/* * buttons.c: * Read the Gertboard buttons. Each one will act as an on/off * tiggle switch for 3 different LEDs * * Copyright (c) 2012-2013 Gordon Henderson. *********************************************************************** * This file is part of wiringPi: * https://projects.drogon.net/raspberry-pi/wiringpi/ * * wiringPi is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * wiringPi is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with wiringPi. If not, see . *********************************************************************** */ #include #include // Array to keep track of our LEDs int leds [] = { 0, 0, 0 } ; // scanButton: // See if a button is pushed, if so, then flip that LED and // wait for the button to be let-go void scanButton (int button) { if (digitalRead (button) == HIGH) // Low is pushed return ; leds [button] ^= 1 ; // Invert state digitalWrite (4 + button, leds [button]) ; while (digitalRead (button) == LOW) // Wait for release delay (10) ; } int main (void) { int i ; printf ("Raspberry Pi Gertboard Button Test\n") ; wiringPiSetup () ; // Setup the outputs: // Pins 3, 4, 5, 6 and 7 output: // We're not using 3 or 4, but make sure they're off anyway // (Using same hardware config as blink12.c) for (i = 3 ; i < 8 ; ++i) { pinMode (i, OUTPUT) ; digitalWrite (i, 0) ; } // Setup the inputs for (i = 0 ; i < 3 ; ++i) { pinMode (i, INPUT) ; pullUpDnControl (i, PUD_UP) ; leds [i] = 0 ; } for (;;) { for (i = 0 ; i < 3 ; ++i) scanButton (i) ; delay (1) ; } }