCU_CR |= DBG_STANDBY | DBG_STOP
+	mmw 0x40015804 0x00000006 0
+
+	# Stop watchdog counters during halt
+	# DBGMCU_APB1_FZ |= DBG_IWDG_STOP | DBG_WWDG_STOP
+	mmw 0x40015808 0x00001800 0
+}
+
+proc stm32g0x_default_reset_init {} {
+	# Increase clock to 64 Mhz
+	mmw 0x40022000 0x00000002 0x00000005	;# FLASH_ACR: Latency = 2
+	mww 0x4002100C 0x30000802				;# RCC_PLLCFGR = PLLR=/2, PLLN=8, PLLM=/1, PLLSRC=0x2
+	mmw 0x40021000 0x01000000 0x00000000	;# RCC_CR |= PLLON
+	mmw 0x40021008 0x00000002 0x00000005	;# RCC_CFGR: SW=PLLRCLK
+
+	# Boost JTAG frequency
+	adapter speed 4000
+}
+
+# Default hooks
+$_TARGETNAME configure -event examine-end { stm32g0x_default_examine_end }
+$_TARGETNAME configure -event reset-start { stm32g0x_default_reset_start }
+$_TARGETNAME configure -event reset-init { stm32g0x_default_reset_init }
--- a/G0:G070,G0B1/RTC/proto.c
+++ b/G0:G070,G0B1/RTC/proto.c
@@ -0,0 +1,149 @@
+/*
+ * This file is part of the rtc project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stm32g0.h>
+#include <string.h>
+
+#include "rtc.h"
+#include "strfunc.h"
+#include "usart.h"
+
+extern volatile uint32_t Tms;
+
+const char *helpstring =
+        "C - set/print calibration ticks (-511..+512) to each 2^20 ticks\n"
+        "Sd - set date (YY MM DD Weekday)\n"
+        "St - set time (HH MM SS)\n"
+        "t - print current Tms\n"
+        "T - print current Time\n"
+;
+
+TRUE_INLINE void putch(char x){
+    usart3_send(&x, 1);
+}
+
+static const char *weekdays[] = {"Mon", "Tue", "Wed", "Thur", "Fri", "Sat", "Sun"};
+static const char *months[] = {"Jan", "Feb", "Mar", "Apr", "May", "June", "July", "Aug", "Sept", "Oct", "Nov", "Dec"};
+static const char *OK = "OK\n";
+
+static void prezero(uint8_t x){
+    if(x < 10){ putch('0'); putch('0' + x);}
+    else USND(u2str(x));
+}
+
+void print_curtime(){
+    rtc_t t;
+    get_curtime(&t);
+    USND(weekdays[t.weekday - 1]);
+    putch(' ');
+    USND(months[t.month - 1]);
+    putch(' ');
+    USND(u2str(t.day));
+    putch(' ');
+    prezero(t.hour);
+    putch(':');
+    prezero(t.minute);
+    putch(':');
+    prezero(t.second);
+    USND(" 20"); prezero(t.year);
+    putch('\n');
+}
+
+static int readNu8(const char *buf, uint8_t *arr, int maxlen){
+    uint32_t D;
+    const char *nxt;
+    int N = 0;
+    while((nxt = getnum(buf, &D)) && nxt != buf && N < maxlen){
+        buf = nxt;
+        if(D > 0xff){
+            USND("Value too large\n");
+            return N;
+        }
+        arr[N++] = (uint8_t) D&0xff;
+    }
+    return N;
+}
+
+TRUE_INLINE const char* setdatetime(const char *buf){
+    buf = omit_spaces(buf);
+    uint8_t array[4];
+    rtc_t r;
+    switch(*buf){
+        case 'd': // set date
+            if(4 != readNu8(buf+1, array, 4))
+                return "Format: YY MM DD Weekday (monday is 1)\n";
+            r.year = array[0]; 
+            r.month = array[1];
+            r.day = array[2];
+            r.weekday = array[3];
+            if(!rtc_setdate(&r)) return "Wrong date format\n";
+        break;
+        case 't': // set time
+            if(3 != readNu8(buf+1, array, 3))
+                return "Format: HH MM SS\n";
+            r.hour = array[0];
+            r.minute = array[1];
+            r.second = array[2];
+            if(!rtc_settime(&r)) return "Wrong time format\n";
+        break;
+        default:
+            return "Sd -> set date; St -> set time\n";
+    }
+    return OK;
+}
+
+TRUE_INLINE const char *setcal(const char *buf){
+    int32_t v;
+    if(buf == getint(buf, &v)){
+        USND("Calibration value: ");
+        USND(i2str(rtc_getcalib()));
+        putch('\n');
+        return NULL;
+    } 
+    if(!rtc_setcalib(v)) return "Enter value: -511..+512\n";
+    return OK;
+}
+
+const char *parse_cmd(char *buf){
+    const char *x = omit_spaces(buf);
+    // "long" commands
+    switch(*x){
+        case 'S':
+            return setdatetime(x + 1);
+        break;
+        case 'C':
+            return setcal(x + 1);
+        break;
+    }
+    // "short" commands
+    if(x[1]) return x; // echo wrong data
+    switch(*x){
+        case 't':
+            USND("T=");
+            USND(u2str(Tms));
+            putch('\n');
+        break;
+        case 'T':
+            print_curtime();
+        break;
+        default: // help
+            USND(helpstring);
+        break;
+    }
+    return NULL;
+}
--- a/G0:G070,G0B1/RTC/proto.h
+++ b/G0:G070,G0B1/RTC/proto.h
@@ -0,0 +1,22 @@
+/*
+ * This file is part of the rtc project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+const char *parse_cmd(char *buf);
+void print_curtime();
--- a/G0:G070,G0B1/RTC/rtc.bin
+++ b/G0:G070,G0B1/RTC/rtc.bin
--- a/G0:G070,G0B1/RTC/rtc.c
+++ b/G0:G070,G0B1/RTC/rtc.c
@@ -0,0 +1,136 @@
+/*
+ * This file is part of the rtc project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stm32g0.h>
+
+#include "rtc.h"
+
+#ifndef WAITWHILE
+#define WAITWHILE(x)  do{register uint32_t StartUpCounter = 0; while((x) && (++StartUpCounter < 0xffffff)){nop();}}while(0)
+#endif
+
+static const uint8_t maxdays[12] = {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
+
+// i - in, r - rest of divide
+#if 0
+static uint16_t div10s(uint16_t i, uint16_t *r){ // divide by 10
+    uint32_t u = i;
+    u *= 52429;
+    u >>= 19;
+    if(r) *r = i - 10*u;
+    return (uint16_t)u;
+}
+#endif
+static uint8_t div10b(uint8_t i, uint8_t *r){ // divide by 10
+    uint32_t u = i;
+    u *= 52429;
+    u >>= 19;
+    if(r) *r = i - 10*u;
+    return (uint8_t)u;
+}
+
+static uint8_t DEC2BCD(uint8_t x){
+    uint8_t d, r;
+    d = div10b(x, &r);
+    return (d << 4 | r);
+}
+
+int rtc_setdate(rtc_t *d){
+    if(d->year > 99) return FALSE;
+    if(d->month > 12 || d->month == 0) return FALSE;
+    if(d->day > maxdays[d->month - 1] || d->day == 0) return FALSE;
+    if(d->month == 2 && d->day == 29){
+        uint8_t test = (d->year >> 2) << 2;
+        if(d->year != test) return FALSE; // not leap year
+    }
+    if(d->weekday > 7 || d->weekday == 0) return FALSE;
+    RTC->ICSR |= RTC_ICSR_INIT;
+    WAITWHILE(!(RTC->ICSR & RTC_ICSR_INITF));
+    RTC->DR = DEC2BCD(d->year) << RTC_DR_YU_Pos | d->weekday << RTC_DR_WDU_Pos | DEC2BCD(d->month) << RTC_DR_MU_Pos | DEC2BCD(d->day) << RTC_DR_DU_Pos;
+    RTC->ICSR &= ~RTC_ICSR_INIT;
+    return TRUE;
+}
+
+int rtc_settime(rtc_t *t){
+    if(t->hour > 23) return FALSE;
+    if(t->minute > 59) return FALSE;
+    if(t->second > 59) return FALSE;
+    RTC->ICSR |= RTC_ICSR_INIT;
+    WAITWHILE(!(RTC->ICSR & RTC_ICSR_INITF));
+    RTC->TR = DEC2BCD(t->hour) << RTC_TR_HU_Pos | DEC2BCD(t->minute) << RTC_TR_MNU_Pos | DEC2BCD(t->second) << RTC_TR_SU_Pos;
+    RTC->ICSR &= ~RTC_ICSR_INIT;
+    return TRUE;
+}
+
+void rtc_setup(){
+    PWR->CR1 |= PWR_CR1_DBP; // disable RTC write protection
+    // turn on LSE and switch RTC to it
+    RCC->APBENR1 |= RCC_APBENR1_RTCAPBEN;
+    RCC->BDCR = RCC_BDCR_LSEON;
+    WAITWHILE(!(RCC->BDCR & RCC_BDCR_LSERDY));
+    RCC->BDCR |= RCC_BDCR_RTCEN | RCC_BDCR_RTCSEL_0;
+    // unlock RCC
+    RTC->WPR = 0xCA;
+    RTC->WPR = 0x53;
+    RTC->ICSR |= RTC_ICSR_INIT;
+    WAITWHILE(!(RTC->ICSR & RTC_ICSR_INITF));
+    RTC->PRER = (0x7f << RTC_PRER_PREDIV_A_Pos) | 0xff; // prediv_a = 127, prediv_s = 255
+    // here we can init starting time: monday of 1 jan 2001, 00:00:00
+//    RTC->DR = 1 << RTC_DR_YU_Pos | 1 << RTC_DR_WDU_Pos | 1 << RTC_DR_MU_Pos | 1 << RTC_DR_DU_Pos;
+//    RTC->TR = 0;
+    // RTC->CR is default - 0
+    // now turn off INIT bit, RTC will go on
+    RTC->ICSR &= ~RTC_ICSR_INIT;
+}
+
+void get_curtime(rtc_t *t){
+    WAITWHILE(!(RTC->ICSR & RTC_ICSR_RSF));
+    register uint32_t r = RTC->TR;
+    #define BCDu(shift)     ((r >> shift) & 0xf)
+    t->second = BCDu(RTC_TR_SU_Pos) + 10 * BCDu(RTC_TR_ST_Pos);
+    t->minute = BCDu(RTC_TR_MNU_Pos) + 10 * BCDu(RTC_TR_MNT_Pos);
+    t->hour = BCDu(RTC_TR_HU_Pos) + 10 * BCDu(RTC_TR_HT_Pos);
+    r = RTC->DR;
+    t->day = BCDu(RTC_DR_DU_Pos) + 10 * BCDu(RTC_DR_DT_Pos);
+    t->month = BCDu(RTC_DR_MU_Pos);
+    if(r & RTC_DR_MT) t->month += 10;
+    t->weekday = (r >> RTC_DR_WDU_Pos) & 0x7;
+    t->year = BCDu(RTC_DR_YU_Pos) + 10 * BCDu(RTC_DR_YT_Pos);
+}
+
+// set calibration value
+int rtc_setcalib(int calval){
+    if(calval < -511 || calval > 512) return FALSE;
+    uint32_t calp = 0, calm = 0;
+    if(calval < 0)  calm = -calval;
+    else if(calval > 0){
+        calp = RTC_CALR_CALP;
+        calm = 512 - calval;
+    }
+    // unlock RCC
+    RTC->WPR = 0xCA;
+    RTC->WPR = 0x53;
+    RTC->CALR = calp | calm;
+    return 1;
+}
+
+int rtc_getcalib(){
+    int calval = (RTC->CALR & RTC_CALR_CALP) ? 512 : 0;
+    calval -= RTC->CALR & 0x1ff;
+    return calval;
+}
--- a/G0:G070,G0B1/RTC/rtc.cflags
+++ b/G0:G070,G0B1/RTC/rtc.cflags
@@ -0,0 +1 @@
+-std=c17
--- a/G0:G070,G0B1/RTC/rtc.config
+++ b/G0:G070,G0B1/RTC/rtc.config
@@ -0,0 +1,3 @@
+#define EBUG
+#define STM32G0
+#define STM32G070xx
--- a/G0:G070,G0B1/RTC/rtc.creator
+++ b/G0:G070,G0B1/RTC/rtc.creator
@@ -0,0 +1 @@
+[General]
--- a/G0:G070,G0B1/RTC/rtc.creator.user
+++ b/G0:G070,G0B1/RTC/rtc.creator.user
@@ -0,0 +1,171 @@
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+<!DOCTYPE QtCreatorProject>
+<!-- Written by QtCreator 8.0.2, 2022-12-22T21:13:47. -->
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--- a/G0:G070,G0B1/RTC/rtc.cxxflags
+++ b/G0:G070,G0B1/RTC/rtc.cxxflags
@@ -0,0 +1 @@
+-std=c++17
--- a/G0:G070,G0B1/RTC/rtc.files
+++ b/G0:G070,G0B1/RTC/rtc.files
@@ -0,0 +1,11 @@
+main.c
+rtc.c
+rtc.h
+usart.c
+usart.h
+strfunc.c
+strfunc.h
+proto.c
+proto.h
+i2c.c
+i2c.h
--- a/G0:G070,G0B1/RTC/rtc.h
+++ b/G0:G070,G0B1/RTC/rtc.h
@@ -0,0 +1,40 @@
+/*
+ * This file is part of the rtc project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+
+// time, day of week (1 - monday), and date (1 - january)
+typedef struct{
+    uint8_t second;
+    uint8_t minute;
+    uint8_t hour;
+    uint8_t weekday;
+    uint8_t day;
+    uint8_t month;
+    uint8_t year;
+} rtc_t;
+
+void rtc_setup();
+
+void get_curtime(rtc_t *t);
+int rtc_setdate(rtc_t *d);
+int rtc_settime(rtc_t *t);
+int rtc_setcalib(int calval);
+int rtc_getcalib();
--- a/G0:G070,G0B1/RTC/rtc.includes
+++ b/G0:G070,G0B1/RTC/rtc.includes
@@ -0,0 +1,4 @@
+.
+../inc
+../inc/Fx
+../inc/cm
--- a/G0:G070,G0B1/RTC/strfunc.c
+++ b/G0:G070,G0B1/RTC/strfunc.c
@@ -0,0 +1,274 @@
+/*
+ * This file is part of the rtc project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stm32g0.h>
+
+/**
+ * @brief hexdump - dump hex array by 16 bytes in string
+ * @param sendfun - function to send data
+ * @param arr - array to dump
+ * @param len - length of `arr`
+ */
+void hexdump(int (*sendfun)(const char *s), uint8_t *arr, uint16_t len){
+    char buf[52], *bptr = buf;
+    for(uint16_t l = 0; l < len; ++l, ++arr){
+        for(int16_t j = 1; j > -1; --j){
+            register uint8_t half = (*arr >> (4*j)) & 0x0f;
+            if(half < 10) *bptr++ = half + '0';
+            else *bptr++ = half - 10 + 'a';
+        }
+        if(l % 16 == 15){
+            *bptr++ = '\n';
+            *bptr = 0;
+            sendfun(buf);
+            bptr = buf;
+        }else *bptr++ = ' ';
+    }
+    if(bptr != buf){
+        *bptr++ = '\n';
+        *bptr = 0;
+        sendfun(buf);
+    }
+}
+
+/**
+ * @brief _2str - convert value into string buffer
+ * @param val - |value|
+ * @param minus - ==0 if value > 0
+ * @return buffer with number
+ */
+static char *_2str(uint32_t  val, uint8_t minus){
+    static char strbuf[12];
+    char *bufptr = &strbuf[11];
+    *bufptr = 0;
+    if(!val){
+        *(--bufptr) = '0';
+    }else{
+        while(val){
+            uint32_t x = val / 10;
+            *(--bufptr) = (val - 10*x) + '0';
+            val = x;
+            //*(--bufptr) = val % 10 + '0';
+            //val /= 10;
+        }
+    }
+    if(minus) *(--bufptr) = '-';
+    return bufptr;
+}
+
+// return string with number `val`
+char *u2str(uint32_t val){
+    return _2str(val, 0);
+}
+char *i2str(int32_t i){
+    uint8_t minus = 0;
+    uint32_t val;
+    if(i < 0){
+        minus = 1;
+        val = -i;
+    }else val = i;
+    return _2str(val, minus);
+}
+
+/**
+ * @brief uhex2str - print 32bit unsigned int as hex
+ * @param val - value
+ * @return string with number
+ */
+char *uhex2str(uint32_t val){
+    static char buf[12] = "0x";
+    int npos = 2;
+    uint8_t *ptr = (uint8_t*)&val + 3;
+    int8_t i, j, z=1;
+    for(i = 0; i < 4; ++i, --ptr){
+        if(*ptr == 0){ // omit leading zeros
+            if(i == 3) z = 0;
+            if(z) continue;
+        }
+        else z = 0;
+        for(j = 1; j > -1; --j){
+            uint8_t half = (*ptr >> (4*j)) & 0x0f;
+            if(half < 10) buf[npos++] = half + '0';
+            else buf[npos++] = half - 10 + 'a';
+        }
+    }
+    buf[npos] = 0;
+    return buf;
+}
+
+/**
+ * @brief omit_spaces - eliminate leading spaces and other trash in string
+ * @param buf - string
+ * @return - pointer to first character in `buf` > ' '
+ */
+const char *omit_spaces(const char *buf){
+    while(*buf){
+        if(*buf > ' ') break;
+        ++buf;
+    }
+    return buf;
+}
+
+/**
+ * @brief getdec - read decimal number & return pointer to next non-number symbol
+ * @param buf - string
+ * @param N - number read
+ * @return Next non-number symbol. In case of overflow return `buf` and N==0xffffffff
+ */
+static const char *getdec(const char *buf, uint32_t *N){
+    char *start = (char*)buf;
+    uint32_t num = 0;
+    while(*buf){
+        char c = *buf;
+        if(c < '0' || c > '9'){
+            break;
+        }
+        if(num > 429496729 || (num == 429496729 && c > '5')){ // overflow
+            *N = 0xffffff;
+            return start;
+        }
+        num *= 10;
+        num += c - '0';
+        ++buf;
+    }
+    *N = num;
+    return buf;
+}
+// read hexadecimal number (without 0x prefix!)
+static const char *gethex(const char *buf, uint32_t *N){
+    const char *start = buf;
+    uint32_t num = 0;
+    while(*buf){
+        char c = *buf;
+        uint8_t M = 0;
+        if(c >= '0' && c <= '9'){
+            M = '0';
+        }else if(c >= 'A' && c <= 'F'){
+            M = 'A' - 10;
+        }else if(c >= 'a' && c <= 'f'){
+            M = 'a' - 10;
+        }
+        if(M){
+            if(num & 0xf0000000){ // overflow
+                *N = 0xffffff;
+                return start;
+            }
+            num <<= 4;
+            num += c - M;
+        }else{
+            break;
+        }
+        ++buf;
+    }
+    *N = num;
+    return buf;
+}
+// read octal number (without 0 prefix!)
+static const char *getoct(const char *buf, uint32_t *N){
+    const char *start = (char*)buf;
+    uint32_t num = 0;
+    while(*buf){
+        char c = *buf;
+        if(c < '0' || c > '7'){
+            break;
+        }
+        if(num & 0xe0000000){ // overflow
+            *N = 0xffffff;
+            return start;
+        }
+        num <<= 3;
+        num += c - '0';
+        ++buf;
+    }
+    *N = num;
+    return buf;
+}
+// read binary number (without b prefix!)
