3 * Simple button test for the Quick2Wire interface board.
5 * Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
6 ***********************************************************************
7 * This file is part of wiringPi:
8 * https://projects.drogon.net/raspberry-pi/wiringpi/
10 * wiringPi is free software: you can redistribute it and/or modify
11 * it under the terms of the GNU Lesser General Public License as published by
12 * the Free Software Foundation, either version 3 of the License, or
13 * (at your option) any later version.
15 * wiringPi is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU Lesser General Public License for more details.
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with wiringPi. If not, see <http://www.gnu.org/licenses/>.
22 ***********************************************************************
35 // Enable the on-goard GPIO
39 printf ("Raspberry Pi - Quick2Wire Mainboard Button & LED Test\n") ;
41 pinMode (BUTTON, INPUT) ;
42 pinMode (LED1, OUTPUT) ;
43 pinMode (LED2, OUTPUT) ;
45 digitalWrite (LED1, HIGH) ; // On-board LED on
46 digitalWrite (LED2, LOW) ; // 2nd LED off
50 if (digitalRead (BUTTON) == HIGH) // Swap LED states
52 digitalWrite (LED1, LOW) ;
53 digitalWrite (LED2, HIGH) ;
54 while (digitalRead (BUTTON) == HIGH)
56 digitalWrite (LED1, HIGH) ;
57 digitalWrite (LED2, LOW) ;