From 65c9ae34bc0409c8ec8d083ee0a7e3b62231a48d Mon Sep 17 00:00:00 2001
From: Edward Emelianov <edward.emelianoff@gmail.com>
Date: Sat, 14 Mar 2026 01:16:00 +0300
Subject: [PATCH] USART almost working (but hangs on long messages)

---
 F0:F030,F042,F072/usbcan_gpio/Makefile        |   8 +-
 F0:F030,F042,F072/usbcan_gpio/canproto.c      |   6 +-
 F0:F030,F042,F072/usbcan_gpio/gpio.c          |  12 +-
 F0:F030,F042,F072/usbcan_gpio/gpio.h          |  26 ----
 F0:F030,F042,F072/usbcan_gpio/gpioproto.cpp   | 129 +++++++++++++++---
 F0:F030,F042,F072/usbcan_gpio/gpioproto.h     |   1 +
 F0:F030,F042,F072/usbcan_gpio/hardware.c      |   6 +-
 F0:F030,F042,F072/usbcan_gpio/main.c          |   1 +
 F0:F030,F042,F072/usbcan_gpio/usart.c         |  63 ++++-----
 F0:F030,F042,F072/usbcan_gpio/usbcangpio.bin  | Bin 22652 -> 23876 bytes
 .../usbcan_gpio/usbcangpio.creator.user       |   2 +-
 F0:F030,F042,F072/usbcan_gpio/version.inc     |   4 +-
 12 files changed, 162 insertions(+), 96 deletions(-)

diff --git a/F0:F030,F042,F072/usbcan_gpio/Makefile b/F0:F030,F042,F072/usbcan_gpio/Makefile
index f9d8d4b..2bb8a42 100644
--- a/F0:F030,F042,F072/usbcan_gpio/Makefile
+++ b/F0:F030,F042,F072/usbcan_gpio/Makefile
@@ -1,10 +1,10 @@
 BINARY      := usbcangpio
 # MCU code
-#MCU         := F072xB
-MCU          := F042x6
+MCU         := F072xB
+#MCU          := F042x6
 # change this linking script depending on particular MCU model,
-#LDSCRIPT    := stm32f072xB.ld
-LDSCRIPT     := stm32f042x6.ld
+LDSCRIPT    := stm32f072x8.ld
+#LDSCRIPT     := stm32f042x6.ld
 
 DEFINES := -DUSB2_16
 
diff --git a/F0:F030,F042,F072/usbcan_gpio/canproto.c b/F0:F030,F042,F072/usbcan_gpio/canproto.c
index cacfe94..012a8f1 100644
--- a/F0:F030,F042,F072/usbcan_gpio/canproto.c
+++ b/F0:F030,F042,F072/usbcan_gpio/canproto.c
@@ -387,8 +387,10 @@ static void CommandParser(char *txt){
         break;
 #ifdef STM32F072xB
         case 'D':
-            USB_sendstr("Go into DFU mode\n");
-            USB_sendall();
+            SEND("Go into DFU mode\n");
+            USB_sendall(ICAN);
+            uint32_t t = Tms;
+            while(Tms - t < 2000){IWDG->KR = IWDG_REFRESH;}
             Jump2Boot();
         break;
 #endif
diff --git a/F0:F030,F042,F072/usbcan_gpio/gpio.c b/F0:F030,F042,F072/usbcan_gpio/gpio.c
index 83215e3..ff86226 100644
--- a/F0:F030,F042,F072/usbcan_gpio/gpio.c
+++ b/F0:F030,F042,F072/usbcan_gpio/gpio.c
@@ -27,13 +27,6 @@
 static uint16_t monitor_mask[2] = {0}; // pins to monitor == 1 (ONLY GPIO and ADC)
 static uint16_t oldstates[2][16] = {0}; // previous state (16 bits - as some pins could be analog)
 
