用C++写一个串口通信
时间: 2023-08-25 16:04:20 浏览: 41
以下是一个简单的串口通信示例,使用了Windows API函数来实现串口通信:
```c++
#include <windows.h>
#include <stdio.h>
int main()
{
HANDLE hSerial;
DCB dcbSerialParams = { 0 };
COMMTIMEOUTS timeouts = { 0 };
DWORD dwBytesWritten = 0;
DWORD dwBytesRead = 0;
char szBuff[256] = { 0 };
BOOL bPortReady = FALSE;
DWORD dwError = 0;
// 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;
}
// 配置超时时间
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;
}
// 等待串口准备好
while (!bPortReady)
{
dwError = GetLastError();
if (dwError != ERROR_IO_PENDING)
{
printf("Error waiting for port to be ready\n");
CloseHandle(hSerial);
return 1;
}
if (GetOverlappedResult(hSerial, &ovEventWait, &dwBytesRead, TRUE))
{
bPortReady = TRUE;
}
}
// 发送数据
char szData[] = "Hello, world!";
if (!WriteFile(hSerial, szData, sizeof(szData), &dwBytesWritten, NULL))
{
printf("Error writing to serial port\n");
CloseHandle(hSerial);
return 1;
}
// 读取数据
if (!ReadFile(hSerial, szBuff, sizeof(szBuff), &dwBytesRead, NULL))
{
printf("Error reading from serial port\n");
CloseHandle(hSerial);
return 1;
}
// 关闭串口
CloseHandle(hSerial);
return 0;
}
```
需要注意的是,此代码仅适用于Windows系统。在Linux系统中,串口通信的实现方法略有不同。