pc 串口发送 c语言,【求助】51单片机串口发送接收问题（PC向单片机发送1位字符，单片机接收后发回PC）...

你可以参考下面这段代码实现PC向单片机发送一个字符，单片机接收后再回传给PC：

PC端代码：

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

int main()
{
    HANDLE hComm;
    BOOL fSuccess;
    DWORD dwBytesRead, dwBytesWritten;
    char ch = 'A';
    char szBuff[100];

    hComm = CreateFile("COM1", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
    if (hComm == INVALID_HANDLE_VALUE)
    {
        printf("Error in opening serial port\n");
        return 0;
    }

    DCB dcb;
    dcb.DCBlength = sizeof(DCB);
    fSuccess = GetCommState(hComm, &dcb);
    if (!fSuccess)
    {
        printf("Error in GetCommState\n");
        CloseHandle(hComm);
        return 0;
    }
    dcb.BaudRate = CBR_9600;
    dcb.ByteSize = 8;
    dcb.Parity = NOPARITY;
    dcb.StopBits = ONESTOPBIT;
    fSuccess = SetCommState(hComm, &dcb);
    if (!fSuccess)
    {
        printf("Error in SetCommState\n");
        CloseHandle(hComm);
        return 0;
    }

    fSuccess = WriteFile(hComm, &ch, 1, &dwBytesWritten, NULL);
    if (!fSuccess)
    {
        printf("Error in WriteFile\n");
        CloseHandle(hComm);
        return 0;
    }

    fSuccess = ReadFile(hComm, szBuff, sizeof(szBuff), &dwBytesRead, NULL);
    if (!fSuccess)
    {
        printf("Error in ReadFile\n");
        CloseHandle(hComm);
        return 0;
    }
    szBuff[dwBytesRead] = 0;
    printf("Received: %s\n", szBuff);

    CloseHandle(hComm);
    return 0;
}

单片机端代码：

#include <reg51.h>
#include <stdio.h>

#define uchar unsigned char
#define uint unsigned int

sbit TX = P3^1;
sbit RX = P3^0;

void InitUART()
{
    TMOD |= 0x20;
    TH1 = 0xFD;
    TL1 = 0xFD;
    SCON = 0x50;
    TR1 = 1;
}

void SendData(uchar ch)
{
    SBUF = ch;
    while (!TI);
    TI = 0;
}

uchar ReceiveData()
{
    while (!RI);
    RI = 0;
    return SBUF;
}

void main()
{
    uchar ch;
    InitUART();
    while (1)
    {
        ch = ReceiveData();
        SendData(ch);
    }
}

这段代码实现了PC向单片机发送一个字符，单片机接收后再回传给PC。注意，单片机端代码使用了51单片机，如果你使用的是其他单片机，需要相应地修改代码。同时，需要在PC端的代码中修改串口号和波特率。