两个stm32串口通信

在STM32上，你可以使用两个UART串口进行通信。以下是基于HAL库的示例代码：

#include "stm32f4xx_hal.h"
#include <string.h>

/* UART1 Configuration */
UART_HandleTypeDef huart1;
void MX_USART1_UART_Init(void)
{
  huart1.Instance = USART1;
  huart1.Init.BaudRate = 115200;
  huart1.Init.WordLength = UART_WORDLENGTH_8B;
  huart1.Init.StopBits = UART_STOPBITS_1;
  huart1.Init.Parity = UART_PARITY_NONE;
  huart1.Init.Mode = UART_MODE_TX_RX;
  huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart1.Init.OverSampling = UART_OVERSAMPLING_16;
  if (HAL_UART_Init(&huart1) != HAL_OK)
  {
    Error_Handler();
  }
}

/* UART2 Configuration */
UART_HandleTypeDef huart2;
void MX_USART2_UART_Init(void)
{
  huart2.Instance = USART2;
  huart2.Init.BaudRate = 115200;
  huart2.Init.WordLength = UART_WORDLENGTH_8B;
  huart2.Init.StopBits = UART_STOPBITS_1;
  huart2.Init.Parity = UART_PARITY_NONE;
  huart2.Init.Mode = UART_MODE_TX_RX;
  huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart2.Init.OverSampling = UART_OVERSAMPLING_16;
  if (HAL_UART_Init(&huart2) != HAL_OK)
  {
    Error_Handler();
  }
}

int main(void)
{
  char tx_buffer[32];
  char rx_buffer[32];

  /* Initialize UART1 and UART2 */
  HAL_Init();
  MX_USART1_UART_Init();
  MX_USART2_UART_Init();

  while (1)
  {
    /* Transmit data over UART1 */
    sprintf(tx_buffer, "UART1: Hello UART2!\r\n");
    HAL_UART_Transmit(&huart1, (uint8_t*)tx_buffer, strlen(tx_buffer), 1000);

    /* Receive data from UART2 */
    HAL_UART_Receive(&huart2, (uint8_t*)rx_buffer, 32, 1000);
    if (strlen(rx_buffer) > 0)
    {
      /* Print received data */
      sprintf(tx_buffer, "UART2: Received message: %s\r\n", rx_buffer);
      HAL_UART_Transmit(&huart1, (uint8_t*)tx_buffer, strlen(tx_buffer), 1000);
    }

    HAL_Delay(1000);
  }
}

该示例程序中使用了UART1和UART2，其中UART1发送消息到UART2，UART2接收UART1的消息并将其回传。你可以根据需要更改代码以满足自己的要求。