两个STM32进行串口通信的代码

这是一个基本的 STM32 串口通信的代码示例：

发送端代码：

#include "stm32f10x.h"
#include "stm32f10x_usart.h"
#include "stm32f10x_gpio.h"
#include "misc.h"

UART_HandleTypeDef UART_HandleStruct;

void UART_Config(void)
{
  /* 初始化串口1引脚 */
  GPIO_InitTypeDef GPIO_InitStructure;
  USART_InitTypeDef USART_InitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_USART1, ENABLE);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; // TX
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; // RX
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  USART_InitStructure.USART_BaudRate = 115200;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;

  USART_Init(USART1, &USART_InitStructure);

  NVIC_InitTypeDef NVIC_InitStruct;
  NVIC_InitStruct.NVIC_IRQChannel = USART1_IRQn;
  NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStruct);

  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);

  USART_Cmd(USART1, ENABLE);
}

void LED_Config(void)
{
  /* 初始化LED引脚 */
  GPIO_InitTypeDef GPIO_InitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
}

void USART1_IRQHandler(void)
{
  if (USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
  {
    uint16_t ch;
    ch = USART_ReceiveData(USART1);
    if (ch == '1') // 接收到数字 1 时打开 LED
    {
      GPIO_SetBits(GPIOB, GPIO_Pin_0);
    }
    else if (ch == '0') // 接收到数字 0 时关闭 LED
    {
      GPIO_ResetBits(GPIOB, GPIO_Pin_0);
    }
  }
}

int main(void)
{
  HAL_Init();
  LED_Config();
  UART_Config();
  while (1)
  {
  }
}

接收端代码：

#include "stm32f10x.h"
#include "stm32f10x_usart.h"
#include "stm32f10x_gpio.h"
#include "misc.h"

UART_HandleTypeDef UART_HandleStruct;

void UART_Config(void)
{
  /* 初始化串口1引脚 */
  GPIO_InitTypeDef GPIO_InitStructure;
  USART_InitTypeDef USART_InitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_USART1, ENABLE);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; // TX
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; // RX
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  USART_InitStructure.USART_BaudRate = 115200;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;

  USART_Init(USART1, &USART_InitStructure);

  NVIC_InitTypeDef NVIC_InitStruct;
  NVIC_InitStruct.NVIC_IRQChannel = USART1_IRQn;
  NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStruct);

  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);

  USART_Cmd(USART1, ENABLE);
}

void LED_Config(void)
{
  /* 初始化LED引脚 */
  GPIO_InitTypeDef GPIO_InitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
}

void USART1_IRQHandler(void)
{
  if (USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
  {
    uint16_t ch;
    ch = USART_ReceiveData(USART1);
    if (ch == '1') // 接收到数字 1 时打开 LED
    {
      GPIO_SetBits(GPIOB, GPIO_Pin_0);
    }
    else if (ch == '0') // 接收到数字 0 时关闭 LED
    {
      GPIO_ResetBits(GPIOB, GPIO_Pin_0);
    }
  }
}

int main(void)
{
  HAL_Init();
  LED_Config();
  UART_Config();
  while (1)
  {
  }
}

这两个代码可以直接在两个STM32上分别编译烧录，互相串口连接后即可进行通信。