+static const char *getbin(const char *buf, uint32_t *N){
+    const char *start = (char*)buf;
+    uint32_t num = 0;
+    while(*buf){
+        char c = *buf;
+        if(c < '0' || c > '1'){
+            break;
+        }
+        if(num & 0x80000000){ // overflow
+            *N = 0xffffff;
+            return start;
+        }
+        num <<= 1;
+        if(c == '1') num |= 1;
+        ++buf;
+    }
+    *N = num;
+    return buf;
+}
+
+/**
+ * @brief getnum - read uint32_t from string (dec, hex or bin: 127, 0x7f, 0b1111111)
+ * @param buf - buffer with number and so on
+ * @param N   - the number read
+ * @return pointer to first non-number symbol in buf
+ *      (if it is == buf, there's no number or if *N==0xffffffff there was overflow)
+ */
+const char *getnum(const char *txt, uint32_t *N){
+    const char *nxt = NULL;
+    const char *s = omit_spaces(txt);
+    if(*s == '0'){ // hex, oct or 0
+        if(s[1] == 'x' || s[1] == 'X'){ // hex
+            nxt = gethex(s+2, N);
+            if(nxt == s+2) nxt = (char*)txt;
+        }else if(s[1] > '0'-1 && s[1] < '8'){ // oct
+            nxt = getoct(s+1, N);
+            if(nxt == s+1) nxt = (char*)txt;
+        }else{ // 0
+            nxt = s+1;
+            *N = 0;
+        }
+    }else if(*s == 'b' || *s == 'B'){
+        nxt = getbin(s+1, N);
+        if(nxt == s+1) nxt = (char*)txt;
+    }else{
+        nxt = getdec(s, N);
+        if(nxt == s) nxt = (char*)txt;
+    }
+    return nxt;
+}
+
+// get signed integer
+const char *getint(const char *txt, int32_t *I){
+    const char *s = omit_spaces(txt);
+    int32_t sign = 1;
+    uint32_t U;
+    if(*s == '-'){
+    	sign = -1;
+    	++s;
+    }
+    const char *nxt = getnum(s, &U);
+    if(nxt == s) return txt;
+    if(U & 0x80000000) return txt; // overfull
+    *I = sign * (int32_t)U;
+    return nxt;
+}
+
+/*
+void mymemcpy(char *dest, const char *src, int len){
+    if(len < 1) return;
+    while(len--) *dest++ = *src++;
+}
+*/
--- a/G0:G070,G0B1/RTC/strfunc.h
+++ b/G0:G070,G0B1/RTC/strfunc.h
@@ -0,0 +1,30 @@
+/*
+ * This file is part of the rtc project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <string.h>
+
+void hexdump(int (*sendfun)(const char *s), uint8_t *arr, uint16_t len);
+const char *u2str(uint32_t val);
+const char *i2str(int32_t i);
+const char *uhex2str(uint32_t val);
+const char *getnum(const char *txt, uint32_t *N);
+const char *omit_spaces(const char *buf);
+const char *getint(const char *txt, int32_t *I);
+//void mymemcpy(char *dest, const char *src, int len);
--- a/G0:G070,G0B1/RTC/usart.c
+++ b/G0:G070,G0B1/RTC/usart.c
@@ -0,0 +1,177 @@
+/*
+ * This file is part of the rtc project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stm32g0.h>
+#include <string.h>
+
+#include "usart.h"
+
+// RX/TX DMA->CCR without EN flag
+#define DMARXCCR    (DMA_CCR_MINC | DMA_CCR_TCIE | DMA_CCR_TEIE)
+#define DMATXCCR    (DMA_CCR_MINC | DMA_CCR_DIR | DMA_CCR_TCIE | DMA_CCR_TEIE)
+
+volatile int u3txrdy = 1, u3rxrdy = 0; // transmission done, next line received
+static volatile int bufovr = 0, wasbufovr = 0; // Rx buffer overflow or error flag -> delete next line
+static volatile int rbufno = 0, tbufno = 0; // current buf number
+static volatile char rbuf[2][UARTBUFSZ], tbuf[2][UARTBUFSZ]; // receive & transmit buffers
+static volatile int rxlen[2] = {0}, txlen[2] = {0};
+
+char *usart3_getline(int *wasbo){
+    if(wasbo) *wasbo = wasbufovr;
+    wasbufovr = 0;
+    if(!u3rxrdy) return NULL;
+    u3rxrdy = 0; // clear ready flag
+    return (char*)rbuf[!rbufno]; // current buffer is in filling stage, return old - filled - buffer
+}
+
+#define USART_BRR(speed)    ((64000000 + speed/2) / speed)
+
+// USART3 @ PD8 (Tx) and PD9 (Rx) - both AF0
+void usart3_setup(){
+    RCC->IOPENR |= RCC_IOPENR_GPIODEN; // enable PD
+    RCC->AHBENR |= RCC_AHBENR_DMA1EN; // enable DMA1
+    // set PD8 and PD9 as AF
+    GPIOD->MODER = (GPIOD->MODER & ~(GPIO_MODER_MODE8 | GPIO_MODER_MODE9))
+            | GPIO_MODER_MODER8_AF | GPIO_MODER_MODER9_AF;
+    // AF0 for USART3 @ PD8/PD9
+    GPIOD->AFR[1] = GPIOD->AFR[1] & ~(GPIO_AFRH_AFSEL8 | GPIO_AFRH_AFSEL9);
+    // enable USART3 clocking
+    RCC->APBENR1 |= RCC_APBENR1_USART3EN;
+    // baudrate 115200
+    USART3->BRR = USART_BRR(115200);
+    // eol character: '/n'
+    USART3->CR2 = USART_CR2_ADD_VAL('\n');
+    // enable DMA transmission
+    USART3->CR3 = USART_CR3_DMAT | USART_CR3_DMAR;
+    // set up DMA channels: 2 - Tx, 3 - Rx
+    // Tx channel: mem++, mem->periph, 8bit, compl.&err. irq
+    DMA1_Channel2->CCR = DMATXCCR;
+    DMA1_Channel2->CPAR = (uint32_t) &USART3->TDR; // peripherial address
+    // Rx channel: mem++, periph->mem, 8bit, compl.&err. irq
+    DMA1_Channel3->CCR = DMARXCCR;
+    DMA1_Channel3->CPAR = (uint32_t) &USART3->RDR; // peripherial address
+    DMA1_Channel3->CNDTR = UARTBUFSZ;
+    DMA1_Channel3->CMAR = (uint32_t)&rbuf[rbufno];
+    // set up DMAMUX channels: 55 - USART3_TX, 54 - USART3_RX
+    // enumeration of DMAMUX starts from 0 (DMA - from 1)!
+    DMAMUX1_Channel1->CCR = 55;
+    DMAMUX1_Channel2->CCR = 54;
+    // charmatch interrupt, enable transmitter and receiver, enable usart
+    USART3->CR1 = USART_CR1_CMIE | USART_CR1_TE | USART_CR1_RE | USART_CR1_UE;
+    USART3->ICR = 0xffffffff; // clear all flags
+    DMA1_Channel3->CCR = DMARXCCR | DMA_CCR_EN; // start receiving right now
+    NVIC_EnableIRQ(USART3_4_IRQn);
+    NVIC_EnableIRQ(DMA1_Channel2_3_IRQn);
+}
+
+static int usart3_sendN(const char *str, int len){
+    int rest = UARTBUFSZ - txlen[tbufno];
+    if(rest == 0 && !u3txrdy) return 0; // buffer is full while transmission in process
+    if(len < rest) rest = len;
+    memcpy((char*)(tbuf[tbufno] + txlen[tbufno]), str, rest);
+    txlen[tbufno] += rest;
+    if(!u3txrdy) return rest;
+    if(txlen[tbufno] == UARTBUFSZ) usart3_sendbuf();
+    if(rest == len) return len;
+    len -= rest;
+    // now fill another - empty - buffer
+    if(len > UARTBUFSZ) len = UARTBUFSZ;
+    memcpy((char*)tbuf[tbufno], str + rest, len);
+    txlen[tbufno] = len;
+    return rest + len;
+}
+
+void usart3_send(const char *str, int len){
+    while(len){
+        int sent = usart3_sendN(str, len);
+        str += sent;
+        len -= sent;
+    }
+}
+
+void usart3_sendstr(const char *str){
+    int l = strlen(str);
+    usart3_send(str, l);
+}
+
+/**
+ * @brief usart3_sendbuf - send current buffer
+ */
+void usart3_sendbuf(){
+    if(!u3txrdy || txlen[tbufno] == 0) return;
+    // set up DMA
+    DMA1_Channel2->CCR = DMATXCCR;
+    DMA1_Channel2->CMAR = (uint32_t)&tbuf[tbufno];
+    DMA1_Channel2->CNDTR = txlen[tbufno];
+    USART3->ICR = USART_ICR_TCCF; // clear TC flag
+    u3txrdy = 0;
+    // activate DMA
+    DMA1_Channel2->CCR = DMATXCCR | DMA_CCR_EN;
+    tbufno = !tbufno; // swap buffers
+    txlen[tbufno] = 0;
+}
+
+// return amount of bytes sents
+int usart3_send_blocking(const char *str, int len){
+    if(!u3txrdy) return 0;
+    USART3->CR1 |= USART_CR1_TE;
+    for(int i = 0; i < len; ++i){
+        while(!(USART3->ISR & USART_ISR_TXE_TXFNF));
+        USART3->TDR = *str++;
+    }
+    return len;
+}
+
+// interrupt by '\n'
+void usart3_4_isr(){
+    if(USART3->ISR & USART_ISR_CMF){ // got '\n' @ USART3
+        DMA1_Channel3->CCR = DMARXCCR;
+        if(!bufovr){ // forget about broken line @ buffer overflow
+            u3rxrdy = 1;
+            int l = UARTBUFSZ - DMA1_Channel3->CNDTR - 1; // strlen
+            rxlen[rbufno] = l;
+            rbuf[rbufno][l] = 0;
+            rbufno = !rbufno;
+        }else{
+            bufovr = 0;
+            wasbufovr = 1;
+        }
+        // reload DMA Rx with next buffer
+        DMA1_Channel3->CMAR = (uint32_t)&rbuf[rbufno];
+        DMA1_Channel3->CNDTR = UARTBUFSZ;
+        DMA1_Channel3->CCR = DMARXCCR | DMA_CCR_EN;
+    }
+    USART3->ICR = 0xffffffff; // clear all flags
+}
+
+// ch2 - Tx, ch3 - Rx
+void dma1_channel2_3_isr(){
+    uint32_t isr = DMA1->ISR;
+    if(isr & (DMA_ISR_TCIF2 | DMA_ISR_TEIF2)){ // transfer complete or error
+        u3txrdy = 1;
+    }
+    if(isr & (DMA_ISR_TCIF3 | DMA_ISR_TEIF3)){ // receive complete or error -> buffer overflow
+        if(rbuf[rbufno][UARTBUFSZ-1] != '\n'){ // last symbol is not a newline
+            bufovr = 1;
+            DMA1_Channel3->CCR = DMARXCCR;
+            DMA1_Channel3->CNDTR = UARTBUFSZ;
+            DMA1_Channel3->CCR = DMARXCCR | DMA_CCR_EN;
+        }
+    }
+    DMA1->IFCR = 0xff0; // clear all flags for 2&3
+}
--- a/G0:G070,G0B1/RTC/usart.h
+++ b/G0:G070,G0B1/RTC/usart.h
@@ -0,0 +1,32 @@
+/*
+ * This file is part of the rtc project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#define UARTBUFSZ   (64)
+
+#define USND(t)  do{usart3_sendstr(t);}while(0)
+
+extern volatile int u3txrdy, u3rxrdy;
+
+void usart3_setup();
+int usart3_send_blocking(const char *str, int len);
+void usart3_send(const char *str, int len);
+void usart3_sendbuf();
+char *usart3_getline(int *wasbo);
+void usart3_sendstr(const char *str);
--- a/G0:G070,G0B1/RTC/version.inc
+++ b/G0:G070,G0B1/RTC/version.inc
@@ -0,0 +1,2 @@
+#define BUILD_NUMBER "1"
+#define BUILD_DATE "2023-01-18"
--- a/G0:G070,G0B1/blink/Makefile
+++ b/G0:G070,G0B1/blink/Makefile
@@ -0,0 +1,9 @@
+BINARY      := blink
+# MCU code
+MCU         := G070xx
+# change this linking script depending on particular MCU model,
+LDSCRIPT    := stm32g070xb.ld
+
+include ../makefile.g0
+include ../../makefile.stm32
+
--- a/G0:G070,G0B1/blink/Makefile.old
+++ b/G0:G070,G0B1/blink/Makefile.old
@@ -0,0 +1,145 @@
+BINARY		= blink
+BOOTPORT	?= /dev/ttyUSB0
+BOOTSPEED	?= 115200
+# MCU FAMILY
+FAMILY		= G0
+# MCU code
+MCU			= G070xx
+#DEFS		= -DEBUG -g3
+# change this linking script depending on particular MCU model,
+# for example, if you have STM32F103VBT6, you should write:
+LDSCRIPT	= stm32g070xb.ld
+
+INDEPENDENT_HEADERS=
+
+FP_FLAGS	?= -msoft-float
+ASM_FLAGS	= -mthumb -mcpu=cortex-m0plus -march=armv6-m -mtune=cortex-m0plus
+ARCH_FLAGS	= $(ASM_FLAGS) $(FP_FLAGS)
+
+###############################################################################
+# Executables
+PREFIX		?= /opt/bin/arm-none-eabi
+
+RM			:= rm -f
+RMDIR		:= rmdir
+SIZE        := $(PREFIX)-size
+CC			:= $(PREFIX)-gcc
+LD			:= $(PREFIX)-gcc
+AR			:= $(PREFIX)-ar
+AS			:= $(PREFIX)-as
+OBJCOPY		:= $(PREFIX)-objcopy
+OBJDUMP		:= $(PREFIX)-objdump
+GDB			:= $(PREFIX)-gdb
+STFLASH		:= $(shell which st-flash)
+STBOOT		:= $(shell which stm32flash)
+
+###############################################################################
+# Source files
+OBJDIR 		= mk
+LDSCRIPT	?= $(BINARY).ld
+SRC			:= $(wildcard *.c)
+OBJS		:= $(addprefix $(OBJDIR)/, $(SRC:%.c=%.o))
+STARTUP		= $(OBJDIR)/startup.o
+OBJS 		+= $(STARTUP)
+DEPS		:= $(OBJS:.o=.d)
+
+INC_DIR ?= ../inc
+
+INCLUDE 	:= -I$(INC_DIR)/Fx -I$(INC_DIR)/cm
+LIB_DIR		:= $(INC_DIR)/ld
+
+###############################################################################
+# C flags
+CFLAGS		+= -O2 -MD -D__thumb2__=1
+CFLAGS		+= -Wall -Werror -Wextra -Wshadow -Wimplicit-function-declaration
+CFLAGS		+= -Wredundant-decls $(INCLUDE)
+# -Wmissing-prototypes -Wstrict-prototypes
+CFLAGS		+= -fno-common -ffunction-sections -fdata-sections -flto
+
+###############################################################################
+# Linker flags
+LDFLAGS		+= --static -nostartfiles --specs=nano.specs -flto
+LDFLAGS		+= -L$(LIB_DIR)
+LDFLAGS		+= -T$(LDSCRIPT)
+LDFLAGS		+= -Wl,-Map=$(OBJDIR)/$(BINARY).map
+LDFLAGS		+= -Wl,--gc-sections
+
+###############################################################################
+# Used libraries
+LDLIBS		+= -Wl,--start-group -lc -lgcc -Wl,--end-group
+LDLIBS		+= $(shell $(CC) $(CFLAGS) -print-libgcc-file-name)
+
+DEFS		+= -DSTM32$(FAMILY) -DSTM32$(MCU)
+
+#.SUFFIXES: .elf .bin .hex .srec .list .map .images
+#.SECONDEXPANSION:
+#.SECONDARY:
+
+ELF		:= $(OBJDIR)/$(BINARY).elf
+LIST	:= $(OBJDIR)/$(BINARY).list
+BIN		:= $(BINARY).bin
+HEX		:= $(BINARY).hex
+
+all: bin list size
+
+elf: $(ELF)
+bin: $(BIN)
+hex: $(HEX)
+list: $(LIST)
+
+ifneq ($(MAKECMDGOALS),clean)
+-include $(DEPS)
+endif
+
+$(OBJDIR):
+	mkdir $(OBJDIR)
+
+$(STARTUP): $(INC_DIR)/startup/vector.c
+	$(CC) $(CFLAGS) $(DEFS) $(INCLUDE) $(ARCH_FLAGS) -o $@ -c $<
+
+$(OBJDIR)/%.o: %.c
+	@echo "  CC      $<"
+	$(CC) $(CFLAGS) $(DEFS) $(INCLUDE) $(ARCH_FLAGS) -o $@ -c $<
+
+#$(OBJDIR)/%.d: %.c $(OBJDIR)
+#	$(CC) -MM -MG $< | sed -e 's,^\([^:]*\)\.o[ ]*:,$(@D)/\1.o $(@D)/\1.d:,' >$@
+
+$(BIN): $(ELF)
+	@echo "  OBJCOPY $(BIN)"
+	$(OBJCOPY) -Obinary $(ELF) $(BIN)
+
+$(HEX): $(ELF)
+	@echo "  OBJCOPY $(HEX)"
+	$(OBJCOPY) -Oihex $(ELF) $(HEX)
+
+$(LIST): $(ELF)
+	@echo "  OBJDUMP $(LIST)"
+	$(OBJDUMP) -S $(ELF) > $(LIST)
+
+$(ELF): $(OBJDIR) $(OBJS)
+	@echo "  LD      $(ELF)"
+	$(LD) $(LDFLAGS) $(ARCH_FLAGS) $(OBJS) $(LDLIBS) -o $(ELF)
+
+clean:
+	@echo "  CLEAN"
+	$(RM) $(OBJS) $(DEPS) $(ELF) $(HEX) $(LIST) $(OBJDIR)/*.map
+	@rmdir $(OBJDIR) 2>/dev/null || true
+
+size: $(ELF)
+	$(SIZE) -Ax $(ELF)
+
+flash: $(BIN)
+	@echo "  FLASH  $(BIN)"
+	$(STFLASH) write $(BIN) 0x8000000
+
+boot: $(BIN)
+	@echo "  LOAD $(BIN) through bootloader"
+	$(STBOOT) -b$(BOOTSPEED) $(BOOTPORT) -w $(BIN)
+
+openocd:
+	openocd -f openocd.cfg
+dbg:
+	arm-none-eabi-gdb $(ELF) -ex 'target remote localhost:3333' -ex 'monitor reset halt'
+
+
+.PHONY: clean flash boot size openocd dbg
--- a/G0:G070,G0B1/blink/README
+++ b/G0:G070,G0B1/blink/README
@@ -0,0 +1,3 @@
+Toggle LED on STM32G070-pill depending on user button:
+- pressed - 'SOS' in Morze
+- not pressed - blink with period of 1 second
--- a/G0:G070,G0B1/blink/blink.bin
+++ b/G0:G070,G0B1/blink/blink.bin
--- a/G0:G070,G0B1/blink/blink.cflags
+++ b/G0:G070,G0B1/blink/blink.cflags
@@ -0,0 +1 @@
+-std=c17
--- a/G0:G070,G0B1/blink/blink.config
+++ b/G0:G070,G0B1/blink/blink.config
@@ -0,0 +1,3 @@
+#define EBUG
+#define STM32G0
+#define STM32G070xx
--- a/G0:G070,G0B1/blink/blink.creator
+++ b/G0:G070,G0B1/blink/blink.creator
@@ -0,0 +1 @@
+[General]
--- a/G0:G070,G0B1/blink/blink.creator.user
+++ b/G0:G070,G0B1/blink/blink.creator.user
@@ -0,0 +1,171 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE QtCreatorProject>
+<!-- Written by QtCreator 8.0.2, 2022-12-22T21:13:47. -->
+<qtcreator>
+ <data>
+  <variable>EnvironmentId</variable>
+  <value type="QByteArray">{7bd84e39-ca37-46d3-be9d-99ebea85bc0d}</value>
+ </data>
+ <data>
+  <variable>ProjectExplorer.Project.ActiveTarget</variable>
+  <value type="int">0</value>
+ </data>
+ <data>
+  <variable>ProjectExplorer.Project.EditorSettings</variable>
+  <valuemap type="QVariantMap">
+   <value type="bool" key="EditorConfiguration.AutoIndent">true</value>
+   <value type="bool" key="EditorConfiguration.AutoSpacesForTabs">false</value>
+   <value type="bool" key="EditorConfiguration.CamelCaseNavigation">true</value>
+   <valuemap type="QVariantMap" key="EditorConfiguration.CodeStyle.0">
+    <value type="QString" key="language">Cpp</value>
+    <valuemap type="QVariantMap" key="value">
+     <value type="QByteArray" key="CurrentPreferences">CppGlobal</value>
+    </valuemap>
+   </valuemap>
+   <valuemap type="QVariantMap" key="EditorConfiguration.CodeStyle.1">
+    <value type="QString" key="language">QmlJS</value>
+    <valuemap type="QVariantMap" key="value">
+     <value type="QByteArray" key="CurrentPreferences">QmlJSGlobal</value>
+    </valuemap>
+   </valuemap>
+   <value type="int" key="EditorConfiguration.CodeStyle.Count">2</value>
+   <value type="QByteArray" key="EditorConfiguration.Codec">KOI8-R</value>
+   <value type="bool" key="EditorConfiguration.ConstrainTooltips">false</value>
+   <value type="int" key="EditorConfiguration.IndentSize">4</value>
+   <value type="bool" key="EditorConfiguration.KeyboardTooltips">false</value>
+   <value type="int" key="EditorConfiguration.MarginColumn">80</value>
+   <value type="bool" key="EditorConfiguration.MouseHiding">true</value>
+   <value type="bool" key="EditorConfiguration.MouseNavigation">true</value>
+   <value type="int" key="EditorConfiguration.PaddingMode">1</value>
+   <value type="bool" key="EditorConfiguration.PreferSingleLineComments">false</value>
+   <value type="bool" key="EditorConfiguration.ScrollWheelZooming">true</value>
+   <value type="bool" key="EditorConfiguration.ShowMargin">false</value>
+   <value type="int" key="EditorConfiguration.SmartBackspaceBehavior">0</value>
+   <value type="bool" key="EditorConfiguration.SmartSelectionChanging">true</value>
+   <value type="bool" key="EditorConfiguration.SpacesForTabs">true</value>
+   <value type="int" key="EditorConfiguration.TabKeyBehavior">0</value>
+   <value type="int" key="EditorConfiguration.TabSize">8</value>
+   <value type="bool" key="EditorConfiguration.UseGlobal">true</value>
+   <value type="bool" key="EditorConfiguration.UseIndenter">false</value>
+   <value type="int" key="EditorConfiguration.Utf8BomBehavior">1</value>
+   <value type="bool" key="EditorConfiguration.addFinalNewLine">true</value>
+   <value type="bool" key="EditorConfiguration.cleanIndentation">false</value>
+   <value type="bool" key="EditorConfiguration.cleanWhitespace">true</value>
+   <value type="QString" key="EditorConfiguration.ignoreFileTypes">*.md, *.MD, Makefile</value>
+   <value type="bool" key="EditorConfiguration.inEntireDocument">false</value>
+   <value type="bool" key="EditorConfiguration.skipTrailingWhitespace">true</value>
+  </valuemap>
+ </data>
+ <data>
+  <variable>ProjectExplorer.Project.PluginSettings</variable>
+  <valuemap type="QVariantMap">
+   <valuemap type="QVariantMap" key="AutoTest.ActiveFrameworks">
+    <value type="bool" key="AutoTest.Framework.Boost">true</value>
+    <value type="bool" key="AutoTest.Framework.CTest">false</value>
+    <value type="bool" key="AutoTest.Framework.Catch">true</value>
+    <value type="bool" key="AutoTest.Framework.GTest">true</value>
+    <value type="bool" key="AutoTest.Framework.QtQuickTest">true</value>
+    <value type="bool" key="AutoTest.Framework.QtTest">true</value>
+   </valuemap>
+   <valuemap type="QVariantMap" key="AutoTest.CheckStates"/>
+   <value type="int" key="AutoTest.RunAfterBuild">0</value>
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+    <valuelist type="QVariantList" key="ClangTools.SelectedFiles"/>
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+   </valuemap>
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+    <value type="bool" key="ProjectExplorer.DeployConfiguration.CustomDataEnabled">false</value>
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+    <valuelist type="QVariantList" key="PE.EnvironmentAspect.Changes"/>
+    <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">ProjectExplorer.CustomExecutableRunConfiguration</value>
+    <value type="QString" key="ProjectExplorer.RunConfiguration.BuildKey"></value>
+    <value type="bool" key="RunConfiguration.UseCppDebugger">false</value>
+    <value type="bool" key="RunConfiguration.UseCppDebuggerAuto">true</value>
+    <value type="bool" key="RunConfiguration.UseQmlDebugger">false</value>
+    <value type="bool" key="RunConfiguration.UseQmlDebuggerAuto">true</value>
+   </valuemap>
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+  <value type="int">1</value>
+ </data>
+ <data>
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+  <value type="int">22</value>
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--- a/G0:G070,G0B1/blink/blink.cxxflags
+++ b/G0:G070,G0B1/blink/blink.cxxflags
@@ -0,0 +1 @@
+-std=c++17
--- a/G0:G070,G0B1/blink/blink.files
+++ b/G0:G070,G0B1/blink/blink.files
@@ -0,0 +1 @@
+systick_blink.c
--- a/G0:G070,G0B1/blink/blink.includes
+++ b/G0:G070,G0B1/blink/blink.includes
@@ -0,0 +1,4 @@
+.
