uartinit.c.svn-base

modbus rtu协议 linux 平台的实现.读取相关配置文件信息.通过串口发送数据.

/******************************************************************************
 *
 * Copyright (c) 2008 Shanghai IS Software
 *
 * All rights reserved
 *
 * $Revision$
 *
 * $LastChangedBy$
 *
 * $LastChangedData$
 *
 * Description:
 *
 * Revision History:
 * 2008/08/28 14:33 by lcj
 * #1.created
 *
 *****************************************************************************/

#include "modbus_rtu/modbus.h"
/**
*	brief
*
**/
int  speed_arr[] = {B115200,B57600,B38400,B19200,B9600,B4800,B2400,B1200,B300,
						B200,B150,B75,B50,B0};

int name_arr[] = {115200,57600,38400,19200,9600,4800,2400,1200,300,
						200,150,75,50,0};

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 )
			{
				perror("tcsetattr fd1");
				return ;
			}

			tcflush(fd,TCIOFLUSH);
 		}
	}
		
}


/**
*	brief 
*
**/
int set_parity(int fd, int databits,int stopbits, int parity)
{
	struct termios options;

	if ( tcgetattr( fd, &options) !=  0 ) 
	{
		perror("setupserial 1");
		return (FALSE);
	}
	options.c_cflag &= ~CSIZE;
	switch ( databits )
	{
		case 7:
			options.c_cflag |= CS7;
			break;
		case 8:
			options.c_cflag |= CS8;
			break;
		default:
			fprintf(stderr,"Unsupported data size\n");
			return  FALSE;
	}

	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:
			fprintf(stderr,"Unsupported parity\n");
			return FALSE;		
	}

	switch (stopbits)
	{
		case 1:
			options.c_cflag &= ~CSTOPB;
			break;
		case 2:
			options.c_cflag |= CSTOPB;
			break;
		default:
			fprintf(stderr,"Unsupported stop bits\n");
			return FALSE;
	}

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

	options.c_cc[VTIME] = 150;
	options.c_cc[VMIN] = 0;
	
	tcflush(fd,TCIFLUSH);

	options.c_lflag  &= ~(ICANON | ECHO | ECHOE | ISIG);
	options.c_oflag  &= ~OPOST;
	

	if  ( tcsetattr(fd, TCSANOW,&options) != 0 )
	{
		perror("setupserial 3");
		return FALSE;
	}

	return TRUE;
}