From 7f9057b65c0642548154c15fd38698cb8839ccf3 Mon Sep 17 00:00:00 2001
From: Edward Emelianov <edward.emelianoff@gmail.com>
Date: Wed, 18 Jan 2023 21:03:56 +0300
Subject: [PATCH] change F303's Makefile to version control; fixed bugs in F303
 usb ringbuffer, add two buffers like in F0x2

---
 F3:F303/PL2303/Makefile            |  69 +++++++++---
 F3:F303/PL2303/main.c              |  52 +++------
 F3:F303/PL2303/pl2303.bin          | Bin 8092 -> 7432 bytes
 F3:F303/PL2303/pl2303.cflags       |   1 +
 F3:F303/PL2303/pl2303.config       |   7 ++
 F3:F303/PL2303/pl2303.creator      |   1 +
 F3:F303/PL2303/pl2303.creator.user | 171 +++++++++++++++++++++++++++++
 F3:F303/PL2303/pl2303.cxxflags     |   1 +
 F3:F303/PL2303/pl2303.files        |  15 +++
 F3:F303/PL2303/pl2303.includes     |   6 +
 F3:F303/PL2303/proto.c             |   6 +-
 F3:F303/PL2303/ringbuffer.c        | 128 +++++++++++++--------
 F3:F303/PL2303/ringbuffer.h        |  20 ++--
 F3:F303/PL2303/usb.c               | 133 ++++++++++++++++------
 F3:F303/PL2303/usb.h               |  16 ++-
 F3:F303/PL2303/version.inc         |   2 +
 F3:F303/floatPrintf/Makefile       |  19 +++-
 F3:F303/floatPrintf/float.bin      | Bin 10984 -> 10544 bytes
 F3:F303/floatPrintf/main.c         |   2 +-
 F3:F303/inc/Fx/stm32f3.h           |  65 ++++++-----
 F3:F303/inc/Fx/vector.h            |   2 +
 F3:F303/inc/startup/vector.c       |   2 +
 22 files changed, 544 insertions(+), 174 deletions(-)
 create mode 100644 F3:F303/PL2303/pl2303.cflags
 create mode 100644 F3:F303/PL2303/pl2303.config
 create mode 100644 F3:F303/PL2303/pl2303.creator
 create mode 100644 F3:F303/PL2303/pl2303.creator.user
 create mode 100644 F3:F303/PL2303/pl2303.cxxflags
 create mode 100644 F3:F303/PL2303/pl2303.files
 create mode 100644 F3:F303/PL2303/pl2303.includes
 create mode 100644 F3:F303/PL2303/version.inc

diff --git a/F3:F303/PL2303/Makefile b/F3:F303/PL2303/Makefile
index f725d8c..1903586 100644
--- a/F3:F303/PL2303/Makefile
+++ b/F3:F303/PL2303/Makefile
@@ -9,12 +9,8 @@ MCU			?= F303xb
 ARMARCH = __ARM_ARCH_7M__
 # change this linking script depending on particular MCU model,
 LDSCRIPT	?= stm32f303xB.ld
-# debug
-#DEFS		= -DEBUG
 
-INDEPENDENT_HEADERS=
-
-FP_FLAGS	?= -mfpu=fpv4-sp-d16 -mfloat-abi=softfp -fsingle-precision-constant -mlittle-endian -DARM_MATH_CM4
+FP_FLAGS	?= -mfpu=fpv4-sp-d16 -mfloat-abi=hard -fsingle-precision-constant -mlittle-endian -DARM_MATH_CM4
 ASM_FLAGS	?= -mthumb -mcpu=cortex-m4
 ARCH_FLAGS	= $(ASM_FLAGS) $(FP_FLAGS) -D $(ARMARCH)
 
@@ -42,6 +38,10 @@ DFUUTIL		:= $(shell which dfu-util)
 ###############################################################################
 # Source files
 OBJDIR 		:= mk
+# target (debug/release)
+TARGFILE := $(OBJDIR)/TARGET
+# autoincremental version & build date
+VERSION_FILE = version.inc
 SRC			:= $(wildcard *.c)
 OBJS		:= $(addprefix $(OBJDIR)/, $(SRC:%.c=%.o))
 STARTUP		:= $(OBJDIR)/startup.o
@@ -59,16 +59,15 @@ LIB_DIR		:= $(INC_DIR)/ld
 # C flags
 CFLAGS		+= -g -gdwarf-2   # debuggin symbols in listing
 CFLAGS		+= -O2 -D__thumb2__=1 -MD
-CFLAGS		+= -Wall -Werror -Wextra -Wshadow 
+CFLAGS		+= -Wall -Wextra -Wshadow 
 CFLAGS		+= -fshort-enums -ffunction-sections -fdata-sections
-#CFLAGS		+= -fno-common -ffunction-sections -fdata-sections -fno-stack-protector
+#CFLAGS		+= -fno-common -fno-stack-protector
 CFLAGS		+=  $(ARCH_FLAGS)
 
 ###############################################################################
 # Linker flags
-#LDFLAGS		+= -nostartfiles --static -nostdlib  -specs=nosys.specs -specs=nano.specs
+LDFLAGS		+= -nostartfiles --static -specs=nosys.specs -specs=nano.specs
 LDFLAGS		+= $(ARCH_FLAGS)
-LDFLAGS		+= -specs=nano.specs -specs=nosys.specs
 LDFLAGS		+= -L$(LIB_DIR) 
 #-L$(TOOLCHLIB)
 LDFLAGS		+= -T$(LDSCRIPT)
@@ -76,7 +75,7 @@ LDFLAGS		+= -Wl,-Map=$(MAP),--cref -Wl,--gc-sections -Wl,--print-memory-usage
 
