如何用c语言编写向串口发送指令的程序 如0x01

#include
#include
int main()
{
  HANDLE hComm;

    hComm = CreateFile(“COM1”,          // for COM1—COM9 only
                       GENERIC_READ | GENERIC_WRITE, //Read/Write
                       0,               // No Sharing
                       NULL,            // No Security
                       OPEN_EXISTING,   // Open existing port only
                       0,               // Non Overlapped I/O
                       NULL);

    if (hComm == INVALID_HANDLE_VALUE)
        printf(“Error in opening serial port”);
    else
        printf(“opening serial port successful”);

    char lpBuffer[] = 0x01;
    DWORD dNoOFBytestoWrite;         // No of bytes to write into the port
    DWORD dNoOfBytesWritten = 0;     // No of bytes written to the port
    dNoOFBytestoWrite = sizeof(lpBuffer);

    Status = WriteFile(hComm,        // Handle to the Serial port
                       lpBuffer,     // Data to be written to the port
                       dNoOFBytestoWrite,  //No of bytes to write
                       &dNoOfBytesWritten, //Bytes written
                       NULL);

    CloseHandle(hComm);//Closing the Serial Port

      return 0;
}

简单来说就是根据芯片手册对串口进行驱动
基本过程就是初始化：配置相关寄存器，设置波特率等属性
编写发送和接收函数
调用
网上应该有不少你用的型号的例程，可以搜索阅读

那得看你用的什么芯片 在C语言函数里初始化芯片接口 比如你要向p2.0口发送数据 就写
p2^0=0x01