WindowsAPI操作串口

 

#include <windows.h>

#include <stdio.h>



int main()

{

    //1.打开串口

    HANDLE hCom;

    hCom = CreateFile("COM1",

        GENERIC_READ|GENERIC_WRITE,

        0,

        NULL,

        OPEN_EXISTING,

        0,

        NULL);

    if (hCom ==(HANDLE)-1 )

        printf("打开串口失败!\n");

    else 

        printf("打开串口成功!\n");



    //2.初始化串口

    DCB dcb;

    GetCommState(hCom, &dcb);

    dcb.BaudRate = 9600;//波特率

    //dcb.fParity = 0;//奇偶校验使能

    dcb.ByteSize = 8;//数据位

    dcb.Parity = NOPARITY;//奇偶校验

    dcb.StopBits = ONESTOPBIT;//停止位

    SetCommState(hCom, &dcb);



    SetupComm(hCom, 1024, 1024);

    COMMTIMEOUTS TimeOuts;



    //设定读超时

    TimeOuts.ReadIntervalTimeout = 1000;

    TimeOuts.ReadTotalTimeoutConstant = 5000;

    TimeOuts.ReadTotalTimeoutMultiplier = 500;



    //设定写超时

    TimeOuts.WriteTotalTimeoutConstant = 2000;

    TimeOuts.WriteTotalTimeoutMultiplier = 500;



    SetCommTimeouts(hCom, &TimeOuts);



    //清空缓冲区

    PurgeComm(hCom, PURGE_TXCLEAR|PURGE_RXCLEAR);

    Sleep(500);



    //3.读写串口

    unsigned char buf[10] = {0x00, 0x06, 'D', 'A', 'T', 'A'}; 

    BOOL bWriteStat;

    DWORD dwBytesWrite = 6;

    bWriteStat = WriteFile(hCom, buf, dwBytesWrite, &dwBytesWrite, NULL);

    if (!bWriteStat)

    {

        printf("写串口失败！\n");

    }

    else 

        printf("写串口成功!\n");



    unsigned char rBuf[1024];

    BOOL bReadStat;

    DWORD dwBytesRead;

    bReadStat = ReadFile(hCom, rBuf, 1024, &dwBytesRead, NULL);

    if (!bReadStat)

    {

        printf("读串口失败！\n");

    }

    else

    {

        printf("读串口成功!\n");

    }

    for (DWORD j = 0; j < dwBytesRead; j++)

    {

        printf("%x ", rBuf[j]);

    }

    printf("\n");

    

    //4.关闭串口

    CloseHandle(hCom);

    return 0;

}