#include <fcntl.h>   									/* File control definitions 				*/
#include <sys/file.h>
#include <termios.h> 									/* POSIX terminal control definitions 		*/


int main(void)
{
int		 ch;											/* Character received from keyboard			*/
int		 fd;											/* Serial port file descriptor				*/
struct   termios options;
unsigned char TmpChar[80];


	fd = open_port("/dev/com1");						/* Open the serial port in no delay mode	*/
	if (fd == -1) {										/* Could not open the port					*/
		exit(1);
	}
	else {
		tcgetattr(fd, &options);						/* Get current options to modify them		*/
		options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG | IEXTEN);
		options.c_cflag |= (CLOCAL | CREAD);			/* Enable RAW I/O and receiver & local mode	*/
		cfsetispeed(&options, B115200);					/* 115200bps input							*/
		cfsetospeed(&options, B115200);					/* 115200bps output							*/
		options.c_cflag &= ~PARENB;						/* No parity								*/
		options.c_cflag &= ~CSTOPB;						/* 1 Stop bit								*/
		options.c_cflag &= ~CSIZE;						/* Mask out data size						*/
		options.c_cflag |= CS8;							/* 8 bit data								*/
		options.c_iflag &= ~(INLCR | ICRNL | IGNCR);	/* Do not interpret S/W flow control either	*/
		options.c_iflag &= ~(IXON | IXOFF | IXANY);
		options.c_iflag |= IGNBRK;
		tcsetattr(fd, TCSANOW, &options);				/* Post the updated options					*/
	}

	for (;;) {
		printf("Checking for serial input\n");
		ch = read(fd, &TmpChar[0], 1);
		if (ch > 0) {
			printf("Got a character\n");
			if (ch == 'q') {
				break;
			}
		}
		else {
			printf("No character waiting\n");
		}
	}

	close(fd);											/* Close the serial port					*/

	return(0);
}


int open_port(const char *Port)
{

int fd;													/* File descriptor for the port		 		*/


	fd = open(Port, O_RDWR | O_NOCTTY | O_NDELAY);
	if (fd != -1) {										/* Successfully opened port					*/
		fcntl(fd, F_SETFL, FNDELAY);					/* Set to no delay mode						*/
	}

	return(fd);
}

/* EOF */