 ###############################################################################
 # Used libraries
-#LDLIBS		+=  -lc $(shell $(CC) $(CFLAGS) -print-libgcc-file-name)
+LDLIBS		+= -lm -lc $(shell $(CC) $(CFLAGS) -print-libgcc-file-name)
 
 DEFS		+= -DSTM32$(FAMILY) -DSTM32$(MCU)
 
@@ -85,7 +84,36 @@ LIST	:= $(OBJDIR)/$(BINARY).list
 BIN		:= $(BINARY).bin
 HEX		:= $(BINARY).hex
 
-all: bin list size
+ifeq ($(shell test -e $(TARGFILE) && echo -n yes),yes)
+	TARGET := $(file < $(TARGFILE))
+else
+	TARGET := RELEASE
+endif
+
+ifeq ($(TARGET), DEBUG)
+	.DEFAULT_GOAL := debug
+endif
+
+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)
+
+# release: add LTO
+release: CFLAGS += -flto
+release: LDFLAGS += -flto
+release: $(TARGFILE) bin list size
+
+#debug: add debug flags
+debug: CFLAGS += -DEBUG -Werror -g3
+debug: TARGET := DEBUG
+debug: $(TARGFILE) bin list size
+
+$(TARGFILE): $(OBJDIR)
+	@echo -e "\t\tTARGET: $(TARGET)"
+	@echo "$(TARGET)" > $(TARGFILE)
 
 elf: $(ELF)
 bin: $(BIN)
@@ -102,6 +130,14 @@ $(OBJDIR):
 $(STARTUP): $(INC_DIR)/startup/vector.c
 	$(CC) $(CFLAGS) $(DEFS) $(INCLUDE) -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)\"/" $(VERSION_FILE)
+
+$(OBJDIR)/proto.o: proto.c $(VERSION_FILE)
+
 $(OBJDIR)/%.o: %.c
 	@echo "  CC      $<"
 	$(CC) $(CFLAGS) $(DEFS) $(INCLUDE) -o $@ -c $<
@@ -127,8 +163,7 @@ size: $(ELF)
 
 clean:
 	@echo "  CLEAN"
-	$(RM) $(OBJS) $(DEPS) $(ELF) $(HEX) $(LIST) $(MAP)
-	@rmdir $(OBJDIR) 2>/dev/null || true
+	@rm -rf $(OBJDIR) 2>/dev/null || true
 
 
 flash: $(BIN)
@@ -143,4 +178,10 @@ dfuboot: $(BIN)
 	@echo "  LOAD  $(BIN) THROUGH DFU"
 	$(DFUUTIL) -a0 -D $(BIN) -s 0x08000000
 
-.PHONY: clean flash boot
+openocd:
+	openocd -f openocd.cfg
+
+dbg:
+	arm-none-eabi-gdb $(ELF) -ex 'target remote localhost:3333' -ex 'monitor reset halt'
+
+.PHONY: size clean flash boot dfuboot openocd dbg
diff --git a/F3:F303/PL2303/main.c b/F3:F303/PL2303/main.c
index 887503d..6f9c39b 100644
--- a/F3:F303/PL2303/main.c
+++ b/F3:F303/PL2303/main.c
@@ -21,7 +21,7 @@
 #include "usart.h"
 #include "usb.h"
 
-#define USBBUFSZ    127
+#define MAXSTRLEN    RBINSZ
 
 const char *test = "123456789A123456789B123456789C123456789D123456789E123456789F123456789G123456789H123456789I123456789J123456789K123456789L123456789M123456789N123456789O123456789P123456789Q123456789R123456789S123456789T123456789U123456789V123456789W123456789X123456789Y\n"
         "123456789A123456789B123456789C123456789D123456789E123456789F123456789G123456789H123456789I123456789J123456789K123456789L123456789M123456789N123456789O123456789P123456789Q123456789R123456789S123456789T123456789U123456789V123456789W123456789X123456789Y\n";
@@ -32,28 +32,8 @@ void sys_tick_handler(void){
     ++Tms;
 }
 
