A replacement for InterruptIn that debounces the interrupt.
Dependents: D7A_Demo-Get-started CVtoOSCConverter EE3501keypad D7A_Localisation ... more
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Example code:
#include "DebouncedInterrupt.h" DebouncedInterrupt up_button(USER_BUTTON); void onUp() { // Do Something } int main() { // Will immediatly call function and ignore other interrupts until timeout up_button.attach(&onUp, IRQ_FALL, 1000, true); // Will call function only if button has been held for the specified time //up_button.attach(&onUp, IRQ_FALL, 500, false); while(1) {} }
DebouncedInterrupt.cpp
- Committer:
- Jeej
- Date:
- 2017-04-27
- Revision:
- 26:2df374d23986
- Parent:
- 25:2163ebb21aef
File content as of revision 26:2df374d23986:
/** * DebouncedInterrupt.cpp **/ #include "DebouncedInterrupt.h" DebouncedInterrupt::DebouncedInterrupt(PinName pin) { _in = new InterruptIn(pin); _din = new DigitalIn(pin, PullUp); _timeout = new Timeout; } DebouncedInterrupt::~DebouncedInterrupt() { delete _in; delete _din; delete _timeout; } void DebouncedInterrupt::attach(void (*fptr)(void), const gpio_irq_event trigger, const uint32_t debounce_ms, bool immediate) { if(fptr) { _callback = callback(fptr); _last_bounce_count = _bounce_count = 0; _debounce_us = 1000*debounce_ms; _trigger = trigger; _timeout_expired = true; _immediate = immediate; switch(trigger) { case IRQ_RISE: _in->rise(callback(this, &DebouncedInterrupt::_onInterrupt)); break; case IRQ_FALL: _in->fall(callback(this, &DebouncedInterrupt::_onInterrupt)); break; case IRQ_NONE: reset(); // Unexpected. Clear callbacks. break; } } else { reset(); } } void DebouncedInterrupt::reset() { _timeout->detach(); _timeout_expired = true; } unsigned int DebouncedInterrupt::get_bounce() { return _last_bounce_count; } void DebouncedInterrupt::_onCallback() { _last_bounce_count = _bounce_count; _bounce_count = 0; if (!_immediate) { if (_din->read() == (_trigger==IRQ_RISE)) { _callback.call(); } } _timeout_expired = true; } void DebouncedInterrupt::_onInterrupt() { _bounce_count++; if (_immediate) { if (_timeout_expired) { _timeout_expired = false; _callback.call(); _timeout->attach_us(callback(this, &DebouncedInterrupt::_onCallback), _debounce_us); } } else { _timeout->attach_us(callback(this, &DebouncedInterrupt::_onCallback), _debounce_us); } }