+../inc
+../inc/Fx
+../inc/cm
--- a/G0:G070,G0B1/blink/openocd.cfg
+++ b/G0:G070,G0B1/blink/openocd.cfg
@@ -0,0 +1,89 @@
+# script for stm32g0x family
+
+#
+# stm32g0 devices support SWD transports only.
+#
+source [find interface/stlink.cfg]
+source [find target/swj-dp.tcl]
+source [find mem_helper.tcl]
+
+if { [info exists CHIPNAME] } {
+	set _CHIPNAME $CHIPNAME
+} else {
+	set _CHIPNAME stm32g0x
+}
+
+set _ENDIAN little
+
+# Work-area is a space in RAM used for flash programming
+# Smallest proposed target has 8kB ram, use 4kB by default to avoid surprises
+if { [info exists WORKAREASIZE] } {
+	set _WORKAREASIZE $WORKAREASIZE
+} else {
+	set _WORKAREASIZE 0x1000
+}
+
+#jtag scan chain
+if { [info exists CPUTAPID] } {
+	set _CPUTAPID $CPUTAPID
+} else {
+	# Section 37.5.5 - corresponds to Cortex-M0+
+	set _CPUTAPID 0x0bc11477
+}
+
+swj_newdap $_CHIPNAME cpu -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_CPUTAPID
+dap create $_CHIPNAME.dap -chain-position $_CHIPNAME.cpu
+
+set _TARGETNAME $_CHIPNAME.cpu
+target create $_TARGETNAME cortex_m -endian $_ENDIAN -dap $_CHIPNAME.dap
+
+$_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size $_WORKAREASIZE -work-area-backup 0
+
+set _FLASHNAME $_CHIPNAME.flash
+flash bank $_FLASHNAME stm32l4x 0 0 0 0 $_TARGETNAME
+
+# reasonable default
+adapter speed 2000
+
+adapter srst delay 100
+if {[using_jtag]} {
+	jtag_ntrst_delay 100
+}
+
+reset_config srst_nogate
+
+if {![using_hla]} {
+	# if srst is not fitted use SYSRESETREQ to
+	# perform a soft reset
+	cortex_m reset_config sysresetreq
+}
+
+proc stm32g0x_default_reset_start {} {
+	# Reset clock is HSI16 (16 MHz)
+	adapter speed 2000
+}
+
+proc stm32g0x_default_examine_end {} {
+	# DBGMCU_CR |= DBG_STANDBY | DBG_STOP
+	mmw 0x40015804 0x00000006 0
+
+	# Stop watchdog counters during halt
+	# DBGMCU_APB1_FZ |= DBG_IWDG_STOP | DBG_WWDG_STOP
+	mmw 0x40015808 0x00001800 0
+}
+
+proc stm32g0x_default_reset_init {} {
+	# Increase clock to 64 Mhz
+	mmw 0x40022000 0x00000002 0x00000005	;# FLASH_ACR: Latency = 2
+	mww 0x4002100C 0x30000802				;# RCC_PLLCFGR = PLLR=/2, PLLN=8, PLLM=/1, PLLSRC=0x2
+	mmw 0x40021000 0x01000000 0x00000000	;# RCC_CR |= PLLON
+	mmw 0x40021008 0x00000002 0x00000005	;# RCC_CFGR: SW=PLLRCLK
+
+	# Boost JTAG frequency
+	adapter speed 4000
+}
+
+# Default hooks
+$_TARGETNAME configure -event examine-end { stm32g0x_default_examine_end }
+$_TARGETNAME configure -event reset-start { stm32g0x_default_reset_start }
+$_TARGETNAME configure -event reset-init { stm32g0x_default_reset_init }
--- a/G0:G070,G0B1/blink/systick_blink.c
+++ b/G0:G070,G0B1/blink/systick_blink.c
@@ -0,0 +1,78 @@
+/*
+ * This file is part of the blink project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "stm32g0.h"
+
+// KEY (intpullup->0) - PC0
+// LED - PC8
+
+static volatile uint32_t blink_ctr = 0;
+
+/* Called when systick fires */
+void sys_tick_handler(void){
+    ++blink_ctr;
+}
+
+/*
+ * Set up timer to fire every x milliseconds
+ */
+static void systick_setup(uint32_t xms){ // xms < 2098!!!
+    static uint32_t curms = 0;
+    if(curms == xms) return;
+    // 8MHz - HCLK/8
+    // this function also clears counter so it starts right away
+    SysTick_Config(8000 * xms); // arg should be < 0xffffff, so ms should be < 2098
+    curms = xms;
+}
+
+
+static void gpio_setup(void){
+    RCC->IOPENR = RCC_IOPENR_GPIOCEN; // enable PC
+    // set PC8 as opendrain output, PC0 is pullup input, other as default (AIN)
+    GPIOC->MODER = (0xffffffff & ~(GPIO_MODER_MODE8 | GPIO_MODER_MODE0)) | GPIO_MODER_MODER8_O;
+    GPIOC->PUPDR = GPIO_PUPDR0_PU; // pullup
+    GPIOC->OTYPER = GPIO_OTYPER_OT8; // open drain
+}
+
+static const uint32_t L[] = {125,100,125,100,125,200, 350,100,350,100,350,200, 125,100,125,100,125, 1000};
+
+int main(void){
+    StartHSE();
+    gpio_setup();
+    systick_setup(500);
+    uint32_t M = 0;
+    int pressed = 0;
+    /* Do nothing in main loop */
+    while (1){
+        if(pin_read(GPIOC, 1<<0) == 0){ // key not pressed - 'sos'
+            pressed = 1;
+            systick_setup(L[M]);
+            if(M & 1) pin_set(GPIOC, 1<<8);
+            else pin_clear(GPIOC, 1<<8);
+            if(++M == 18) M = 0;
+        }else{ // key pressed - blink with period of 1s
+            if(pressed){
+                M = 0;
+                pressed = 0;
+                systick_setup(500);
+            }
+            if(blink_ctr & 1) pin_set(GPIOC, 1<<8);
+            else pin_clear(GPIOC, 1<<8);
+        }
+    }
+}
--- a/G0:G070,G0B1/flash/Makefile
+++ b/G0:G070,G0B1/flash/Makefile
@@ -0,0 +1,9 @@
+BINARY      := flash
+# MCU code
+MCU         := G070xx
+# change this linking script depending on particular MCU model,
+LDSCRIPT    := stm32g070xb.ld
+
+include ../makefile.g0
+include ../../makefile.stm32
+
--- a/G0:G070,G0B1/flash/README
+++ b/G0:G070,G0B1/flash/README
@@ -0,0 +1,2 @@
+USART3 @ PD8/PD9 (115200, 8N1)
+EEPROM in Flash emulation
--- a/G0:G070,G0B1/flash/flash.bin
+++ b/G0:G070,G0B1/flash/flash.bin
--- a/G0:G070,G0B1/flash/flash.c
+++ b/G0:G070,G0B1/flash/flash.c
@@ -0,0 +1,198 @@
+/*
+ * This file is part of the flash project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stm32g0.h>
+#include <string.h> // memcpy
+#include "flash.h"
+#include "strfunc.h"
+#include "usart.h"
+
+extern const uint32_t __varsstart, _BLOCKSIZE;
+
+static const uint32_t blocksize = (uint32_t)&_BLOCKSIZE;
+
+// max amount of Config records stored (will be recalculate in flashstorage_init()
+static uint32_t maxCnum = 1024 / sizeof(user_conf); // can't use blocksize here
+
+#define DEFMF   {.haveencoder = 1, .donthold = 1, .eswinv = 1, .keeppos = 1}
+
+#define USERCONF_INITIALIZER  {             \
+     .userconf_sz = sizeof(user_conf)       \
+    ,.flagU16 = 0xabcd                      \
+    ,.flagU32 = 0xdeadbeef                  \
+    ,.str = "test string"                   \
+    }
+
+static int erase_flash(const void*, const void*);
+static int write2flash(const void*, const void*, uint32_t);
+// don't write `static` here, or get error:
+//      'memcpy' forming offset 8 is out of the bounds [0, 4] of object '__varsstart' with type 'uint32_t'
+const user_conf *Flash_Data = (const user_conf *)(&__varsstart);
+
+user_conf the_conf = USERCONF_INITIALIZER;
+
+static int currentconfidx = -1; // index of current configuration
+
+/**
+ * @brief binarySearch - binary search in flash for last non-empty cell
+ *          any struct searched should have its sizeof() @ the first field!!!
+ * @param l - left index
+ * @param r - right index (should be @1 less than last index!)
+ * @param start - starting address
+ * @param stor_size - size of structure to search
+ * @return index of non-empty cell or -1
+ */
+static int binarySearch(int r, const uint8_t *start, int stor_size){
+    int l = 0;
+    while(r >= l){
+        int mid = l + (r - l) / 2;
+        const uint8_t *s = start + mid * stor_size;
+        if(*((const uint16_t*)s) == stor_size){
+            if(*((const uint16_t*)(s + stor_size)) == 0xffff){ // next is free
+                return mid;
+            }else{ // element is to the right
+                l = mid + 1;
+            }
+        }else{ // element is to the left
+            r = mid - 1;
+        }
+    }
+    return -1; // not found
+}
+
+/**
+ * @brief flashstorage_init - initialization of user conf storage
+ * run in once @ start
+ */
+void flashstorage_init(){
+    if(FLASH_SIZE > 0 && FLASH_SIZE < 20000){
+        uint32_t flsz = FLASH_SIZE * blocksize; // size in bytes
+        flsz -= (uint32_t)(&__varsstart) - FLASH_BASE;
+        maxCnum = flsz / sizeof(user_conf);
+    }
+    // -1 if there's no data at all & flash is clear; maxnum-1 if flash is full
+    currentconfidx = binarySearch((int)maxCnum-2, (const uint8_t*)Flash_Data, sizeof(user_conf));
+    if(currentconfidx > -1){
+        memcpy(&the_conf, &Flash_Data[currentconfidx], sizeof(user_conf));
+    }
+}
+
+// store new configuration
+// @return 0 if all OK
+int store_userconf(){
+    // maxnum - 3 means that there always should be at least one empty record after last data
+    // for binarySearch() checking that there's nothing more after it!
+    if(currentconfidx > (int)maxCnum - 3){ // there's no more place
+        currentconfidx = 0;
+        if(erase_flash(Flash_Data, NULL)) return 1;
+    }else ++currentconfidx; // take next data position (0 - within first run after firmware flashing)
+    return write2flash((const void*)&Flash_Data[currentconfidx], &the_conf, sizeof(the_conf));
+}
+
+static int write2flash(const void *start, const void *wrdata, uint32_t stor_size){
+    int ret = 0;
+    if (FLASH->CR & FLASH_CR_LOCK){ // unloch flash
+        FLASH->KEYR = FLASH_KEY1;
+        FLASH->KEYR = FLASH_KEY2;
+    }
+    // FLASH_SR_BSY2 for some
+    uint32_t count = (stor_size + 7) / 8;
+    volatile uint32_t *address = (volatile uint32_t*) start;
+    const uint32_t *data = (const uint32_t*) wrdata;
+    for(uint32_t i = 0; i < count; ++i){
+        while (FLASH->SR & (FLASH_SR_BSY1)); // 1: check BSY1
+        if(FLASH->SR & FLASH_SR_WRPERR){ // 2: check errors
+            return 1; // write protection
+        }
+        FLASH->SR = 0xffff; // clear all flags
+        FLASH->CR |= FLASH_CR_PG; // 3: set PG bit
+        IWDG->KR = IWDG_REFRESH;
+        *address++ = *data++; // 4: write both 32 bit words
+        *address++ = *data++;
+        while(FLASH->SR & FLASH_SR_BSY1);
+        if(FLASH->SR &  FLASH_SR_PGSERR){
+            ret = 1; // program error - meet not 0xffff
+            break;
+        }/*else{
+            for(int _ = 0; _ < 9999 && (!(FLASH->SR & FLASH_SR_EOP)); ++_);
+        }*/
+        FLASH->SR = 0xffff;
+    }
+    FLASH->CR &= ~(FLASH_CR_PG); // 7: clear PG bit at end of process
+    FLASH->CR |= FLASH_CR_LOCK; // lock it back
+    return ret;
+}
+
+/**
+ * @brief erase_flash - erase N pages of flash memory
+ * @param start  - first address
+ * @param end    - last address (or NULL if need to erase all flash remaining)
+ * @return 0 if succeed
+ */
+static int erase_flash(const void *start, const void *end){
+    int ret = 0;
+    if(!start) return 1;
+    uint32_t startb = (((uint32_t)start - FLASH_BASE) + blocksize - 1) / blocksize, endb;
+    if(!end){ // erase all remaining
+        endb = FLASH_SIZE / blocksize;
+    }else{ // erase a part
+        endb = (((uint32_t)end - FLASH_BASE) + blocksize - 1) / blocksize;
+    }
+    if ((FLASH->CR & FLASH_CR_LOCK) != 0){
+        FLASH->KEYR = FLASH_KEY1;
+        FLASH->KEYR = FLASH_KEY2;
+    }
+    for(uint32_t i = startb; i < endb; ++i){
+        IWDG->KR = IWDG_REFRESH;
+        /* (1) Wait till no operation is on going */
+        /* (2) Clear error & EOP bits */
+        while ((FLASH->SR & FLASH_SR_BSY1) != 0){} /* (1) */
+        FLASH->SR = 0xffff;  /* (2) */
+        /* (1) Set the PER bit in the FLASH_CR register to enable page erasing */
+        /* (2) Select the page to erase (PNB) */
+        /* (3) Set the STRT bit in the FLASH_CR register to start the erasing */
+        /* (4) Wait until BSY1 cleared */
+        FLASH->CR |= FLASH_CR_PER | i << FLASH_CR_PNB_Pos; /* (1) (2) */
+        FLASH->CR |= FLASH_CR_STRT; /* (3) */
+        while ((FLASH->SR & FLASH_SR_BSY1) != 0){} /* (4) */
+        FLASH->SR = FLASH_SR_EOP;
+        if(FLASH->SR & FLASH_SR_WRPERR){ /* Check Write protection error */
+            ret = 1;
+            FLASH->SR = FLASH_SR_WRPERR; /* Clear the flag by software by writing it at 1*/
+            break;
+        }
+        FLASH->CR &= ~FLASH_CR_PER; // clear PER
+    }
+    return ret;
+}
+
+void dump_userconf(){
+    SEND("flashsize="); printu(FLASH_SIZE);
+    SEND("\nuserconf_addr="); printuhex((uint32_t)Flash_Data);
+    SEND("\nuserconf_idx="); usart3_sendstr(i2str(currentconfidx));
+    SEND("\nuserconf_sz="); printu(the_conf.userconf_sz);
+    SEND("\nflagU16="); printuhex(the_conf.flagU16);
+    SEND("\nflagU32="); printuhex(the_conf.flagU32);
+    SEND("\nstr="); SEND(the_conf.str);
+    newline();
+    usart3_sendbuf();
+}
+
+int erase_storage(){
+    return erase_flash(Flash_Data, NULL);
+}
--- a/G0:G070,G0B1/flash/flash.cflags
+++ b/G0:G070,G0B1/flash/flash.cflags
@@ -0,0 +1 @@
+-std=c17
--- a/G0:G070,G0B1/flash/flash.config
+++ b/G0:G070,G0B1/flash/flash.config
@@ -0,0 +1,3 @@
+#define EBUG
+#define STM32G0
+#define STM32G070xx
--- a/G0:G070,G0B1/flash/flash.creator
+++ b/G0:G070,G0B1/flash/flash.creator
@@ -0,0 +1 @@
+[General]
--- a/G0:G070,G0B1/flash/flash.creator.user
+++ b/G0:G070,G0B1/flash/flash.creator.user
@@ -0,0 +1,171 @@
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--- a/G0:G070,G0B1/flash/flash.cxxflags
+++ b/G0:G070,G0B1/flash/flash.cxxflags
@@ -0,0 +1 @@
+-std=c++17
--- a/G0:G070,G0B1/flash/flash.files
+++ b/G0:G070,G0B1/flash/flash.files
@@ -0,0 +1,8 @@
+main.c
+usart.c
+
+flash.c
+flash.h
+strfunc.c
+strfunc.h
+usart.h
--- a/G0:G070,G0B1/flash/flash.h
+++ b/G0:G070,G0B1/flash/flash.h
@@ -0,0 +1,38 @@
+/*
+ * This file is part of the flash project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+/*
+ * struct to save user configurations
+ */
+typedef struct __attribute__((packed, aligned(8))){
+    uint16_t userconf_sz;           // "magick number"
+    uint16_t flagU16;
+    uint32_t flagU32;
+    char str[32];
+} user_conf;
+
+extern user_conf the_conf; // global user config (read from FLASH to RAM)
+// data from ld-file: start address of storage
+
+void flashstorage_init();
+int store_userconf();
+void dump_userconf();
+int erase_storage();
+
--- a/G0:G070,G0B1/flash/flash.includes
+++ b/G0:G070,G0B1/flash/flash.includes
@@ -0,0 +1,4 @@
+.
+../inc
+../inc/Fx
+../inc/cm
--- a/G0:G070,G0B1/flash/main.c
+++ b/G0:G070,G0B1/flash/main.c
@@ -0,0 +1,122 @@
+/*
+ * This file is part of the usart project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stm32g0.h>
+#include "flash.h"
+#include "strfunc.h"
+#include "usart.h"
+
+// KEY (intpullup->0) - PC0
+// LED - PC8
+
+volatile uint32_t Tms = 0;
+
+/* Called when systick fires */
+void sys_tick_handler(void){
+    ++Tms;
+}
+
+static void gpio_setup(void){
+    RCC->IOPENR |= RCC_IOPENR_GPIOCEN; // enable PC
+    // set PC8 as opendrain output, PC0 is pullup input, other as default (AIN)
+    GPIOC->MODER = (0xffffffff & ~(GPIO_MODER_MODE8 | GPIO_MODER_MODE0)) | GPIO_MODER_MODER8_O;
+    GPIOC->PUPDR = GPIO_PUPDR0_PU; // pullup
+    GPIOC->OTYPER = GPIO_OTYPER_OT8; // open drain
+}
+
+static const char *helpmsg =
+        "'1' - change U16 value\n"
+        "'2' - change U32 value\n"
+        "'d' - dumpconf\n"
+        "'e' - erase flash\n"
+        "'f' - save conf to flash\n"
+        "'s' - change string (up to 31 symbol)\n"
+        "'t' - print Tms\n"
+;
+
+static void chstr(const char *s){
+    int i = 0;
+    for(; i < 31 && *s; ++i){
+        the_conf.str[i] = *s++;
+    }
+    the_conf.str[i] = 0;
+}
+
+int main(void){
+    StartHSE();
+    SysTick_Config(8000); // 1ms counter
+    flashstorage_init();
+    gpio_setup();
+    usart3_setup();
+    uint32_t T = 0;
+    int sent = 0;
+    /* Do nothing in main loop */
+    while (1){
+        if(Tms - T > 499){ // blink LED
+            T = Tms;
+            pin_toggle(GPIOC, 1<<8);
+            usart3_sendbuf();
+        }
+        if(pin_read(GPIOC, 1<<0) == 0){ // key pressed - send data over USART
+            if(!sent){
+                usart3_sendstr("Button pressed\n");
+                sent = 1;
+            }
+        }else sent = 0;
+        int wasbo = 0;
+        char *rcv = usart3_getline(&wasbo);
+        if(wasbo) usart3_sendstr("Buffer overflow occured @ last message\n");
+        if(rcv){
+            char cmd = *rcv++;
+            uint32_t U, got = 0;
+            const char *n = getnum(rcv, &U);
+            if(n != rcv) got = 1;
+            switch(cmd){
+                case '1':
+                    if(!got || U > 0xffff) SEND("Need an uint16_t number\n");
+                    else the_conf.flagU16 = (uint16_t)U;
+                    SEND("Changed to "); printuhex(the_conf.flagU16); newline();
+                break;
+                case '2':
+                    if(!got) SEND("Need an uint32_t number\n");
+                    else the_conf.flagU32 = U;
+                    SEND("Changed to "); printuhex(the_conf.flagU32); newline();
+                break;
+                case 'd':
+                    dump_userconf();
+                break;
+                case 'e':
+                    if(erase_storage()) SEND("Error erasing\n");
+                    else SEND("Erased OK\n");
+                break;
+                case 'f':
+                    if(store_userconf()) SEND("Error: can't save\n");
+                    else SEND("OK, stored\n");
+                break;
+                case 's':
+                    chstr(omit_spaces(rcv));
+                    SEND("Changed to: "); SEND(the_conf.str); newline();
+                break;
+                case 't':
+                    SEND("Tms="); printu(Tms); newline();
+                break;
+                default: SEND(helpmsg);
+            }
+        }
+    }
+}
--- a/G0:G070,G0B1/flash/openocd.cfg
+++ b/G0:G070,G0B1/flash/openocd.cfg
@@ -0,0 +1,89 @@
+# script for stm32g0x family
+
+#
+# stm32g0 devices support SWD transports only.
