112 lines
2.6 KiB
C
112 lines
2.6 KiB
C
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/*
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* metronome.c:
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* Simple test for the PiFace interface board.
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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 <stdlib.h>
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#include <string.h>
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#include <wiringPi.h>
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#include <piFace.h>
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#define PIFACE 200
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/*
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* middleA:
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* Play middle A (on the relays - yea!)
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*********************************************************************************
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*/
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static void middleA (void)
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{
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unsigned int next ;
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for (;;)
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{
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next = micros () + 1136 ;
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digitalWrite (PIFACE + 0, 0) ;
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digitalWrite (PIFACE + 1, 0) ;
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while (micros () < next)
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delayMicroseconds (1) ;
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next = micros () + 1137 ;
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digitalWrite (PIFACE + 0, 1) ;
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digitalWrite (PIFACE + 1, 1) ;
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while (micros () < next)
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delayMicroseconds (1) ;
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}
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}
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int main (int argc, char *argv [])
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{
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int bpm, msPerBeat, state = 0 ;
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unsigned int end ;
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printf ("Raspberry Pi PiFace Metronome\n") ;
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printf ("=============================\n") ;
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piHiPri (50) ;
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wiringPiSetupSys () ; // Needed for timing functions
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piFaceSetup (PIFACE) ;
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if (argc != 2)
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{
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printf ("Usage: %s <beates per minute>\n", argv [0]) ;
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exit (1) ;
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}
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if (strcmp (argv [1], "a") == 0)
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middleA () ;
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bpm = atoi (argv [1]) ;
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if ((bpm < 40) || (bpm > 208))
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{
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printf ("%s range is 40 through 208 beats per minute\n", argv [0]) ;
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exit (1) ;
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}
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msPerBeat = 60000 / bpm ;
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// Main loop:
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// Put some random LED pairs up for a few seconds, then blank ...
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for (;;)
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{
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end = millis () + msPerBeat ;
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digitalWrite (PIFACE + 0, state) ;
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digitalWrite (PIFACE + 1, state) ;
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while (millis () < end)
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delayMicroseconds (500) ;
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state ^= 1 ;
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}
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return 0 ;
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}
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