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:
13:09b53a088a9c
Parent:
10:cb16d2957f8d
Child:
14:da09706b92f5

File content as of revision 13:09b53a088a9c:

/**
* DebouncedInterrupt.cpp
**/
#include "DebouncedInterrupt.h"

Timeout timeout;

DebouncedInterrupt::DebouncedInterrupt(PinName pin)
{
    _in = new InterruptIn(pin);
}

DebouncedInterrupt::~DebouncedInterrupt()
{
}

void DebouncedInterrupt::attach(void (*fptr)(void), 
                                       const interruptTrigger& trigger,
                                       const unsigned int& debounce_ms)
{
    if(fptr) {
        fCallback = fptr;
        _last_bounce_count = _bounce_count = 0;
        
        switch(trigger) {
         case INT_RISE:
            _in->rise(this, &DebouncedInterrupt::_onInterrupt);
            break;
         case INT_FALL:
            _in->fall(this, &DebouncedInterrupt::_onInterrupt);
            break;
         default:
            break;
        }
    
        _debounce_us = 1000*debounce_ms;
    }
}

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;
    fCallback();
}

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