+#
+source [find interface/stlink.cfg]
+source [find target/swj-dp.tcl]
+source [find mem_helper.tcl]
+
+if { [info exists CHIPNAME] } {
+	set _CHIPNAME $CHIPNAME
+} else {
+	set _CHIPNAME stm32g0x
+}
+
+set _ENDIAN little
+
+# Work-area is a space in RAM used for flash programming
+# Smallest proposed target has 8kB ram, use 4kB by default to avoid surprises
+if { [info exists WORKAREASIZE] } {
+	set _WORKAREASIZE $WORKAREASIZE
+} else {
+	set _WORKAREASIZE 0x1000
+}
+
+#jtag scan chain
+if { [info exists CPUTAPID] } {
+	set _CPUTAPID $CPUTAPID
+} else {
+	# Section 37.5.5 - corresponds to Cortex-M0+
+	set _CPUTAPID 0x0bc11477
+}
+
+swj_newdap $_CHIPNAME cpu -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_CPUTAPID
+dap create $_CHIPNAME.dap -chain-position $_CHIPNAME.cpu
+
+set _TARGETNAME $_CHIPNAME.cpu
+target create $_TARGETNAME cortex_m -endian $_ENDIAN -dap $_CHIPNAME.dap
+
+$_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size $_WORKAREASIZE -work-area-backup 0
+
+set _FLASHNAME $_CHIPNAME.flash
+flash bank $_FLASHNAME stm32l4x 0 0 0 0 $_TARGETNAME
+
+# reasonable default
+adapter speed 2000
+
+adapter srst delay 100
+if {[using_jtag]} {
+	jtag_ntrst_delay 100
+}
+
+reset_config srst_nogate
+
+if {![using_hla]} {
+	# if srst is not fitted use SYSRESETREQ to
+	# perform a soft reset
+	cortex_m reset_config sysresetreq
+}
+
+proc stm32g0x_default_reset_start {} {
+	# Reset clock is HSI16 (16 MHz)
+	adapter speed 2000
+}
+
+proc stm32g0x_default_examine_end {} {
+	# DBGMCU_CR |= DBG_STANDBY | DBG_STOP
+	mmw 0x40015804 0x00000006 0
+
+	# Stop watchdog counters during halt
+	# DBGMCU_APB1_FZ |= DBG_IWDG_STOP | DBG_WWDG_STOP
+	mmw 0x40015808 0x00001800 0
+}
+
+proc stm32g0x_default_reset_init {} {
+	# Increase clock to 64 Mhz
+	mmw 0x40022000 0x00000002 0x00000005	;# FLASH_ACR: Latency = 2
+	mww 0x4002100C 0x30000802				;# RCC_PLLCFGR = PLLR=/2, PLLN=8, PLLM=/1, PLLSRC=0x2
+	mmw 0x40021000 0x01000000 0x00000000	;# RCC_CR |= PLLON
+	mmw 0x40021008 0x00000002 0x00000005	;# RCC_CFGR: SW=PLLRCLK
+
+	# Boost JTAG frequency
+	adapter speed 4000
+}
+
+# Default hooks
+$_TARGETNAME configure -event examine-end { stm32g0x_default_examine_end }
+$_TARGETNAME configure -event reset-start { stm32g0x_default_reset_start }
+$_TARGETNAME configure -event reset-init { stm32g0x_default_reset_init }
--- a/G0:G070,G0B1/flash/strfunc.c
+++ b/G0:G070,G0B1/flash/strfunc.c
@@ -0,0 +1,269 @@
+/*
+ * This file is part of the flash project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stm32g0.h>
+#include <string.h>
+
+/**
+ * @brief hexdump - dump hex array by 16 bytes in string
+ * @param sendfun - function to send data
+ * @param arr - array to dump
+ * @param len - length of `arr`
+ */
+void hexdump(int (*sendfun)(const char *s), uint8_t *arr, uint16_t len){
+    char buf[52], *bptr = buf;
+    for(uint16_t l = 0; l < len; ++l, ++arr){
+        for(int16_t j = 1; j > -1; --j){
+            register uint8_t half = (*arr >> (4*j)) & 0x0f;
+            if(half < 10) *bptr++ = half + '0';
+            else *bptr++ = half - 10 + 'a';
+        }
+        if(l % 16 == 15){
+            *bptr++ = '\n';
+            *bptr = 0;
+            sendfun(buf);
+            bptr = buf;
+        }else *bptr++ = ' ';
+    }
+    if(bptr != buf){
+        *bptr++ = '\n';
+        *bptr = 0;
+        sendfun(buf);
+    }
+}
+
+/**
+ * @brief _2str - convert value into string buffer
+ * @param val - |value|
+ * @param minus - ==0 if value > 0
+ * @return buffer with number
+ */
+static char *_2str(uint32_t  val, uint8_t minus){
+    static char strbuf[12];
+    char *bufptr = &strbuf[11];
+    *bufptr = 0;
+    if(!val){
+        *(--bufptr) = '0';
+    }else{
+        while(val){
+            uint32_t x = val / 10;
+            *(--bufptr) = (val - 10*x) + '0';
+            val = x;
+            //*(--bufptr) = val % 10 + '0';
+            //val /= 10;
+        }
+    }
+    if(minus) *(--bufptr) = '-';
+    return bufptr;
+}
+
+// return string with number `val`
+char *u2str(uint32_t val){
+    return _2str(val, 0);
+}
+char *i2str(int32_t i){
+    uint8_t minus = 0;
+    uint32_t val;
+    if(i < 0){
+        minus = 1;
+        val = -i;
+    }else val = i;
+    return _2str(val, minus);
+}
+
+/**
+ * @brief uhex2str - print 32bit unsigned int as hex
+ * @param val - value
+ * @return string with number
+ */
+char *uhex2str(uint32_t val){
+    static char buf[12] = "0x";
+    int npos = 2;
+    uint8_t *ptr = (uint8_t*)&val + 3;
+    int8_t i, j, z=1;
+    for(i = 0; i < 4; ++i, --ptr){
+        if(*ptr == 0){ // omit leading zeros
+            if(i == 3) z = 0;
+            if(z) continue;
+        }
+        else z = 0;
+        for(j = 1; j > -1; --j){
+            uint8_t half = (*ptr >> (4*j)) & 0x0f;
+            if(half < 10) buf[npos++] = half + '0';
+            else buf[npos++] = half - 10 + 'a';
+        }
+    }
+    buf[npos] = 0;
+    return buf;
+}
+
+/**
+ * @brief omit_spaces - eliminate leading spaces and other trash in string
+ * @param buf - string
+ * @return - pointer to first character in `buf` > ' '
+ */
+const char *omit_spaces(const char *buf){
+    while(*buf){
+        if(*buf > ' ') break;
+        ++buf;
+    }
+    return buf;
+}
+
+/**
+ * @brief getdec - read decimal number & return pointer to next non-number symbol
+ * @param buf - string
+ * @param N - number read
+ * @return Next non-number symbol. In case of overflow return `buf` and N==0xffffffff
+ */
+static const char *getdec(const char *buf, uint32_t *N){
+    char *start = (char*)buf;
+    uint32_t num = 0;
+    while(*buf){
+        char c = *buf;
+        if(c < '0' || c > '9'){
+            break;
+        }
+        if(num > 429496729 || (num == 429496729 && c > '5')){ // overflow
+            *N = 0xffffff;
+            return start;
+        }
+        num *= 10;
+        num += c - '0';
+        ++buf;
+    }
+    *N = num;
+    return buf;
+}
+// read hexadecimal number (without 0x prefix!)
+static const char *gethex(const char *buf, uint32_t *N){
+    const char *start = buf;
+    uint32_t num = 0;
+    while(*buf){
+        char c = *buf;
+        uint8_t M = 0;
+        if(c >= '0' && c <= '9'){
+            M = '0';
+        }else if(c >= 'A' && c <= 'F'){
+            M = 'A' - 10;
+        }else if(c >= 'a' && c <= 'f'){
+            M = 'a' - 10;
+        }
+        if(M){
+            if(num & 0xf0000000){ // overflow
+                *N = 0xffffff;
+                return start;
+            }
+            num <<= 4;
+            num += c - M;
+        }else{
+            break;
+        }
+        ++buf;
+    }
+    *N = num;
+    return buf;
+}
+// read octal number (without 0 prefix!)
+static const char *getoct(const char *buf, uint32_t *N){
+    const char *start = (char*)buf;
+    uint32_t num = 0;
+    while(*buf){
+        char c = *buf;
+        if(c < '0' || c > '7'){
+            break;
+        }
+        if(num & 0xe0000000){ // overflow
+            *N = 0xffffff;
+            return start;
+        }
+        num <<= 3;
+        num += c - '0';
+        ++buf;
+    }
+    *N = num;
+    return buf;
+}
+// read binary number (without b prefix!)
+static const char *getbin(const char *buf, uint32_t *N){
+    const char *start = (char*)buf;
+    uint32_t num = 0;
+    while(*buf){
+        char c = *buf;
+        if(c < '0' || c > '1'){
+            break;
+        }
+        if(num & 0x80000000){ // overflow
+            *N = 0xffffff;
+            return start;
+        }
+        num <<= 1;
+        if(c == '1') num |= 1;
+        ++buf;
+    }
+    *N = num;
+    return buf;
+}
+
+/**
+ * @brief getnum - read uint32_t from string (dec, hex or bin: 127, 0x7f, 0b1111111)
+ * @param buf - buffer with number and so on
+ * @param N   - the number read
+ * @return pointer to first non-number symbol in buf
+ *      (if it is == buf, there's no number or if *N==0xffffffff there was overflow)
+ */
+const char *getnum(const char *txt, uint32_t *N){
+    const char *nxt = NULL;
+    const char *s = omit_spaces(txt);
+    if(*s == '0'){ // hex, oct or 0
+        if(s[1] == 'x' || s[1] == 'X'){ // hex
+            nxt = gethex(s+2, N);
+            if(nxt == s+2) nxt = (char*)txt;
+        }else if(s[1] > '0'-1 && s[1] < '8'){ // oct
+            nxt = getoct(s+1, N);
+            if(nxt == s+1) nxt = (char*)txt;
+        }else{ // 0
+            nxt = s+1;
+            *N = 0;
+        }
+    }else if(*s == 'b' || *s == 'B'){
+        nxt = getbin(s+1, N);
+        if(nxt == s+1) nxt = (char*)txt;
+    }else{
+        nxt = getdec(s, N);
+        if(nxt == s) nxt = (char*)txt;
+    }
+    return nxt;
+}
+
+// get signed integer
+const char *getint(const char *txt, int32_t *I){
+    const char *s = omit_spaces(txt);
+    int32_t sign = 1;
+    uint32_t U;
+    if(*s == '-'){
+    	sign = -1;
+    	++s;
+    }
+    const char *nxt = getnum(s, &U);
+    if(nxt == s) return txt;
+    if(U & 0x80000000) return txt; // overfull
+    *I = sign * (int32_t)U;
+    return nxt;
+}
+
--- a/G0:G070,G0B1/flash/strfunc.h
+++ b/G0:G070,G0B1/flash/strfunc.h
@@ -0,0 +1,30 @@
+/*
+ * This file is part of the flash project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <string.h>
+
+void hexdump(int (*sendfun)(const char *s), uint8_t *arr, uint16_t len);
+char *u2str(uint32_t val);
+char *i2str(int32_t i);
+char *uhex2str(uint32_t val);
+const char *getnum(const char *txt, uint32_t *N);
+const char *omit_spaces(const char *buf);
+const char *getint(const char *txt, int32_t *I);
--- a/G0:G070,G0B1/flash/usart.c
+++ b/G0:G070,G0B1/flash/usart.c
@@ -0,0 +1,174 @@
+/*
+ * This file is part of the flash project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stm32g0.h>
+#include <string.h>
+
+#include "usart.h"
+
+// RX/TX DMA->CCR without EN flag
+#define DMARXCCR    (DMA_CCR_MINC | DMA_CCR_TCIE | DMA_CCR_TEIE)
+#define DMATXCCR    (DMA_CCR_MINC | DMA_CCR_DIR | DMA_CCR_TCIE | DMA_CCR_TEIE)
+
+static volatile int txrdy = 1, rxrdy = 0; // transmission done, next line received
+static volatile int bufovr = 0, wasbufovr = 0; // Rx buffer overflow or error flag -> delete next line
+static volatile int rbufno = 0, tbufno = 0; // current buf number
+static volatile char rbuf[2][UARTBUFSZ], tbuf[2][UARTBUFSZ]; // receive & transmit buffers
+static volatile int rxlen[2] = {0}, txlen[2] = {0};
+
+char *usart3_getline(int *wasbo){
+    if(wasbo) *wasbo = wasbufovr;
+    wasbufovr = 0;
+    if(!rxrdy) return NULL;
+    rxrdy = 0; // clear ready flag
+    return (char*)rbuf[!rbufno]; // current buffer is in filling stage, return old - filled - buffer
+}
+
+#define USART_BRR(speed)    ((64000000 + speed/2) / speed)
+
+// USART3 @ PD8 (Tx) and PD9 (Rx) - both AF0
+void usart3_setup(){
+    RCC->IOPENR |= RCC_IOPENR_GPIODEN; // enable PD
+    RCC->AHBENR |= RCC_AHBENR_DMA1EN; // enable DMA1
+    // set PD8 and PD9 as AF
+    GPIOD->MODER = (GPIOD->MODER & ~(GPIO_MODER_MODE8 | GPIO_MODER_MODE9))
+            | GPIO_MODER_MODER8_AF | GPIO_MODER_MODER9_AF;
+    // AF0 for USART3 @ PD8/PD9
+    GPIOD->AFR[1] = GPIOD->AFR[1] & ~(GPIO_AFRH_AFSEL8 | GPIO_AFRH_AFSEL9);
+    // enable USART3 clocking
+    RCC->APBENR1 |= RCC_APBENR1_USART3EN;
+    // baudrate 115200
+    USART3->BRR = USART_BRR(115200);
+    // eol character: '/n'
+    USART3->CR2 = USART_CR2_ADD_VAL('\n');
+    // enable DMA transmission
+    USART3->CR3 = USART_CR3_DMAT | USART_CR3_DMAR;
+    // set up DMA channels: 2 - Tx, 3 - Rx
+    // Tx channel: mem++, mem->periph, 8bit, compl.&err. irq
+    DMA1_Channel2->CCR = DMATXCCR;
+    DMA1_Channel2->CPAR = (uint32_t) &USART3->TDR; // peripherial address
+    // Rx channel: mem++, periph->mem, 8bit, compl.&err. irq
+    DMA1_Channel3->CCR = DMARXCCR;
+    DMA1_Channel3->CPAR = (uint32_t) &USART3->RDR; // peripherial address
+    DMA1_Channel3->CNDTR = UARTBUFSZ;
+    DMA1_Channel3->CMAR = (uint32_t)&rbuf[rbufno];
+    // set up DMAMUX channels: 55 - USART3_TX, 54 - USART3_RX
+    // enumeration of DMAMUX starts from 0 (DMA - from 1)!
+    DMAMUX1_Channel1->CCR = 55;
+    DMAMUX1_Channel2->CCR = 54;
+    // charmatch interrupt, enable transmitter and receiver, enable usart
+    USART3->CR1 = USART_CR1_CMIE | USART_CR1_TE | USART_CR1_RE | USART_CR1_UE;
+    USART3->ICR = 0xffffffff; // clear all flags
+    DMA1_Channel3->CCR = DMARXCCR | DMA_CCR_EN; // start receiving right now
+    NVIC_EnableIRQ(USART3_4_IRQn);
+    NVIC_EnableIRQ(DMA1_Channel2_3_IRQn);
+}
+
+static void mymemcpy(char *dest, const char *src, int len){
+    while(len--) *dest++ = *src++;
+}
+
+int usart3_send(const char *str, int len){
+    int rest = UARTBUFSZ - txlen[tbufno];
+    if(rest == 0 && !txrdy) return 0; // buffer is full while transmission in process
+    if(len < rest) rest = len;
+    mymemcpy((char*)(tbuf[tbufno] + txlen[tbufno]), str, rest);
+    txlen[tbufno] += rest;
+    if(!txrdy) return rest;
+    if(txlen[tbufno] == UARTBUFSZ) usart3_sendbuf();
+    if(rest == len) return len;
+    len -= rest;
+    // now fill another - empty - buffer
+    if(len > UARTBUFSZ) len = UARTBUFSZ;
+    mymemcpy((char*)tbuf[tbufno], str + rest, len);
+    txlen[tbufno] = len;
+    return rest + len;
+}
+
+int usart3_sendstr(const char *str){
+    int l = strlen(str);
+    return usart3_send(str, l);
+}
+
+/**
+ * @brief usart3_sendbuf - send current buffer
+ */
+void usart3_sendbuf(){
+    if(!txrdy || txlen[tbufno] == 0) return;
+    // set up DMA
+    DMA1_Channel2->CCR = DMATXCCR;
+    DMA1_Channel2->CMAR = (uint32_t)&tbuf[tbufno];
+    DMA1_Channel2->CNDTR = txlen[tbufno];
+    USART3->ICR = USART_ICR_TCCF; // clear TC flag
+    txrdy = 0;
+    // activate DMA
+    DMA1_Channel2->CCR = DMATXCCR | DMA_CCR_EN;
+    tbufno = !tbufno; // swap buffers
+    txlen[tbufno] = 0;
+}
+
+// return amount of bytes sents
+int usart3_send_blocking(const char *str, int len){
+    if(!txrdy) return 0;
+    USART3->CR1 |= USART_CR1_TE;
+    for(int i = 0; i < len; ++i){
+        while(!(USART3->ISR & USART_ISR_TXE_TXFNF));
+        USART3->TDR = *str++;
+    }
+    return len;
+}
+
+// interrupt by '\n'
+void usart3_4_isr(){
+    if(USART3->ISR & USART_ISR_CMF){ // got '\n' @ USART3
+        DMA1_Channel3->CCR = DMARXCCR;
+        if(!bufovr){ // forget about broken line @ buffer overflow
+            rxrdy = 1;
+            int l = UARTBUFSZ - DMA1_Channel3->CNDTR - 1; // strlen
+            rxlen[rbufno] = l;
+            rbuf[rbufno][l] = 0;
+            rbufno = !rbufno;
+        }else{
+            bufovr = 0;
+            wasbufovr = 1;
+        }
+        // reload DMA Rx with next buffer
+        DMA1_Channel3->CMAR = (uint32_t)&rbuf[rbufno];
+        DMA1_Channel3->CNDTR = UARTBUFSZ;
+        DMA1_Channel3->CCR = DMARXCCR | DMA_CCR_EN;
+    }
+    USART3->ICR = 0xffffffff; // clear all flags
+}
+
+// ch2 - Tx, ch3 - Rx
+void dma1_channel2_3_isr(){
+    uint32_t isr = DMA1->ISR;
+    if(isr & (DMA_ISR_TCIF2 | DMA_ISR_TEIF2)){ // transfer complete or error
+        txrdy = 1;
+        //DMA1_Channel2->CCR = DMATXCCR;
+    }
+    if(isr & (DMA_ISR_TCIF3 | DMA_ISR_TEIF3)){ // receive complete or error -> buffer overflow
+        if(rbuf[rbufno][UARTBUFSZ-1] != '\n'){ // last symbol is not a newline
+            bufovr = 1;
+            DMA1_Channel3->CCR = DMARXCCR;
+            DMA1_Channel3->CNDTR = UARTBUFSZ;
+            DMA1_Channel3->CCR = DMARXCCR | DMA_CCR_EN;
+        }
+    }
+    DMA1->IFCR = 0xffffffff; // clear all flags
+}
--- a/G0:G070,G0B1/flash/usart.h
+++ b/G0:G070,G0B1/flash/usart.h
@@ -0,0 +1,35 @@
+/*
+ * This file is part of the flash project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "strfunc.h"
+
+#define UARTBUFSZ   (512)
+
+#define SEND(x)     do{usart3_sendstr(x);}while(0)
+#define newline()   do{usart3_sendstr("\n");}while(0)
+#define printu(x)       do{usart3_sendstr(u2str(x));}while(0)
+#define printuhex(x)    do{usart3_sendstr(uhex2str(x));}while(0)
+
+void usart3_setup();
+int usart3_send_blocking(const char *str, int len);
+int usart3_send(const char *str, int len);
+void usart3_sendbuf();
+char *usart3_getline(int *wasbo);
+int usart3_sendstr(const char *str);
--- a/G0:G070,G0B1/g0b1/Makefile
+++ b/G0:G070,G0B1/g0b1/Makefile
@@ -0,0 +1,9 @@
+BINARY      := test
+# MCU code
+MCU         := G0B1xx
+# change this linking script depending on particular MCU model,
+LDSCRIPT    := stm32g0b1xb.ld
+
+include ../makefile.g0
+include ../../makefile.stm32
+
--- a/G0:G070,G0B1/g0b1/README
+++ b/G0:G070,G0B1/g0b1/README
@@ -0,0 +1,3 @@
+Toggle LED on STM32G0B1-pill depending on user button:
+- pressed - 'SOS' in Morze
+- not pressed - blink with period of 1 second
--- a/G0:G070,G0B1/g0b1/main.c
+++ b/G0:G070,G0B1/g0b1/main.c
@@ -0,0 +1,86 @@
+/*
+ * This file is part of the blink project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "stm32g0.h"
+
+#define KEY_PORT        GPIOC
+#define KEY_PIN         (1<<13)
+#define LED_PORT        GPIOC
+#define LED_PIN         (1<<6)
+#define KEY_PRESSED()   (pin_read(KEY_PORT, KEY_PIN) == 1)
+#define LED_ON()        do{pin_set(LED_PORT, LED_PIN);}while(0)
+#define LED_OFF()       do{pin_clear(LED_PORT, LED_PIN);}while(0)
+
+// KEY (intpullup->0) - PC13
+// LED - PC6
+
+static volatile uint32_t blink_ctr = 0;
+
+/* Called when systick fires */
+void sys_tick_handler(void){
+    ++blink_ctr;
+}
+
+/*
+ * Set up timer to fire every x milliseconds
+ */
+static void systick_setup(uint32_t xms){ // xms < 2098!!!
