40 lines
1.4 KiB
C
40 lines
1.4 KiB
C
/*
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* softTone.c:
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* For that authentic retro sound...
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* Er... A little experiment to produce tones out of a Pi using
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* one (or 2) GPIO pins and a piezeo "speaker" element.
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* (Or a high impedance speaker, but don'y blame me if you blow-up
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* the GPIO pins!)
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* Copyright (c) 2012 Gordon Henderson
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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
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* published by the Free Software Foundation, either version 3 of the
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* License, or (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
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* License along with wiringPi.
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* If not, see <http://www.gnu.org/licenses/>.
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***********************************************************************
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern int softToneCreate (int pin) ;
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extern void softToneStop (int pin) ;
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extern void softToneWrite (int pin, int freq) ;
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#ifdef __cplusplus
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}
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#endif
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