restructuring

F1:F103/led_blink/Makefile

@@ -0,0 +1,137 @@
+BINARY		= blink
+BOOTPORT	?= /dev/ttyUSB0
+BOOTSPEED	?= 115200
+# MCU FAMILY
+FAMILY		?= F1
+# MCU code
+MCU			?= F103xB
+# density (stm32f10x.h, lines 70-84)
+DENSITY 	?= MD
+# change this linking script depending on particular MCU model,
+LDSCRIPT	?= stm32f103xB.ld
+# debug
+DEFS		= -DEBUG
+
+INDEPENDENT_HEADERS=
+
+FP_FLAGS	?= -msoft-float
+ASM_FLAGS	?= -mthumb -mcpu=cortex-m3 
+ARCH_FLAGS	= $(ASM_FLAGS) $(FP_FLAGS)
+
+###############################################################################
+# Executables
+#PREFIX		?= arm-none-eabi
+# gcc from arm web site 
+PREFIX		?= /opt/bin/arm-none-eabi
+RM			:= rm -f
+RMDIR		:= rmdir
+CC			:= $(PREFIX)-gcc
+# don't replace ld with gcc: the binary size would be much greater!!
+LD			:= $(PREFIX)-ld
+AR			:= $(PREFIX)-ar
+AS			:= $(PREFIX)-as
+SIZE 		:= $(PREFIX)-size
+OBJCOPY		:= $(PREFIX)-objcopy
+OBJDUMP		:= $(PREFIX)-objdump
+GDB			:= $(PREFIX)-gdb
+STFLASH		:= $(shell which st-flash)
+STBOOT		:= $(shell which stm32flash)
+DFUUTIL		:= $(shell which dfu-util)
+
+###############################################################################
+# Source files
+OBJDIR 		= mk
+SRC			:= $(wildcard *.c)
+OBJS		:= $(addprefix $(OBJDIR)/, $(SRC:%.c=%.o))
+STARTUP		= $(OBJDIR)/startup.o
+OBJS 		+= $(STARTUP)
+# dependencies: we need them to recompile files if their headers-dependencies changed
+DEPS		:= $(OBJS:.o=.d)
+
+INC_DIR ?= ../inc
+
+INCLUDE 	:= -I$(INC_DIR)/Fx -I$(INC_DIR)/cm
+LIB_DIR		:= $(INC_DIR)/ld
+
+###############################################################################
+# C flags
+CFLAGS		+= -O2 -g -D__thumb2__=1 -MD
+CFLAGS		+= -Wall -Werror -Wextra -Wshadow 
+CFLAGS		+= -fno-common -ffunction-sections -fdata-sections
+
+###############################################################################
+# Linker flags
+LDFLAGS		+= -nostartfiles --static
+LDFLAGS		+= -L$(LIB_DIR)
+LDFLAGS		+= -T$(LDSCRIPT)
+
+###############################################################################
+# Used libraries
+LDLIBS		+= $(shell $(CC) $(CFLAGS) -print-libgcc-file-name)
+
+DEFS		+= -DSTM32$(FAMILY) -DSTM32$(MCU) -DSTM32F10X_$(DENSITY)
+
+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 $<
+
+$(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) $(OBJS) $(LDLIBS) -o $(ELF)
+
+size: $(ELF)
+	$(SIZE) $(ELF)    
+
+clean:
+	@echo "  CLEAN"
+	$(RM) $(OBJS) $(DEPS) $(ELF) $(HEX) $(LIST)
+	@rmdir $(OBJDIR) 2>/dev/null || true
+
+
+flash: $(BIN)
+	@echo "  FLASH  $(BIN)"
+	$(STFLASH) write $(BIN) 0x8000000
+
+boot: $(BIN)
+	@echo "  LOAD $(BIN) through bootloader"
+	$(STBOOT) -b$(BOOTSPEED) $(BOOTPORT) -w $(BIN)
+
+dfuboot: $(BIN)
+	@echo "  LOAD  $(BIN) THROUGH DFU"
+	$(DFUUTIL) -a0 -D $(BIN) -s 0x08000000
+
+.PHONY: clean flash boot