+    blink_ctr = 0;
+    static uint32_t curms = 0;
+    if(curms == xms) return;
+    // 8MHz - HCLK/8
+    // this function also clears counter so it starts right away
+    SysTick_Config(8000 * xms); // arg should be < 0xffffff, so ms should be < 2098
+    curms = xms;
+}
+
+static void gpio_setup(void){
+    RCC->IOPENR = RCC_IOPENR_GPIOCEN; // enable PC
+    // set PC8 as opendrain output, PC0 is pullup input, other as default (AIN)
+    GPIOC->MODER = (0xffffffff & ~(GPIO_MODER_MODE6 | GPIO_MODER_MODE13)) | GPIO_MODER_MODER6_O; // GPIO_MODER_MODER13_I == 0
+    GPIOC->PUPDR = GPIO_PUPDR13_PD; // pull down
+}
+
+static const uint32_t L[] = {125,100,125,100,125,200, 350,100,350,100,350,200, 125,100,125,100,125, 1000};
+
+int main(void){
+    StartHSE();
+    gpio_setup();
+    systick_setup(500);
+    uint32_t M = 0;
+    int pressed = 0;
+    /* Do nothing in main loop */
+    while (1){
+        if(KEY_PRESSED()){ // key pressed - 'sos'
+            pressed = 1;
+            systick_setup(L[M]);
+            if(M & 1) LED_OFF();
+            else LED_ON();
+            if(++M == 18) M = 0;
+            while(blink_ctr == 0);
+        }else{ // key not pressed - blink with period of 1s
+            if(pressed){
+                M = 0;
+                pressed = 0;
+                systick_setup(500);
+            }
+            if(blink_ctr & 1) LED_ON();
+            else LED_OFF();
+        }
+    }
+}
--- a/G0:G070,G0B1/g0b1/openocd.cfg
+++ b/G0:G070,G0B1/g0b1/openocd.cfg
@@ -0,0 +1,4 @@
+set FLASH_SIZE 0x20000
+
+source [find interface/stlink-v2-1.cfg]
+source [find target/stm32g0x.cfg]
--- a/G0:G070,G0B1/g0b1/test.bin
+++ b/G0:G070,G0B1/g0b1/test.bin
--- a/G0:G070,G0B1/g0b1/test.cflags
+++ b/G0:G070,G0B1/g0b1/test.cflags
@@ -0,0 +1 @@
+-std=c17
--- a/G0:G070,G0B1/g0b1/test.config
+++ b/G0:G070,G0B1/g0b1/test.config
@@ -0,0 +1,3 @@
+#define EBUG
+#define STM32G0
+#define STM32G0B1xx
--- a/G0:G070,G0B1/g0b1/test.creator
+++ b/G0:G070,G0B1/g0b1/test.creator
@@ -0,0 +1 @@
+[General]
--- a/G0:G070,G0B1/g0b1/test.creator.user
+++ b/G0:G070,G0B1/g0b1/test.creator.user
@@ -0,0 +1,214 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE QtCreatorProject>
+<!-- Written by QtCreator 18.0.2, 2026-03-01T23:07:02. -->
+<qtcreator>
+ <data>
+  <variable>EnvironmentId</variable>
+  <value type="QByteArray">{7bd84e39-ca37-46d3-be9d-99ebea85bc0d}</value>
+ </data>
+ <data>
+  <variable>ProjectExplorer.Project.ActiveTarget</variable>
+  <value type="qlonglong">0</value>
+ </data>
+ <data>
+  <variable>ProjectExplorer.Project.EditorSettings</variable>
+  <valuemap type="QVariantMap">
+   <value type="bool" key="EditorConfiguration.AutoDetect">true</value>
+   <value type="bool" key="EditorConfiguration.AutoIndent">true</value>
+   <value type="bool" key="EditorConfiguration.CamelCaseNavigation">true</value>
+   <valuemap type="QVariantMap" key="EditorConfiguration.CodeStyle.0">
+    <value type="QString" key="language">Cpp</value>
+    <valuemap type="QVariantMap" key="value">
+     <value type="QByteArray" key="CurrentPreferences">CppGlobal</value>
+    </valuemap>
+   </valuemap>
+   <valuemap type="QVariantMap" key="EditorConfiguration.CodeStyle.1">
+    <value type="QString" key="language">QmlJS</value>
+    <valuemap type="QVariantMap" key="value">
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+     <value type="bool" key="Analyzer.Valgrind.Settings.UseGlobalSettings">true</value>
+     <valuelist type="QVariantList" key="CustomOutputParsers"/>
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+    <value type="QString" key="ProjectExplorer.RunConfiguration.BuildKey"></value>
+    <value type="bool" key="ProjectExplorer.RunConfiguration.Customized">false</value>
+    <value type="QString" key="ProjectExplorer.RunConfiguration.UniqueId"></value>
+    <value type="bool" key="RunConfiguration.UseCppDebuggerAuto">true</value>
+    <value type="bool" key="RunConfiguration.UseQmlDebuggerAuto">true</value>
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+  <value type="qlonglong">1</value>
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+  <value type="int">22</value>
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--- a/G0:G070,G0B1/g0b1/test.cxxflags
+++ b/G0:G070,G0B1/g0b1/test.cxxflags
@@ -0,0 +1 @@
+-std=c++17
--- a/G0:G070,G0B1/g0b1/test.files
+++ b/G0:G070,G0B1/g0b1/test.files
@@ -0,0 +1,2 @@
+main.c
+systick_blink.c
--- a/G0:G070,G0B1/g0b1/test.includes
+++ b/G0:G070,G0B1/g0b1/test.includes
@@ -0,0 +1,4 @@
+.
+../inc
+../inc/Fx
+../inc/cm
--- a/G0:G070,G0B1/i2c/Makefile
+++ b/G0:G070,G0B1/i2c/Makefile
@@ -0,0 +1,9 @@
+BINARY      := rtc
+# MCU code
+MCU         := G070xx
+# change this linking script depending on particular MCU model,
+LDSCRIPT    := stm32g070xb.ld
+
+include ../makefile.g0
+include ../../makefile.stm32
+
--- a/G0:G070,G0B1/i2c/Makefile.old
+++ b/G0:G070,G0B1/i2c/Makefile.old
@@ -0,0 +1,164 @@
+BINARY		= i2cscan
+BOOTPORT	?= /dev/ttyUSB0
+BOOTSPEED	?= 115200
+# MCU FAMILY
+FAMILY		= G0
+# MCU code
+MCU			= G070xx
+#DEFS		= -DEBUG -g3
+# change this linking script depending on particular MCU model,
+# for example, if you have STM32F103VBT6, you should write:
+LDSCRIPT	= stm32g070xb.ld
+
+INDEPENDENT_HEADERS=
+
+FP_FLAGS	?= -msoft-float
+ASM_FLAGS	= -mthumb -mcpu=cortex-m0plus -march=armv6-m -mtune=cortex-m0plus
+ARCH_FLAGS	= $(ASM_FLAGS) $(FP_FLAGS)
+
+# autoincremental version & build date
+VERSION_FILE = version.inc
+ifeq ($(shell test -e $(VERSION_FILE) && echo -n yes), yes)
+    NEXTVER := $(shell expr $$(awk '/#define BUILD_NUMBER/' $(VERSION_FILE) | tr -cd "[0-9]") + 1)
+else
+    NEXTVER := "1"
+endif
+
+BUILDDATE := $(shell date +%Y-%m-%d)
+
+###############################################################################
+# Executables
+PREFIX		?= /opt/bin/arm-none-eabi
+
+RM			:= rm -f
+RMDIR		:= rmdir
+SIZE        := $(PREFIX)-size
+CC			:= $(PREFIX)-gcc
+LD			:= $(PREFIX)-gcc
+AR			:= $(PREFIX)-ar
+AS			:= $(PREFIX)-as
+OBJCOPY		:= $(PREFIX)-objcopy
+OBJDUMP		:= $(PREFIX)-objdump
+GDB			:= $(PREFIX)-gdb
+STFLASH		:= $(shell which st-flash)
+STBOOT		:= $(shell which stm32flash)
+
+###############################################################################
+# Source files
+OBJDIR 		= mk
+LDSCRIPT	?= $(BINARY).ld
+SRC			:= $(wildcard *.c)
+OBJS		:= $(addprefix $(OBJDIR)/, $(SRC:%.c=%.o))
+STARTUP		= $(OBJDIR)/startup.o
+OBJS 		+= $(STARTUP)
+DEPS		:= $(OBJS:.o=.d)
+
+INC_DIR ?= ../inc
+
+INCLUDE 	:= -I$(INC_DIR)/Fx -I$(INC_DIR)/cm
+LIB_DIR		:= $(INC_DIR)/ld
+
+###############################################################################
+# C flags
+CFLAGS		+= -O2 -MD -D__thumb2__=1
+CFLAGS		+= -Wall -Werror -Wextra -Wshadow -Wimplicit-function-declaration
+CFLAGS		+= -Wredundant-decls $(INCLUDE)
+# -Wmissing-prototypes -Wstrict-prototypes
+CFLAGS		+= -fno-common -ffunction-sections -fdata-sections -flto
+
+###############################################################################
+# Linker flags
+LDFLAGS		+= --static -nostartfiles --specs=nano.specs -flto
+LDFLAGS		+= -L$(LIB_DIR)
+LDFLAGS		+= -T$(LDSCRIPT)
+LDFLAGS		+= -Wl,-Map=$(OBJDIR)/$(BINARY).map
+LDFLAGS		+= -Wl,--gc-sections
+
+###############################################################################
+# Used libraries
+LDLIBS		+= -Wl,--start-group -lc -lgcc -Wl,--end-group
+LDLIBS		+= $(shell $(CC) $(CFLAGS) -print-libgcc-file-name)
+
+DEFS		+= -DSTM32$(FAMILY) -DSTM32$(MCU)
+
+#.SUFFIXES: .elf .bin .hex .srec .list .map .images
+#.SECONDEXPANSION:
+#.SECONDARY:
+
+ELF		:= $(OBJDIR)/$(BINARY).elf
+LIST	:= $(OBJDIR)/$(BINARY).list
+BIN		:= $(BINARY).bin
+HEX		:= $(BINARY).hex
+
+all: bin list size
+
+elf: $(ELF)
+bin: $(BIN)
+hex: $(HEX)
+list: $(LIST)
+
+ifneq ($(MAKECMDGOALS),clean)
+-include $(DEPS)
+endif
+
+$(OBJDIR):
+	mkdir $(OBJDIR)
+
+$(STARTUP): $(INC_DIR)/startup/vector.c
+	$(CC) $(CFLAGS) $(DEFS) $(INCLUDE) $(ARCH_FLAGS) -o $@ -c $<
+
+$(VERSION_FILE): *.[ch]
+	[ -f $(VERSION_FILE) ] || echo -e "#define BUILD_NUMBER \"0\"\n#define BUILD_DATE \"none\"" > $(VERSION_FILE)
+	@echo "  Generate version: $(NEXTVER) for date $(BUILDDATE)"
+	@sed -i "s/#define BUILD_NUMBER.*/#define BUILD_NUMBER \"$(NEXTVER)\"/" $(VERSION_FILE)
+	@sed -i "s/#define BUILD_DATE.*/#define BUILD_DATE \"$(BUILDDATE)\"/" $(VERSION_FILE)
+
+# Uncomment and rename file, which includes version.inc
+#$(OBJDIR)/proto.o: proto.c $(VERSION_FILE)
+
+$(OBJDIR)/%.o: %.c
+	@echo "  CC      $<"
+	$(CC) $(CFLAGS) $(DEFS) $(INCLUDE) $(ARCH_FLAGS) -o $@ -c $<
+
+#$(OBJDIR)/%.d: %.c $(OBJDIR)
+#	$(CC) -MM -MG $< | sed -e 's,^\([^:]*\)\.o[ ]*:,$(@D)/\1.o $(@D)/\1.d:,' >$@
+
+$(BIN): $(ELF)
+	@echo "  OBJCOPY $(BIN)"
+	$(OBJCOPY) -Obinary $(ELF) $(BIN)
+
+$(HEX): $(ELF)
+	@echo "  OBJCOPY $(HEX)"
+	$(OBJCOPY) -Oihex $(ELF) $(HEX)
+
+$(LIST): $(ELF)
+	@echo "  OBJDUMP $(LIST)"
+	$(OBJDUMP) -S $(ELF) > $(LIST)
+
+$(ELF): $(OBJDIR) $(OBJS)
+	@echo "  LD      $(ELF)"
+	$(LD) $(LDFLAGS) $(ARCH_FLAGS) $(OBJS) $(LDLIBS) -o $(ELF)
+
+clean:
+	@echo "  CLEAN"
+	$(RM) $(OBJS) $(DEPS) $(ELF) $(HEX) $(LIST) $(OBJDIR)/*.map
+	@rmdir $(OBJDIR) 2>/dev/null || true
+
+size: $(ELF)
+	$(SIZE) -Ax $(ELF)
+
+flash: $(BIN)
+	@echo "  FLASH  $(BIN)"
+	$(STFLASH) write $(BIN) 0x8000000
+
+boot: $(BIN)
+	@echo "  LOAD $(BIN) through bootloader"
+	$(STBOOT) -b$(BOOTSPEED) $(BOOTPORT) -w $(BIN)
+
+openocd:
+	openocd -f openocd.cfg
+dbg:
+	arm-none-eabi-gdb $(ELF) -ex 'target remote localhost:3333' -ex 'monitor reset halt'
+
+
+.PHONY: clean flash boot size openocd dbg
--- a/G0:G070,G0B1/i2c/README
+++ b/G0:G070,G0B1/i2c/README
@@ -0,0 +1,16 @@
+I2C @ PB6/PB7
+Scan available addresses, read/write data directly or over DMA
+
+Proto:
+
+i0..2 - setup I2C with lowest..highest speed (7.7, 10 and 100kHz)
+Ia addr - set I2C address
+Ig - dump content of I2Cbuf
+Iw bytes - send bytes (hex/dec/oct/bin) to I2C
+IW bytes - the same over DMA
+Ir reg n - read n bytes from I2C reg
+I2 reg16 n - read n bytes from 16-bit register
+In n - just read n bytes
+IN n - the same but with DMA
+Is - scan I2C bus
+U - send long buffer over USART
--- a/G0:G070,G0B1/i2c/i2c.c
+++ b/G0:G070,G0B1/i2c/i2c.c
@@ -0,0 +1,304 @@
+/*
+ * This file is part of the i2cscan project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stm32g0.h>
+#include <string.h>
+#include "strfunc.h" // hexdump
+#include "usart.h"
+#include "i2c.h"
+
+I2C_SPEED curI2Cspeed = LOW_SPEED;
+extern volatile uint32_t Tms;
+static uint32_t cntr;
+static uint8_t i2c_got_DMA_Rx = 0;
+volatile uint8_t I2C_scan_mode = 0; // == 1 when I2C is in scan mode
+static uint8_t i2caddr  = I2C_ADDREND; // current address in scan mode
+static volatile int I2Cbusy = 0, goterr = 0; // busy==1 when DMA active, goterr==1 if 't was error @ last sent
+static uint8_t I2Cbuf[256], i2cbuflen = 0; // buffer for DMA tx/rx and its len
+
+// macros for I2C rx/tx
+#define DMARXCCR    (DMA_CCR_MINC | DMA_CCR_TCIE | DMA_CCR_TEIE)
+#define DMATXCCR    (DMA_CCR_MINC | DMA_CCR_DIR | DMA_CCR_TCIE | DMA_CCR_TEIE)
+// macro for I2CCR1
+#define I2CCR1      (I2C_CR1_PE | I2C_CR1_RXDMAEN | I2C_CR1_TXDMAEN)
+
+// return 1 if I2Cbusy is set & timeout reached
+static inline int isI2Cbusy(){
+    cntr = Tms;
+    do{
+        if(Tms - cntr > I2C_TIMEOUT){ USND("Timeout, DMA transfer in progress?\n"); return 1;}
+    }while(I2Cbusy);
+    return 0;
+}
+
+// GPIO Resources: I2C1_SCL - PB6 (AF6), I2C1_SDA - PB7 (AF6)
+void i2c_setup(I2C_SPEED speed){
+    if(speed >= CURRENT_SPEED){
+        speed = curI2Cspeed;
+    }else{
+        curI2Cspeed = speed;
+    }
+    RCC->IOPENR |= RCC_IOPENR_GPIOBEN;
+    I2C1->CR1 = 0;
+    I2C1->ICR = 0x3f38; // clear all errors
+    GPIOB->AFR[0] = (GPIOB->AFR[0] & ~(GPIO_AFRL_AFSEL6 | GPIO_AFRL_AFSEL7)) |
+            6 << (6 * 4) | 6 << (7 * 4);
+    GPIOB->MODER = (GPIOB->MODER & ~(GPIO_MODER_MODE6 | GPIO_MODER_MODE7)) |
+                    GPIO_MODER_MODER6_AF | GPIO_MODER_MODER7_AF;
+    GPIOB->PUPDR = (GPIOB->PUPDR & !(GPIO_PUPDR_PUPD6 | GPIO_PUPDR_PUPD7)) |
+            GPIO_PUPDR6_PU | GPIO_PUPDR7_PU; // pullup
+    GPIOB->OTYPER |= GPIO_OTYPER_OT6 | GPIO_OTYPER_OT7; // both open-drain outputs
+    // I2C (default timing from PCLK - 64MHz)
+    RCC->APBENR1 |= RCC_APBENR1_I2C1EN; // clocking
+    if(speed == LOW_SPEED){ // 10kHz
+        // PRESC=F, SCLDEL=4, SDADEL=2, SCLH=0xC3, SCLL=0xC7
+        I2C1->TIMINGR = (0xF<<28) | (4<<20) | (2<<16) | (0xC3<<8) | (0xC7);
