STM32 MCU realizes serial port 1 (115200) to receive/send data to serial port 2 (9600) at the same time

柯小西

STM32 MCU realizes serial port 1 (115200) to receive/send data to serial port 2 (9600) at the same time [Copy link]

stm32g030 chip

Implement the function of sending data from serial port 1 to serial port 2 and receiving data from serial port 2 at the same time

Serial port 2 sends data to serial port 1 and receives data from serial port 1 at the same time

It is possible to send data from 9600 (serial port 2) to serial port 1 (115200), and serial port 1 can receive the data completely.

Serial port 1 (115200) sends data to serial port 2 (9600), but the data is not received correctly. Is there any incorrect configuration or

main.c

while (1)
{
/* USER CODE END WHILE */

if(HAL_UART_Receive_IT(&huart2,USART2_RX_BUF,1) == HAL_OK)
{

HAL_UART_Transmit(&huart1,USART2_RX_BUF,sizeof(USART2_RX_BUF),100);
}

if(HAL_UART_Receive_IT(&huart1,USART1_RX_BUF,1) == HAL_OK)
{

HAL_UART_Transmit (&huart2,USART1_RX_BUF ,sizeof(USART1_RX_BUF),100);
}

/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}

Callback Function

void HAL_UART_RXCpltCallback(UART_HandleTypeDef *huart)
{
if(huart ->Instance == USART2)
{
HAL_UART_Transmit(&huart1,USART2_RX_BUF,1,100);
HAL_UART_Receive_IT(&huart2,USART2_RX_BUF,1);

}

if(huart ->Instance == USART1)
{
HAL_UART_ Transmit (&huart2,USART1_RX_BUF,1,100);
HAL_UART_Receive_IT(&huart1,USART1_RX_BUF,1);
}
}

usart.c

Add enable in usart initialization

/*Enable the uart data register not empty interrupt*/
__HAL_UART_ENABLE_IT(&huart2,UART_IT_RXNE);
//__HAL_UART_ENABLE_IT(&huart2,UART_IT_TXE);
/*Enable the uart parity error interrupt*/
__HAL_UART_ENABLE_IT(&huart2,UART_IT_PE);
/*Enable the uart error interrtupt:(Frame error,noise error,overrun error)*/
__HAL_UART_ENABLE_IT(&huart2,UART_IT_ERR);

wangerxian

In what scenario is this used? Is it transparent?

柯小西

wangerxian posted on 2022-7-1 16:53 In what scenario is this applied? Is it transparent?

Yes

littleshrimp

I don't understand your question. Do you want to realize that two serial ports of a microcontroller can send and receive messages to each other? And the communication is between different resolutions?

inkinessray

This is so strange! Why is the baud rate different?