-// usb getline
-char *get_USB(){
-    static char tmpbuf[USBBUFSZ+1], *curptr = tmpbuf;
-    static int rest = USBBUFSZ;
-    uint8_t x = USB_receive(curptr);
-    if(!x) return NULL;
-    curptr[x] = 0;
-    if(curptr[x-1] == '\n'){
-        curptr = tmpbuf;
-        rest = USBBUFSZ;
-        return tmpbuf;
-    }
-    curptr += x; rest -= x;
-    if(rest <= 0){ // buffer overflow
-        curptr = tmpbuf;
-        rest = USBBUFSZ;
-        USB_send("USB buffer overflow\n");
-    }
-    return NULL;
-}
-
 int main(void){
+    char inbuff[MAXSTRLEN+1];
     int hse = 0;
     if(StartHSE()){
         hse = 1;
@@ -85,20 +65,24 @@ int main(void){
             const char *ans = parse_cmd(txt);
             if(ans) usart_send(ans);
         }
-        usb_proc();
-        if((txt = get_USB())){
-            usart_send("Get by USB: ");
-            usart_send(txt); usart_putchar('\n');
-            const char *ans = parse_cmd(txt);
-            if(ans) USB_send(ans);
-        }
-        if(Tlast){
-            usart_send("Tlast="); usart_send(u2str(Tlast)); usart_putchar('\n');
-            Tlast = 0;
+        USB_proc();
+        int l = USB_receivestr(inbuff, MAXSTRLEN);
+        if(l < 0) USB_sendstr("ERROR: USB buffer overflow or string was too long\n");
+        else if(l){
+            usart_send("Get by USB ");
+            usart_send(u2str(l)); usart_send(" bytes:");
+            usart_send(inbuff); usart_putchar('\n');
+            const char *ans = parse_cmd(inbuff);
+            if(ans) USB_sendstr(ans);
         }
         if(starttest){
-            --starttest;
-            USB_send(test);
+            USB_sendstr(test);
+            if(0 == --starttest){
+#define SENDBOTH(x) do{char *_ = x; usart_send(_); USB_sendstr(_);}while(0)
+                SENDBOTH("ENDT=");
+                SENDBOTH(u2str(Tms));
+                usart_putchar('\n'); USB_putbyte('\n');
+            }
         }
     }
 }
diff --git a/F3:F303/PL2303/pl2303.bin b/F3:F303/PL2303/pl2303.bin
index 00fde62181e435a6226d97f96507245a317847f5..4cb469a490fc195c7e6c0f65e91d78de19d567d3 100755
GIT binary patch
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diff --git a/F3:F303/PL2303/pl2303.cflags b/F3:F303/PL2303/pl2303.cflags
new file mode 100644
index 0000000..68d5165
--- /dev/null
+++ b/F3:F303/PL2303/pl2303.cflags
@@ -0,0 +1 @@
+-std=c17
\ No newline at end of file
diff --git a/F3:F303/PL2303/pl2303.config b/F3:F303/PL2303/pl2303.config
new file mode 100644
index 0000000..1cf1964
--- /dev/null
+++ b/F3:F303/PL2303/pl2303.config
@@ -0,0 +1,7 @@
+// Add predefined macros for your project here. For example:
+// #define THE_ANSWER 42
+#define EBUG
+#define STM32F3
+#define STM32F303xb
+#define __thumb2__ 1
+#define __ARM_ARCH_7M__
diff --git a/F3:F303/PL2303/pl2303.creator b/F3:F303/PL2303/pl2303.creator
new file mode 100644
index 0000000..e94cbbd
--- /dev/null
+++ b/F3:F303/PL2303/pl2303.creator
@@ -0,0 +1 @@
+[General]
diff --git a/F3:F303/PL2303/pl2303.creator.user b/F3:F303/PL2303/pl2303.creator.user
new file mode 100644
index 0000000..aa79e75
--- /dev/null
+++ b/F3:F303/PL2303/pl2303.creator.user
@@ -0,0 +1,171 @@
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diff --git a/F3:F303/PL2303/pl2303.cxxflags b/F3:F303/PL2303/pl2303.cxxflags
new file mode 100644
index 0000000..6435dfc
--- /dev/null
+++ b/F3:F303/PL2303/pl2303.cxxflags
@@ -0,0 +1 @@
+-std=c++17
\ No newline at end of file
diff --git a/F3:F303/PL2303/pl2303.files b/F3:F303/PL2303/pl2303.files
new file mode 100644
index 0000000..68d42e7
--- /dev/null
+++ b/F3:F303/PL2303/pl2303.files
@@ -0,0 +1,15 @@
+hardware.c
+hardware.h
+main.c
+proto.c
+proto.h
+ringbuffer.c
+ringbuffer.h
+usart.c
+usart.h
+usb.c
+usb.h
+usb_lib.c
+usb_lib.h
+usbhw.c
+usbhw.h
diff --git a/F3:F303/PL2303/pl2303.includes b/F3:F303/PL2303/pl2303.includes
new file mode 100644
index 0000000..06d1130
--- /dev/null
+++ b/F3:F303/PL2303/pl2303.includes
@@ -0,0 +1,6 @@
+.
+../inc
+../inc/Fx
+../inc/cm
+../inc/ld
+../inc/startup
diff --git a/F3:F303/PL2303/proto.c b/F3:F303/PL2303/proto.c
index 7292ab8..e5e930f 100644
--- a/F3:F303/PL2303/proto.c
+++ b/F3:F303/PL2303/proto.c
@@ -19,6 +19,7 @@
 #include "proto.h"
 #include "usart.h"
 #include "usb.h"
+#include "version.inc"
 
 uint8_t starttest = 50;
 
@@ -153,6 +154,7 @@ char *getnum(const char *txt, uint32_t *N){
 }
 
 const char* helpmsg =
+    "https://github.com/eddyem/stm32samples/tree/master/F3:F303/PL2303 build#" BUILD_NUMBER " @ " BUILD_DATE "\n"
     "'i' - print USB->ISTR state\n"
     "'p' - toggle USB pullup\n"
     "'N' - read number (dec, 0xhex, 0oct, bbin) and show it in decimal\n"
@@ -192,7 +194,7 @@ const char *parse_cmd(const char *buf){
                 else add2buf("on\n");
             break;
             case 'R':
-                USB_send("Soft reset\n");
+                USB_sendstr("Soft reset\n");
                 usart_send("Soft reset\n");
                 NVIC_SystemReset();
             break;
@@ -208,7 +210,7 @@ const char *parse_cmd(const char *buf){
                 add2buf("\n");
             break;
             case 'W':
-                USB_send("Wait for reboot\n");
+                USB_sendstr("Wait for reboot\n");
                 usart_send("Wait for reboot\n");
                 while(1){nop();};
             break;
diff --git a/F3:F303/PL2303/ringbuffer.c b/F3:F303/PL2303/ringbuffer.c
index 6b292ce..d70a9a7 100644
--- a/F3:F303/PL2303/ringbuffer.c
+++ b/F3:F303/PL2303/ringbuffer.c
@@ -16,71 +16,109 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <string.h>
-#include <stm32f3.h>
-
 #include "ringbuffer.h"
-#include "usb.h"
-#include "usb_lib.h"
 