+    }else if(speed == HIGH_SPEED){ // 100kHz
+        I2C1->TIMINGR = (0xF<<28) | (4<<20) | (2<<16) | (0xF<<8) | (0x13);
+    }else{ // VERYLOW_SPEED - the lowest speed by STM register: ~7.7kHz
+        I2C1->TIMINGR = (0xF<<28) | (4<<20) | (2<<16) | (0xff<<8) | (0xff);
+    }
+    I2C1->CR1 = I2CCR1;
+    RCC->AHBENR |= RCC_AHBENR_DMA1EN;
+    NVIC_EnableIRQ(DMA1_Channel1_IRQn);
+    I2Cbusy = 0;
+}
+
+// setup DMA for rx (tx==0) or tx (tx==1)
+// DMAMUX: 10 - Rx, 11 - Tx
+static void i2cDMAsetup(int tx, uint8_t len){
+    if(tx){
+        DMA1_Channel1->CCR = DMATXCCR;
+        DMA1_Channel1->CPAR = (uint32_t) &I2C1->TXDR;
+        DMAMUX1_Channel0->CCR = 11;
+    }else{
+        DMA1_Channel1->CCR = DMARXCCR;
+        DMA1_Channel1->CPAR = (uint32_t) &I2C1->RXDR;
+        DMAMUX1_Channel0->CCR = 10;
+    }
+    DMA1_Channel1->CMAR = (uint32_t) I2Cbuf;
+    DMA1_Channel1->CNDTR = i2cbuflen = len;
+}
+
+static uint8_t i2c_start(uint8_t busychk){
+    if(busychk){
+        cntr = Tms;
+        while(I2C1->ISR & I2C_ISR_BUSY){
+            IWDG->KR = IWDG_REFRESH;
+            if(Tms - cntr > I2C_TIMEOUT){
+                USND("Line busy\n");
+                return 0;  // check busy
+        }}
+    }
+    cntr = Tms;
+    while(I2C1->CR2 & I2C_CR2_START){
+        IWDG->KR = IWDG_REFRESH;
+        if(Tms - cntr > I2C_TIMEOUT){
+            USND("No start\n");
+            return 0; // check start
+    }}
+    return 1;
+}
+
+// start writing
+static uint8_t i2c_startw(uint8_t addr, uint8_t nbytes, uint8_t stop){
+    if(!i2c_start(1)) return 0;
+    I2C1->CR2 = nbytes << 16 | addr;
+    if(stop) I2C1->CR2 |= I2C_CR2_AUTOEND; // autoend
+    // now start transfer
+    I2C1->CR2 |= I2C_CR2_START;
+    return 1;
+}
+
+/**
+ * write command byte to I2C
+ * @param addr - device address (TSYS01_ADDR0 or TSYS01_ADDR1)
+ * @param data - bytes to write
+ * @param nbytes - amount of bytes to write
+ * @param stop - to set STOP
+ * @return 0 if error
+ */
+static uint8_t write_i2cs(uint8_t addr, uint8_t *data, uint8_t nbytes, uint8_t stop){
+    if(!i2c_startw(addr, nbytes, stop)) return 0;
+    for(int i = 0; i < nbytes; ++i){
+        cntr = Tms;
+        while(!(I2C1->ISR & I2C_ISR_TXIS)){ // ready to transmit
+            IWDG->KR = IWDG_REFRESH;
+            if(I2C1->ISR & I2C_ISR_NACKF){
+                I2C1->ICR |= I2C_ICR_NACKCF;
+                //USND("NAK\n");
+                return 0;
+            }
+            if(Tms - cntr > I2C_TIMEOUT){
+                //USND("Timeout\n");
+                return 0;
+            }
+        }
+        I2C1->TXDR = data[i]; // send data
+    }
+    cntr = Tms;
+    // wait for data gone
+    while(I2C1->ISR & I2C_ISR_BUSY){
+        IWDG->KR = IWDG_REFRESH;
+        if(Tms - cntr > I2C_TIMEOUT){break;}
+    }
+    return 1;
+}
+
+uint8_t write_i2c(uint8_t addr, uint8_t *data, uint8_t nbytes){
+    if(isI2Cbusy()) return 0;
+    return write_i2cs(addr, data, nbytes, 1);
+}
+
+uint8_t write_i2c_dma(uint8_t addr, uint8_t *data, uint8_t nbytes){
+    if(!data || nbytes < 1) return 0;
+    memcpy((char*)I2Cbuf, (char*)data, nbytes);
+    if(isI2Cbusy()) return 0;
+    i2cDMAsetup(1, nbytes);
+    goterr = 0;
+    if(!i2c_startw(addr, nbytes, 1)) return 0;
+    I2Cbusy = 1;
+    DMA1_Channel1->CCR = DMATXCCR | DMA_CCR_EN; // start transfer
+    return 1;
+}
+
+// start reading
+static uint8_t i2c_startr(uint8_t addr, uint8_t nbytes, uint8_t busychk){
+    if(!i2c_start(busychk)) return 0;
+    // read N bytes
+    I2C1->CR2 = (nbytes<<16) | addr | 1 | I2C_CR2_AUTOEND | I2C_CR2_RD_WRN;
+    I2C1->CR2 |= I2C_CR2_START;
+    return 1;
+}
+
+/**
+ * read nbytes of data from I2C line
+ * all functions with `addr` should have addr = address << 1
+ * `data` should be an array with at least `nbytes` length
+ * @return 1 if all OK, 0 if NACK or no device found
+ */
+static uint8_t read_i2cb(uint8_t addr, uint8_t *data, uint8_t nbytes, uint8_t busychk){
+    if(!i2c_startr(addr, nbytes, busychk)) return 0;
+    uint8_t i;
+    for(i = 0; i < nbytes; ++i){
+        cntr = Tms;
+        while(!(I2C1->ISR & I2C_ISR_RXNE)){ // wait for data
+            IWDG->KR = IWDG_REFRESH;
+            if(I2C1->ISR & I2C_ISR_NACKF){
+                I2C1->ICR |= I2C_ICR_NACKCF;
+                //USND("NAK\n");
+                return 0;
+            }
+            if(Tms - cntr > I2C_TIMEOUT){
+                //USND("Timeout\n");
+                return 0;
+            }
+        }
+        *data++ = I2C1->RXDR;
+    }
+    return 1;
+ }
+
+uint8_t read_i2c(uint8_t addr, uint8_t *data, uint8_t nbytes){
+    if(isI2Cbusy()) return 0;
+    return read_i2cb(addr, data, nbytes, 1);
+}
+
+uint8_t read_i2c_dma(uint8_t addr, uint8_t nbytes){
+    if(nbytes < 1) return 0;
+    if(isI2Cbusy()) return 0;
+    i2cDMAsetup(0, nbytes);
+    goterr = 0;
+    if(!i2c_startr(addr, nbytes, 1)) return 0;
+    I2Cbusy = 1;
+    DMA1_Channel1->CCR = DMARXCCR | DMA_CCR_EN; // start transfer
+    return 1;
+}
+
+
+// read register reg
+uint8_t read_i2c_reg(uint8_t addr, uint8_t reg, uint8_t *data, uint8_t nbytes){
+    if(isI2Cbusy()) return 0;
+    if(!write_i2cs(addr, &reg, 1, 0)) return 0;
+    return read_i2cb(addr, data, nbytes, 0);
+}
+
+// read 16bit register reg
+uint8_t read_i2c_reg16(uint8_t addr, uint16_t reg16, uint8_t *data, uint8_t nbytes){
+    if(isI2Cbusy()) return 0;
+    if(!write_i2cs(addr, (uint8_t*)&reg16, 2, 0)) return 0;
+    return read_i2cb(addr, data, nbytes, 0);
+}
+
+void i2c_init_scan_mode(){
+    i2caddr = 1; // start from 1 as 0 is a broadcast address
+    I2C_scan_mode = 1;
+}
+
+// return 1 if next addr is active & return in as `addr`
+// if addresses are over, return 1 and set addr to I2C_NOADDR
+// if scan mode inactive, return 0 and set addr to I2C_NOADDR
+int i2c_scan_next_addr(uint8_t *addr){
+    if(isI2Cbusy()) return 0;
+    *addr = i2caddr;
+    if(i2caddr == I2C_ADDREND){
+        *addr = I2C_ADDREND;
+        I2C_scan_mode = 0;
+        return 0;
+    }
+    /*while(!u3txrdy);
+    USND("Addr: "); USND(uhex2str(i2caddr)); USND("\n");
+    usart3_sendbuf();*/
+    uint8_t byte;
+    if(!read_i2c((i2caddr++)<<1, &byte, 1)) return 0;
+    return 1;
+}
+
+// dump I2Cbuf
+void i2c_bufdudump(){
+    if(goterr){
+        USND("Last transfer ends with error!\n");
+        goterr = 0;
+    }
+    USND("I2C buffer:\n");
+    hexdump(usart3_sendstr, I2Cbuf, i2cbuflen);
+}
+
+void i2c_have_DMA_Rx(){
+    if(!i2c_got_DMA_Rx) return;
+    i2c_got_DMA_Rx = 0;
+    i2c_bufdudump();
+}
+
+int i2cdma_haderr(){
+    int r = goterr;
+    goterr = 0;
+    return r;
+}
+
+// Rx/Tx interrupts
+void dma1_channel1_isr(){
+    uint32_t isr = DMA1->ISR;
+    if(isr & (DMA_ISR_TCIF1 | DMA_ISR_TEIF1)){
+        if(isr & DMA_ISR_TEIF1) goterr = 1;
+        if(!(DMA1_Channel1->CCR & DMA_CCR_DIR)) i2c_got_DMA_Rx = 1; // last transfer was Rx
+        DMA1_Channel1->CCR = 0;
+        I2Cbusy = 0;
+    }
+    DMA1->IFCR = 0xf; // clear all flags for channel1
+}
--- a/G0:G070,G0B1/i2c/i2c.h
+++ b/G0:G070,G0B1/i2c/i2c.h
@@ -0,0 +1,50 @@
+/*
+ * This file is part of the i2cscan project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+#include <stdint.h>
+
+#define I2C_ADDREND  (0x80)
+
+typedef enum{
+    VERYLOW_SPEED,
+    LOW_SPEED,
+    HIGH_SPEED,
+    CURRENT_SPEED
+} I2C_SPEED;
+
+extern I2C_SPEED curI2Cspeed;
+extern volatile uint8_t I2C_scan_mode;
+
+// timeout of I2C bus in ms
+#define I2C_TIMEOUT             (100)
+
+void i2c_setup(I2C_SPEED speed);
+uint8_t read_i2c(uint8_t addr, uint8_t *data, uint8_t nbytes);
+uint8_t read_i2c_reg(uint8_t addr, uint8_t reg, uint8_t *data, uint8_t nbytes);
+uint8_t read_i2c_reg16(uint8_t addr, uint16_t reg16, uint8_t *data, uint8_t nbytes);
+uint8_t write_i2c(uint8_t addr, uint8_t *data, uint8_t nbytes);
+uint8_t write_i2c_dma(uint8_t addr, uint8_t *data, uint8_t nbytes);
+uint8_t read_i2c_dma(uint8_t addr, uint8_t nbytes);
+
+void i2c_bufdudump();
+void i2c_have_DMA_Rx();
+int i2cdma_haderr();
+
+void i2c_init_scan_mode();
+int i2c_scan_next_addr(uint8_t *addr);
--- a/G0:G070,G0B1/i2c/i2cscan.bin
+++ b/G0:G070,G0B1/i2c/i2cscan.bin
--- a/G0:G070,G0B1/i2c/i2cscan.cflags
+++ b/G0:G070,G0B1/i2c/i2cscan.cflags
@@ -0,0 +1 @@
+-std=c17
--- a/G0:G070,G0B1/i2c/i2cscan.config
+++ b/G0:G070,G0B1/i2c/i2cscan.config
@@ -0,0 +1,3 @@
+#define EBUG
+#define STM32G0
+#define STM32G070xx
--- a/G0:G070,G0B1/i2c/i2cscan.creator
+++ b/G0:G070,G0B1/i2c/i2cscan.creator
@@ -0,0 +1 @@
+[General]
--- a/G0:G070,G0B1/i2c/i2cscan.creator.user
+++ b/G0:G070,G0B1/i2c/i2cscan.creator.user
@@ -0,0 +1,171 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE QtCreatorProject>
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+    <value type="int" key="PE.EnvironmentAspect.Base">2</value>
+    <valuelist type="QVariantList" key="PE.EnvironmentAspect.Changes"/>
+    <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">ProjectExplorer.CustomExecutableRunConfiguration</value>
+    <value type="QString" key="ProjectExplorer.RunConfiguration.BuildKey"></value>
+    <value type="bool" key="RunConfiguration.UseCppDebugger">false</value>
+    <value type="bool" key="RunConfiguration.UseCppDebuggerAuto">true</value>
+    <value type="bool" key="RunConfiguration.UseQmlDebugger">false</value>
+    <value type="bool" key="RunConfiguration.UseQmlDebuggerAuto">true</value>
+   </valuemap>
+   <value type="int" key="ProjectExplorer.Target.RunConfigurationCount">1</value>
+  </valuemap>
+ </data>
+ <data>
+  <variable>ProjectExplorer.Project.TargetCount</variable>
+  <value type="int">1</value>
+ </data>
+ <data>
+  <variable>ProjectExplorer.Project.Updater.FileVersion</variable>
+  <value type="int">22</value>
+ </data>
+ <data>
+  <variable>Version</variable>
+  <value type="int">22</value>
+ </data>
+</qtcreator>
--- a/G0:G070,G0B1/i2c/i2cscan.cxxflags
+++ b/G0:G070,G0B1/i2c/i2cscan.cxxflags
@@ -0,0 +1 @@
+-std=c++17
--- a/G0:G070,G0B1/i2c/i2cscan.files
+++ b/G0:G070,G0B1/i2c/i2cscan.files
@@ -0,0 +1,9 @@
+main.c
+usart.c
+usart.h
+strfunc.c
+strfunc.h
+proto.c
+proto.h
+i2c.c
+i2c.h
--- a/G0:G070,G0B1/i2c/i2cscan.includes
+++ b/G0:G070,G0B1/i2c/i2cscan.includes
@@ -0,0 +1,4 @@
+.
+../inc
+../inc/Fx
+../inc/cm
--- a/G0:G070,G0B1/i2c/main.c
+++ b/G0:G070,G0B1/i2c/main.c
@@ -0,0 +1,80 @@
+/*
+ * This file is part of the usart project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stm32g0.h>
+#include "i2c.h"
+#include "proto.h"
+#include "strfunc.h"
+#include "usart.h"
+
+// KEY (intpullup->0) - PC0
+// LED - PC8
+
+volatile uint32_t Tms = 0;
+
+/* Called when systick fires */
+void sys_tick_handler(void){
+    ++Tms;
+}
+
+static void gpio_setup(void){
+    RCC->IOPENR |= RCC_IOPENR_GPIOCEN; // enable PC
+    // set PC8 as opendrain output, PC0 is pullup input, other as default (AIN)
+    GPIOC->MODER = (0xffffffff & ~(GPIO_MODER_MODE8 | GPIO_MODER_MODE0)) | GPIO_MODER_MODER8_O;
+    GPIOC->PUPDR = GPIO_PUPDR0_PU; // pullup
+    GPIOC->OTYPER = GPIO_OTYPER_OT8; // open drain
+}
+
+int main(void){
+    StartHSE();
+    SysTick_Config(8000); // 1ms counter
+    gpio_setup();
+    usart3_setup();
+    uint32_t T = 0;
+    int sent = 0;
+    /* Do nothing in main loop */
+    while (1){
+        if(I2C_scan_mode){
+            uint8_t addr;
+            int ok = i2c_scan_next_addr(&addr);
+            if(addr == I2C_ADDREND) USND("Scan ends\n");
+            else if(ok){
+                USND(uhex2str(addr));
+                USND(" ("); USND(u2str(addr));
+                USND(") - found device\n");
+            }
+        }
+        if(Tms - T > 499){ // blink LED
+            T = Tms;
+            pin_toggle(GPIOC, 1<<8);
+            usart3_sendbuf();
+        }
+        if(pin_read(GPIOC, 1<<0) == 0){ // key pressed - send data over USART
+            if(!sent){
+                usart3_sendstr("Button pressed\n");
+                sent = 1;
+            }
+        }else sent = 0;
+        int wasbo = 0;
+        char *rcv = usart3_getline(&wasbo);
+        if(wasbo) usart3_sendstr("Buffer overflow occured @ last message\n");
+        if(rcv) rcv = parse_cmd(rcv);
+        if(rcv) usart3_sendstr(rcv);
+        i2c_have_DMA_Rx(); // check if there's DMA Rx complete
+    }
+}
--- a/G0:G070,G0B1/i2c/openocd.cfg
+++ b/G0:G070,G0B1/i2c/openocd.cfg
@@ -0,0 +1,89 @@
+# script for stm32g0x family
+
+#
+# stm32g0 devices support SWD transports only.
