Debounce InterruptIn
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DebouncedInterrupt.h@22:9733f886810a, 2014-02-25 (annotated)
- Committer:
- kandangath
- Date:
- Tue Feb 25 23:44:37 2014 +0000
- Revision:
- 22:9733f886810a
- Parent:
- 21:34b95e1b2bf3
Modifications to template version for member functions
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
kandangath | 20:996ea2fc8d2d | 1 | |
kandangath | 20:996ea2fc8d2d | 2 | #ifndef DEBOUNCED_INTERRUPT_H |
kandangath | 20:996ea2fc8d2d | 3 | #define DEBOUNCED_INTERRUPT_H |
kandangath | 20:996ea2fc8d2d | 4 | |
kandangath | 20:996ea2fc8d2d | 5 | #include <stdint.h> |
kandangath | 20:996ea2fc8d2d | 6 | #include "mbed.h" |
kandangath | 22:9733f886810a | 7 | #include "FunctionPointer.h" |
kandangath | 20:996ea2fc8d2d | 8 | |
kandangath | 20:996ea2fc8d2d | 9 | /** |
kandangath | 20:996ea2fc8d2d | 10 | typedef enum { |
kandangath | 20:996ea2fc8d2d | 11 | IRQ_NONE, |
kandangath | 20:996ea2fc8d2d | 12 | IRQ_RISE, |
kandangath | 20:996ea2fc8d2d | 13 | IRQ_FALL |
kandangath | 20:996ea2fc8d2d | 14 | } gpio_irq_event; |
kandangath | 20:996ea2fc8d2d | 15 | **/ |
kandangath | 0:ca5a0fee9f52 | 16 | |
kandangath | 15:948e85b22efe | 17 | /** A replacement for InterruptIn that debounces the interrupt |
kandangath | 15:948e85b22efe | 18 | * |
kandangath | 20:996ea2fc8d2d | 19 | * Example: |
kandangath | 15:948e85b22efe | 20 | * @code |
kandangath | 15:948e85b22efe | 21 | * |
kandangath | 15:948e85b22efe | 22 | * #include "DebouncedInterrupt.h" |
kandangath | 15:948e85b22efe | 23 | * |
kandangath | 15:948e85b22efe | 24 | * DebouncedInterrupt up_button(p15); |
kandangath | 15:948e85b22efe | 25 | * |
kandangath | 15:948e85b22efe | 26 | * void onUp() |
kandangath | 15:948e85b22efe | 27 | * { |
kandangath | 15:948e85b22efe | 28 | * // Do Something |
kandangath | 15:948e85b22efe | 29 | * } |
kandangath | 15:948e85b22efe | 30 | * |
kandangath | 15:948e85b22efe | 31 | * int main() |
kandangath | 15:948e85b22efe | 32 | * { |
kandangath | 18:e6e9bc6402b7 | 33 | * up_button.attach(&onUp,IRQ_FALL, 100); |
kandangath | 15:948e85b22efe | 34 | * while(1) { |
kandangath | 15:948e85b22efe | 35 | * ... |
kandangath | 15:948e85b22efe | 36 | * } |
kandangath | 15:948e85b22efe | 37 | * } |
kandangath | 15:948e85b22efe | 38 | * @endcode |
kandangath | 15:948e85b22efe | 39 | */ |
kandangath | 10:cb16d2957f8d | 40 | class DebouncedInterrupt { |
kandangath | 0:ca5a0fee9f52 | 41 | private: |
kandangath | 7:2d73e219dadf | 42 | unsigned int _debounce_us; |
kandangath | 10:cb16d2957f8d | 43 | InterruptIn *_in; |
kandangath | 14:da09706b92f5 | 44 | DigitalIn *_din; |
kandangath | 18:e6e9bc6402b7 | 45 | gpio_irq_event _trigger; |
kandangath | 7:2d73e219dadf | 46 | |
kandangath | 13:09b53a088a9c | 47 | // Diagnostics |
kandangath | 13:09b53a088a9c | 48 | volatile unsigned int _bounce_count; |
