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#include "hfile.h"

#define TO_B110 3200000 /* These values are the timeout delays */

#define TO_B300 1600000 /* at the end of packets of data. */

#define TO_B600 800000 /* At this stage a true calculation */

#define TO_B1200 400000 /* has not been worked out. So these */

#define TO_B2400 200000 /* values are just a guess. */

#define TO_B4800 100000 /* */

#define TO_B9600 50000 /* The spec says that a message frame */

#define TO_B19200 25000 /* starts after a silent interval of */

#define TO_B38400 12500 /* at least 3.5 character times. */

#define TO_B57600 8333 /* These are uS times. */

#define TO_B115200 4167

int set_up_comms( char *device, int baud_i, char *parity )

{

int ttyfd;

struct termios settings;

int char_interval_timeout;

speed_t baud_rate;

printf("set_up_comms device=%s\n",device);

if(( ttyfd = open( device,(O_RDWR | O_NOCTTY /*| O_SYNC | ~O_NONBLOCK*/) ) ) < 0 )

{

fprintf( stderr, "set_up_comms Error opening device %s.\n", device );

fprintf( stderr, "Error no. %d = %s\n", errno, strerror(errno));

exit( 1 );

}

tcgetattr(ttyfd,&settings);

#ifdef DEBUG

fprintf( stderr, "opening %s\n", device );

#endif

switch( baud_i )

{

case 110:

baud_rate = 110;

char_interval_timeout = TO_B110;

break;

case 300:

baud_rate = 300;

char_interval_timeout = TO_B300;

break;

case 600:

baud_rate = 600;

char_interval_timeout = TO_B600;

break;

case 1200:

baud_rate = 1200;

char_interval_timeout = TO_B1200;

break;

case 2400:

baud_rate = 2400;

char_interval_timeout = TO_B2400;

break;

case 4800:

baud_rate = 4800;

char_interval_timeout = TO_B4800;

break;

case 9600: case 0:

baud_rate = 9600; //baud_rate = B9600;

char_interval_timeout = TO_B9600;

//char_interval_timeout = 9600;

break;

case 19200:

baud_rate = 19200;

char_interval_timeout = TO_B19200;

break;

case 38400:

baud_rate = 38400;

char_interval_timeout = TO_B38400;

break;

case 57600:

baud_rate = 57600;

char_interval_timeout = TO_B57600;

break;

case 115200:

baud_rate = 115200;

char_interval_timeout = TO_B115200;

break;

default:

baud_rate = 9600;

char_interval_timeout = TO_B9600;

fprintf(stderr, "Unknown baud rate %d for %s.", baud_i, device);

}

#ifdef DEBUG

fprintf( stderr, "%s open\n", device );

#endif

/* read your man page for the meaning of all this. # man termios */

/* Its a bit to involved to comment here */

cfsetispeed( &settings, baud_rate );/* Set the baud rate */

cfsetospeed( &settings, baud_rate );

settings.c_cflag &=~ CSIZE;

settings.c_cflag |= CS8;

settings.c_cflag &=~ CSTOPB;

// settings.c_cflag |= CREAD;

if( strncmp( parity, "none", 4 ) == 0 )

{

settings.c_cflag &=~ PARENB;

settings.c_cflag &=~ PARODD;

}

else

if( strncmp( parity, "even", 4 ) == 0 )

{

settings.c_cflag |= PARENB;

settings.c_cflag &=~ PARODD;

}

else

{

settings.c_cflag |= PARENB;

settings.c_cflag |= PARODD;

}

// settings.c_cflag |= ~CNEW_RTSCTS;

// settings.c_cflag |= ~CRTSCTS;

// settings.c_cflag &= ~IHFLOW;

// settings.c_cflag &= ~OHFLOW;

// settings.c_cflag &= ~LKHFLOW;

settings.c_cflag &= ~HUPCL;

settings.c_cflag &= ~CLOCAL;

settings.c_cc[VMIN] = 1;

settings.c_cc[VTIME] = 0;

if( tcsetattr( ttyfd, TCSANOW, &settings ) < 0 )

{

fprintf( stderr, "tcsetattr failed\n");

exit( 1 );

}

return( ttyfd );

}