+#
+source [find interface/stlink.cfg]
+source [find target/swj-dp.tcl]
+source [find mem_helper.tcl]
+
+if { [info exists CHIPNAME] } {
+	set _CHIPNAME $CHIPNAME
+} else {
+	set _CHIPNAME stm32g0x
+}
+
+set _ENDIAN little
+
+# Work-area is a space in RAM used for flash programming
+# Smallest proposed target has 8kB ram, use 4kB by default to avoid surprises
+if { [info exists WORKAREASIZE] } {
+	set _WORKAREASIZE $WORKAREASIZE
+} else {
+	set _WORKAREASIZE 0x1000
+}
+
+#jtag scan chain
+if { [info exists CPUTAPID] } {
+	set _CPUTAPID $CPUTAPID
+} else {
+	# Section 37.5.5 - corresponds to Cortex-M0+
+	set _CPUTAPID 0x0bc11477
+}
+
+swj_newdap $_CHIPNAME cpu -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_CPUTAPID
+dap create $_CHIPNAME.dap -chain-position $_CHIPNAME.cpu
+
+set _TARGETNAME $_CHIPNAME.cpu
+target create $_TARGETNAME cortex_m -endian $_ENDIAN -dap $_CHIPNAME.dap
+
+$_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size $_WORKAREASIZE -work-area-backup 0
+
+set _FLASHNAME $_CHIPNAME.flash
+flash bank $_FLASHNAME stm32l4x 0 0 0 0 $_TARGETNAME
+
+# reasonable default
+adapter speed 2000
+
+adapter srst delay 100
+if {[using_jtag]} {
+	jtag_ntrst_delay 100
+}
+
+reset_config srst_nogate
+
+if {![using_hla]} {
+	# if srst is not fitted use SYSRESETREQ to
+	# perform a soft reset
+	cortex_m reset_config sysresetreq
+}
+
+proc stm32g0x_default_reset_start {} {
+	# Reset clock is HSI16 (16 MHz)
+	adapter speed 2000
+}
+
+proc stm32g0x_default_examine_end {} {
+	# DBGMCU_CR |= DBG_STANDBY | DBG_STOP
+	mmw 0x40015804 0x00000006 0
+
+	# Stop watchdog counters during halt
+	# DBGMCU_APB1_FZ |= DBG_IWDG_STOP | DBG_WWDG_STOP
+	mmw 0x40015808 0x00001800 0
+}
+
+proc stm32g0x_default_reset_init {} {
+	# Increase clock to 64 Mhz
+	mmw 0x40022000 0x00000002 0x00000005	;# FLASH_ACR: Latency = 2
+	mww 0x4002100C 0x30000802				;# RCC_PLLCFGR = PLLR=/2, PLLN=8, PLLM=/1, PLLSRC=0x2
+	mmw 0x40021000 0x01000000 0x00000000	;# RCC_CR |= PLLON
+	mmw 0x40021008 0x00000002 0x00000005	;# RCC_CFGR: SW=PLLRCLK
+
+	# Boost JTAG frequency
+	adapter speed 4000
+}
+
+# Default hooks
+$_TARGETNAME configure -event examine-end { stm32g0x_default_examine_end }
+$_TARGETNAME configure -event reset-start { stm32g0x_default_reset_start }
+$_TARGETNAME configure -event reset-init { stm32g0x_default_reset_init }
--- a/G0:G070,G0B1/i2c/proto.c
+++ b/G0:G070,G0B1/i2c/proto.c
@@ -0,0 +1,186 @@
+/*
+ * This file is part of the i2cscan project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stm32g0.h>
+#include <string.h>
+#include "i2c.h"
+#include "strfunc.h"
+#include "usart.h"
+
+#define LOCBUFFSZ       (32)
+// local buffer for I2C data to send
+static uint8_t locBuffer[LOCBUFFSZ];
+extern volatile uint32_t Tms;
+
+const char *helpstring =
+        "i0..2 - setup I2C with lowest..highest speed (7.7, 10 and 100kHz)\n"
+        "Ia addr - set I2C address\n"
+        "Ig - dump content of I2Cbuf\n"
+        "Iw bytes - send bytes (hex/dec/oct/bin) to I2C\n"
+        "IW bytes - the same over DMA\n"
+        "Ir reg n - read n bytes from I2C reg\n"
+        "I2 reg16 n - read n bytes from 16-bit register\n"
+        "In n - just read n bytes\n"
+        "IN n - the same but with DMA\n"
+        "Is - scan I2C bus\n"
+        "T - print current Tms\n"
+        "U - send long buffer over USART\n"
+;
+
+const char *longbuff = "=======-10=======-20=======-30=======-40=======-50=======-60=======-70=======-80=======-90======-100\n";
+static void U3sendlong(const char *str){
+    int l = strlen(str);
+    while(l){
+        int sent = usart3_sendstr(str);
+        str += sent;
+        l -= sent;
+    }
+}
+
+static uint8_t i2cinited = 0;
+TRUE_INLINE char *setupI2C(char *buf){
+    buf = omit_spaces(buf);
+    if(*buf < '0' || *buf > '2') return "Wrong speed";
+    i2c_setup(*buf - '0');
+    i2cinited = 1;
+    return "OK";
+}
+
+static uint8_t I2Caddress = 0;
+TRUE_INLINE char *saI2C(char *buf){
+    uint32_t addr;
+    if(!getnum(buf, &addr) || addr > 0x7f) return "Wrong address";
+    I2Caddress = (uint8_t) addr << 1;
+    USND("I2Caddr="); USND(uhex2str(addr)); USND("\n");
+    return "OK";
+}
+static void rdI2C(char *buf, int is16){
+    uint32_t N;
+    int noreg = 0; // write register  (==1 - just read, ==2 - -//- using DMA)
+    char *nxt = NULL;
+    if(*buf == 'n'){
+        ++buf;
+        noreg = 1;
+    }else if(*buf == 'N'){
+        ++buf;
+        noreg = 2;
+    }else{
+        nxt = getnum(buf, &N);
+        if(!nxt || buf == nxt || N > 0xffff || (!is16 &&  N > 0xff)){
+            USND("Bad register number\n");
+            return;
+        }
+        buf = nxt;
+    }
+    uint16_t reg = N;
+    nxt = getnum(buf, &N);
+    if(!nxt || buf == nxt || N > LOCBUFFSZ){
+        USND("Bad length (<=32)\n");
+        return;
+    }
+    const char *erd = "Error reading I2C\n";
+    if(noreg){ // don't write register
+        if(noreg == 1){
+            USND("Simple read:\n");
+            if(!read_i2c(I2Caddress, locBuffer, N)){
+                USND(erd);
+                return;
+            }
+        }else{
+            USND("Try to read using DMA .. ");
+            if(!read_i2c_dma(I2Caddress, N)) USND(erd);
+            else USND("OK\n");
+            return;
+        }
+    }else{
+        if(is16){
+            if(!read_i2c_reg16(I2Caddress, reg, locBuffer, N)){
+                USND(erd);
+                return;
+            }
+        }else{
+            if(!read_i2c_reg(I2Caddress, reg, locBuffer, N)){
+                USND(erd);
+                return;
+            }
+        }
+    }
+    if(N == 0){ USND("OK"); return; }
+    if(!noreg){USND("Register "); USND(uhex2str(reg)); USND(":\n");}
+    hexdump(usart3_sendstr, locBuffer, N);
+}
+// read N numbers from buf, @return 0 if wrong or none
+TRUE_INLINE uint16_t readNnumbers(char *buf){
+    uint32_t D;
+    char *nxt;
+    uint16_t N = 0;
+    while((nxt = getnum(buf, &D)) && nxt != buf && N < LOCBUFFSZ){
+        buf = nxt;
+        locBuffer[N++] = (uint8_t) D&0xff;
+        USND("add byte: "); USND(uhex2str(D&0xff)); USND("\n");
+    }
+    USND("Send "); USND(u2str(N)); USND(" bytes\n");
+    return N;
+}
+static char *wrI2C(char *buf, int isdma){
+    uint16_t N = readNnumbers(buf);
+    int result = isdma ? write_i2c_dma(I2Caddress, locBuffer, N) :
+                         write_i2c(I2Caddress, locBuffer, N);
+    if(!result) return "Error writing I2C";
+    return "OK";
+}
+
+
+char *parse_cmd(char *buf){
+    // "long" commands
+    switch(*buf){
+        case 'i':
+            return setupI2C(buf + 1);
+        break;
+        case 'I':
+            if(!i2cinited) return "Init I2C first";
+            buf = omit_spaces(buf + 1);
+            if(*buf == 'a') return saI2C(buf + 1);
+            else if(*buf == 'r'){ rdI2C(buf + 1, 0); return NULL; }
+            else if(*buf == '2'){ rdI2C(buf + 1, 1); return NULL; }
+            else if(*buf == 'n'){ rdI2C(buf, 0); return NULL; }
+            else if(*buf == 'N'){ rdI2C(buf, 0); return NULL; }
+            else if(*buf == 'w') return wrI2C(buf + 1, 0);
+            else if(*buf == 'W') return wrI2C(buf + 1, 1);
+            else if(*buf == 's'){ i2c_init_scan_mode(); return "Start scan\n"; }
+            else if(*buf == 'g'){ i2c_bufdudump(); return NULL; }
+            else return "Command should be 'Ia', 'Iw', 'Ir' or 'Is'\n";
+        break;
+    }
+    // "short" commands
+    if(buf[1]) return buf; // echo wrong data
+    switch(*buf){
+        case 'T':
+            usart3_sendstr("T=");
+            usart3_sendstr(u2str(Tms));
+            usart3_send("\n", 1);
+        break;
+        case 'U':
+            U3sendlong(longbuff);
+        break;
+        default: // help
+            U3sendlong(helpstring);
+        break;
+    }
+    return NULL;
+}
--- a/G0:G070,G0B1/i2c/proto.h
+++ b/G0:G070,G0B1/i2c/proto.h
@@ -0,0 +1,22 @@
+/*
+ * This file is part of the i2cscan project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+char *parse_cmd(char *buf);
+
--- a/G0:G070,G0B1/i2c/rtc.bin
+++ b/G0:G070,G0B1/i2c/rtc.bin
--- a/G0:G070,G0B1/i2c/strfunc.c
+++ b/G0:G070,G0B1/i2c/strfunc.c
@@ -0,0 +1,255 @@
+/*
+ * This file is part of the i2cscan project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stm32g0.h>
+
+/**
+ * @brief hexdump - dump hex array by 16 bytes in string
+ * @param sendfun - function to send data
+ * @param arr - array to dump
+ * @param len - length of `arr`
+ */
+void hexdump(int (*sendfun)(const char *s), uint8_t *arr, uint16_t len){
+    char buf[52], *bptr = buf;
+    for(uint16_t l = 0; l < len; ++l, ++arr){
+        for(int16_t j = 1; j > -1; --j){
+            register uint8_t half = (*arr >> (4*j)) & 0x0f;
+            if(half < 10) *bptr++ = half + '0';
+            else *bptr++ = half - 10 + 'a';
+        }
+        if(l % 16 == 15){
+            *bptr++ = '\n';
+            *bptr = 0;
+            sendfun(buf);
+            bptr = buf;
+        }else *bptr++ = ' ';
+    }
+    if(bptr != buf){
+        *bptr++ = '\n';
+        *bptr = 0;
+        sendfun(buf);
+    }
+}
+
+/**
+ * @brief _2str - convert value into string buffer
+ * @param val - |value|
+ * @param minus - ==0 if value > 0
+ * @return buffer with number
+ */
+static char *_2str(uint32_t  val, uint8_t minus){
+    static char strbuf[12];
+    char *bufptr = &strbuf[11];
+    *bufptr = 0;
+    if(!val){
+        *(--bufptr) = '0';
+    }else{
+        while(val){
+            *(--bufptr) = val % 10 + '0';
+            val /= 10;
+        }
+    }
+    if(minus) *(--bufptr) = '-';
+    return bufptr;
+}
+
+// return string with number `val`
+char *u2str(uint32_t val){
+    return _2str(val, 0);
+}
+char *i2str(int32_t i){
+    uint8_t minus = 0;
+    uint32_t val;
+    if(i < 0){
+        minus = 1;
+        val = -i;
+    }else val = i;
+    return _2str(val, minus);
+}
+
+/**
+ * @brief uhex2str - print 32bit unsigned int as hex
+ * @param val - value
+ * @return string with number
+ */
+char *uhex2str(uint32_t val){
+    static char buf[12] = "0x";
+    int npos = 2;
+    uint8_t *ptr = (uint8_t*)&val + 3;
+    int8_t i, j, z=1;
+    for(i = 0; i < 4; ++i, --ptr){
+        if(*ptr == 0){ // omit leading zeros
+            if(i == 3) z = 0;
+            if(z) continue;
+        }
+        else z = 0;
+        for(j = 1; j > -1; --j){
+            uint8_t half = (*ptr >> (4*j)) & 0x0f;
+            if(half < 10) buf[npos++] = half + '0';
+            else buf[npos++] = half - 10 + 'a';
+        }
+    }
+    buf[npos] = 0;
+    return buf;
+}
+
+/**
+ * @brief omit_spaces - eliminate leading spaces and other trash in string
+ * @param buf - string
+ * @return - pointer to first character in `buf` > ' '
+ */
+char *omit_spaces(const char *buf){
+    while(*buf){
+        if(*buf > ' ') break;
+        ++buf;
+    }
+    return (char*)buf;
+}
+
+/**
+ * @brief getdec - read decimal number & return pointer to next non-number symbol
+ * @param buf - string
+ * @param N - number read
+ * @return Next non-number symbol. In case of overflow return `buf` and N==0xffffffff
+ */
+static char *getdec(const char *buf, uint32_t *N){
+    char *start = (char*)buf;
+    uint32_t num = 0;
+    while(*buf){
+        char c = *buf;
+        if(c < '0' || c > '9'){
+            break;
+        }
+        if(num > 429496729 || (num == 429496729 && c > '5')){ // overflow
+            *N = 0xffffff;
+            return start;
+        }
+        num *= 10;
+        num += c - '0';
+        ++buf;
+    }
+    *N = num;
+    return (char*)buf;
+}
+// read hexadecimal number (without 0x prefix!)
+static char *gethex(const char *buf, uint32_t *N){
+    char *start = (char*)buf;
+    uint32_t num = 0;
+    while(*buf){
+        char c = *buf;
+        uint8_t M = 0;
+        if(c >= '0' && c <= '9'){
+            M = '0';
+        }else if(c >= 'A' && c <= 'F'){
+            M = 'A' - 10;
+        }else if(c >= 'a' && c <= 'f'){
+            M = 'a' - 10;
+        }
+        if(M){
+            if(num & 0xf0000000){ // overflow
+                *N = 0xffffff;
+                return start;
+            }
+            num <<= 4;
+            num += c - M;
+        }else{
+            break;
+        }
+        ++buf;
+    }
+    *N = num;
+    return (char*)buf;
+}
+// read octal number (without 0 prefix!)
+static char *getoct(const char *buf, uint32_t *N){
+    char *start = (char*)buf;
+    uint32_t num = 0;
+    while(*buf){
+        char c = *buf;
+        if(c < '0' || c > '7'){
+            break;
+        }
+        if(num & 0xe0000000){ // overflow
+            *N = 0xffffff;
+            return start;
+        }
+        num <<= 3;
+        num += c - '0';
+        ++buf;
+    }
+    *N = num;
+    return (char*)buf;
+}
+// read binary number (without b prefix!)
+static char *getbin(const char *buf, uint32_t *N){
+    char *start = (char*)buf;
+    uint32_t num = 0;
+    while(*buf){
+        char c = *buf;
+        if(c < '0' || c > '1'){
+            break;
+        }
+        if(num & 0x80000000){ // overflow
+            *N = 0xffffff;
+            return start;
+        }
+        num <<= 1;
+        if(c == '1') num |= 1;
+        ++buf;
+    }
+    *N = num;
+    return (char*)buf;
+}
+
+/**
+ * @brief getnum - read uint32_t from string (dec, hex or bin: 127, 0x7f, 0b1111111)
+ * @param buf - buffer with number and so on
+ * @param N   - the number read
+ * @return pointer to first non-number symbol in buf
+ *      (if it is == buf, there's no number or if *N==0xffffffff there was overflow)
+ */
+char *getnum(const char *txt, uint32_t *N){
+    char *nxt = NULL;
+    char *s = omit_spaces(txt);
+    if(*s == '0'){ // hex, oct or 0
+        if(s[1] == 'x' || s[1] == 'X'){ // hex
+            nxt = gethex(s+2, N);
+            if(nxt == s+2) nxt = (char*)txt;
+        }else if(s[1] > '0'-1 && s[1] < '8'){ // oct
+            nxt = getoct(s+1, N);
+            if(nxt == s+1) nxt = (char*)txt;
+        }else{ // 0
+            nxt = s+1;
+            *N = 0;
+        }
+    }else if(*s == 'b' || *s == 'B'){
+        nxt = getbin(s+1, N);
+        if(nxt == s+1) nxt = (char*)txt;
+    }else{
+        nxt = getdec(s, N);
+        if(nxt == s) nxt = (char*)txt;
+    }
+    return nxt;
+}
+
+/*
+void mymemcpy(char *dest, const char *src, int len){
+    if(len < 1) return;
+    while(len--) *dest++ = *src++;
+}
+*/
--- a/G0:G070,G0B1/i2c/strfunc.h
+++ b/G0:G070,G0B1/i2c/strfunc.h
@@ -0,0 +1,29 @@
+/*
+ * This file is part of the i2cscan project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <string.h>
+
+void hexdump(int (*sendfun)(const char *s), uint8_t *arr, uint16_t len);
+char *u2str(uint32_t val);
+char *i2str(int32_t i);
+char *uhex2str(uint32_t val);
+char *getnum(const char *txt, uint32_t *N);
+char *omit_spaces(const char *buf);
+void mymemcpy(char *dest, const char *src, int len);
--- a/G0:G070,G0B1/i2c/usart.c
+++ b/G0:G070,G0B1/i2c/usart.c
@@ -0,0 +1,169 @@
+/*
+ * This file is part of the usart project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stm32g0.h>
+#include <string.h>
+
+#include "usart.h"
+
+// RX/TX DMA->CCR without EN flag
+#define DMARXCCR    (DMA_CCR_MINC | DMA_CCR_TCIE | DMA_CCR_TEIE)
+#define DMATXCCR    (DMA_CCR_MINC | DMA_CCR_DIR | DMA_CCR_TCIE | DMA_CCR_TEIE)
+
+volatile int u3txrdy = 1, u3rxrdy = 0; // transmission done, next line received
+static volatile int bufovr = 0, wasbufovr = 0; // Rx buffer overflow or error flag -> delete next line
+static volatile int rbufno = 0, tbufno = 0; // current buf number
+static volatile char rbuf[2][UARTBUFSZ], tbuf[2][UARTBUFSZ]; // receive & transmit buffers
+static volatile int rxlen[2] = {0}, txlen[2] = {0};
+
+char *usart3_getline(int *wasbo){
+    if(wasbo) *wasbo = wasbufovr;
+    wasbufovr = 0;
+    if(!u3rxrdy) return NULL;
+    u3rxrdy = 0; // clear ready flag
+    return (char*)rbuf[!rbufno]; // current buffer is in filling stage, return old - filled - buffer
+}
+
+#define USART_BRR(speed)    ((64000000 + speed/2) / speed)
+
+// USART3 @ PD8 (Tx) and PD9 (Rx) - both AF0
+void usart3_setup(){
+    RCC->IOPENR |= RCC_IOPENR_GPIODEN; // enable PD
+    RCC->AHBENR |= RCC_AHBENR_DMA1EN; // enable DMA1
+    // set PD8 and PD9 as AF
+    GPIOD->MODER = (GPIOD->MODER & ~(GPIO_MODER_MODE8 | GPIO_MODER_MODE9))
+            | GPIO_MODER_MODER8_AF | GPIO_MODER_MODER9_AF;
+    // AF0 for USART3 @ PD8/PD9
+    GPIOD->AFR[1] = GPIOD->AFR[1] & ~(GPIO_AFRH_AFSEL8 | GPIO_AFRH_AFSEL9);
+    // enable USART3 clocking
+    RCC->APBENR1 |= RCC_APBENR1_USART3EN;
+    // baudrate 115200
+    USART3->BRR = USART_BRR(115200);
+    // eol character: '/n'
+    USART3->CR2 = USART_CR2_ADD_VAL('\n');
+    // enable DMA transmission
+    USART3->CR3 = USART_CR3_DMAT | USART_CR3_DMAR;
+    // set up DMA channels: 2 - Tx, 3 - Rx
+    // Tx channel: mem++, mem->periph, 8bit, compl.&err. irq
+    DMA1_Channel2->CCR = DMATXCCR;
+    DMA1_Channel2->CPAR = (uint32_t) &USART3->TDR; // peripherial address
+    // Rx channel: mem++, periph->mem, 8bit, compl.&err. irq
+    DMA1_Channel3->CCR = DMARXCCR;
+    DMA1_Channel3->CPAR = (uint32_t) &USART3->RDR; // peripherial address
+    DMA1_Channel3->CNDTR = UARTBUFSZ;
+    DMA1_Channel3->CMAR = (uint32_t)&rbuf[rbufno];
+    // set up DMAMUX channels: 55 - USART3_TX, 54 - USART3_RX
+    // enumeration of DMAMUX starts from 0 (DMA - from 1)!
+    DMAMUX1_Channel1->CCR = 55;
+    DMAMUX1_Channel2->CCR = 54;
+    // charmatch interrupt, enable transmitter and receiver, enable usart
+    USART3->CR1 = USART_CR1_CMIE | USART_CR1_TE | USART_CR1_RE | USART_CR1_UE;
+    USART3->ICR = 0xffffffff; // clear all flags
+    DMA1_Channel3->CCR = DMARXCCR | DMA_CCR_EN; // start receiving right now
+    NVIC_EnableIRQ(USART3_4_IRQn);
+    NVIC_EnableIRQ(DMA1_Channel2_3_IRQn);
+}
+
+int usart3_send(const char *str, int len){
+    int rest = UARTBUFSZ - txlen[tbufno];
+    if(rest == 0 && !u3txrdy) return 0; // buffer is full while transmission in process
+    if(len < rest) rest = len;
+    memcpy((char*)(tbuf[tbufno] + txlen[tbufno]), str, rest);
+    txlen[tbufno] += rest;
+    if(!u3txrdy) return rest;
+    if(txlen[tbufno] == UARTBUFSZ) usart3_sendbuf();
+    if(rest == len) return len;
+    len -= rest;
+    // now fill another - empty - buffer
+    if(len > UARTBUFSZ) len = UARTBUFSZ;
+    memcpy((char*)tbuf[tbufno], str + rest, len);
+    txlen[tbufno] = len;
+    return rest + len;
+}
+
+int usart3_sendstr(const char *str){
+    int l = strlen(str);
+    return usart3_send(str, l);
+}
+
+/**
+ * @brief usart3_sendbuf - send current buffer
+ */
+void usart3_sendbuf(){
+    if(!u3txrdy || txlen[tbufno] == 0) return;
+    // set up DMA
+    DMA1_Channel2->CCR = DMATXCCR;
+    DMA1_Channel2->CMAR = (uint32_t)&tbuf[tbufno];
+    DMA1_Channel2->CNDTR = txlen[tbufno];
+    USART3->ICR = USART_ICR_TCCF; // clear TC flag
+    u3txrdy = 0;
+    // activate DMA
+    DMA1_Channel2->CCR = DMATXCCR | DMA_CCR_EN;
+    tbufno = !tbufno; // swap buffers
+    txlen[tbufno] = 0;
+}
+
+// return amount of bytes sents
+int usart3_send_blocking(const char *str, int len){
+    if(!u3txrdy) return 0;
+    USART3->CR1 |= USART_CR1_TE;
+    for(int i = 0; i < len; ++i){
+        while(!(USART3->ISR & USART_ISR_TXE_TXFNF));
+        USART3->TDR = *str++;
+    }
+    return len;
+}
+
+// interrupt by '\n'
+void usart3_4_isr(){
+    if(USART3->ISR & USART_ISR_CMF){ // got '\n' @ USART3
+        DMA1_Channel3->CCR = DMARXCCR;
+        if(!bufovr){ // forget about broken line @ buffer overflow
+            u3rxrdy = 1;
+            int l = UARTBUFSZ - DMA1_Channel3->CNDTR - 1; // strlen
+            rxlen[rbufno] = l;
+            rbuf[rbufno][l] = 0;
+            rbufno = !rbufno;
+        }else{
+            bufovr = 0;
+            wasbufovr = 1;
+        }
+        // reload DMA Rx with next buffer
+        DMA1_Channel3->CMAR = (uint32_t)&rbuf[rbufno];
+        DMA1_Channel3->CNDTR = UARTBUFSZ;
+        DMA1_Channel3->CCR = DMARXCCR | DMA_CCR_EN;
+    }
+    USART3->ICR = 0xffffffff; // clear all flags
+}
+
+// ch2 - Tx, ch3 - Rx
+void dma1_channel2_3_isr(){
+    uint32_t isr = DMA1->ISR;
+    if(isr & (DMA_ISR_TCIF2 | DMA_ISR_TEIF2)){ // transfer complete or error
+        u3txrdy = 1;
+    }
+    if(isr & (DMA_ISR_TCIF3 | DMA_ISR_TEIF3)){ // receive complete or error -> buffer overflow
+        if(rbuf[rbufno][UARTBUFSZ-1] != '\n'){ // last symbol is not a newline
+            bufovr = 1;
+            DMA1_Channel3->CCR = DMARXCCR;
+            DMA1_Channel3->CNDTR = UARTBUFSZ;
+            DMA1_Channel3->CCR = DMARXCCR | DMA_CCR_EN;
+        }
+    }
+    DMA1->IFCR = 0xff0; // clear all flags for 2&3
+}
--- a/G0:G070,G0B1/i2c/usart.h
+++ b/G0:G070,G0B1/i2c/usart.h
@@ -0,0 +1,32 @@
+/*
+ * This file is part of the usart project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#define UARTBUFSZ   (64)
+
+#define USND(t)  do{usart3_sendstr(t);}while(0)
+
+extern volatile int u3txrdy, u3rxrdy;
+
+void usart3_setup();
+int usart3_send_blocking(const char *str, int len);
+int usart3_send(const char *str, int len);
+void usart3_sendbuf();
+char *usart3_getline(int *wasbo);
+int usart3_sendstr(const char *str);
--- a/G0:G070,G0B1/i2c/version.inc
+++ b/G0:G070,G0B1/i2c/version.inc
@@ -0,0 +1,2 @@
+#define BUILD_NUMBER "1"
+#define BUILD_DATE "2023-01-18"
--- a/G0:G070,G0B1/inc/Fx/common_macros.h
+++ b/G0:G070,G0B1/inc/Fx/common_macros.h
@@ -0,0 +1,61 @@
+/*
+ * common_macros.h - common usable things
+ *
+ * Copyright 2018 Edward V. Emelianoff <eddy@sao.ru, edward.emelianoff@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+#pragma once
+#ifndef __COMMON_MACROS_H__
+#define __COMMON_MACROS_H__
+
+#include <stdint.h>
+
+#ifndef _U_
+#define _U_ __attribute__((__unused__))
+#endif
+
+#ifndef TRUE
+#define TRUE 1
+#endif
+
+#ifndef FALSE
+#define FALSE 0
+#endif
+
+#ifndef TRUE_INLINE
+#define TRUE_INLINE  __attribute__((always_inline)) static inline
+#endif
+
+#ifndef NULL
+#define NULL (0)
+#endif
+
+// some good things from CMSIS
+#define nop()   __NOP()
+
+#define pin_toggle(gpioport, gpios)  do{  \
+    register uint32_t __port = gpioport->ODR;  \
+    gpioport->BSRR = ((__port & (gpios)) << 16) | (~__port & (gpios));}while(0)
+
+#define pin_set(gpioport, gpios)  do{gpioport->BSRR = gpios;}while(0)
+#define pin_clear(gpioport, gpios) do{gpioport->BSRR = ((gpios) << 16);}while(0)
+#define pin_read(gpioport, gpios) (gpioport->IDR & (gpios) ? 1 : 0)
+#define pin_write(gpioport, gpios)  do{gpioport->ODR = gpios;}while(0)
+
+
+
+#endif // __COMMON_MACROS_H__
--- a/G0:G070,G0B1/inc/Fx/flash_size_reg.h
+++ b/G0:G070,G0B1/inc/Fx/flash_size_reg.h
@@ -0,0 +1,12 @@
+#define STM32F0_FlashAddr   0x1FFFF7CC   // âÁÚÏ×ÙÊ ÁÄÒÅÓ ÅÍËÏÓÔÉ ÆÌÜÛ-ÐÁÍÑÔÉ STM32F0
+#define STM32F1_FlashAddr   0x1FFFF7E0   // âÁÚÏ×ÙÊ ÁÄÒÅÓ ÅÍËÏÓÔÉ ÆÌÜÛ-ÐÁÍÑÔÉ STM32F1
+#define STM32F2_FlashAddr   0x1FFF7A22   // âÁÚÏ×ÙÊ ÁÄÒÅÓ ÅÍËÏÓÔÉ ÆÌÜÛ-ÐÁÍÑÔÉ STM32F2
+#define STM32F3_FlashAddr   0x1FFFF7CC   // âÁÚÏ×ÙÊ ÁÄÒÅÓ ÅÍËÏÓÔÉ ÆÌÜÛ-ÐÁÍÑÔÉ STM32F3
+#define STM32F4_FlashAddr   0x1FFF7A22   // âÁÚÏ×ÙÊ ÁÄÒÅÓ ÅÍËÏÓÔÉ ÆÌÜÛ-ÐÁÍÑÔÉ STM32F4
+#define STM32F7_FlashAddr   0x1FF0F442   // âÁÚÏ×ÙÊ ÁÄÒÅÓ ÆÌÜÛ-ÐÁÍÑÔÉ STM32F7
+#define STM32L0_FlashAddr   0x1FF8007C   // âÁÚÏ×ÙÊ ÁÄÒÅÓ ÅÍËÏÓÔÉ ÆÌÜÛ-ÐÁÍÑÔÉ STM32L0
+#define STM32L1_FlashAddr   0x1FF8004C   // âÁÚÏ×ÙÊ ÁÄÒÅÓ ÅÍËÏÓÔÉ ÆÌÜÛ-ÐÁÍÑÔÉ STM32L1
+#define STM32L4_FlashAddr   0x1FFF75E0   // âÁÚÏ×ÙÊ ÁÄÒÅÓ ÅÍËÏÓÔÉ ÆÌÜÛ-ÐÁÍÑÔÉ STM32L4
+#define STM32H7_FlashAddr   0x1FF0F442   // âÁÚÏ×ÙÊ ÁÄÒÅÓ ÆÌÜÛ-ÐÁÍÑÔÉ STM32H7
+
+blocksize=2k if memory>=128k
--- a/G0:G070,G0B1/inc/Fx/stm32g0.h
+++ b/G0:G070,G0B1/inc/Fx/stm32g0.h
@@ -0,0 +1,260 @@
+/*
+ * stm32f0.h
+ *
+ * Copyright 2017 Edward V. Emelianoff <eddy@sao.ru, edward.emelianoff@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+#pragma once
+
+#include "vector.h"
+#include "stm32g0xx.h"
+#include "common_macros.h"
+
+
+/************************* RCC *************************/
+// reset clocking registers
+/* TRUE_INLINE void sysreset(void){ // do nothing
+}
+*/
+
+/*
+ * R=2..8, Q=2..8, P=2..32; N=8..86, M=1..8
+ * fvco = 64..344MHz (after /M should be 2.66..16 -> for 8MHz HSE M=1..3!!!)