-// ring buffer
-static char ringbuffer[RBSIZE];
-// head - position of first data byte
-// tail - position of last data byte + 1
-// head == tail - empty! So, buffer can't store more than RBSIZE-1 bytes of data!
-static volatile int head = 0, tail = 0;
-
-static int datalen(){
-    if(tail >= head) return (tail - head);
-    else return (RBSIZE - head + tail);
-}
-static int restlen(){
-    return (RBSIZE - 1 - datalen());
+// stored data length
+int RB_datalen(ringbuffer *b){
+    if(b->tail >= b->head) return (b->tail - b->head);
+    else return (b->length - b->head + b->tail);
 }
 
-TRUE_INLINE void incr(volatile int *what, int n){
+/**
+ * @brief RB_hasbyte - check if buffer has given byte stored
+ * @param b - buffer
+ * @param byte - byte to find
+ * @return index if found, -1 if none
+ */
+int RB_hasbyte(ringbuffer *b, uint8_t byte){
+    if(b->head == b->tail) return -1; // no data in buffer
+    int startidx = b->head;
+    if(b->head > b->tail){ //
+        for(int found = b->head; found < b->length; ++found)
+            if(b->data[found] == byte) return found;
+        startidx = 0;
+    }
+    for(int found = startidx; found < b->tail; ++found)
+        if(b->data[found] == byte) return found;
+    return -1;
+}
+
+// poor memcpy
+static void mcpy(uint8_t *targ, const uint8_t *src, int l){
+    while(l--) *targ++ = *src++;
+}
+
+// increment head or tail
+TRUE_INLINE void incr(ringbuffer *b, volatile int *what, int n){
     *what += n;
-    if(*what >= RBSIZE) *what -= RBSIZE;
+    if(*what >= b->length) *what -= b->length;
 }
 
-int RB_read(char s[BLOCKSIZE]){
-    int l = datalen();
+/**
+ * @brief RB_read - read data from ringbuffer
+ * @param b - buffer
+ * @param s - array to write data
+ * @param len - max len of `s`
+ * @return bytes read
+ */
+int RB_read(ringbuffer *b, uint8_t *s, int len){
+    int l = RB_datalen(b);
     if(!l) return 0;
-    if(l > BLOCKSIZE) l = BLOCKSIZE;
-    int _1st = RBSIZE - head;
+    if(l > len) l = len;
+    int _1st = b->length - b->head;
     if(_1st > l) _1st = l;
-    if(_1st > BLOCKSIZE) _1st = BLOCKSIZE;
-    memcpy(s, ringbuffer+head, _1st);
-    if(_1st < BLOCKSIZE && l > _1st){
-        memcpy(s+_1st, ringbuffer, l-_1st);
-        incr(&head, l);
+    if(_1st > len) _1st = len;
+    mcpy(s, b->data + b->head, _1st);
+    if(_1st < len && l > _1st){
+        mcpy(s+_1st, b->data, l - _1st);
+        incr(b, &b->head, l);
         return l;
     }
-    incr(&head ,_1st);
+    incr(b, &b->head, _1st);
     return _1st;
 }
 
-static int addportion(const char *str, int l){
-    int r = restlen();
+/**
+ * @brief RB_readto fill array `s` with data until byte `byte` (with it)
+ * @param b - ringbuffer
+ * @param byte - check byte
+ * @param s - buffer to write data
+ * @param len - length of `s`
+ * @return amount of bytes written (negative, if len<data in buffer)
+ */
+int RB_readto(ringbuffer *b, uint8_t byte, uint8_t *s, int len){
+    int idx = RB_hasbyte(b, byte);
+    if(idx < 0) return 0;
+    int partlen = idx + 1 - b->head;
+    // now calculate length of new data portion
+    if(idx < b->head) partlen += b->length;
+    if(partlen > len) return -RB_read(b, s, len);
+    return RB_read(b, s, partlen);
+}
+
+/**
+ * @brief RB_write - write some data to ringbuffer
+ * @param b - buffer
+ * @param str - data
+ * @param l - length
+ * @return amount of bytes written
+ */
+int RB_write(ringbuffer *b, const uint8_t *str, int l){
+    int r = b->length - 1 - RB_datalen(b); // rest length
     if(l > r) l = r;
     if(!l) return 0;
-    int _1st = RBSIZE - tail;
+    int _1st = b->length - b->tail;
     if(_1st > l) _1st = l;
-    memcpy(ringbuffer+tail, str, _1st);
+    mcpy(b->data + b->tail, str, _1st);
     if(_1st < l){ // add another piece from start
-        memcpy(ringbuffer, str+_1st, l-_1st);
+        mcpy(b->data, str+_1st, l-_1st);
     }
-    incr(&tail, l);
+    incr(b, &b->tail, l);
     return l;
 }
 
