| Gordon Henderson | 25e4ec5 | 2012-12-06 21:49:41 +0000 | [diff] [blame] | 1 | /* |
| 2 | * softTone.c: |
| 3 | * For that authentic retro sound... |
| 4 | * Er... A little experiment to produce tones out of a Pi using |
| 5 | * one (or 2) GPIO pins and a piezeo "speaker" element. |
| 6 | * (Or a high impedance speaker, but don'y blame me if you blow-up |
| 7 | * the GPIO pins!) |
| 8 | * Copyright (c) 2012 Gordon Henderson |
| 9 | *********************************************************************** |
| 10 | * This file is part of wiringPi: |
| 11 | * https://projects.drogon.net/raspberry-pi/wiringpi/ |
| 12 | * |
| 13 | * wiringPi is free software: you can redistribute it and/or modify |
| 14 | * it under the terms of the GNU Lesser General Public License as |
| 15 | * published by the Free Software Foundation, either version 3 of the |
| 16 | * License, or (at your option) any later version. |
| 17 | * |
| 18 | * wiringPi is distributed in the hope that it will be useful, |
| 19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 21 | * GNU Lesser General Public License for more details. |
| 22 | * |
| 23 | * You should have received a copy of the GNU Lesser General Public |
| 24 | * License along with wiringPi. |
| 25 | * If not, see <http://www.gnu.org/licenses/>. |
| 26 | *********************************************************************** |
| 27 | */ |
| 28 | |
| 29 | #ifdef __cplusplus |
| 30 | extern "C" { |
| 31 | #endif |
| 32 | |
| 33 | extern int softToneCreate (int pin) ; |
| 34 | extern void softToneWrite (int pin, int frewq) ; |
| 35 | |
| 36 | #ifdef __cplusplus |
| 37 | } |
| 38 | #endif |