c语言编写串口通信程序

下面是一个简单的C语言程序，用于在Windows平台上通过串口进行通信。该程序使用了Windows API函数来实现串口通信。

#include <stdio.h>
#include <windows.h>

int main()
{
    HANDLE hSerial;
    DCB dcbSerialParams = {0};
    COMMTIMEOUTS timeouts = {0};
    char buffer[1024];
    DWORD bytesRead;

    // 打开串口
    hSerial = CreateFile("COM1", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    if (hSerial == INVALID_HANDLE_VALUE)
    {
        printf("Error opening serial port\n");
        return 1;
    }

    // 配置串口参数
    dcbSerialParams.DCBlength = sizeof(dcbSerialParams);
    if (!GetCommState(hSerial, &dcbSerialParams))
    {
        printf("Error getting serial port state\n");
        CloseHandle(hSerial);
        return 1;
    }
    dcbSerialParams.BaudRate = CBR_9600;
    dcbSerialParams.ByteSize = 8;
    dcbSerialParams.StopBits = ONESTOPBIT;
    dcbSerialParams.Parity = NOPARITY;
    if (!SetCommState(hSerial, &dcbSerialParams))
    {
        printf("Error setting serial port state\n");
        CloseHandle(hSerial);
        return 1;
    }

    // 设置读取超时时间
    timeouts.ReadIntervalTimeout = 50;
    timeouts.ReadTotalTimeoutConstant = 50;
    timeouts.ReadTotalTimeoutMultiplier = 10;
    timeouts.WriteTotalTimeoutConstant = 50;
    timeouts.WriteTotalTimeoutMultiplier = 10;
    if (!SetCommTimeouts(hSerial, &timeouts))
    {
        printf("Error setting timeouts\n");
        CloseHandle(hSerial);
        return 1;
    }

    // 读取串口数据并输出
    while (1)
    {
        if (ReadFile(hSerial, buffer, sizeof(buffer), &bytesRead, NULL))
        {
            printf("%.*s", bytesRead, buffer);
        }
    }

    // 关闭串口
    CloseHandle(hSerial);
    return 0;
}

此程序打开了一个名为"COM1"的串口，并通过该串口读取数据。你可以根据自己的需要修改程序中的串口名称、波特率、数据位、停止位和校验位等参数。同时，也可以根据需要修改程序来发送数据到串口。