Can you tell me how to set up serial port in keil?

[yjae]

I'm a beginner. I'd appreciate your help.

[LMI2]

Keil is an IDE, it does not really matter. It is like any other project. I recommend using STM32CubeMX tool which you can download for free.

https://www.st.com/en/development-tools/stm32cubemx.html

With it comes several examples and the tool can create a basic project for you.

[yjae]

I have Cubemx. Can you tell me how to specify serial port with Cubemx?

[LMI2]

Just play with the Cube, you will see. It is not hard.

[Tesla DeLorean]

Which serial port on what pins?

You might be better looking at the existing vcom.c code, or the USART/UART examples under the HAL trees for the NUCLEO board.

[yjae]

In the example of p-nucleo-lrwan1 pingpong, I want to add code and set it to UART4 rx, tx . Please help me.

[yjae]

I want to set USART4 on pc10, pc11.

[Tesla DeLorean]

void USART4_Init(void)
{
  static UART_HandleTypeDef UartHandle;
  GPIO_InitTypeDef GPIO_InitStruct;
 
  __USART4_CLK_ENABLE();
  __GPIOC_CLK_ENABLE()
 
  /* UART TX/RX GPIO pin configuration  */
  GPIO_InitStruct.Pin       = GPIO_PIN_10 | GPIO_PIN_11;
  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull      = GPIO_PULLUP;
  GPIO_InitStruct.Speed     = GPIO_SPEED_HIGH;
  GPIO_InitStruct.Alternate = GPIO_AF6_USART4;
 
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
 
  /*## Configure the UART peripheral ######################################*/
  /* Put the USART peripheral in the Asynchronous mode (UART Mode) */
  /* USART4 configured as follow:
      - Word Length = 8 Bits
      - Stop Bit = One Stop bit
      - Parity = No parity
      - BaudRate = 9600 baud
      - Hardware flow control disabled (RTS and CTS signals) */
 
  UartHandle.Instance        = USART4;
 
  UartHandle.Init.BaudRate   = 9600;
  UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
  UartHandle.Init.StopBits   = UART_STOPBITS_1;
  UartHandle.Init.Parity     = UART_PARITY_NONE;
  UartHandle.Init.HwFlowCtl  = UART_HWCONTROL_NONE;
  UartHandle.Init.Mode       = UART_MODE_TX_RX;
 
  if (HAL_UART_Init(&UartHandle) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler();
  }
 
// If you use interrupts
//  HAL_NVIC_SetPriority(USART4_IRQn, 0x1, 0);
//  HAL_NVIC_EnableIRQ(USART4_IRQn);
}

[yjae]

Thank you, but I'd like to use Interrupt but it says 'USART4_IRQn' is not defined. you help me?

[Tesla DeLorean]

L073RZ shares USART4 and 5 interrupts

HAL_NVIC_SetPriority(USART4_5_IRQn, 0x1, 0);

HAL_NVIC_EnableIRQ(USART4_5_IRQn);

..

void USART4_5_IRQHandler(void)

{

..

}