Output PWM on any pin. Partly based on SoftPWM with some improvements
Revision 0:813ee8141cdd, committed 2015-09-03
- Comitter:
- gagarcr
- Date:
- Thu Sep 03 08:15:34 2015 +0000
- Commit message:
- Intial version based on SoftPWM
Changed in this revision
SoftPwmOut.cpp | Show annotated file Show diff for this revision Revisions of this file |
SoftPwmOut.h | Show annotated file Show diff for this revision Revisions of this file |
diff -r 000000000000 -r 813ee8141cdd SoftPwmOut.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/SoftPwmOut.cpp Thu Sep 03 08:15:34 2015 +0000 @@ -0,0 +1,83 @@ +#include "mbed.h" +#include "InterruptIn.h" +#include "SoftPwmOut.h" + +SoftPwmOut::SoftPwmOut(PinName pin) : _outPin(pin) // Constructor definition. Assign _out +{ + _interval = 0.1; // Default fequency + _width = 0; + start(); +} + +float SoftPwmOut::read() +{ + return _width / _interval; +} + +void SoftPwmOut::write(float duty) +{ + _width = _interval * duty; + if ( duty <= 0.0 ) _width = 0.0; + if ( duty > 1.0 ) _width = _interval; +} + +void SoftPwmOut::start() +{ + _ticker.attach(this,&SoftPwmOut::TickerInterrupt,_interval); +} + +void SoftPwmOut::stop() +{ + _ticker.detach(); + //wait(width); +} + +void SoftPwmOut::period(float period) +{ + _interval = period; + start(); +} + +void SoftPwmOut::period_ms(int period) +{ + SoftPwmOut::period((float)period / 1000); + start(); +} + +void SoftPwmOut::period_us(int period) +{ + SoftPwmOut::period((float)period / 1000000); + start(); +} + +void SoftPwmOut::pulsewidth(float width) +{ + _width = width; + if ( _width < 0.0 ) _width = 0.0; + if ( _width > _interval) _width = _interval; +} + +void SoftPwmOut::pulsewidth_ms(int width) +{ + SoftPwmOut::pulsewidth((float)width / 1000); +} + +void SoftPwmOut::pulsewidth_us(int width) +{ + SoftPwmOut::pulsewidth((float)width / 1000000); +} + +void SoftPwmOut::TickerInterrupt() +{ + _outPin = 0; + if ( _width <= 0 ) return; + _timeout.attach(this,&SoftPwmOut::end,_width); +} + +void SoftPwmOut::end() +{ + _outPin = 1; +// _timeout.detach(); +} +; +
diff -r 000000000000 -r 813ee8141cdd SoftPwmOut.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/SoftPwmOut.h Thu Sep 03 08:15:34 2015 +0000 @@ -0,0 +1,45 @@ +#ifndef SoftPWM_H +#define SoftPWM_H +#define POSITIVE true +#define NEGATIVE false + +#include "mbed.h" + +class SoftPwmOut +{ +public: + SoftPwmOut(PinName); +// void attach_us(int); + void start(); + void write(float); + float read(); + void pulsewidth(float); + void pulsewidth_ms(int); + void pulsewidth_us(int); + void period(float); + void period_ms(int); + void period_us(int); + void stop(); + operator float() { + if ( _width <= 0.0 ) return 0.0; + if ( _width > 1.0 ) return 1.0; + return _width / _interval; + } + SoftPwmOut& operator=(float duty) { + _width = _interval * duty; + if ( duty <= 0.0 ) _width = 0.0; + if ( duty > 1.0 ) _width = _interval; + return *this; + } + +private: + Timeout _timeout; + Ticker _ticker; + void TickerInterrupt(); + void end(); + DigitalOut _outPin; + float _width; + float _interval; + +}; +#endif \ No newline at end of file