Implementación de lectura y escritura de puertos serie (1)

Windows abre el puerto serie, lee y escribe el puerto serie y reconoce automáticamente el puerto serie

El puerto serie lee y escribe en modo asincrónico, es decir, modo sin bloqueo para leer y escribir puertos serie

El nombre del puerto serie es como: "COM3", "COM4", "COM22", etc.

Entre ellos, COM1 a COM9 se pueden abrir con éxito, pero COM10 y sobre todo no se abren, y se requiere un tratamiento especial

Y los métodos de apertura por encima de COM10 son: "\\\\. \\ COM10", "\\\\. \\ COM11", "\\\\. \\ COM22", etc. Este es el nombre del puerto serie por encima de COM10 Método abierto

Abra el puerto serial:

//Open the UART
BOOL OpenUartPort(char *UartPortName)
{
	BOOL bResult = true;
	hComm = CreateFile(
					  UartPortName, 
					  GENERIC_WRITE | GENERIC_READ,	//访问权限
					  0,							//不共享
					  NULL,							//返回的句柄不允许被子进程继承
					  OPEN_EXISTING,
					  FILE_FLAG_OVERLAPPED,							//0：同步模式，FILE_FLAG_OVERLAPPED：异步模式
					  0								//不使用临时文件句柄
					  );
	if(INVALID_HANDLE_VALUE == hComm)
	{
		PrintLogCom("Open Failed!!!\n");
		bResult = false;
	}
	else
	{
		PrintLogCom("Open Successfully!!!\n");
		if(InitUartPort(hComm, 9600, 8, NOPARITY, ONESTOPBIT))
		{
			PrintLogCom("Init Uart Port OK!!!\n");
		}
		else
		{
			//PrintLogCom("Init Uart Port Failed!!!\n");
			bResult = false;
			Close_UartPort();
		}
	}

	return bResult;
}

Inicialice el puerto serie:

//Init UART
BOOL InitUartPort(HANDLE hComm, DWORD BaudRate, BYTE ByteSize, BYTE Parity, BYTE StopBits)
{
	BOOL bResult = true;
	char buffer[50]="";

	//设置接收缓冲区和输出缓冲区的大小
	DWORD dwInQueue = 1024;
	DWORD dwOutQueue = 1024;
	if(!SetupComm(hComm, dwInQueue, dwOutQueue))
	{
		//PrintLogCom("Set In and Out Buffer Failed!!!\n");
		bResult = false;
	}
	else
	{
		//PrintLogCom("Set Input and Output Buffer OK!!!\n");

		//设置读写的超时时间  以毫秒计算
		COMMTIMEOUTS timeouts;
		//for read ReadTotalTimeouts = ReadTotalTimeoutMultiplier * ToReadByteNumber + ReadTotalTimeoutConstant，
		timeouts.ReadIntervalTimeout = MAXDWORD;					//接收两个字符之间的最长超时时间
		timeouts.ReadTotalTimeoutMultiplier = 0;			//与读取要读字节数相乘的系数
		timeouts.ReadTotalTimeoutConstant = 0;				//读取总超时时间常量
		//for write WriteTotalTimeouts = WriteTotalTimeoutMultiplier * ToWriteByteNumber + WriteTotalTimeoutConstant
		//timeouts.WriteTotalTimeoutMultiplier = 0;
		//timeouts.WriteTotalTimeoutConstant = 0;

