init_port.c

这是在linux下利用GPS MODERM通过串口进行短信发送的源代码

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <termios.h>
#include <errno.h>

#include "send.h"

int speed_arr[] = { B57600, B38400, B19200, B9600, B4800, 
			B57600, B38400, B19200, B9600, B4800, };
int name_arr[] = { 57600, 38400, 19200, 9600, 4800,
			57600, 38400, 19200, 9600, 4800, };

void Set_speed( int fd, int speed )
{
	int	i;
	int	status;
	struct	termios  Opt;

	tcgetattr( fd, &Opt );
	for( i=0; i<sizeof(speed_arr)/sizeof(int); i++ )
	{
		if( speed == name_arr[i] )
		{
			tcflush( fd, TCIOFLUSH );
			cfsetispeed( &Opt, speed_arr[i] );
			cfsetospeed( &Opt, speed_arr[i] );
			status = tcsetattr( fd, TCSANOW, &Opt );
			if( status != 0 )
			{
				elog( "tcsetattr fd error\n" );
				return;
			}
			tcflush( fd, TCIOFLUSH );
		}
	}
}

int set_Parity( int fd, int databits, int stopbits, int parity )
{
	struct termios options;

	if( tcgetattr( fd, &options ) != 0 )
	{
		elog( "Tcgetattr error" );
		return -1;
	}

	options.c_cflag &= ~CSIZE;
	switch( databits )
	{
		case 7:
			options.c_cflag |=CS7;
			break;
		case 8:
			options.c_cflag |=CS8;
			break;
		default:
			printf( "unsupported data size\n" );
			return -1;
	}
	
	switch( parity )
	{
		case 'n':
		case 'N':
			options.c_cflag &= ~PARENB;
			options.c_iflag &= ~INPCK;
			break;
		case 'o':
		case 'O':
			options.c_cflag |= ( PARODD | PARENB );
			options.c_iflag |= INPCK;
			break;
		case 'e':
		case 'E':
			options.c_cflag |= PARENB;
			options.c_cflag &= ~PARODD;
			options.c_iflag |= INPCK;
			break;
		case 's':
		case 'S':
			options.c_cflag &= ~PARENB;
			options.c_cflag &= ~CSTOPB;
			break;
		default:
			printf( "unsupported data size\n" );
			return -1;
	}

	switch( stopbits )
	{
		case 1:
			options.c_cflag &= ~CSTOPB;
			break;
		case 2:
			options.c_cflag |= CSTOPB;
			break;
		default:
			printf( "unsupported data size\n" );
			return -1;
	}

	if( parity != 'n' )
		options.c_iflag |= INPCK;

	tcflush( fd, TCIFLUSH );
	//options.c_cflag |= ( CLOCAL | CREAD );
	options.c_lflag &= ~( ICANON | ECHO | ECHOE | ISIG );
	options.c_oflag &= ~OPOST;
	options.c_cc[VTIME] = 15;
	options.c_cc[VMIN] = 0;

	if( tcsetattr( fd, TCSANOW, &options ) != 0 )
	{
		elog( " Tcsetattr error\n" );
		return -1;
	}
	return 1;
}

main()
{
	int	fd;
	char	smsstr[202];
	struct  termios options;

	fd = OpenDev( PORT );
	Set_speed( fd, SPEED );

	if( set_Parity( fd, 8, 1, 'N' ) == -1 )
	{
		elog( "Set parity error\n" );
		exit( 1 );
	}
	printf( "初始化串口和MODERM成功\n" );

	sprintf( smsstr, "AT+CMGF=0\r" );
	write( fd, smsstr, strlen(smsstr) );

	close( fd );
}