Nick Restivo / PwmIn

Changes the duty cycle function such that when no signal is received, it will output 0.0 instead of the last value detected. Feel free to let me know if this is a useless change.

Dependents:   ParamotorControl

PwmIn.h@2:65fd472f6314, 2018-12-13 (annotated)

Committer:
bignick26
Date:
Thu Dec 13 21:28:56 2018 +0000
Revision:
2:65fd472f6314
Parent:
1:6d68eb9b6bbb 
Changed the definition of how to receive a PWM input such that when no signal is received, the output of the function dutycycle() is 0.0, instead of holding the last value received.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
simon 1:6d68eb9b6bbb 1 /* mbed PwmIn Library
simon 1:6d68eb9b6bbb 2 * Copyright (c) 2008-2010, sford
simon 1:6d68eb9b6bbb 3 *
simon 1:6d68eb9b6bbb 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
simon 1:6d68eb9b6bbb 5 * of this software and associated documentation files (the "Software"), to deal
simon 1:6d68eb9b6bbb 6 * in the Software without restriction, including without limitation the rights
simon 1:6d68eb9b6bbb 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
simon 1:6d68eb9b6bbb 8 * copies of the Software, and to permit persons to whom the Software is
simon 1:6d68eb9b6bbb 9 * furnished to do so, subject to the following conditions:
simon 1:6d68eb9b6bbb 10 *
simon 1:6d68eb9b6bbb 11 * The above copyright notice and this permission notice shall be included in
simon 1:6d68eb9b6bbb 12 * all copies or substantial portions of the Software.
simon 1:6d68eb9b6bbb 13 *
simon 1:6d68eb9b6bbb 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
simon 1:6d68eb9b6bbb 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
simon 1:6d68eb9b6bbb 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
simon 1:6d68eb9b6bbb 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
simon 1:6d68eb9b6bbb 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
simon 1:6d68eb9b6bbb 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
simon 1:6d68eb9b6bbb 20 * THE SOFTWARE.
simon 1:6d68eb9b6bbb 21 */
simon 1:6d68eb9b6bbb 22
simon 1:6d68eb9b6bbb 23 #ifndef MBED_PWMIN_H
simon 1:6d68eb9b6bbb 24 #define MBED_PWMIN_H
simon 1:6d68eb9b6bbb 25
simon 1:6d68eb9b6bbb 26 #include "mbed.h"
simon 1:6d68eb9b6bbb 27
simon 1:6d68eb9b6bbb 28 /** PwmIn class to read PWM inputs
simon 1:6d68eb9b6bbb 29 *
simon 1:6d68eb9b6bbb 30 * Uses InterruptIn to measure the changes on the input
simon 1:6d68eb9b6bbb 31 * and record the time they occur
simon 1:6d68eb9b6bbb 32 *
simon 1:6d68eb9b6bbb 33 * @note uses InterruptIn, so not available on p19/p20
simon 1:6d68eb9b6bbb 34 */
simon 1:6d68eb9b6bbb 35 class PwmIn {
simon 1:6d68eb9b6bbb 36 public:
simon 1:6d68eb9b6bbb 37 /** Create a PwmIn
simon 1:6d68eb9b6bbb 38 *
simon 1:6d68eb9b6bbb 39 * @param p The pwm input pin (must support InterruptIn)
simon 1:6d68eb9b6bbb 40 */
simon 1:6d68eb9b6bbb 41 PwmIn(PinName p);
simon 1:6d68eb9b6bbb 42
simon 1:6d68eb9b6bbb 43 /** Read the current period
simon 1:6d68eb9b6bbb 44 *
simon 1:6d68eb9b6bbb 45 * @returns the period in seconds
simon 1:6d68eb9b6bbb 46 */
simon 1:6d68eb9b6bbb 47 float period();
simon 1:6d68eb9b6bbb 48
simon 1:6d68eb9b6bbb 49 /** Read the current pulsewidth
simon 1:6d68eb9b6bbb 50 *
simon 1:6d68eb9b6bbb 51 * @returns the pulsewidth in seconds
simon 1:6d68eb9b6bbb 52 */
simon 1:6d68eb9b6bbb 53 float pulsewidth();
simon 1:6d68eb9b6bbb 54
simon 1:6d68eb9b6bbb 55 /** Read the current dutycycle
simon 1:6d68eb9b6bbb 56 *
simon 1:6d68eb9b6bbb 57 * @returns the dutycycle as a percentage, represented between 0.0-1.0
simon 1:6d68eb9b6bbb 58 */
simon 1:6d68eb9b6bbb 59 float dutycycle();
simon 1:6d68eb9b6bbb 60
simon 1:6d68eb9b6bbb 61 protected:
simon 1:6d68eb9b6bbb 62 void rise();
simon 1:6d68eb9b6bbb 63 void fall();
simon 1:6d68eb9b6bbb 64
simon 1:6d68eb9b6bbb 65 InterruptIn _p;
simon 1:6d68eb9b6bbb 66 Timer _t;
simon 1:6d68eb9b6bbb 67 float _pulsewidth, _period;
simon 1:6d68eb9b6bbb 68 };
simon 1:6d68eb9b6bbb 69
simon 1:6d68eb9b6bbb 70 #endif