| /* |
| * softTone.c: |
| * For that authentic retro sound... |
| * Er... A little experiment to produce tones out of a Pi using |
| * one (or 2) GPIO pins and a piezeo "speaker" element. |
| * (Or a high impedance speaker, but don'y blame me if you blow-up |
| * the GPIO pins!) |
| * Copyright (c) 2012 Gordon Henderson |
| *********************************************************************** |
| * This file is part of wiringPi: |
| * https://projects.drogon.net/raspberry-pi/wiringpi/ |
| * |
| * wiringPi is free software: you can redistribute it and/or modify |
| * it under the terms of the GNU Lesser General Public License as |
| * published by the Free Software Foundation, either version 3 of the |
| * License, or (at your option) any later version. |
| * |
| * wiringPi is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with wiringPi. |
| * If not, see <http://www.gnu.org/licenses/>. |
| *********************************************************************** |
| */ |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| extern int softToneCreate (int pin) ; |
| extern void softToneWrite (int pin, int frewq) ; |
| |
| #ifdef __cplusplus |
| } |
| #endif |