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