-// strings for keywords
-const char *str_keywords[] = {
-#define KW(x)    [STR_ ## x] = #x,
-    KEYWORDS
-#undef KW
-};
-
 // intermediate buffer to change pin's settings by user request; after checking in will be copied to the_conf
 static pinconfig_t pinconfig[2][16] = {0};
 static uint8_t pinconfig_notinited = 1; // ==0 after first memcpy from the_conf to pinconfig
@@ -207,7 +200,8 @@ int chkpinconf(){
     }
     // now check USART configuration
     if(active_usart != -1){
-        if(chkusartconf(&UC)) ret = FALSE;
+        UC.idx = active_usart;
+        if(!chkusartconf(&UC)) ret = FALSE;
     }else{
         get_defusartconf(&UC); // clear global configuration
         the_conf.usartconfig = UC;
@@ -318,7 +312,7 @@ int gpio_reinit(){
                 int shift4 = pin << 4;
                 gpio->AFR[0] = (gpio->AFR[0] & ~(0xf << shift4)) | (cfg->afno << shift4);
             }else{
-                int shift4 = (pin - 8) << 4;
+                int shift4 = (pin - 8) << 2;
                 gpio->AFR[1] = (gpio->AFR[1] & ~(0xf << shift4)) | (cfg->afno << shift4);
             }
             if(cfg->monitor && cfg->mode != MODE_AF){
diff --git a/F0:F030,F042,F072/usbcan_gpio/gpio.h b/F0:F030,F042,F072/usbcan_gpio/gpio.h
index d4cfc54..b66eef5 100644
--- a/F0:F030,F042,F072/usbcan_gpio/gpio.h
+++ b/F0:F030,F042,F072/usbcan_gpio/gpio.h
@@ -99,32 +99,6 @@ typedef struct{
 } spiconfig_t;
 */
 
-// strings for keywords
-extern const char *str_keywords[];
-#define KEYWORDS \
-KW(AIN) \
-KW(IN) \
-KW(OUT) \
-KW(AF) \
-KW(PU)\
-KW(PD) \
-KW(FL) \
-KW(PP) \
-KW(OD) \
-KW(USART) \
-KW(SPI) \
-KW(I2C) \
-KW(MONITOR) \
-KW(THRESHOLD) \
-KW(SPEED) \
-KW(TEXT)
-
-enum{ // indexes of string keywords
-#define KW(k) STR_ ## k,
-    KEYWORDS
-#undef KW
-};
-
 int is_disabled(uint8_t port, uint8_t pin);
 int chkpinconf();
 
diff --git a/F0:F030,F042,F072/usbcan_gpio/gpioproto.cpp b/F0:F030,F042,F072/usbcan_gpio/gpioproto.cpp
index 23a3ab1..41611bb 100644
--- a/F0:F030,F042,F072/usbcan_gpio/gpioproto.cpp
+++ b/F0:F030,F042,F072/usbcan_gpio/gpioproto.cpp
@@ -25,7 +25,6 @@ extern "C"{
 #include "adc.h"
 #include "can.h"
 #include "flash.h"
-#include "gpioproto.h"
 #include "gpio.h"
 #include "gpioproto.h"
 #include "usart.h"
@@ -36,6 +35,10 @@ extern "C"{
 
 extern volatile uint32_t Tms;
 
+static uint8_t curbuf[MAXSTRLEN]; // buffer for receiving data from USART etc
+
+static uint8_t usart_text = 0; // ==1 for text USART proto
+
 // TODO: add analog threshold!
 
