Правильно ли открываю СОМ порт?????????????????????????????????????
#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 ); }