3 * Read the Gertboard buttons. Each one will act as an on/off
4 * tiggle switch for 3 different LEDs
6 * Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
7 ***********************************************************************
8 * This file is part of wiringPi:
9 * https://projects.drogon.net/raspberry-pi/wiringpi/
11 * wiringPi is free software: you can redistribute it and/or modify
12 * it under the terms of the GNU Lesser General Public License as published by
13 * the Free Software Foundation, either version 3 of the License, or
14 * (at your option) any later version.
16 * wiringPi is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU Lesser General Public License for more details.
21 * You should have received a copy of the GNU Lesser General Public License
22 * along with wiringPi. If not, see <http://www.gnu.org/licenses/>.
23 ***********************************************************************
29 // Array to keep track of our LEDs
31 int leds [] = { 0, 0, 0 } ;
34 // See if a button is pushed, if so, then flip that LED and
35 // wait for the button to be let-go
37 void scanButton (int button)
39 if (digitalRead (button) == HIGH) // Low is pushed
42 leds [button] ^= 1 ; // Invert state
43 digitalWrite (4 + button, leds [button]) ;
45 while (digitalRead (button) == LOW) // Wait for release
53 printf ("Raspberry Pi Gertboard Button Test\n") ;
58 // Pins 3, 4, 5, 6 and 7 output:
59 // We're not using 3 or 4, but make sure they're off anyway
60 // (Using same hardware config as blink12.c)
62 for (i = 3 ; i < 8 ; ++i)
70 for (i = 0 ; i < 3 ; ++i)
73 pullUpDnControl (i, PUD_UP) ;
79 for (i = 0 ; i < 3 ; ++i)