 // list of all commands and handlers
@@ -56,9 +59,8 @@ extern volatile uint32_t Tms;
     COMMAND(setiface,   "set/get name of interface x (0 - CAN, 1 - GPIO)") \
     COMMAND(storeconf,  "save config to flash") \
     COMMAND(time,       "show current time (ms)") \
-    COMMAND(vdd,        "get approx Vdd value (V*100)")
-
-//    COMMAND(USART,      "Read USART data or send (USART=hex)")
+    COMMAND(vdd,        "get approx Vdd value (V*100)") \
+    COMMAND(USART,      "Read USART data or send (USART=hex)")
 //    COMMAND(usartconf,  "set USART params (e.g. usartconf=115200 8N1)")
 //    COMMAND(SPI,        "Read SPI data or send (SPI=hex)")
 //    COMMAND(spiconf,    "set SPI params")
@@ -99,7 +101,42 @@ enum MiscValues{
     MISC_MONITOR = 1,
     MISC_THRESHOLD,
     MISC_SPEED,
-    MISC_TEXT
+    MISC_TEXT,
+    MISC_BIN
+};
+
+// TODO: add HEX input?
+
+#define KEYWORDS \
+KW(AIN) \
+    KW(IN) \
+    KW(OUT) \
+    KW(AF) \
+    KW(PU)\
+    KW(PD) \
+    KW(FL) \
+    KW(PP) \
+    KW(OD) \
+    KW(USART) \
+    KW(SPI) \
+    KW(I2C) \
+    KW(MONITOR) \
+    KW(THRESHOLD) \
+    KW(SPEED) \
+    KW(TEXT) \
+    KW(BIN) \
+
+    enum{ // indexes of string keywords
+#define KW(k) STR_ ## k,
+        KEYWORDS
+#undef KW
+    };
+
+// strings for keywords
+static const char *str_keywords[] = {
+#define KW(x)    [STR_ ## x] = #x,
+    KEYWORDS
+#undef KW
 };
 
 static const Keyword keywords[] = {
@@ -120,17 +157,19 @@ static const Keyword keywords[] = {
     KEY(THRESHOLD, GROUP_MISC,  MISC_THRESHOLD)
     KEY(SPEED, GROUP_MISC, MISC_SPEED)
     KEY(TEXT, GROUP_MISC, MISC_TEXT)
+    KEY(BIN, GROUP_MISC, MISC_BIN)
 #undef K
 };
 #define NUM_KEYWORDS (sizeof(keywords)/sizeof(keywords[0]))
 
 static const char* errtxt[ERR_AMOUNT] = {
-    [ERR_OK]       = "OK",
-    [ERR_BADCMD]   = "BADCMD",
-    [ERR_BADPAR]   = "BADPAR",
-    [ERR_BADVAL]   = "BADVAL",
-    [ERR_WRONGLEN] = "WRONGLEN",
-    [ERR_CANTRUN]  = "CANTRUN",
+    [ERR_OK]        = "OK",
+    [ERR_BADCMD]    = "BADCMD",
+    [ERR_BADPAR]    = "BADPAR",
+    [ERR_BADVAL]    = "BADVAL",
+    [ERR_WRONGLEN]  = "WRONGLEN",
+    [ERR_CANTRUN]   = "CANTRUN",
+    [ERR_BUSY]      = "BUSY",
 };
 
 static const char *pinhelp =
@@ -141,6 +180,9 @@ static const char *pinhelp =
     "  FUNC: USART or SPI (enable alternate function and configure peripheal)\n"
     "  MISC: MONITOR - send data by USB as only state changed\n"
     "        THRESHOLD (ADC only) - monitoring threshold, ADU\n"
+    "        SPEED - interface speed/frequency\n"
+    "        TEXT - USART means data as text ('\n'-separated strings)\n"
+    "        BIN - USART means data as binary (output: HEX)\n"
     "\n"
     ;
 
@@ -197,7 +239,10 @@ static bool argsvals(char *args, int32_t *parno, int32_t *parval){
 // `PAx = ` also printed there
 static void pin_getter(uint8_t port, uint8_t pin){
     int16_t val = pin_in(port, pin);
-    if(val < 0) SENDn(errtxt[ERR_CANTRUN]);
+    if(val < 0){
+        SENDn(errtxt[ERR_CANTRUN]);
+        return;
+    }
     SEND(port == 0 ? "PA" : "PB"); SEND(u2str((uint32_t)pin)); SEND(EQ);
     SENDn(u2str((uint32_t)val));
 }
@@ -284,6 +329,9 @@ static errcodes_t pin_setter(uint8_t port, uint8_t pin, char *setter){
                     case MISC_TEXT: // what to do, if textproto is set, but user wants binary?
                         UsartConf.textproto = 1;
                         break;
+                    case MISC_BIN: // clear text flag
+                        UsartConf.textproto = 0;
+                        break;
                     }
                     break;
                 }
@@ -342,7 +390,13 @@ static errcodes_t cmd_PB(const char *cmd, char *args){
 }
 