-void RB_write(const char *str, int l){
-    if(!str || !*str) return;
-    if(!usbON) return;
-    while(l){
-        send_next();
-        int a = addportion(str, l);
-        l -= a;
-        str += a;
-    }
+// just delete all information in buffer `b`
+void RB_clearbuf(ringbuffer *b){
+    b->head = 0;
+    b->tail = 0;
 }
diff --git a/F3:F303/PL2303/ringbuffer.h b/F3:F303/PL2303/ringbuffer.h
index 3e8f004..df5e3dc 100644
--- a/F3:F303/PL2303/ringbuffer.h
+++ b/F3:F303/PL2303/ringbuffer.h
@@ -20,14 +20,20 @@
 #ifndef RINGBUFFER_H__
 #define RINGBUFFER_H__
 
-#include "usbhw.h"
+#include <stm32f3.h>
 
-// ring buffer size in bytes
-#define RBSIZE      (512)
-// max reading portion size
-#define BLOCKSIZE   (USB_TXBUFSZ)
+typedef struct{
+    uint8_t *data;      // data buffer
+    const int length;   // its length
+    int head;           // head index
+    int tail;           // tail index
+} ringbuffer;
 
-int RB_read(char s[BLOCKSIZE]);
-void RB_write(const char *str, int l);
+int RB_read(ringbuffer *b, uint8_t *s, int len);
+int RB_readto(ringbuffer *b, uint8_t byte, uint8_t *s, int len);
+int RB_hasbyte(ringbuffer *b, uint8_t byte);
+int RB_write(ringbuffer *b, const uint8_t *str, int l);
+int RB_datalen(ringbuffer *b);
+void RB_clearbuf(ringbuffer *b);
 
 #endif // RINGBUFFER_H__
diff --git a/F3:F303/PL2303/usb.c b/F3:F303/PL2303/usb.c
index 3224ddc..68e7f71 100644
--- a/F3:F303/PL2303/usb.c
+++ b/F3:F303/PL2303/usb.c
@@ -23,32 +23,105 @@
 #include "usb.h"
 #include "usb_lib.h"
 
-static char usbbuff[USB_TXBUFSZ]; // temporary buffer for sending data
-static volatile uint8_t tx_succesfull = 1;
-static volatile uint8_t rxNE = 0;
+static uint8_t usbbuff[USB_TXBUFSZ]; // temporary buffer for sending data
+// ring buffers for incoming and outgoing data
+static uint8_t obuf[RBOUTSZ], ibuf[RBINSZ];
+static ringbuffer out = {.data = obuf, .length = RBOUTSZ, .head = 0, .tail = 0};
+static ringbuffer in = {.data = ibuf, .length = RBINSZ, .head = 0, .tail = 0};
+// transmission is succesfull
+static volatile uint8_t bufisempty = 1;
+static volatile uint8_t bufovrfl = 0;
 
-volatile uint32_t Tlast = 0;
-
-void send_next(){
+static void send_next(){
+    if(bufisempty) return;
     static int lastdsz = 0;
-    if(!tx_succesfull) return;
-    int buflen = RB_read(usbbuff);
+    int buflen = RB_read(&out, usbbuff, USB_TXBUFSZ);
     if(!buflen){
-        if(lastdsz) Tlast = Tms;
         if(lastdsz == 64) EP_Write(3, NULL, 0); // send ZLP after 64 bits packet when nothing more to send
         lastdsz = 0;
+        bufisempty = 1;
         return;
     }
-    tx_succesfull = 0;
-    EP_Write(3, (uint8_t*)usbbuff, buflen);
+    EP_Write(3, usbbuff, buflen);
     lastdsz = buflen;
 }
 
+// blocking send full content of ring buffer
+int USB_sendall(){
+    while(!bufisempty){
+        if(!usbON) return 0;
+    }
+    return 1;
+}
+
 // put `buf` into queue to send
-void USB_send(const char *buf){
-    int len = strlen(buf);
-    if(!usbON || !len) return;
-    RB_write(buf, len); // this is a blocking procedure if there's too little free memory in buffer
+int USB_send(const uint8_t *buf, int len){
+    if(!buf || !usbON || !len) return 0;
+    while(len){
+        int a = RB_write(&out, buf, len);
+        len -= a;
+        buf += a;
+        if(bufisempty){
+            bufisempty = 0;
+            send_next();
+        }
+    }
+    return 1;
+}
+
+int USB_putbyte(uint8_t byte){
+    if(!usbON) return 0;
+    while(0 == RB_write(&out, &byte, 1)){
+        if(bufisempty){
+            bufisempty = 0;
+            send_next();
+        }
+    }
+    return 1;
+}
+
+int USB_sendstr(const char *string){
+    if(!string || !usbON) return 0;
+    int len = 0;
+    const char *b = string;
+    while(*b++) ++len;
+    if(!len) return 0;
+    return USB_send((const uint8_t*)string, len);
+}
+
+/**
+ * @brief USB_receive - get binary data from receiving ring-buffer
+ * @param buf (i) - buffer for received data
+ * @param len - length of `buf`
+ * @return amount of received bytes (negative, if overfull happened)
+ */
+int USB_receive(uint8_t *buf, int len){
+    int sz = RB_read(&in, buf, len);
+    if(bufovrfl){
+        RB_clearbuf(&in);
+        if(!sz) sz = -1;
+        else sz = -sz;
+        bufovrfl = 0;
+    }
+    return sz;
+}
+
+/**
+ * @brief USB_receivestr - get string up to '\n' and replace '\n' with 0
+ * @param buf - receiving buffer
+ * @param len - its length
+ * @return strlen or negative value indicating overflow (if so, string won't be ends with 0 and buffer should be cleared)
+ */
+int USB_receivestr(char *buf, int len){
+    int l = RB_readto(&in, '\n', (uint8_t*)buf, len);
+    if(l < 0 || bufovrfl) RB_clearbuf(&in);
+    else buf[l] = 0; // replace '\n' with strend
+    if(bufovrfl){
+        if(l > 0) l = -l;
+        else l = -1;
+        bufovrfl = 0;
+    }
+    return l;
 }
 
