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).
Diff: ToggleFlash.h
- Revision:
- 3:dbd7ab16f171
- Parent:
- 2:fddd1a6486bd
--- a/ToggleFlash.h Sat Dec 22 21:19:15 2012 +0000 +++ b/ToggleFlash.h Sun Dec 23 05:07:44 2012 +0000 @@ -1,103 +1,103 @@ -/* 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. - */ - - // ----------------------------- LED Ticker Interrupt Flasher ----------------------------------- - -#ifndef ToggleFlash -#define ToggleFlash - -#include "mbed.h" - -/** LED Toggle-Flashing (50% duty) library based on Ticker interrupts instead of wait - * - * Example - * @code - * ToggleFlash myflasher(p20, 1.5); // A flasher object attached to pin 20 with 1.5 second timing - * - * int main() { - * while (1) { - * myflasher.enable(); // Turn on flasher - * - * wait(3); // More code, simulated by wait - * myflasher.disableTo(1); // Hold pin high - myflasher.setTime(2); // Set new timing - wait(3); - myflasher.enable(); // Resume flashing - wait(3); - myflasher = 0; // Hold pin low (shorthand for disableTo(int state)) - * } - * } - * @endcode - */ -class ToggleFlash{ -public: - /** Create a ToggleFlasher object connected to a pin - * @param pin The pin to which the ToggleFlasher is attached - */ - ToggleFlash(PinName pin); - /** Create a ToggleFlasher object connected to a pin and set the on-off time - * @param pin The pin to which the ToggleFlasher is attached - * @param time The specified on-off time in seconds - */ - ToggleFlash(PinName pin, float time); - /** Set the on-off time ex. 1.5 means on for 1.5 seconds off for 1.5 seconds - * @param time The specified on-off time in seconds - */ - void setTime(float time); - /** Retrieve the current time setting of the flasher object - * @returns The current on-off time of the ToggleFlash object - */ - float getTime(); - /** Enable the flasher to start toggling pin - * - */ - void enable(); - /** Disable the flasher and give the pin a constant state - * @param state 1 or 0 for constant on or constant off - */ - void disableTo(int state); - /** Return the current status of the flasher - * @returns 1 or 0 for flasher enabled or flasher disabled - */ - int readFlasher(); - /** Return the current state of the pin - * @returns 1 or 0 for currently set high or low - */ - int read(); -#ifdef MBED_OPERATORS - /** An operator shorthand for disableTo(int state) to give the pin a constant state - */ - ToggleFlash& operator= (int state) { - disableTo(state); - return *this; - } - /** An operator shorthand for read() to read pin's current state - */ - operator int() { - return read(); - } - #endif -private: - DigitalOut _pin; - int _flasherState; - float _time; - Ticker _flasher; - void toggle(); -}; - +/* 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. + */ + + // ----------------------------- LED Ticker Interrupt Flasher ----------------------------------- + +#ifndef TOGGLE +#define TOGGLE + +#include "mbed.h" + +/** LED Toggle-Flashing (50% duty) library based on Ticker interrupts instead of wait + * + * Example + * @code + * Flasher myflasher(p20, 1.5); // A flasher object attached to pin 20 with 1.5 second timing + * + * int main() { + * while (1) { + * myflasher.enable(); // Turn on flasher + * + * wait(3); // More code, simulated by wait + * myflasher.disableTo(1); // Hold pin high + myflasher.setTime(2); // Set new timing + wait(3); + myflasher.enable(); // Resume flashing + wait(3); + myflasher = 0; // Hold pin low (shorthand for disableTo(int state)) + * } + * } + * @endcode + */ +class ToggleFlash { +public: + /** Create a Flasherer object connected to a pin + * @param pin The pin to which the Flasherer is attached + */ + ToggleFlash(PinName pin); + /** Create a Flasherer object connected to a pin and set the on-off time + * @param pin The pin to which the Flasherer is attached + * @param time The specified on-off time in seconds + */ + ToggleFlash(PinName pin, float time); + /** Set the on-off time ex. 1.5 means on for 1.5 seconds off for 1.5 seconds + * @param time The specified on-off time in seconds + */ + void setTime(float time); + /** Retrieve the current time setting of the flasher object + * @returns The current on-off time of the Flasher object + */ + float getTime(); + /** Enable the flasher to start toggling pin + * + */ + void enable(); + /** Disable the flasher and give the pin a constant state + * @param state 1 or 0 for constant on or constant off + */ + void disableTo(int state); + /** Return the current status of the flasher + * @returns 1 or 0 for flasher enabled or flasher disabled + */ + int readFlasher(); + /** Return the current state of the pin + * @returns 1 or 0 for currently set high or low + */ + int read(); +#ifdef MBED_OPERATORS + /** An operator shorthand for disableTo(int state) to give the pin a constant state + */ + ToggleFlash& operator= (int state) { + disableTo(state); + return *this; + } + /** An operator shorthand for read() to read pin's current state + */ + operator int() { + return read(); + } + #endif +private: + DigitalOut _pin; + int _flasherState; + float _time; + Ticker _flasher; + void toggle(); +}; + #endif \ No newline at end of file