 static errcodes_t cmd_reinit(const char _U_ *cmd, char _U_ *args){
-    if(gpio_reinit()) return ERR_OK;
+    if(gpio_reinit()){
+        usartconf_t UC;
+        if(get_curusartconf(&UC)){
+            usart_text = UC.textproto;
+        }
+        return ERR_OK;
+    }
     SEND("Can't reinit: check your configuration!\n");
     return ERR_AMOUNT;
 }
@@ -573,6 +627,44 @@ static errcodes_t cmd_help(const char _U_ *cmd, char _U_ *args){
     return ERR_AMOUNT;
 }
 
+static int sendfun(const char *s){
+    if(!s) return 0;
+    return USB_sendstr(IGPIO, s);
+}
+
+static void sendusartdata(const uint8_t *buf, int len){
+    if(!buf || len < 1) return;
+    SEND(str_keywords[STR_USART]); SEND(EQ);
+    if(usart_text){
+        USB_send(IGPIO, curbuf, len);
+        if(curbuf[len-1] != '\n') NL();
+    }else{
+        NL();
+        hexdump(sendfun, (uint8_t*)curbuf, len);
+    }
+}
+
+static errcodes_t cmd_USART(const char _U_ *cmd, char *args){
+    if(!args) return ERR_BADVAL;
+    char *setter = splitargs(args, NULL);
+    if(setter){
+        DBG("Try to send over USART\n");
+        int l = strlen(setter);
+        if(usart_text){ // add '\n' as we removed it @ parser
+            if(setter[l-1] != '\n') setter[l++] = '\n';
+        }
+        l = usart_send((uint8_t*)setter, l);
+        if(l < 0) return ERR_BUSY;
+        else if(l == 0) return ERR_CANTRUN;
+        return ERR_OK;
+    } // getter: try to read
+    int l = usart_receive(curbuf, MAXSTRLEN);
+    if(l < 0) return ERR_CANTRUN;
+    if(l > 0) sendusartdata(curbuf, l);
+    // or silence: nothing to read
+    return ERR_AMOUNT;
+}
+
 constexpr uint32_t hash(const char* str, uint32_t h = 0){
     return *str ? hash(str + 1, h + ((h << 7) ^ *str)) : h;
 }
@@ -599,9 +691,8 @@ static const char *CommandParser(char *str){
 }
 
 void GPIO_process(){
-    char inbuff[MAXSTRLEN];
-    int l = RECV(inbuff, MAXSTRLEN);
-    // TODO: check SPI/USART/I2C
+    int l;
+    // TODO: check SPI/I2C etc
     for(uint8_t port = 0; port < 2; ++port){
         uint16_t alert = gpio_alert(port);
         if(alert == 0) continue;
@@ -610,11 +701,13 @@ void GPIO_process(){
             if(alert & pinmask) pin_getter(port, i);
         }
     }
-  usart_process(NULL, 0);
+    l = usart_process(curbuf, MAXSTRLEN);
+    if(l > 0) sendusartdata(curbuf, l);
+    l = RECV((char*)curbuf, MAXSTRLEN);
     if(l == 0) return;
     if(l < 0) SEND("ERROR: USB buffer overflow or string was too long\n");
     else{
-        const char *ans = CommandParser(inbuff);
+        const char *ans = CommandParser((char*)curbuf);
         if(ans) SENDn(ans);
     }
 }
diff --git a/F0:F030,F042,F072/usbcan_gpio/gpioproto.h b/F0:F030,F042,F072/usbcan_gpio/gpioproto.h
index 6f5478e..2facea9 100644
--- a/F0:F030,F042,F072/usbcan_gpio/gpioproto.h
+++ b/F0:F030,F042,F072/usbcan_gpio/gpioproto.h
@@ -26,6 +26,7 @@ typedef enum{
     ERR_BADVAL,     // wrong value (for setter)
     ERR_WRONGLEN,   // wrong message length
     ERR_CANTRUN,    // can't run given command due to bad parameters or other
+    ERR_BUSY,       // target interface busy, try later
     ERR_AMOUNT      // amount of error codes or "send nothing"
 } errcodes_t;
 