 // interrupt IN handler (never used?)
@@ -63,7 +136,6 @@ static void EP1_Handler(){
 
 // data IN/OUT handlers
 static void transmit_Handler(){ // EP3IN
-    tx_succesfull = 1;
     uint16_t epstatus = KEEP_DTOG_STAT(USB->EPnR[3]);
     // clear CTR keep DTOGs & STATs
     USB->EPnR[3] = (epstatus & ~(USB_EPnR_CTR_TX)); // clear TX ctr
@@ -71,12 +143,17 @@ static void transmit_Handler(){ // EP3IN
 }
 
 static void receive_Handler(){ // EP2OUT
-    rxNE = 1;
-    uint16_t epstatus = KEEP_DTOG_STAT(USB->EPnR[2]);
-    USB->EPnR[2] = (epstatus & ~(USB_EPnR_CTR_RX)); // clear RX ctr
+    uint8_t buf[USB_RXBUFSZ];
+    uint16_t epstatus = KEEP_DTOG(USB->EPnR[2]);
+    uint8_t sz = EP_Read(2, (uint16_t*)buf);
+    if(sz){
+        if(RB_write(&in, buf, sz) != sz) bufovrfl = 1;
+    }
+    // keep stat_tx & set ACK rx, clear RX ctr
+    USB->EPnR[2] = (epstatus & ~USB_EPnR_CTR_RX) ^ USB_EPnR_STAT_RX;
 }
 
-void usb_proc(){
+void USB_proc(){
     switch(USB_Dev.USB_Status){
         case USB_STATE_CONFIGURED:
             // make new BULK endpoint
@@ -94,21 +171,5 @@ void usb_proc(){
         break;
         default: // USB_STATE_CONNECTED - send next data portion
             if(!usbON) return;
-            send_next();
     }
 }
-
-/**
- * @brief USB_receive
- * @param buf (i) - buffer[64] for received data
- * @return amount of received bytes
- */
-int USB_receive(char *buf){
-    if(!usbON || !rxNE) return 0;
-    int sz = EP_Read(2, (uint16_t*)buf);
-    uint16_t epstatus = KEEP_DTOG(USB->EPnR[2]);
-    // keep stat_tx & set ACK rx
-    USB->EPnR[2] = (epstatus & ~(USB_EPnR_STAT_TX)) ^ USB_EPnR_STAT_RX;
-    rxNE = 0;
-    return sz;
-}
diff --git a/F3:F303/PL2303/usb.h b/F3:F303/PL2303/usb.h
index cc697b7..15d1172 100644
--- a/F3:F303/PL2303/usb.h
+++ b/F3:F303/PL2303/usb.h
@@ -22,13 +22,17 @@
 
 #include "usbhw.h"
 
-#define BUFFSIZE   (64)
+// sizes of ringbuffers for outgoing and incoming data
+#define RBOUTSZ     (512)
+#define RBINSZ      (512)
 
-extern volatile uint32_t Tlast;
+void USB_proc();
+int USB_sendall();
+int USB_send(const uint8_t *buf, int len);
+int USB_putbyte(uint8_t byte);
+int USB_sendstr(const char *string);
+int USB_receive(uint8_t *buf, int len);
+int USB_receivestr(char *buf, int len);
 
-void usb_proc();
-void send_next();
-void USB_send(const char *buf);
-int USB_receive(char *buf);
 
 #endif // __USB_H__
diff --git a/F3:F303/PL2303/version.inc b/F3:F303/PL2303/version.inc
new file mode 100644
index 0000000..44a91c7
--- /dev/null
+++ b/F3:F303/PL2303/version.inc
@@ -0,0 +1,2 @@
+#define BUILD_NUMBER "14"
+#define BUILD_DATE "2023-01-18"
diff --git a/F3:F303/floatPrintf/Makefile b/F3:F303/floatPrintf/Makefile
index 0e78c99..bc5af43 100644
--- a/F3:F303/floatPrintf/Makefile
+++ b/F3:F303/floatPrintf/Makefile
@@ -10,8 +10,6 @@ ARMARCH = __ARM_ARCH_7M__
 # change this linking script depending on particular MCU model,
 LDSCRIPT	?= stm32f303xB.ld
 
-INDEPENDENT_HEADERS=
-
 FP_FLAGS	?= -mfpu=fpv4-sp-d16 -mfloat-abi=hard -fsingle-precision-constant -mlittle-endian -DARM_MATH_CM4
 ASM_FLAGS	?= -mthumb -mcpu=cortex-m4
 ARCH_FLAGS	= $(ASM_FLAGS) $(FP_FLAGS) -D $(ARMARCH)
@@ -42,6 +40,8 @@ DFUUTIL		:= $(shell which dfu-util)
 OBJDIR 		:= mk
 # target (debug/release)
 TARGFILE := $(OBJDIR)/TARGET
+# autoincremental version & build date
+VERSION_FILE = version.inc
 SRC			:= $(wildcard *.c)
 OBJS		:= $(addprefix $(OBJDIR)/, $(SRC:%.c=%.o))
 STARTUP		:= $(OBJDIR)/startup.o
@@ -94,6 +94,13 @@ ifeq ($(TARGET), DEBUG)
 	.DEFAULT_GOAL := debug
 endif
 