		if(!SetCommTimeouts(hComm, &timeouts))
		{
			//PrintLogCom("Set Read/Write Timeouts Failed!!!\n");
			bResult = false;
		}
		else
		{
			//PrintLogCom("Set Read/Write Timeouts OK!!!\n");
			//设置DCB(Device-Control-Block)
			DCB dcb;
			if(!GetCommState(hComm, &dcb))
			{
				//PrintLogCom("Get Com DCB Failed!!!\n");
				bResult = false;
			}
			else
			{
				//PrintLogCom("Get Com DCB Successfully!!!\n");
/*				
				sprintf(buffer,"BaudRate = %ld",dcb.BaudRate);
				PrintLogCom(buffer);
				sprintf(buffer,"ByteSize = %u\n",dcb.ByteSize);
				PrintLogCom(buffer);
				sprintf(buffer,"Parity = %u\n",dcb.Parity);
				PrintLogCom(buffer);
				sprintf(buffer,"StopBits = %u\n",dcb.StopBits);
				PrintLogCom(buffer);
				sprintf(buffer,"XonChar = %d\n", dcb.XonChar);
				PrintLogCom(buffer);
*/
				memset(&dcb, 0, sizeof(dcb));
				dcb.BaudRate = BaudRate;
				dcb.ByteSize = ByteSize;
				dcb.Parity = Parity;
				dcb.StopBits = StopBits;
				dcb.XonChar = 1;
	
				if(!SetCommState(hComm, &dcb))
				{
					//PrintLogCom("Set Com Failed!!!\n");
					bResult = false;
				}
				else
				{
					//PrintLogCom("Set Com Successfully!!!\n");

					//清空接收缓存和输出缓存的buffer
					if(!PurgeComm(hComm, PURGE_RXCLEAR | PURGE_TXCLEAR))
					{
						//PrintLogCom("Clean up in buffer and out buffer Failed!!!\n");
						bResult = false;
					}
					else
					{
						//PrintLogCom("Clean up in buffer and out buffer OK!!!\n");
					}
				}
			}
		}
	}

	return bResult;
}

Kushiguchi

BOOL RcvDataFromUartPort(HANDLE hComm, void *RcvBuf, DWORD ToRcvDataLen, DWORD *RcvedDataLen, LPOVERLAPPED lpOverlapped)
{
	BOOL bResult = true;
	DWORD dwTempRcvedDataLen = 0;
	DWORD dwError;

	if (ClearCommError(hComm,&dwError,NULL))
	{
		PurgeComm(hComm,PURGE_TXABORT | PURGE_TXCLEAR);
	}

	if(hComm != INVALID_HANDLE_VALUE)
	{
		if(!ReadFile(hComm, RcvBuf, ToRcvDataLen, &dwTempRcvedDataLen, lpOverlapped))
		{
			if (GetLastError() == ERROR_IO_PENDING)
			{
				while (!GetOverlappedResult(hComm,lpOverlapped,&dwTempRcvedDataLen,FALSE))
				{
					if (GetLastError() == ERROR_IO_INCOMPLETE)
					{
						continue;
					}
					else
					{
						ClearCommError(hComm,&dwError,NULL);
						bResult = false;
						break;
					}
				}
			}
		}
	}
	else
	{
		bResult = false;
	}
	*RcvedDataLen = dwTempRcvedDataLen;
	return bResult;
}

Escribir puerto serie

BOOL SendDataToUartPort(HANDLE hComm, void *SndBuf, DWORD SendDataLen, DWORD *SentDataLen, LPOVERLAPPED lpOverlapped)
{
	BOOL bResult = true;
	DWORD dwTempSndDataLen;
	DWORD dwError;

	if (ClearCommError(hComm,&dwError,NULL))
	{
		PurgeComm(hComm,PURGE_TXABORT | PURGE_TXCLEAR);
	}

	if(hComm != INVALID_HANDLE_VALUE)
	{
		if(!WriteFile(hComm, SndBuf, SendDataLen, &dwTempSndDataLen, lpOverlapped))
		{
			if (GetLastError() == ERROR_IO_PENDING)
			{
				while (!GetOverlappedResult(hComm,lpOverlapped,&dwTempSndDataLen,FALSE))
				{
					if (GetLastError() == ERROR_IO_INCOMPLETE)
					{
						continue;
					}
					else
					{
						ClearCommError(hComm,&dwError,NULL);
						bResult = false;
						break;
					}
				}
			}
		}
	}
	else
	{
		bResult = false;
	}
	*SentDataLen = dwTempSndDataLen;

	return bResult;
}