//============================================================================
// Name        : hello.cpp
// Author      :
// Version     :
// Copyright   : Your copyright notice
// Description : Hello World in C++, Ansi-style
//============================================================================

#include <iostream>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <termios.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>

/* baudrate settings are defined in <asm/termbits.h>, which is
        included by <termios.h> */
#define BAUDRATE B38400
/* change this definition for the correct port */
#define MODEMDEVICE "/dev/ttyS1"
#define _POSIX_SOURCE 1 /* POSIX compliant source */

#define FALSE 0
#define TRUE 1

volatile int STOP=FALSE;

main()
{
	int fd,c, res;
	struct termios oldtio,newtio;
	char buf[4096];
	/*
          Open modem device for reading and writing and not as controlling tty
          because we don't want to get killed if linenoise sends CTRL-C.
	 */
	fd = open(MODEMDEVICE, O_RDWR | O_NOCTTY );
	if (fd <0) {perror(MODEMDEVICE); exit(-1); }

	tcgetattr(fd,&oldtio); /* save current serial port settings */
	bzero(&newtio, sizeof(newtio)); /* clear struct for new port settings */

	/*
          BAUDRATE: Set bps rate. You could also use cfsetispeed and cfsetospeed.
          CRTSCTS : output hardware flow control (only used if the cable has
                    all necessary lines. See sect. 7 of Serial-HOWTO)
          CS8     : 8n1 (8bit,no parity,1 stopbit)
          CLOCAL  : local connection, no modem contol
          CREAD   : enable receiving characters
	 */
	newtio.c_cflag = BAUDRATE | CRTSCTS | CS8 | CLOCAL | CREAD;

	/*
          IGNPAR  : ignore bytes with parity errors
          ICRNL   : map CR to NL (otherwise a CR input on the other computer
                    will not terminate input)
          otherwise make device raw (no other input processing)
	 */
	newtio.c_iflag = IGNPAR | ICRNL;

	/*
         Raw output.
	 */
	newtio.c_oflag = 0;

	/*
          ICANON  : enable canonical input
          disable all echo functionality, and don't send signals to calling program
	 */
	newtio.c_lflag = ICANON;

	/*
          initialize all control characters
          default values can be found in /usr/include/termios.h, and are given
          in the comments, but we don't need them here
	 */
	newtio.c_cc[VINTR]    = 0;     /* Ctrl-c */
	newtio.c_cc[VQUIT]    = 0;     /* Ctrl-\ */
	newtio.c_cc[VERASE]   = 0;     /* del */
	newtio.c_cc[VKILL]    = 0;     /* @ */
	newtio.c_cc[VEOF]     = 4;     /* Ctrl-d */
	newtio.c_cc[VTIME]    = 0;     /* inter-character timer unused */
	newtio.c_cc[VMIN]     = 1;     /* blocking read until 1 character arrives */
	newtio.c_cc[VSWTC]    = 0;     /* '\0' */
	newtio.c_cc[VSTART]   = 0;     /* Ctrl-q */
	newtio.c_cc[VSTOP]    = 0;     /* Ctrl-s */
	newtio.c_cc[VSUSP]    = 0;     /* Ctrl-z */
	newtio.c_cc[VEOL]     = 0;     /* '\0' */
	newtio.c_cc[VREPRINT] = 0;     /* Ctrl-r */
	newtio.c_cc[VDISCARD] = 0;     /* Ctrl-u */
	newtio.c_cc[VWERASE]  = 0;     /* Ctrl-w */
	newtio.c_cc[VLNEXT]   = 0;     /* Ctrl-v */
	newtio.c_cc[VEOL2]    = 0;     /* '\0' */

	/*
          now clean the modem line and activate the settings for the port
	 */
	tcflush(fd, TCIFLUSH);
	tcsetattr(fd,TCSANOW,&newtio);

	/*
          terminal settings done, now handle input
          In this example, inputting a 'z' at the beginning of a line will
          exit the program.
	 */
	while (1) {
		res = read(fd,buf,4096);
		buf[res]=0;             /* set end of string, so we can printf */
		printf("%s\n", buf);

		write(fd,"OK",3);
	}
	/* restore the old port settings */
	tcsetattr(fd,TCSANOW,&oldtio);
}