diff --git a/F0:F030,F042,F072/usbcan_gpio/hardware.c b/F0:F030,F042,F072/usbcan_gpio/hardware.c
index 4b9e796..45f312d 100644
--- a/F0:F030,F042,F072/usbcan_gpio/hardware.c
+++ b/F0:F030,F042,F072/usbcan_gpio/hardware.c
@@ -34,9 +34,9 @@ TRUE_INLINE void gpio_setup(){ // setup some common GPIO
 
 void hardware_setup(){
     // enable all active GPIO clocking
-    RCC->AHBENR |= RCC_AHBENR_GPIOAEN | RCC_AHBENR_GPIOBEN;
-    RCC->APB1ENR |= RCC_APB2ENR_USART1EN;
-    RCC->APB2ENR |= RCC_APB1ENR_USART2EN;
+    RCC->AHBENR |= RCC_AHBENR_GPIOAEN | RCC_AHBENR_GPIOBEN | RCC_AHBENR_DMA1EN;
+    RCC->APB2ENR |= RCC_APB2ENR_USART1EN | RCC_APB2ENR_SYSCFGEN;
+    RCC->APB1ENR |= RCC_APB1ENR_USART2EN;
     gpio_setup();
     //gpio_reinit();
     adc_setup();
diff --git a/F0:F030,F042,F072/usbcan_gpio/main.c b/F0:F030,F042,F072/usbcan_gpio/main.c
index 0d2e39e..56e6659 100644
--- a/F0:F030,F042,F072/usbcan_gpio/main.c
+++ b/F0:F030,F042,F072/usbcan_gpio/main.c
@@ -32,6 +32,7 @@ void sys_tick_handler(void){
 int main(void){
     sysreset();
     SysTick_Config(6000, 1);
+    StartHSE();
     flashstorage_init();
     hardware_setup();
     USB_setup();
diff --git a/F0:F030,F042,F072/usbcan_gpio/usart.c b/F0:F030,F042,F072/usbcan_gpio/usart.c
index fa572e4..85be3a6 100644
--- a/F0:F030,F042,F072/usbcan_gpio/usart.c
+++ b/F0:F030,F042,F072/usbcan_gpio/usart.c
@@ -32,8 +32,8 @@
 static uint8_t  inbuffer[DMARXBUFSZ];   // DMA in buffer
 static uint8_t  rbbuffer[RXRBSZ];       // for in ringbuffer
 static uint8_t  outbuffer[DMATXBUFSZ];  // DMA out buffer
-static uint8_t  TXrdy = 1;              // TX DMA ready
-static uint8_t  RXrdy = 0;              // == 1 when got IDLE or '\n' (only when `monitoring` is on
+static volatile uint8_t  TXrdy = 1;     // TX DMA ready
+static volatile uint8_t  RXrdy = 0;     // == 1 when got IDLE or '\n' (only when `monitoring` is on
 static uint8_t  textformat = 0;         // out by '\n'-terminated lines
 static uint8_t  monitor = 0;            // monitor USART rx
 static int      dma_read_idx = 0;       // start of data in DMA inbuffers
@@ -108,18 +108,19 @@ int usart_config(usartconf_t *uc){
     // Assuming oversampling by 16 (default after reset). For higher baud rates you might use by 8.
     U->BRR = peripheral_clock / (usartconfig.speed);
     usartconfig.speed= peripheral_clock / U->BRR; // fix for real speed
-    uint32_t cr1 = 0;
-    // format: 8N1, so CR2 used only for character match (if need)
-    if(usartconfig.monitor){
-        if(usartconfig.textproto){
-            U->CR2 = USART_CR2_ADD_VAL('\n');
-            cr1 |= USART_CR1_CMIE;
-        }else cr1 |= USART_CR1_IDLEIE; // monitor binary data by IDLE flag
-    }
+    uint32_t cr1 = 0, cr3 = 0;
     textformat = usartconfig.textproto;
     monitor = usartconfig.monitor;
     // Enable transmitter, receiver, and interrupts (optional)
-    if(usartconfig.RXen) cr1 |= USART_CR1_RE;
+    if(usartconfig.RXen){
+        cr1 |= USART_CR1_RE;
+        cr3 |= USART_CR3_DMAR;
+        // format: 8N1, so CR2 used only for character match (if need)
+        if(usartconfig.textproto){
+            U->CR2 = USART_CR2_ADD_VAL('\n'); // buffer text data by EOL
+            cr1 |= USART_CR1_CMIE;
+        }else cr1 |= USART_CR1_IDLEIE; // buffer binary data by IDLE flag
+    }
     if(usartconfig.TXen){
         cr1 |= USART_CR1_TE;
         // DMA Tx
@@ -127,9 +128,11 @@ int usart_config(usartconf_t *uc){
         T->CCR = 0;
         T->CPAR = (uint32_t) &U->TDR;
         T->CCR = DMA_CCR_MINC | DMA_CCR_DIR | DMA_CCR_TCIE;
+        cr3 |= USART_CR3_DMAT;
     }
     // Main config
     U->CR1 = cr1;
+    U->CR3 = cr3;
