Anil Kandangath / DebouncedInterrupt Featured

Debounce InterruptIn

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DebouncedInterrupt.h@18:e6e9bc6402b7, 2014-02-19 (annotated)

Committer:
kandangath
Date:
Wed Feb 19 01:47:45 2014 +0000
Revision:
18:e6e9bc6402b7
Parent:
17:96a51b236ba0
Child:
20:996ea2fc8d2d
Support checking rise and fall of signals

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kandangath 0:ca5a0fee9f52 1
kandangath 15:948e85b22efe 2 /** A replacement for InterruptIn that debounces the interrupt
kandangath 15:948e85b22efe 3 * Anil Kandangath
kandangath 15:948e85b22efe 4 *
kandangath 15:948e85b22efe 5 * @code
kandangath 15:948e85b22efe 6 *
kandangath 15:948e85b22efe 7 * #include "DebouncedInterrupt.h"
kandangath 15:948e85b22efe 8 *
kandangath 15:948e85b22efe 9 * DebouncedInterrupt up_button(p15);
kandangath 15:948e85b22efe 10 *
kandangath 15:948e85b22efe 11 * void onUp()
kandangath 15:948e85b22efe 12 * {
kandangath 15:948e85b22efe 13 * // Do Something
kandangath 15:948e85b22efe 14 * }
kandangath 15:948e85b22efe 15 *
kandangath 15:948e85b22efe 16 * int main()
kandangath 15:948e85b22efe 17 * {
kandangath 18:e6e9bc6402b7 18 * up_button.attach(&onUp,IRQ_FALL, 100);
kandangath 15:948e85b22efe 19 * while(1) {
kandangath 15:948e85b22efe 20 * ...
kandangath 15:948e85b22efe 21 * }
kandangath 15:948e85b22efe 22 * }
kandangath 15:948e85b22efe 23 * @endcode
kandangath 15:948e85b22efe 24 */
kandangath 0:ca5a0fee9f52 25
kandangath 10:cb16d2957f8d 26 #ifndef DEBOUNCED_INTERRUPT_H
kandangath 10:cb16d2957f8d 27 #define DEBOUNCED_INTERRUPT_H
kandangath 0:ca5a0fee9f52 28
kandangath 0:ca5a0fee9f52 29 #include <stdint.h>
kandangath 0:ca5a0fee9f52 30 #include "mbed.h"
kandangath 0:ca5a0fee9f52 31
kandangath 18:e6e9bc6402b7 32 /**
kandangath 18:e6e9bc6402b7 33 typedef enum {
kandangath 18:e6e9bc6402b7 34 IRQ_NONE,
kandangath 18:e6e9bc6402b7 35 IRQ_RISE,
kandangath 18:e6e9bc6402b7 36 IRQ_FALL
kandangath 18:e6e9bc6402b7 37 } gpio_irq_event;
kandangath 18:e6e9bc6402b7 38 **/
kandangath 18:e6e9bc6402b7 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 0:ca5a0fee9f52 51 void (*fCallback)(void);
kandangath 3:e4b7033508d1 52 void _onInterrupt(void);
kandangath 7:2d73e219dadf 53 void _callback(void);
kandangath 0:ca5a0fee9f52 54 public:
kandangath 10:cb16d2957f8d 55 DebouncedInterrupt(PinName pin);
kandangath 10:cb16d2957f8d 56 ~DebouncedInterrupt();
kandangath 10:cb16d2957f8d 57
kandangath 10:cb16d2957f8d 58 // Start monitoring the interupt and attach a callback
kandangath 18:e6e9bc6402b7 59 void attach(void (*fptr)(void), const gpio_irq_event trigger, const uint32_t& debounce_ms=10);
kandangath 10:cb16d2957f8d 60
kandangath 10:cb16d2957f8d 61 // Stop monitoring the interrupt
kandangath 10:cb16d2957f8d 62 void reset();
kandangath 10:cb16d2957f8d 63
kandangath 10:cb16d2957f8d 64
kandangath 7:2d73e219dadf 65 /*
kandangath 13:09b53a088a9c 66 * Get number of bounces
kandangath 13:09b53a088a9c 67 * @return: bounce count
kandangath 7:2d73e219dadf 68 */
kandangath 13:09b53a088a9c 69 unsigned int get_bounce();
kandangath 0:ca5a0fee9f52 70 };
kandangath 0:ca5a0fee9f52 71 #endif