Debounce InterruptIn
Dependents: led_sigfox Allumag_lampe_sigfox Case_study_02_Turnstile B18_MP3_PLAYER ... more
DebouncedInterrupt.cpp
- Committer:
- kandangath
- Date:
- 2014-02-19
- Revision:
- 18:e6e9bc6402b7
- Parent:
- 17:96a51b236ba0
- Child:
- 19:d12a5b89ac3a
File content as of revision 18:e6e9bc6402b7:
/** * DebouncedInterrupt.cpp **/ #include "DebouncedInterrupt.h" Timeout timeout; DebouncedInterrupt::DebouncedInterrupt(PinName pin) { _in = new InterruptIn(pin); _din = new DigitalIn(pin); } DebouncedInterrupt::~DebouncedInterrupt() { delete _in; delete _din; } void DebouncedInterrupt::attach(void (*fptr)(void), const gpio_irq_event trigger, const unsigned int& debounce_ms) { if(fptr) { fCallback = fptr; _last_bounce_count = _bounce_count = 0; _debounce_us = 1000*debounce_ms; _trigger = trigger; switch(trigger) { case IRQ_RISE: _in->rise(this, &DebouncedInterrupt::_onInterrupt); break; case IRQ_FALL: _in->fall(this, &DebouncedInterrupt::_onInterrupt); break; case IRQ_NONE: reset(); // Unexpected. Clear callbacks. break; } } else { reset(); } } void DebouncedInterrupt::reset() { timeout.detach(); } unsigned int DebouncedInterrupt::get_bounce() { return _last_bounce_count; } void DebouncedInterrupt::_callback() { _last_bounce_count = _bounce_count; _bounce_count = 0; unsigned int expected_state = (_trigger==IRQ_RISE)?1:0; if(_din->read() == expected_state) { fCallback(); } } void DebouncedInterrupt::_onInterrupt() { _bounce_count++; timeout.attach_us(this, &DebouncedInterrupt::_callback, _debounce_us); }