+ * For 8MHZ:
+ * fvco = (8/M)*N -> N(128)=16, M(128)=1
+ * fpllp = fvco/P (<=122MHz) -> P(64)=2
+ * fpllq = fvco/Q (<=128MHz) -> Q(64)=2
+ * fpllr = fvco/R (<=64MHz)  -> R(64)=2
+ * AHB prescaler (64MHz) = 1
+ * APB prescaler (64MHz) = 1
+ *
+ * fp=fq=fr=fsys=64MHz => M=1, N=16, P=2, Q=2, R=2
+*/
+#ifndef PLLN
+#define PLLN    16
+#endif
+#ifndef PLLM
+#define PLLM    1
+#endif
+#ifndef PLLP
+#define PLLP    2
+#endif
+#ifndef PLLQ
+#define PLLQ    2
+#endif
+#ifndef PLLR
+#define PLLR    2
+#endif
+#ifndef PPRE
+#define PPRE    1
+#endif
+#ifndef HPRE
+#define HPRE    1
+#endif
+
+#define WAITWHILE(x)  do{register uint32_t StartUpCounter = 0; while((x) && (++StartUpCounter < 0xffffff)){nop();}}while(0)
+TRUE_INLINE void StartHSEHSI(int isHSE){
+    RCC->CR &= ~RCC_CR_PLLON; // disable PLL
+    WAITWHILE(RCC->CR & RCC_CR_PLLRDY); // wait while PLL on
+    if(isHSE){
+        RCC->CR |= RCC_CR_HSEON;
+        WAITWHILE(!(RCC->CR & RCC_CR_HSERDY)); // wait while HSE isn't on
+    }else RCC->CR |= RCC_CR_HSION;
+    RCC->APBENR1 |= RCC_APBENR1_PWREN;
+    // Enable high performance mode
+    PWR->CR1 = PWR_CR1_VOS_0;
+    WAITWHILE(PWR->SR2 & PWR_SR2_VOSF);
+    if(isHSE){
+        RCC->PLLCFGR = ((PLLR-1)<<29) | ((PLLQ-1)<<25) | ((PLLP-1)<<17) | (PLLN<<8) | ((PLLM-1)<<4)
+                | RCC_PLLCFGR_PLLREN | RCC_PLLCFGR_PLLQEN /* | RCC_PLLCFGR_PLLPEN */
+                | RCC_PLLCFGR_PLLSRC_HSE;
+    }else{ // 64MHz from HSI16
+        RCC->PLLCFGR = (8<<8) | (1<<4)
+                // enable P if need
+                | RCC_PLLCFGR_PLLREN  | RCC_PLLCFGR_PLLQEN /* | RCC_PLLCFGR_PLLPEN */
+                | RCC_PLLCFGR_PLLSRC_HSI;
+    }
+    RCC->CR |= RCC_CR_PLLON;
+    WAITWHILE(!(RCC->CR & RCC_CR_PLLRDY));
+    FLASH->ACR |= FLASH_ACR_PRFTEN | FLASH_ACR_ICEN | FLASH_ACR_LATENCY_2; // FLASH_ACR_LATENCY_2 for 64MHz
+    // set sysclk switch to pll, setup AHB/APB
+    RCC->CFGR = RCC_CFGR_SW_1 | PPRE << 12 | HPRE << 8;
+}
+
+#define StartHSE()  do{StartHSEHSI(1);}while(0)
+#define StartHSI()  do{StartHSEHSI(0);}while(0)
+
+/************************* GPIO *************************/
+
+/*******************  Bit definition for GPIO_MODER register  *****************/
+// _AI - analog inpt, _O - general output, _AF - alternate function
+#define GPIO_MODER_MODER0_AI        ((uint32_t)0x00000003)
+#define GPIO_MODER_MODER0_O         ((uint32_t)0x00000001)
+#define GPIO_MODER_MODER0_AF        ((uint32_t)0x00000002)
+#define GPIO_MODER_MODER1_AI        ((uint32_t)0x0000000C)
+#define GPIO_MODER_MODER1_O         ((uint32_t)0x00000004)
+#define GPIO_MODER_MODER1_AF        ((uint32_t)0x00000008)
+#define GPIO_MODER_MODER2_AI        ((uint32_t)0x00000030)
+#define GPIO_MODER_MODER2_O         ((uint32_t)0x00000010)
+#define GPIO_MODER_MODER2_AF        ((uint32_t)0x00000020)
+#define GPIO_MODER_MODER3_AI        ((uint32_t)0x000000C0)
+#define GPIO_MODER_MODER3_O         ((uint32_t)0x00000040)
+#define GPIO_MODER_MODER3_AF        ((uint32_t)0x00000080)
+#define GPIO_MODER_MODER4_AI        ((uint32_t)0x00000300)
+#define GPIO_MODER_MODER4_O         ((uint32_t)0x00000100)
+#define GPIO_MODER_MODER4_AF        ((uint32_t)0x00000200)
+#define GPIO_MODER_MODER5_AI        ((uint32_t)0x00000C00)
+#define GPIO_MODER_MODER5_O         ((uint32_t)0x00000400)
+#define GPIO_MODER_MODER5_AF        ((uint32_t)0x00000800)
+#define GPIO_MODER_MODER6_AI        ((uint32_t)0x00003000)
+#define GPIO_MODER_MODER6_O         ((uint32_t)0x00001000)
+#define GPIO_MODER_MODER6_AF        ((uint32_t)0x00002000)
+#define GPIO_MODER_MODER7_AI        ((uint32_t)0x0000C000)
+#define GPIO_MODER_MODER7_O         ((uint32_t)0x00004000)
+#define GPIO_MODER_MODER7_AF        ((uint32_t)0x00008000)
+#define GPIO_MODER_MODER8_AI        ((uint32_t)0x00030000)
+#define GPIO_MODER_MODER8_O         ((uint32_t)0x00010000)
+#define GPIO_MODER_MODER8_AF        ((uint32_t)0x00020000)
+#define GPIO_MODER_MODER9_AI        ((uint32_t)0x000C0000)
+#define GPIO_MODER_MODER9_O         ((uint32_t)0x00040000)
+#define GPIO_MODER_MODER9_AF        ((uint32_t)0x00080000)
+#define GPIO_MODER_MODER10_AI       ((uint32_t)0x00300000)
+#define GPIO_MODER_MODER10_O        ((uint32_t)0x00100000)
+#define GPIO_MODER_MODER10_AF       ((uint32_t)0x00200000)
+#define GPIO_MODER_MODER11_AI       ((uint32_t)0x00C00000)
+#define GPIO_MODER_MODER11_O        ((uint32_t)0x00400000)
+#define GPIO_MODER_MODER11_AF       ((uint32_t)0x00800000)
+#define GPIO_MODER_MODER12_AI       ((uint32_t)0x03000000)
+#define GPIO_MODER_MODER12_O        ((uint32_t)0x01000000)
+#define GPIO_MODER_MODER12_AF       ((uint32_t)0x02000000)
+#define GPIO_MODER_MODER13_AI       ((uint32_t)0x0C000000)
+#define GPIO_MODER_MODER13_O        ((uint32_t)0x04000000)
+#define GPIO_MODER_MODER13_AF       ((uint32_t)0x08000000)
+#define GPIO_MODER_MODER14_AI       ((uint32_t)0x30000000)
+#define GPIO_MODER_MODER14_O        ((uint32_t)0x10000000)
+#define GPIO_MODER_MODER14_AF       ((uint32_t)0x20000000)
+#define GPIO_MODER_MODER15_AI       ((uint32_t)0xC0000000)
+#define GPIO_MODER_MODER15_O        ((uint32_t)0x40000000)
+#define GPIO_MODER_MODER15_AF       ((uint32_t)0x80000000)
+
+/*******************  Bit definition for GPIO_PUPDR register  *****************/
+// no/pullup/pulldown/reserved
+// for n in $(seq 0 15); do echo "#define GPIO_PUPDR${n}_PU              ((uint32_t)(1<<$((n*2))))";
+// echo "#define GPIO_PUPDR${n}_PD              ((uint32_t)(1<<$((n*2+1))))"; done
+// alt+select column -> delete
+#define GPIO_PUPDR0_PU              ((uint32_t)(1<<0))
+#define GPIO_PUPDR0_PD              ((uint32_t)(1<<1))
+#define GPIO_PUPDR1_PU              ((uint32_t)(1<<2))
+#define GPIO_PUPDR1_PD              ((uint32_t)(1<<3))
+#define GPIO_PUPDR2_PU              ((uint32_t)(1<<4))
+#define GPIO_PUPDR2_PD              ((uint32_t)(1<<5))
+#define GPIO_PUPDR3_PU              ((uint32_t)(1<<6))
+#define GPIO_PUPDR3_PD              ((uint32_t)(1<<7))
+#define GPIO_PUPDR4_PU              ((uint32_t)(1<<8))
+#define GPIO_PUPDR4_PD              ((uint32_t)(1<<9))
+#define GPIO_PUPDR5_PU              ((uint32_t)(1<<10))
+#define GPIO_PUPDR5_PD              ((uint32_t)(1<<11))
+#define GPIO_PUPDR6_PU              ((uint32_t)(1<<12))
+#define GPIO_PUPDR6_PD              ((uint32_t)(1<<13))
+#define GPIO_PUPDR7_PU              ((uint32_t)(1<<14))
+#define GPIO_PUPDR7_PD              ((uint32_t)(1<<15))
+#define GPIO_PUPDR8_PU              ((uint32_t)(1<<16))
+#define GPIO_PUPDR8_PD              ((uint32_t)(1<<17))
+#define GPIO_PUPDR9_PU              ((uint32_t)(1<<18))
+#define GPIO_PUPDR9_PD              ((uint32_t)(1<<19))
+#define GPIO_PUPDR10_PU             ((uint32_t)(1<<20))
+#define GPIO_PUPDR10_PD             ((uint32_t)(1<<21))
+#define GPIO_PUPDR11_PU             ((uint32_t)(1<<22))
+#define GPIO_PUPDR11_PD             ((uint32_t)(1<<23))
+#define GPIO_PUPDR12_PU             ((uint32_t)(1<<24))
+#define GPIO_PUPDR12_PD             ((uint32_t)(1<<25))
+#define GPIO_PUPDR13_PU             ((uint32_t)(1<<26))
+#define GPIO_PUPDR13_PD             ((uint32_t)(1<<27))
+#define GPIO_PUPDR14_PU             ((uint32_t)(1<<28))
+#define GPIO_PUPDR14_PD             ((uint32_t)(1<<29))
+#define GPIO_PUPDR15_PU             ((uint32_t)(1<<30))
+#define GPIO_PUPDR15_PD             ((uint32_t)(1<<31))
+// OSPEEDR
+// for n in $(seq 0 15); do echo "#define GPIO_OSPEEDR${n}_MED           ((uint32_t)(1<<$((n*2))))";
+// echo "#define GPIO_OSPEEDR${n}_HIGH          ((uint32_t)(3<<$((2*n))))"; done
+#define GPIO_OSPEEDR0_MED           ((uint32_t)(1<<0))
+#define GPIO_OSPEEDR0_HIGH          ((uint32_t)(3<<0))
+#define GPIO_OSPEEDR1_MED           ((uint32_t)(1<<2))
+#define GPIO_OSPEEDR1_HIGH          ((uint32_t)(3<<2))
+#define GPIO_OSPEEDR2_MED           ((uint32_t)(1<<4))
+#define GPIO_OSPEEDR2_HIGH          ((uint32_t)(3<<4))
+#define GPIO_OSPEEDR3_MED           ((uint32_t)(1<<6))
+#define GPIO_OSPEEDR3_HIGH          ((uint32_t)(3<<6))
+#define GPIO_OSPEEDR4_MED           ((uint32_t)(1<<8))
+#define GPIO_OSPEEDR4_HIGH          ((uint32_t)(3<<8))
+#define GPIO_OSPEEDR5_MED           ((uint32_t)(1<<10))
+#define GPIO_OSPEEDR5_HIGH          ((uint32_t)(3<<10))
+#define GPIO_OSPEEDR6_MED           ((uint32_t)(1<<12))
+#define GPIO_OSPEEDR6_HIGH          ((uint32_t)(3<<12))
+#define GPIO_OSPEEDR7_MED           ((uint32_t)(1<<14))
+#define GPIO_OSPEEDR7_HIGH          ((uint32_t)(3<<14))
+#define GPIO_OSPEEDR8_MED           ((uint32_t)(1<<16))
+#define GPIO_OSPEEDR8_HIGH          ((uint32_t)(3<<16))
+#define GPIO_OSPEEDR9_MED           ((uint32_t)(1<<18))
+#define GPIO_OSPEEDR9_HIGH          ((uint32_t)(3<<18))
+#define GPIO_OSPEEDR10_MED          ((uint32_t)(1<<20))
+#define GPIO_OSPEEDR10_HIGH         ((uint32_t)(3<<20))
+#define GPIO_OSPEEDR11_MED          ((uint32_t)(1<<22))
+#define GPIO_OSPEEDR11_HIGH         ((uint32_t)(3<<22))
+#define GPIO_OSPEEDR12_MED          ((uint32_t)(1<<24))
+#define GPIO_OSPEEDR12_HIGH         ((uint32_t)(3<<24))
+#define GPIO_OSPEEDR13_MED          ((uint32_t)(1<<26))
+#define GPIO_OSPEEDR13_HIGH         ((uint32_t)(3<<26))
+#define GPIO_OSPEEDR14_MED          ((uint32_t)(1<<28))
+#define GPIO_OSPEEDR14_HIGH         ((uint32_t)(3<<28))
+#define GPIO_OSPEEDR15_MED          ((uint32_t)(1<<30))
+#define GPIO_OSPEEDR15_HIGH         ((uint32_t)(3<<30))
+
+
+
+/******************  FLASH Keys  **********************************************/
+#define RDP_Key                 ((uint16_t)0x00A5)
+#define FLASH_KEY1              ((uint32_t)0x45670123)
+#define FLASH_KEY2              ((uint32_t)0xCDEF89AB)
+#define FLASH_SIZE_REG          ((uint32_t)0x1FFFF7CC)
+
+/************************* ADC *************************/
+/* inner termometer calibration values
+ *         Temp = (V30 - Vsense)/Avg_Slope + 30
+ *         Avg_Slope = (V30 - V110) / (110 - 30)
+ */
+#define TEMP110_CAL_ADDR ((uint16_t*) ((uint32_t) 0x1FFFF7C2))
+#define TEMP30_CAL_ADDR ((uint16_t*) ((uint32_t) 0x1FFFF7B8))
+// VDDA_Actual = 3.3V * VREFINT_CAL / average vref value
+#define VREFINT_CAL_ADDR ((uint16_t*) ((uint32_t) 0x1FFFF7BA))
+#define VDD_CALIB ((uint16_t) (330))
+#define VDD_APPLI ((uint16_t) (300))
+
+/************************* USART *************************/
+
+#define USART_CR2_ADD_SHIFT     24
+// set address/character match value
+#define USART_CR2_ADD_VAL(x)        ((x) << USART_CR2_ADD_SHIFT)
+
+/************************* IWDG *************************/
+#define IWDG_REFRESH      (uint32_t)(0x0000AAAA)
+#define IWDG_WRITE_ACCESS (uint32_t)(0x00005555)
+#define IWDG_START        (uint32_t)(0x0000CCCC)
+
+
+//#define  do{}while(0)
+
--- a/G0:G070,G0B1/inc/Fx/stm32g030xx.h
+++ b/G0:G070,G0B1/inc/Fx/stm32g030xx.h
--- a/G0:G070,G0B1/inc/Fx/stm32g031xx.h
+++ b/G0:G070,G0B1/inc/Fx/stm32g031xx.h
--- a/G0:G070,G0B1/inc/Fx/stm32g041xx.h
+++ b/G0:G070,G0B1/inc/Fx/stm32g041xx.h
--- a/G0:G070,G0B1/inc/Fx/stm32g050xx.h
+++ b/G0:G070,G0B1/inc/Fx/stm32g050xx.h
--- a/G0:G070,G0B1/inc/Fx/stm32g051xx.h
+++ b/G0:G070,G0B1/inc/Fx/stm32g051xx.h
--- a/G0:G070,G0B1/inc/Fx/stm32g061xx.h
+++ b/G0:G070,G0B1/inc/Fx/stm32g061xx.h
--- a/G0:G070,G0B1/inc/Fx/stm32g070xx.h
+++ b/G0:G070,G0B1/inc/Fx/stm32g070xx.h
--- a/G0:G070,G0B1/inc/Fx/stm32g071xx.h
+++ b/G0:G070,G0B1/inc/Fx/stm32g071xx.h
--- a/G0:G070,G0B1/inc/Fx/stm32g081xx.h
+++ b/G0:G070,G0B1/inc/Fx/stm32g081xx.h
--- a/Show More
+++ b/Show More