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/* Classic Ladder Project */
/* Copyright (C) 2001-2005 Marc Le Douarain */
/* http://www.multimania.com/mavati/classicladder */
/* http://www.sourceforge.net/projects/classicladder */
/* August 2005 */
/* ------------------------------------ */
/* Serial low-level functions for Linux */
/* ------------------------------------ */
/* This library is free software; you can redistribute it and/or */
/* modify it under the terms of the GNU Lesser General Public */
/* License as published by the Free Software Foundation; either */
/* version 2.1 of the License, or (at your option) any later version. */
/* This library is distributed in the hope that it will be useful, */
/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU */
/* Lesser General Public License for more details. */
/* You should have received a copy of the GNU Lesser General Public */
/* License along with this library; if not, write to the Free Software */
/* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */
#include <locale.h>
#include <libintl.h>
#define _(x) gettext(x)
#include <termios.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/signal.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <errno.h>
#include "serial_common.h"
extern int ModbusSerialUseRtsToSend;
extern int ModbusDebugLevel;
extern int ModbusSerialDataBits; // Number of data bits (7, 6, 7, 8)
extern int ModbusSerialStopBits; // Number of stop bits (1 or 2)
extern int ModbusSerialParity; // Parity (00 = NONE, 01 = Odd, 02 = Even, 03 = Mark, 04 = Space)
int SerialSpeed[ ] = { 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 0 };
int SerialCorres[ ] = { B300, B600, B1200, B2400, B4800, B9600, B19200, B38400, B57600, B115200, 0 };
char PortIsOpened = 0;
int fd;
long DATABITS;
long STOPBITS;
long PARITYON;
long PARITY;
struct termios oldtio;
struct termios newtio;
char SerialOpen( char * SerialPortName, int Speed )
{
/* if port already opened => close it before */
if ( PortIsOpened )
SerialClose( );
/* open the device to be non-blocking (read will return immediatly) */
fd = open( SerialPortName, O_RDWR | O_NOCTTY | O_NDELAY/*don't wait DTR*/ );
//fd = open( SerialPortName, O_RDWR | O_NOCTTY | O_NONBLOCK);
if (fd >=0)
{
int BaudRate = -1;
int ScanBaudRate = 0;
fcntl(fd, F_SETFL, O_RDWR | O_NOCTTY ); /* perform blocking reads */
for(ScanBaudRate = 0; SerialSpeed[ScanBaudRate]; ScanBaudRate++)
{
if ( SerialSpeed[ ScanBaudRate ]==Speed )
{
BaudRate = SerialCorres[ ScanBaudRate ];
break;
}
}
switch (ModbusSerialDataBits)
{
case 8:
default:
DATABITS = CS8;
break;
case 7:
DATABITS = CS7;
break;
case 6:
DATABITS = CS6;
break;
case 5:
DATABITS = CS5;
break;
} //end of switch data_bits
switch (ModbusSerialStopBits)
{
case 1:
default:
STOPBITS = 0;
break;
case 2:
STOPBITS = CSTOPB;
break;
} //end of switch stop bits
switch (ModbusSerialParity)
{
case 0:
default: //none
PARITYON = 0;
PARITY = 0;
break;
case 1: //odd
PARITYON = PARENB;
PARITY = PARODD;
break;
case 2: //even
PARITYON = PARENB;
PARITY = 0;
break;
} //end of switch parity
if ( BaudRate!=-1 )
{
tcgetattr(fd,&oldtio); /* save current port settings */
/* set new port settings */
bzero(&newtio, sizeof(newtio));
//newtio.c_cflag = BaudRate | /*CRTSCTS |*/ CS8 | CLOCAL | CREAD;
newtio.c_cflag = BaudRate | DATABITS | STOPBITS | PARITYON | PARITY | CLOCAL | CREAD;
//newtio.c_cflag |= PARENB
newtio.c_iflag = IGNPAR | IGNBRK; // | ICRNL;
newtio.c_oflag = 0;
newtio.c_lflag = 0;
newtio.c_cc[VMIN]=0; //1;
newtio.c_cc[VTIME]=0;
tcsetattr(fd,TCSANOW,&newtio);
PortIsOpened = 1;
}
else
{
printf(_("Speed value not found for serial\n"));
}
}
else
{
printf( _("Failed to open serial port %s...\n"), SerialPortName );
}
return PortIsOpened;
}
void SerialClose( )
{
if ( PortIsOpened )
{
PortIsOpened = 0;
/* restore old port settings */
tcsetattr(fd,TCSANOW,&oldtio);
close(fd);
}
}
void SerialSetRTS( int State )
{
int status;
if ( PortIsOpened )
{
ioctl(fd, TIOCMGET, &status);
if ( State )
status |= TIOCM_RTS;
else
status &= ~TIOCM_RTS;
if ( ModbusDebugLevel>=3 )
printf( _("Set RTS=%d\n"), State );
ioctl(fd, TIOCMSET, &status);
}
}
void SerialSend( char *Buff, int BuffLength )
{
if ( PortIsOpened )
{
if ( ModbusSerialUseRtsToSend )
{
SerialSetRTS( 1 );
}
if ( ModbusDebugLevel>=2 )
printf(_("Serial writing...\n"));
while(BuffLength > 0) {
int r = write(fd,Buff,BuffLength);
if(r < 0) {
if ( ModbusDebugLevel>=1 )
printf(_("SerialSend failed: %s!\n"), strerror(errno));
break;
}
Buff += r;
BuffLength -= r;
}
if ( ModbusDebugLevel>=2 )
printf(_("Writing done!\n"));
// wait until everything has been transmitted
tcdrain( fd );
if ( ModbusSerialUseRtsToSend )
{
SerialSetRTS( 0 );
}
}
}
void SerialSetResponseSize( int Size, int TimeOutResp )
{
if ( PortIsOpened )
{
newtio.c_cc[VMIN] = Size; //Nbr chars we should receive;
newtio.c_cc[VTIME] = 1;
// tcflush(fd, TCIFLUSH);
if ( ModbusDebugLevel>=2 )
printf(_("Serial config...\n"));
tcsetattr(fd,TCSANOW,&newtio);
}
}
int SerialReceive( char * Buff, int MaxBuffLength, int TimeOutResp )
{
int NbrCarsReceived = 0;
if ( PortIsOpened )
{
// the select is used it no char at all is received (else read() block...)
int recep_descrip;
fd_set myset;
struct timeval tv;
FD_ZERO( &myset);
// add descrip to survey and set time-out wanted !
FD_SET( fd, &myset );
tv.tv_sec = TimeOutResp / 1000; //seconds
tv.tv_usec = (TimeOutResp % 1000) * 1000; //micro-seconds
if ( ModbusDebugLevel>=3 )
printf(_("select() for serial reading...\n"));
recep_descrip = select( 16, &myset, NULL, NULL, &tv );
if ( recep_descrip>0 )
{
if ( ModbusDebugLevel>=2 )
printf(_("Serial reading...\n"));
NbrCarsReceived = read(fd,Buff,MaxBuffLength);
if ( ModbusDebugLevel>=2 )
printf(_("%d chars found\n"), NbrCarsReceived);
}
}
return NbrCarsReceived;
}
void SerialFlush( void )
{
if ( PortIsOpened )
{
if ( ModbusDebugLevel>=2 )
printf(_("Serial flush all!\n"));
tcflush( fd, TCIOFLUSH );
usleep( 250*1000 );
tcflush( fd, TCIOFLUSH );
}
}