F1:F103/led_blink/README

@@ -0,0 +1,5 @@
+Toggle LEDs (PB8/PB9) on STM32F103 development board depending on buttons PC0,PC1:
+- no buttons pressed == 'SOS' in Morze @ LED D1
+- Button S2 pressed - D1 blinks with period of 5s
+- Button S1 pressed - D2 blinks with period of 1s
+

F1:F103/led_blink/main.c

@@ -0,0 +1,89 @@
+/*
+ * main.c
+ *
+ * Copyright 2018 Edward V. Emelianov <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.
+ */
+
+#include "stm32f1.h"
+
+static volatile uint32_t blink_ctr = 0;
+
+/* Called when systick fires */
+void sys_tick_handler(void){
+    ++blink_ctr;
+}
+
+// SysTick is 24 bit counter, so 16777215 - max value!!!
+// After HSE is ON it works @72MHz (or remove SysTick_CTRL_CLKSOURCE_Msk @ SysTick_Config for 8MHz)
+static void systick_setup(uint32_t xms){
+    static uint32_t curms = 0;
+    if(curms == xms) return;
+    // this function also clears counter so it starts right away
+    SysTick_Config(72000 * xms);
+    curms = xms;
+}
+
+static const uint16_t L[] = {125,100,125,100,125,200, 60,100,60,100,60,200, 125,100,125,100,125, 230};
+
+static void gpio_setup(void){
+    /* Enable clocks to the GPIO subsystems (A&B) */
+    RCC->APB2ENR |= RCC_APB2ENR_IOPBEN | RCC_APB2ENR_IOPCEN;
+    /* Set leds (PB8/PB9) as opendrain output */
+    GPIOB->CRH = CRH(8, CNF_ODOUTPUT|MODE_SLOW) | CRH(9, CNF_ODOUTPUT|MODE_SLOW);
+    /* Set buttons (PC0/1) as inputs with weak pullups */
+    GPIOC->ODR = 3; // pullups for PC0/1
+    GPIOC->CRL = CRL(0, CNF_PUDINPUT|MODE_INPUT) | CRL(1, CNF_PUDINPUT|MODE_INPUT);
+}
+
+int main(){
+    sysreset();
+    StartHSE();
+    gpio_setup();
+    systick_setup(100);
+    uint32_t oldctr = 0xff;
+    pin_clear(GPIOB, 3<<8);
+    /* Do nothing in main loop */
+    while (1){
+        if(pin_read(GPIOC, 1) && pin_read(GPIOC, 2)){ // no buttons present - morze @ LED1 (PB9)
+            if(oldctr != blink_ctr){
+                uint32_t T = blink_ctr % 18;
+                systick_setup(L[T]);
+                if(T & 1) pin_set(GPIOB, 1<<9);
+                else pin_clear(GPIOB, 1<<9);
+                oldctr = blink_ctr;
+            }
+        }else{ // button pressed: turn ON given LED
+            if(pin_read(GPIOC, 1) == 0){ // PC0 pressed (button S2)
+                systick_setup(5);
+                if(blink_ctr - oldctr > 499){
+                    pin_toggle(GPIOB, 1<<9);
+                    oldctr = blink_ctr;
+                }
+            }else pin_set(GPIOB, 1<<9);
+            if(pin_read(GPIOC, 2) == 0){ // PC1 pressed (button S3)
+                systick_setup(1);
+                if(blink_ctr - oldctr > 499){
+                    pin_toggle(GPIOB, 1<<8);
+                    oldctr = blink_ctr;
+                }
+            }else pin_set(GPIOB, 1<<8);
+
+        }
+    }
+}
+