+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)
+
 # release: add LTO
 release: CFLAGS += -flto
 release: LDFLAGS += -flto
@@ -123,6 +130,14 @@ $(OBJDIR):
 $(STARTUP): $(INC_DIR)/startup/vector.c
 	$(CC) $(CFLAGS) $(DEFS) $(INCLUDE) -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)\"/" $(VERSION_FILE)
+
+#$(OBJDIR)/proto.o: proto.c $(VERSION_FILE)
+
 $(OBJDIR)/%.o: %.c
 	@echo "  CC      $<"
 	$(CC) $(CFLAGS) $(DEFS) $(INCLUDE) -o $@ -c $<
diff --git a/F3:F303/floatPrintf/float.bin b/F3:F303/floatPrintf/float.bin
index bb8f6ccd0d30667fbceb4832a98120dfa8d138c3..69e092b07af882431140c913eb781bdfb8f0773f 100755
GIT binary patch
delta 686
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BFB$*<

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F{{b<B#|!`f

diff --git a/F3:F303/floatPrintf/main.c b/F3:F303/floatPrintf/main.c
index 6c51198..683d6dc 100644
--- a/F3:F303/floatPrintf/main.c
+++ b/F3:F303/floatPrintf/main.c
@@ -101,7 +101,7 @@ NAN, INFINITY, -INFINITY};
 #define TESTN 12
 
 int main(void){
-    sysreset();
+//    sysreset();
     if(!StartHSE()) StartHSI();
     SysTick_Config((uint32_t)72000); // 1ms
     hw_setup();
diff --git a/F3:F303/inc/Fx/stm32f3.h b/F3:F303/inc/Fx/stm32f3.h
index b2a6e69..e6b1b15 100644
--- a/F3:F303/inc/Fx/stm32f3.h
+++ b/F3:F303/inc/Fx/stm32f3.h
@@ -32,15 +32,7 @@
 
 #define VECT_TAB_OFFSET  0x0 /*!< Vector Table base offset field.
                                   This value must be a multiple of 0x200. */
-/*
-TRUE_INLINE void enable_FPU(){
-    SCB->CPACR |= ((3UL << 10*2)|(3UL << 11*2));  // set CP10 and CP11 Full Access
-}*/
-
-//extern uint32_t SystemCoreClock;          /*!< System Clock Frequency (Core Clock) */
-//extern const uint8_t AHBPrescTable[16];   /*!< AHB prescalers table values */
-//extern const uint8_t APBPrescTable[8];    /*!< APB prescalers table values */
-
+#if 0
 /**
   * @brief  Setup the microcontroller system
   *         Initialize the FPU setting, vector table location and the PLL configuration is reset.
@@ -80,52 +72,57 @@ TRUE_INLINE void sysreset(void) // not usable
   SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH */
 #endif
 }
+#endif
 
-TRUE_INLINE void StartHSI(){ // system bus 48MHz from PLL, USBPPRE=1
+#define WAITWHILE(x)  do{StartUpCounter = 0; while((x) && (++StartUpCounter < 3600000)){nop();}}while(0)
+TRUE_INLINE void StartHSI(){ // system bus 48MHz from PLL
     __IO uint32_t StartUpCounter = 0;
-#define WAITWHILE(x)  do{StartUpCounter = 0; while((x) && (++StartUpCounter < 0xffffff)){nop();}}while(0)
-    RCC->CR = (RCC->CR & ~RCC_CR_PLLON) | RCC_CR_HSION;
+    RCC->CR |= RCC_CR_HSION;
     // To adjust HSI set value of HSITRIM here
     WAITWHILE(!(RCC->CR & RCC_CR_HSIRDY));
+    RCC->CFGR &= ~RCC_CFGR_SW; // set sysclock to HSI
+    WAITWHILE(RCC->CFGR & RCC_CFGR_SWS);
+    RCC->CR &= ~(RCC_CR_PLLON | RCC_CR_HSEON);
+    WAITWHILE(RCC->CR & RCC_CR_PLLRDY); // wait while PLL will be off
     FLASH->ACR = (FLASH->ACR & ~(FLASH_ACR_LATENCY)) |
-            FLASH_ACR_LATENCY_0 | FLASH_ACR_PRFTBE;
-    RCC->CFGR = (RCC->CFGR & ~(RCC_CFGR_HPRE | RCC_CFGR_PPRE1 | RCC_CFGR_PPRE2 |
-                               RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLMUL | RCC_CFGR_USBPRE)
-                 ) | RCC_CFGR_PLLSRC_HSI_DIV2 | RCC_CFGR_PLLMUL12 | RCC_CFGR_USBPRE_DIV1;
+            FLASH_ACR_LATENCY_1 | FLASH_ACR_PRFTBE;
+    RCC->CFGR = RCC_CFGR_PLLSRC_HSI_DIV2 | RCC_CFGR_PLLMUL12 | RCC_CFGR_USBPRE_DIV1 | RCC_CFGR_PPRE1_DIV2;
     RCC->CR |= RCC_CR_PLLON; // Enable PLL
     // Wait till PLL is ready
     WAITWHILE(!(RCC->CR & RCC_CR_PLLRDY));
     // Select PLL as system clock source
     RCC->CFGR = (RCC->CFGR & ~RCC_CFGR_SW) | RCC_CFGR_SW_PLL;
     // Wait till PLL is used as system clock source
-    WAITWHILE((RCC->CFGR & RCC_CFGR_SWS) != RCC_CFGR_SWS_1);
-#undef WAITWHILE
+    WAITWHILE((RCC->CFGR & RCC_CFGR_SWS) != RCC_CFGR_SWS_PLL);
+    SysFreq = 48000000;
 }
 
