51和串口助手上位机通信,接收到串口助手发来的字符后原样发回可以帮我写个c语言代码吗
时间: 2023-03-28 09:01:13 浏览: 77
可以的,以下是一个简单的 C 语言代码示例:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <windows.h>
int main()
{
HANDLE hComm;
DCB dcb;
COMMTIMEOUTS timeouts;
char portName[] = "COM1"; // 串口号
char readBuffer[1024];
DWORD bytesRead, bytesWritten;
BOOL success;
// 打开串口
hComm = CreateFile(portName, GENERIC_READ | GENERIC_WRITE, , NULL, OPEN_EXISTING, , NULL);
if (hComm == INVALID_HANDLE_VALUE) {
printf("Failed to open serial port\n");
return 1;
}
// 配置串口
memset(&dcb, , sizeof(dcb));
dcb.DCBlength = sizeof(dcb);
success = GetCommState(hComm, &dcb);
if (!success) {
printf("Failed to get serial port state\n");
CloseHandle(hComm);
return 1;
}
dcb.BaudRate = CBR_960; // 波特率
dcb.ByteSize = 8; // 数据位
dcb.Parity = NOPARITY; // 校验位
dcb.StopBits = ONESTOPBIT; // 停止位
success = SetCommState(hComm, &dcb);
if (!success) {
printf("Failed to set serial port state\n");
CloseHandle(hComm);
return 1;
}
// 配置超时
memset(&timeouts, , sizeof(timeouts));
timeouts.ReadIntervalTimeout = 50;
timeouts.ReadTotalTimeoutConstant = 50;
timeouts.ReadTotalTimeoutMultiplier = 10;
timeouts.WriteTotalTimeoutConstant = 50;
timeouts.WriteTotalTimeoutMultiplier = 10;
success = SetCommTimeouts(hComm, &timeouts);
if (!success) {
printf("Failed to set serial port timeouts\n");
CloseHandle(hComm);
return 1;
}
// 读取数据并原样发送回去
while (1) {
success = ReadFile(hComm, readBuffer, sizeof(readBuffer), &bytesRead, NULL);
if (!success) {
printf("Failed to read from serial port\n");
CloseHandle(hComm);
return 1;
}
if (bytesRead > ) {
success = WriteFile(hComm, readBuffer, bytesRead, &bytesWritten, NULL);
if (!success) {
printf("Failed to write to serial port\n");
CloseHandle(hComm);
return 1;
}
}
}
// 关闭串口
CloseHandle(hComm);
return ;
}
```
这个代码可以打开指定的串口,配置波特率、数据位、校验位和停止位,然后循环读取串口数据并原样发送回去。你可以根据自己的需求修改代码。