3 * Simple test for the PiFace interface board.
5 * Read the buttons and output the same to the LEDs
7 * Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
8 ***********************************************************************
9 * This file is part of wiringPi:
10 * https://projects.drogon.net/raspberry-pi/wiringpi/
12 * wiringPi is free software: you can redistribute it and/or modify
13 * it under the terms of the GNU Lesser General Public License as published by
14 * the Free Software Foundation, either version 3 of the License, or
15 * (at your option) any later version.
17 * wiringPi is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU Lesser General Public License for more details.
22 * You should have received a copy of the GNU Lesser General Public License
23 * along with wiringPi. If not, see <http://www.gnu.org/licenses/>.
24 ***********************************************************************
33 int outputs [4] = { 0,0,0,0 } ;
35 void scanButton (int button)
37 if (digitalRead (button) == LOW)
39 outputs [button] ^= 1 ;
40 digitalWrite (button, outputs [button]) ;
43 while (digitalRead (button) == LOW)
52 printf ("Raspberry Pi wiringPiFace test program\n") ;
54 if (wiringPiSetupPiFace () == -1)
57 // Enable internal pull-ups
59 for (pin = 0 ; pin < 8 ; ++pin)
60 pullUpDnControl (pin, PUD_UP) ;
65 for (button = 0 ; button < 4 ; ++button)