Arduino for STM32

Posted: **Wed Apr 07, 2021 9:33 pm**

Hello everybody,

I am trying to wirte a projet which use the serial1 of the nucleo h743zi2.
I am able to send data but no sucess to receive.

for this serial1, the variant.h gives the following

Code: Select all

  
  PB_7,  //D0 - USART_A_RX
  PB_6,  //D1 - USART_A_TX

but when I look at the PeripheralPin.C in the section for HAL_UART_MODULE I see that the line whith PB_7 is commented
Is it normal or is it an error in this file ? I yes, how is it possible to correct it ?

Thank you

Code: Select all

#ifdef HAL_UART_MODULE_ENABLED
WEAK const PinMap PinMap_UART_RX[] = {
  //  {PA_1,  UART4,   STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_UART4)}, // ETH RMII Ref Clk
  {PA_3,  USART2,  STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART2)},
  //  {PA_8,  UART7,   STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_UART7)}, // USB SOF
  //  {PA_10, LPUART1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF3_LPUART)}, // USB ID
  //  {PA_10, USART1,  STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART1)}, // USB ID
  //  {PA_11, UART4,   STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_UART4)}, // USB DM
  {PB_3,  UART7,   STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_UART7)}, // SWO
  {PB_5,  UART5,   STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF14_UART5)},
  //  {PB_7,  LPUART1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_LPUART)}, // LD2 LED_BLUE (ZI)
  //  {PB_7,  USART1,  STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART1)}, // LD2 LED_BLUE (ZI)

Posted: **Thu Apr 08, 2021 6:33 am**

Hi @jean-luc
this is not an 'error', just it has been commented, probably because a LED is connected. anyway you can use it by redefining the PinMap_UART_RX array as it is a weak one.
simply copy it in your sketch and uncomment.
https://github.com/stm32duino/wiki/wiki ... nmap-array

With the next release all pins will be available.

Posted: **Thu Apr 08, 2021 9:00 pm**

Very interesting answer, I will give a try.

Thanks a lot.

Posted: **Thu Apr 08, 2021 10:41 pm**

Good news, at the end I found the solution with this simple code :

Wondering why correct generic "PeripheralPins.c" is not provided ??????
At least, I learned something today but I could have avoid to spend hours searching for a solution !!!

Code: Select all

const PinMap PinMap_UART_TX[] = {
  {PB_6,  USART1,  STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART1)},
  {PD_5,  USART2,  STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART2)},
  {PD_8,  USART3,  STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART3)}, // STLink TX
  {NC,    NP,    0}
};

const PinMap PinMap_UART_RX[] = {
  {PB_7,  USART1,  STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART1)}, // LD2 LED_BLUE (ZI)
  {PD_6,  USART2,  STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART2)},
  {PD_9,  USART3,  STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART3)}, // STLink RX
  {NC,    NP,    0}
};

HardwareSerial Serial1 (PB7,PB6);

void setup() {
  // initialize both serial ports:
  Serial.begin(115200);
  Serial1.begin(200000);
  Serial.write("bonjour");
}

void loop() {
  if (Serial.available()) {
    int inByte = Serial.read();
    Serial.write(inByte);
    Serial.write(" -\r\n");
    Serial1.write(inByte);
  }

  // read from port 0, send to port 1:
  if (Serial1.available()) {
    int inByte = Serial1.read();
    Serial.write(" @ ");
    Serial.write(inByte);
    Serial.write(" +\r\n");
  }
}

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