An interface to read a PWM input signal, using InterruptIn
Dependents: PwmIn_HelloWorld PwmIn_ModSerial CHR6dm_reading tugboat ... more
PwmIn.cpp
00001 /* mbed PwmIn Library 00002 * Copyright (c) 2008-2010, sford 00003 * 00004 * Permission is hereby granted, free of charge, to any person obtaining a copy 00005 * of this software and associated documentation files (the "Software"), to deal 00006 * in the Software without restriction, including without limitation the rights 00007 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 00008 * copies of the Software, and to permit persons to whom the Software is 00009 * furnished to do so, subject to the following conditions: 00010 * 00011 * The above copyright notice and this permission notice shall be included in 00012 * all copies or substantial portions of the Software. 00013 * 00014 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 00015 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 00016 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 00017 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 00018 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 00019 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 00020 * THE SOFTWARE. 00021 */ 00022 00023 #include "PwmIn.h" 00024 00025 PwmIn::PwmIn(PinName p) : _p(p) { 00026 _p.rise(this, &PwmIn::rise); 00027 _p.fall(this, &PwmIn::fall); 00028 _period = 0.0; 00029 _pulsewidth = 0.0; 00030 _t.start(); 00031 } 00032 00033 float PwmIn::period() { 00034 return _period; 00035 } 00036 00037 float PwmIn::pulsewidth() { 00038 return _pulsewidth; 00039 } 00040 00041 float PwmIn::dutycycle() { 00042 return _pulsewidth / _period; 00043 } 00044 00045 void PwmIn::rise() { 00046 _period = _t.read(); 00047 _t.reset(); 00048 } 00049 00050 void PwmIn::fall() { 00051 _pulsewidth = _t.read(); 00052 }
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