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) {} }
Revision 18:e6e9bc6402b7, committed 2014-02-19
- Comitter:
- kandangath
- Date:
- Wed Feb 19 01:47:45 2014 +0000
- Parent:
- 17:96a51b236ba0
- Child:
- 19:d12a5b89ac3a
- Commit message:
- Support checking rise and fall of signals
Changed in this revision
DebouncedInterrupt.cpp | Show annotated file Show diff for this revision Revisions of this file |
DebouncedInterrupt.h | Show annotated file Show diff for this revision Revisions of this file |
--- 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(); } }
--- a/DebouncedInterrupt.h Tue Feb 18 20:38:50 2014 +0000 +++ b/DebouncedInterrupt.h Wed Feb 19 01:47:45 2014 +0000 @@ -15,7 +15,7 @@ * * int main() * { - * up_button.attach(&onUp, 100); + * up_button.attach(&onUp,IRQ_FALL, 100); * while(1) { * ... * } @@ -29,11 +29,20 @@ #include <stdint.h> #include "mbed.h" +/** +typedef enum { + IRQ_NONE, + IRQ_RISE, + IRQ_FALL +} gpio_irq_event; +**/ + class DebouncedInterrupt { private: unsigned int _debounce_us; InterruptIn *_in; DigitalIn *_din; + gpio_irq_event _trigger; // Diagnostics volatile unsigned int _bounce_count; @@ -47,7 +56,7 @@ ~DebouncedInterrupt(); // Start monitoring the interupt and attach a callback - void attach(void (*fptr)(void), const uint32_t& debounce_ms=10); + void attach(void (*fptr)(void), const gpio_irq_event trigger, const uint32_t& debounce_ms=10); // Stop monitoring the interrupt void reset();