/*
 * This is an example file showing how to send data to the serial port.
 *
 * It does not include error checking.
 */
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h> 
#include <errno.h>
#include <termios.h>

#define DEVICE "/dev/ttyS1"


int openPort(char *device);
void closePort(int fd);


int main(int argc, char **argv)
{
	int serial;

	serial = openPort(DEVICE);

	write(serial, "Hello World", 11); 

	closePort(serial);

	return(0);
}


/***************************************************************************
 *  Serial functions
 **************************************************************************/


/* Open raw serial port using:
 *    8 data bits
 *    1 stop bit
 *    19200 bps
 *    no parity
 */
int 
openPort(char *device)
{
	struct termios options;
	int fd;

	fd = open(device, O_RDWR | O_NOCTTY | O_NDELAY);
	if (fd == -1)
	{
		perror("open_port: Unable to open device");
		return(-1);
	}

	fcntl(fd, F_SETFL, 0);

	tcgetattr(fd, &options);

	cfsetispeed(&options, B19200);  
	cfsetospeed(&options, B19200);

	/* set raw mode, 1 second timeout */
	options.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
	options.c_cflag |= CLOCAL | CREAD | CS8;
	options.c_lflag &= ~(ICANON | ECHO | ECHOE | IEXTEN | ECHONL | ISIG);
	options.c_iflag &= ~(IXON | IXOFF | IXANY | IGNBRK | BRKINT | PARMRK
			               | ISTRIP | INLCR | IGNCR | ICRNL);
	options.c_oflag &= ~OPOST;
	options.c_cc[VMIN]  = 0;
	options.c_cc[VTIME] = 10;

	tcsetattr(fd, TCSANOW, &options);

	return (fd);
}

void 
closePort(int fd)
{
	close(fd);
}