WizziLab / DebouncedInterrupt

A replacement for InterruptIn that debounces the interrupt.

Dependents:   D7A_Demo-Get-started CVtoOSCConverter EE3501keypad D7A_Localisation ... more

Fork of DebouncedInterrupt by Anil Kandangath

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:
kandangath
Date:
2014-02-18
Revision:
17:96a51b236ba0
Parent:
14:da09706b92f5
Child:
18:e6e9bc6402b7

File content as of revision 17:96a51b236ba0:

/**
* 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 unsigned int& debounce_ms)
{
    if(fptr) {
        fCallback = fptr;
        _last_bounce_count = _bounce_count = 0;
        _debounce_us = 1000*debounce_ms;
        
        _in->rise(this, &DebouncedInterrupt::_onInterrupt);
        _in->fall(this, &DebouncedInterrupt::_onInterrupt);
    }
}

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;
    if(_din->read()) {
        fCallback();
    }
}

void DebouncedInterrupt::_onInterrupt()
{
    _bounce_count++;
    timeout.attach_us(this, &DebouncedInterrupt::_callback, _debounce_us);
}