嵌入式STM32 rs232通讯接收程序

以下是一个简单的嵌入式STM32 RS232通讯接收程序的示例：

#include "stm32f10x.h"
#include <stdio.h>

#define BUFSIZE 128

volatile char rx_buffer[BUFSIZE];
volatile int rx_head = 0;
volatile int rx_tail = 0;

void USART1_IRQHandler(void) {
    if (USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) {
        char ch = USART_ReceiveData(USART1);
        rx_buffer[rx_head++] = ch;
        if (rx_head >= BUFSIZE) {
            rx_head = 0;
        }
    }
}

int main(void) {
    USART_InitTypeDef USART_InitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    // Enable clocks for USART and GPIO
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    // Configure USART1 pins
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

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

    // Configure USART1
    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);

    // Enable USART1 RX interrupt
    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);

    // Configure NVIC for USART1 interrupt
    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    // Enable USART1
    USART_Cmd(USART1, ENABLE);

    while (1) {
        if (rx_head != rx_tail) {
            char ch = rx_buffer[rx_tail++];
            if (rx_tail >= BUFSIZE) {
                rx_tail = 0;
            }
            printf("%c", ch);
        }
    }
}

这个程序使用了STM32F10x库，并在PA9和PA10上配置了USART1。在USART1_IRQn中断处理程序中，接收到的字节将被添加到rx_buffer中。在主循环中，如果rx_head和rx_tail不相等，则读取rx_tail位置上的字节并将其打印到终端上。注意，这个程序没有实现任何错误处理或流控制。