Programming Linux serial port, ttyS0

Question

I\'m trying to learn how to program the ttyS0 serial port in Linux using C. I have another machine connected to my serial port sending alternating hex values of 5f and 6f about

Answer 1

The following line will cause problems:

options.c_cflag &= CSTOPB;

It will reset all other bits of the c_cflag.

If you want to use 1 stop bit, then use:

options.c_cflag &= ~CSTOPB;

If you want to use 2 stop bits, then use:

options.c_cflag |= CSTOPB;

EDIT:

Also the following line cause problems:

fcntl(fd, F_SETFL, 0);

It will reset several important flags.