connect.c

It is a software to decode information received by a normal GPS like GARMIN, UBLOX if it sends NMEA

#include <termios.h>                                                         
#include <stdio.h>  
#include <stdlib.h>                                                         
#include <unistd.h>                                                          
#include <fcntl.h>                                                           
#include <sys/signal.h>                                                      
#include <sys/types.h>
#include <string.h>
#include "connect.h"

#define BAUDRATE B9600

/*
int main()
{
	int fd,i=0;

	char buf[1000]; 
	int tam;
	
	char port[]="/dev/ttyUSB0";
	int baudrate=19200;
	
	init_port(&fd,&port[0],baudrate);
	while(i<20)
	{
		read_port(&fd,&buf[0],&tam);
		buf[tam]=0;
		printf("%d %s",i,buf);
		i++;
	}
	
	
	return 0;
}

*/


void init_port(int *fd,char *port, int baud)
{
	
	struct sigaction saio;           /* definition of signal action */                                                          
	struct termios newtio;
	/* open the device to be non-blocking (read will return immediatly) */     
	printf("\nport %s\tbaud %d\n",port,baud);
	*fd = open(port, O_RDWR | O_NOCTTY | O_NONBLOCK );                    
	if (*fd <0) {perror(port); exit(-1); }   
	 
	/* install the signal handler before making the device asynchronous */     
	saio.sa_handler = signal_handler_IO;                                       
	//saio.sa_mask = 0;                                                          
	saio.sa_flags = 0;                                                         
	saio.sa_restorer = NULL;                                                   
	sigaction(SIGIO,&saio,NULL);                                               
																			   
	/* allow the process to receive SIGIO */                                   
	fcntl(*fd, F_SETOWN, getpid());                                             
	/* Make the file descriptor asynchronous (the manual page says only        
	   O_APPEND and O_NONBLOCK, will work with F_SETFL...) */                  
	fcntl(*fd, F_SETFL, FASYNC);   
	      
	newtio.c_cflag = BAUDRATE | CRTSCTS | CS8 | CLOCAL | CREAD;                
	newtio.c_iflag = IGNPAR | ICRNL | IGNCR ;                                           
	newtio.c_oflag = 0;                                                        
	newtio.c_lflag = ICANON;                                                   
	newtio.c_cc[VMIN]=1;                                                       
	newtio.c_cc[VTIME]=0;                                                      
	tcflush(*fd, TCIFLUSH);                                                     
	tcsetattr(*fd,TCSANOW,&newtio);
	
	
}
	
void signal_handler_IO (int status)                                          
{                                                                            
//printf("\nSIGIO");                                        
//usleep(1000);                                                        
}  

void read_port(int *fd,char *buf,int *tam)
{

	//pause();
	*tam = read(*fd,buf,1000);
}

void close_port(int *fd)
{
	close(*fd);
}