serial.cpp

一个linux下的用QT2编写的关于gprs的发短信,拨打电话的源码

#include "serial.h"

MySerial::MySerial( )
{
}

MySerial::~MySerial()
{

}

int MySerial::set_opt(int fd,int nSpeed, int nBits, char nEvent, int nStop)
{
	struct termios newtio,oldtio;
	if  ( tcgetattr( fd,&oldtio)  !=  0) { 
		perror("SetupSerial 1");
		return -1;
	}
	bzero( &newtio, sizeof( newtio ) );
	newtio.c_cflag  |=  CLOCAL | CREAD; 
	newtio.c_cflag &= ~CSIZE; 
//	newtio.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
//	newtio.c_oflag &= ~OPOST;
	switch( nBits )
	{
	case 7:
		newtio.c_cflag |= CS7;
		break;
	case 8:
		newtio.c_cflag |= CS8;
		break;
	}

	switch( nEvent )
	{
	case 'O':
		newtio.c_cflag |= PARENB;
		newtio.c_cflag |= PARODD;
		newtio.c_iflag |= (INPCK | ISTRIP);
		break;
	case 'E': 
		newtio.c_iflag |= (INPCK | ISTRIP);
		newtio.c_cflag |= PARENB;
		newtio.c_cflag &= ~PARODD;
		break;
	case 'N':  
		newtio.c_cflag &= ~PARENB;
		break;
	}

	switch( nSpeed )
	{
	case 2400:
		cfsetispeed(&newtio, B2400);
		cfsetospeed(&newtio, B2400);
		break;
	case 4800:
		cfsetispeed(&newtio, B4800);
		cfsetospeed(&newtio, B4800);
		break;
	case 9600:
		cfsetispeed(&newtio, B9600);
		cfsetospeed(&newtio, B9600);
		break;
	case 115200:
		cfsetispeed(&newtio, B115200);
		cfsetospeed(&newtio, B115200);
		break;
	default:
		cfsetispeed(&newtio, B9600);
		cfsetospeed(&newtio, B9600);
		break;
	}
	if( nStop == 1 )
		newtio.c_cflag &=  ~CSTOPB;
	else if ( nStop == 2 )
	newtio.c_cflag |=  CSTOPB;
	newtio.c_cc[VTIME]  = 0;
	newtio.c_cc[VMIN] = 0;
	tcflush(fd,TCIFLUSH);
	if((tcsetattr(fd,TCSANOW,&newtio))!=0)
	{
		perror("com set error");
		return -1;
	}
	return 0;
}

int MySerial::open_port(int fd,int comport)
{
	if (comport==1)
	{	fd = open( "/dev/ttyS0", O_RDWR|O_NOCTTY|O_NDELAY);
		if (-1 == fd){
			perror("Can't Open Serial /dev/ttyS0 Port");
			return(-1);
		}
	}
	else if(comport==2)
	{	fd = open( "/dev/ttyS1", O_RDWR|O_NOCTTY|O_NDELAY);
		if (-1 == fd){
			perror("Can't Open Serial /dev/ttyS1 Port");
			return(-1);
		}
	}
	else if (comport==3)
	{
		fd = open( "/dev/ttyS2", O_RDWR|O_NOCTTY|O_NDELAY);
		if (-1 == fd){
			perror("Can't Open Serial /dev/ttyS2 Port");
			return(-1);
		}
	}
	if(fcntl(fd, F_SETFL, 0)<0)
		perror("fcntl failed!");
	if(isatty(STDIN_FILENO)==0)
		perror("standard input is not a terminal device");
	return fd;
}

int MySerial::nwrite (int serialfd, const char *data, int datalength )
{
    int len = 0, total_len = 0;
    for (total_len = 0 ; total_len < datalength;) 
    {
	len = 0;
	len = write(serialfd, &data[total_len], datalength - total_len);
        if (len > 0) 
            total_len += len;          
   }
    return (total_len);
}