hai,
i was writing a serial port program and i dont know what went wrong...
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <termios.h>
#include <stdio.h>
#include <stdlib.h>
#define BAUDRATE B9600
main()
{
int fd,c, res,STOP;
struct termios oldtio,newtio;
char buf[255];
fd = open("/dev/ttyS0", O_RDWR | O_NOCTTY );
if (fd <0) {perror("/dev/ttyS0"); exit(-1); }
tcgetattr(fd,&oldtio); /* save current serial port settings */
bzero(&newtio, sizeof(newtio)); /* clear struct for new port settings */
newtio.c_cflag = BAUDRATE | CRTSCTS | CS8 | CLOCAL | CREAD;
newtio.c_iflag = IGNPAR | ICRNL;
newtio.c_oflag = 0;
newtio.c_lflag = ICANON;
tcflush(fd, TCIFLUSH);
tcsetattr(fd,TCSANOW,&newtio);
write(fd,"hello world\n",12);
while (STOP==0)
{
res = read(fd,buf,255);
buf[res]=0;
printf(":%s:%d\n", buf, res);
if (buf[0]=='z') STOP=1;
}
tcsetattr(fd,TCSANOW,&oldtio);
}
i have connected a wire from RxD to TxD of my serial port.
pls help...
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