 // @return 1 if OK, 0 if failed
 TRUE_INLINE int StartHSE(){ // system bus 72MHz from PLL
     __IO uint32_t StartUpCounter = 0;
-#define WAITWHILE(x)  do{StartUpCounter = 0; while((x) && (++StartUpCounter < 0xffffff)){nop();}; if(x) return 0;}while(0)
-    RCC->CR = (RCC->CR & ~RCC_CR_PLLON) | RCC_CR_HSEON; // disable PLL to reconfigure, enable HSE
+    RCC->CFGR &= ~RCC_CFGR_SW; // set sysclock to HSI
+    WAITWHILE(RCC->CFGR & RCC_CFGR_SWS);
+    RCC->CR &= ~RCC_CR_PLLON;
+    WAITWHILE(RCC->CR & RCC_CR_PLLRDY); // wait while PLL will be off
+    RCC->CR |= RCC_CR_HSEON; // disable PLL to reconfigure, enable HSE
     WAITWHILE(!(RCC->CR & RCC_CR_HSERDY));
     // Enable Prefetch Buffer. Flash 4 wait states for 48..72MHz
     FLASH->ACR = (FLASH->ACR & ~(FLASH_ACR_LATENCY)) |
             FLASH_ACR_LATENCY_2 | FLASH_ACR_PRFTBE;
-    // HCLK = SYSCLK (AHB prescaler = 1), PCLK1 = HCLK (APB1 prescaler = 1), PCLK2 = HCLK (APB2 prescaler = 1)
-    // PLLCLK = HSE * 9 = 72MHz
-    RCC->CFGR = (RCC->CFGR & ~(RCC_CFGR_HPRE | RCC_CFGR_PPRE1 | RCC_CFGR_PPRE2 |
-                               RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLMUL | RCC_CFGR_USBPRE)
-                 ) | RCC_CFGR_PLLSRC_HSE_PREDIV | RCC_CFGR_PLLMUL9 | RCC_CFGR_USBPRE_DIV1_5;
+    // HCLK = SYSCLK (AHB prescaler = 1), PCLK1 = HCLK/2 (APB1 prescaler = 2, max freq = 36MHz),
+    // PCLK2 = HCLK (APB2 prescaler = 1), PLLCLK = HSE * 9 = 72MHz
+    RCC->CFGR = RCC_CFGR_PLLSRC_HSE_PREDIV | RCC_CFGR_PLLMUL9 | RCC_CFGR_PPRE1_DIV2;
     RCC->CR |= RCC_CR_PLLON; // Enable PLL
     // Wait till PLL is ready
     WAITWHILE(!(RCC->CR & RCC_CR_PLLRDY));
     // Select PLL as system clock source
     RCC->CFGR = (RCC->CFGR & ~RCC_CFGR_SW) | RCC_CFGR_SW_PLL;
     // Wait till PLL is used as system clock source
-    WAITWHILE((RCC->CFGR & RCC_CFGR_SWS) != RCC_CFGR_SWS_1);
-#undef WAITWHILE
+    WAITWHILE((RCC->CFGR & RCC_CFGR_SWS) != RCC_CFGR_SWS_PLL);
+    SysFreq = 72000000;
     return 1;
 }
+#undef WAITWHILE
 
 /*******************  Bit definition for GPIO_MODER register  *****************/
 // _AI - analog inpt, _O - general output, _AF - alternate function
@@ -251,6 +248,20 @@ TRUE_INLINE int StartHSE(){ // system bus 72MHz from PLL
 #define GPIO_OSPEEDR15_MED          ((uint32_t)(1<<30))
 #define GPIO_OSPEEDR15_HIGH         ((uint32_t)(3<<30))
 
+// clear MODER: ~GPIO_MODER_MODERXX_Msk, you should AND these
+#define MODER_CLR(n)    (~(3<<(n*2)))
+// _AI - analog inpt, _O - general output, _AF - alternate function
+// these should be OR'ed
+#define MODER_I(n)      (0)
+#define MODER_O(n)      (1<<(n*2))
+#define MODER_AF(n)     (2<<(n*2))
+#define MODER_AI(n)     (3<<(n*2))
+
+// AFR field: afr - AFR number, pin - pin (0..15)
+TRUE_INLINE uint32_t AFRf(uint8_t afr, uint8_t pin){
+    if(pin > 7) pin -= 8;
+    return (afr << (pin * 4));
+}
 
 /************************* ADC *************************/
 /* inner termometer calibration values
diff --git a/F3:F303/inc/Fx/vector.h b/F3:F303/inc/Fx/vector.h
index 1ab96f1..78fdc52 100644
--- a/F3:F303/inc/Fx/vector.h
+++ b/F3:F303/inc/Fx/vector.h
@@ -25,6 +25,8 @@
 #ifndef WEAK
 #define WEAK __attribute__((weak))
 #endif
+#include <stdint.h>
+extern uint32_t SysFreq;
 
 void WEAK reset_handler(void);
 void WEAK nmi_handler(void);
diff --git a/F3:F303/inc/startup/vector.c b/F3:F303/inc/startup/vector.c
index 6a908a8..b566483 100644
--- a/F3:F303/inc/startup/vector.c
+++ b/F3:F303/inc/startup/vector.c
@@ -19,6 +19,8 @@
  */
 #include "vector.h"
 
+uint32_t SysFreq = 0;
+
 typedef void (*vector_table_entry_t)(void);
 typedef void (*funcp_t) (void);