     curUSARTidx = No;
     // all OK -> copy to global config
     the_conf.usartconfig = usartconfig;
@@ -140,26 +143,21 @@ int usart_config(usartconf_t *uc){
 int usart_start(){
     if(curUSARTidx == -1) return FALSE;
     volatile USART_TypeDef *U = Usarts[curUSARTidx];
-    if(monitor) NVIC_EnableIRQ(UIRQs[curUSARTidx]);
+    NVIC_EnableIRQ(UIRQs[curUSARTidx]); // copy to ring buffer after each '\n' in text mode or IDLE in binary
     NVIC_EnableIRQ(DMA1_Channel4_5_IRQn);
     // reset Rx DMA
     if(U->CR1 & USART_CR1_RE){
         volatile DMA_Channel_TypeDef *R = DMA1_Channel5;
         dma_read_idx = 0;
         R->CCR = 0;
-        R->CPAR = (uint32_t) U->RDR;
+        RB_clearbuf(&RBin);
+        R->CPAR = (uint32_t) &U->RDR;
         R->CMAR = (uint32_t) inbuffer;
         R->CNDTR = DMARXBUFSZ;
         R->CCR = DMA_CCR_MINC | DMA_CCR_CIRC | DMA_CCR_EN;
-        RB_clearbuf(&RBin);
     }
     U->CR1 |= USART_CR1_UE; // enable USARTx
     U->ICR = 0xFFFFFFFF;   // Clear flags
-    // Wait for the idle frame to complete (optional)
-    uint32_t tmout = 16000000;
-    while(!(U->ISR & USART_ISR_TC)){
-        if (--tmout == 0) break;
-    }
     TXrdy = 1;
     return TRUE;
 }
@@ -208,33 +206,36 @@ int usart_process(uint8_t *buf, int len){
     if(curUSARTidx == -1 || !(Usarts[curUSARTidx]->CR1 & USART_CR1_UE)) return -1; // none activated or started
     int ret = 0; // returned value
     // Input data
-    int write_idx = DMARXBUFSZ - DMA1_Channel5->CNDTR; // next symbol to be written
+    int remained = DMA1_Channel5->CNDTR;
+    int write_idx = DMARXBUFSZ - remained; // next symbol to be written
     int available = (write_idx - dma_read_idx); // length of data available
+    int monitored_len = available;
+    uint8_t locmonitor = monitor; // if `buf` not pointed, set this flag to zero
     if(available < 0) available += DMARXBUFSZ; // write to the left of read
     if(available){
-        if(RXrdy){
+        if(locmonitor){
             if(buf && len > 0){
-                if(len < available) available = len;
-            }else RXrdy = 0;
+                if(len < monitored_len) monitored_len = len;
+            }else locmonitor = 0;
         }
         // TODO: force copying data to "async" buffer in case of overflow danger
         if(available >= (DMARXBUFSZ/2) || RXrdy){ // enough data or lonely couple of bytes but need to show
             // copy data in one or two chunks (wrap handling)
             int wrOK = FALSE;
             if(dma_read_idx + available <= DMARXBUFSZ){ // head before tail
-                if(RXrdy){
-                    memcpy(buf, &inbuffer[dma_read_idx], available);
-                    ret = available;
+                if(locmonitor){
+                    memcpy(buf, &inbuffer[dma_read_idx], monitored_len);
+                    ret = monitored_len;
                     wrOK = TRUE;
                 }else{
                     if(available == RB_write(&RBin, &inbuffer[dma_read_idx], available)) wrOK = TRUE;
                 }
             }else{ // head after tail - two chunks
                 int first = DMARXBUFSZ - dma_read_idx;
-                if(RXrdy){
+                if(locmonitor){
                     memcpy(buf, &inbuffer[dma_read_idx], first);
-                    memcpy(buf, inbuffer, available - first);
-                    ret = available;
+                    memcpy(buf, inbuffer, monitored_len - first);
+                    ret = monitored_len;
                     wrOK = TRUE;
                 }else{
                     if((first == RB_write(&RBin, &inbuffer[dma_read_idx], first)) &&
@@ -297,9 +298,9 @@ static void usart_isr(){
 }
 
