stm32串口通信程序

你好，以下是一个基于 STM32 的串口通信程序示例：

#include "stm32f4xx.h"

void USART_Config(void)
{
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);

    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;

    GPIO_Init(GPIOA, &GPIO_InitStructure);

    USART_InitTypeDef USART_InitStructure;
    USART_InitStructure.USART_BaudRate = 9600;
    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_Rx | USART_Mode_Tx;

    USART_Init(USART1, &USART_InitStructure);

    USART_Cmd(USART1, ENABLE);
}

void SendChar(char c)
{
    while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET)
    {
    }

    USART_SendData(USART1, c);
}

void SendString(char *str)
{
    while (*str)
    {
        SendChar(*str++);
    }
}

uint8_t ReceiveChar(void)
{
    while (USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET)
    {
    }

    return (USART_ReceiveData(USART1) & 0xff);
}

int main(void)
{
    USART_Config();

    while (1)
    {
        SendString("Hello, world!\r\n");
        uint8_t c = ReceiveChar();
        SendString("Received character: ");
        SendChar(c);
        SendString("\r\n");
    }

    return 0;
}

这里使用了 STM32F4xx 系列芯片的 USART1 模块进行串口通信。串口配置使用了 9600 波特率、无奇偶校验和停止位为 1 的格式，同时使能了接收和发送功能。在主循环中，首先发送了一段字符串，然后接收一个字符，并将其打印到串口上。