The library can flash an LED or DigitalOut pin at 50% duty using a Ticker interrupt triggered toggle function. This library does NOT use wait() so that it can flash a pin while more code is being executed. Instead, it relies on Ticker generated interrupts. There is only one parameter required, the on/off time of the pin in seconds (i.e. 0.5 means 0.5 seconds on and 0.5 seconds off).
ToggleFlash.cpp
- Committer:
- PennElectric
- Date:
- 2012-12-22
- Revision:
- 0:32fa44559a40
- Child:
- 3:dbd7ab16f171
File content as of revision 0:32fa44559a40:
/* Copyright (c) <2012> <P. Patel>, MIT License * * 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 "mbed.h" #include "ToggleFlash.h" void ToggleFlash::toggle() { _pin = !_pin; // Toggle pin } ToggleFlash::ToggleFlash(PinName pin) : _pin(pin) { _pin = 0; // Drive pin low on startup } ToggleFlash::ToggleFlash(PinName pin, float time) : _pin(pin) { _pin = 0; // Drive pin low on startup _time = time; // Set given time } void ToggleFlash::setTime(float time) { if (_time == time) return; // Do nothing if time already correct _time = time; // Set new time if (_flasherState != 0) { // Refresh the flasher if it was currently flashing _flasher.detach(); _flasher.attach(this, &ToggleFlash::toggle, _time); } } float ToggleFlash::getTime() { return _time; // Return current time setting } void ToggleFlash::enable() { if (_flasherState != 0) return; // Do nothing if its already flashing _flasher.attach(this, &ToggleFlash::toggle, _time); // Else attach current time setting _flasherState = 1; // Update state tracker } void ToggleFlash::disableTo(int state) { _flasher.detach(); // Stop flashing _flasherState = 0; // Update state tracker _pin = state; // Drive pin to state } int ToggleFlash::readFlasher() { return _flasherState; // Return state of the flasher } int ToggleFlash::read() { return _pin; // Return state of the pin }