An interface to read a PWM input signal, using InterruptIn
Dependents: PwmIn_HelloWorld PwmIn_ModSerial CHR6dm_reading tugboat ... more
PwmIn.cpp
- Committer:
- simon
- Date:
- 2010-09-02
- Revision:
- 1:6d68eb9b6bbb
File content as of revision 1:6d68eb9b6bbb:
/* mbed PwmIn Library * Copyright (c) 2008-2010, sford * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include "PwmIn.h" PwmIn::PwmIn(PinName p) : _p(p) { _p.rise(this, &PwmIn::rise); _p.fall(this, &PwmIn::fall); _period = 0.0; _pulsewidth = 0.0; _t.start(); } float PwmIn::period() { return _period; } float PwmIn::pulsewidth() { return _pulsewidth; } float PwmIn::dutycycle() { return _pulsewidth / _period; } void PwmIn::rise() { _period = _t.read(); _t.reset(); } void PwmIn::fall() { _pulsewidth = _t.read(); }