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) {}
}

Diff: DebouncedInterrupt.cpp

Revision:
18:e6e9bc6402b7
Parent:
17:96a51b236ba0
Child:
19:d12a5b89ac3a
--- a/DebouncedInterrupt.cpp	Tue Feb 18 20:38:50 2014 +0000
+++ b/DebouncedInterrupt.cpp	Wed Feb 19 01:47:45 2014 +0000
@@ -17,15 +17,28 @@
     delete _din;
 }
 
-void DebouncedInterrupt::attach(void (*fptr)(void), const unsigned int& debounce_ms)
+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;
         
-        _in->rise(this, &DebouncedInterrupt::_onInterrupt);
-        _in->fall(this, &DebouncedInterrupt::_onInterrupt);
+        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();
     }
 }
 
@@ -43,7 +56,8 @@
 {
     _last_bounce_count = _bounce_count;
     _bounce_count = 0;
-    if(_din->read()) {
+    unsigned int expected_state = (_trigger==IRQ_RISE)?1:0;
+    if(_din->read() == expected_state) {
         fCallback();
     }
 }