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103 lines
2.7 KiB
103 lines
2.7 KiB
/* |
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* buttons.c: |
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* Simple test for the PiFace interface board. |
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* |
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* Read the buttons and output the same to the 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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#include <piFace.h> |
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int outputs [4] = { 0,0,0,0 } ; |
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// Use 200 as the pin-base for the PiFace board |
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#define PIFACE_BASE 200 |
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/* |
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* scanButton: |
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* Read the guiven button - if it's pressed, then flip the state |
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* of the correspoinding output pin |
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********************************************************************************* |
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*/ |
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void scanButton (int button) |
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{ |
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if (digitalRead (PIFACE_BASE + button) == LOW) |
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{ |
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outputs [button] ^= 1 ; |
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digitalWrite (PIFACE_BASE + button, outputs [button]) ; |
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printf ("Button %d pushed - output now: %s\n", |
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button, (outputs [button] == 0) ? "Off" : "On") ; |
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} |
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while (digitalRead (PIFACE_BASE + button) == LOW) |
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delay (1) ; |
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} |
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/* |
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* start here |
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********************************************************************************* |
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*/ |
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int main (void) |
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{ |
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int pin, button ; |
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printf ("Raspberry Pi wiringPi + PiFace test program\n") ; |
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printf ("===========================================\n") ; |
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printf ("\n") ; |
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printf ( |
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"This program reads the buttons and uses them to toggle the first 4\n" |
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"outputs. Push a button once to turn an output on, and push it again to\n" |
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"turn it off again.\n\n") ; |
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// Always initialise wiringPi. Use wiringPiSys() if you don't need |
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// (or want) to run as root |
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wiringPiSetupSys () ; |
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piFaceSetup (PIFACE_BASE) ; |
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// Enable internal pull-ups & start with all off |
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for (pin = 0 ; pin < 8 ; ++pin) |
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{ |
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pullUpDnControl (PIFACE_BASE + pin, PUD_UP) ; |
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digitalWrite (PIFACE_BASE + pin, 0) ; |
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} |
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// Loop, scanning the buttons |
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for (;;) |
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{ |
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for (button = 0 ; button < 4 ; ++button) |
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scanButton (button) ; |
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delay (5) ; |
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} |
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return 0 ; |
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}
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