kandangath | 13:09b53a088a9c | 49 | volatile unsigned int _last_bounce_count; |
kandangath | 13:09b53a088a9c | 50 | |
kandangath | 3:e4b7033508d1 | 51 | void _onInterrupt(void); |
kandangath | 7:2d73e219dadf | 52 | void _callback(void); |
kandangath | 0:ca5a0fee9f52 | 53 | public: |
kandangath | 10:cb16d2957f8d | 54 | DebouncedInterrupt(PinName pin); |
kandangath | 10:cb16d2957f8d | 55 | ~DebouncedInterrupt(); |
kandangath | 10:cb16d2957f8d | 56 | |
kandangath | 10:cb16d2957f8d | 57 | // Start monitoring the interupt and attach a callback |
kandangath | 18:e6e9bc6402b7 | 58 | void attach(void (*fptr)(void), const gpio_irq_event trigger, const uint32_t& debounce_ms=10); |
kandangath | 21:34b95e1b2bf3 | 59 | |
kandangath | 21:34b95e1b2bf3 | 60 | template<typename T> |
kandangath | 22:9733f886810a | 61 | void attach(T* tptr, void (T::*mptr)(void), const gpio_irq_event trigger, const uint32_t& debounce_ms=10) { |
kandangath | 22:9733f886810a | 62 | _fAttach.attach(tptr, mptr); |
kandangath | 22:9733f886810a | 63 | _last_bounce_count = _bounce_count = 0; |
kandangath | 22:9733f886810a | 64 | _debounce_us = 1000*debounce_ms; |
kandangath | 22:9733f886810a | 65 | _trigger = trigger; |
kandangath | 22:9733f886810a | 66 | |
kandangath | 22:9733f886810a | 67 | switch(trigger) |
kandangath | 22:9733f886810a | 68 | { |
kandangath | 22:9733f886810a | 69 | case IRQ_RISE: |
kandangath | 22:9733f886810a | 70 | _in->rise(tptr, &DebouncedInterrupt::_onInterrupt); |
kandangath | 22:9733f886810a | 71 | break; |
kandangath | 22:9733f886810a | 72 | case IRQ_FALL: |
kandangath | 22:9733f886810a | 73 | _in->fall(tptr, &DebouncedInterrupt::_onInterrupt); |
kandangath | 22:9733f886810a | 74 | break; |
kandangath | 22:9733f886810a | 75 | case IRQ_NONE: |
kandangath | 22:9733f886810a | 76 | reset(); // Unexpected. Clear callbacks. |
kandangath | 22:9733f886810a | 77 | break; |
kandangath | 22:9733f886810a | 78 | } |
kandangath | 22:9733f886810a | 79 | } |
kandangath | 10:cb16d2957f8d | 80 | |
kandangath | 10:cb16d2957f8d | 81 | // Stop monitoring the interrupt |
kandangath | 10:cb16d2957f8d | 82 | void reset(); |
kandangath | 10:cb16d2957f8d | 83 | |
kandangath | 10:cb16d2957f8d | 84 | |
kandangath | 7:2d73e219dadf | 85 | /* |
kandangath | 13:09b53a088a9c | 86 | * Get number of bounces |
kandangath | 13:09b53a088a9c | 87 | * @return: bounce count |
kandangath | 7:2d73e219dadf | 88 | */ |
kandangath | 13:09b53a088a9c | 89 | unsigned int get_bounce(); |
kandangath | 22:9733f886810a | 90 | protected: |
kandangath | 22:9733f886810a | 91 | // https://github.com/mbedmicro/mbed/blob/master/libraries/mbed/api/FunctionPointer.h |
kandangath | 22:9733f886810a | 92 | FunctionPointer _fAttach; |
kandangath | 0:ca5a0fee9f52 | 93 | }; |
kandangath | 0:ca5a0fee9f52 | 94 | #endif |