 void dma1_channel4_5_isr(){ // TX ready, channel5
-    if(DMA1->ISR & DMA_ISR_TCIF5){
+    if(DMA1->ISR & DMA_ISR_TCIF4){
         TXrdy = 1;
-        DMA1->IFCR = DMA_IFCR_CTCIF5;
+        DMA1->IFCR = DMA_IFCR_CTCIF4;
         DMA1_Channel4->CCR &= ~DMA_CCR_EN; // disable DMA channel until next send
     }
 }
diff --git a/F0:F030,F042,F072/usbcan_gpio/usbcangpio.bin b/F0:F030,F042,F072/usbcan_gpio/usbcangpio.bin
index e41fd58ea5a2eea3861349fd8ec01f7879db8834..ed09300fa3a5033de5b4ca23e9897138cc034b06 100755
GIT binary patch
delta 14154
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diff --git a/F0:F030,F042,F072/usbcan_gpio/usbcangpio.creator.user b/F0:F030,F042,F072/usbcan_gpio/usbcangpio.creator.user
index b138528..aa40037 100644
--- a/F0:F030,F042,F072/usbcan_gpio/usbcangpio.creator.user
+++ b/F0:F030,F042,F072/usbcan_gpio/usbcangpio.creator.user
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE QtCreatorProject>
-<!-- Written by QtCreator 18.0.2, 2026-03-13T00:12:36. -->
+<!-- Written by QtCreator 18.0.2, 2026-03-14T01:13:52. -->
 <qtcreator>
  <data>
   <variable>EnvironmentId</variable>
diff --git a/F0:F030,F042,F072/usbcan_gpio/version.inc b/F0:F030,F042,F072/usbcan_gpio/version.inc
index 1100d14..2c30622 100644
--- a/F0:F030,F042,F072/usbcan_gpio/version.inc
+++ b/F0:F030,F042,F072/usbcan_gpio/version.inc
@@ -1,2 +1,2 @@
-#define BUILD_NUMBER "156"
-#define BUILD_DATE "2026-03-12"
+#define BUILD_NUMBER "173"
+#define BUILD_DATE "2026-03-14"