/*  keyboard_read.c
 *
 *  Created on: Sept. 4, 2010
 *  	Author: Jan Axelson
 *
 *      Demonstrates how to check keyboard input without blocking.
 *      Uses the ncurses library.
 *      This file, led_control.h, and led_control.c are at www.Lvr.com/beagleboard.htm
 */

// To gain access to the LEDs, run the application with administrative privileges 
// (From the file's directory, use "sudo ./usb_keyboard_read".)
// Or set up a udev rule as described in led_control.c.

#include <ncurses.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "../led_control/led_control.h"

void led_initialize();
void  sigint_handler(int sig);

/*
 * Checks for pending keypresses, retrieves the keys, and takes appropriate action.
 * The application can perform other tasks in between checking for key presses.
 * Ctrl+C ends the application. Uses ncurses for non-blocking keyboard input.
 */

int main()
{
	led_initialize();

	// Use ncurses.

	initscr();

	// Assign a handler to reset the terminal on Ctrl+C.

	signal (SIGINT, ( void* ) sigint_handler);

	printw("Keyboard read demo.\n");
	printw("Press 1 to turn on usr0. Press 0 to turn off usr0\n");
	printw("Press Ctrl+C to end the program.\n");

	int keypress;

	// getch returns immediately whether or not a key was pressed.

	nodelay(stdscr, TRUE);

	for (;;)
	{
		keypress = getch();

		if (keypress == '0')
		{
			// 0 was pressed. Turn off LED 0.

			led_control(0, 0);
		}
		if (keypress == '1')
		{
			// 1 was pressed. Turn on LED 0.

			led_control(0, 1);
		}
	 }
	// The application can perform other tasks here.
	// sleep(1) is a place holder for these tasks. (OK to delete.)

	sleep(1);
    return 0;
}

/*
 * This routine executes when the user presses Control + C.
 * Resets the terminal and exits the program.
 */

void  sigint_handler(int sig)
{
	endwin();
	exit (sig);
}