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85 lines
2.3 KiB
85 lines
2.3 KiB
8 years ago
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#ifndef DEBOUNCE_H
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#define DEBOUNCE_H
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//
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// An implementation of button debouncer.
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//
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// ----
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//
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// You must provide a config file debo_config.h (next to your main.c)
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//
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// A pin is registered like this:
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//
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// #define BTN1 12 // pin D12
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// #define BTN2 13
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//
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// debo_add(BTN0); // The function returns number assigned to the pin (0, 1, ...)
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// debo_add_rev(BTN1); // active low
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// debo_register(&PINB, PB2, 0); // direct access - register, pin & invert
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//
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// Then periodically call the tick function (perhaps in a timer interrupt):
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//
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// debo_tick();
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//
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// To check if input is active, use
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//
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// debo_get_pin(0); // state of input #0 (registered first)
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// debo_get_pin(1); // state of input #1 (registered second)
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//
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#include <avr/io.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include "calc.h"
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#include "iopins.h"
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// Update as needed
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#define DEBO_CHANNELS 5
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#define DEBO_TICKS 50 // ms
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/** Debouncer callback; state - state after applying inverse bit */
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typedef void(*DebouncerCallback)(uint8_t n, bool state);
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/* Internal debouncer entry */
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typedef struct
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{
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PORT_P reg; // pointer to IO register
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uint8_t bit; // bits 6 and 7 of this hold "state" & "invert" flag
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uint8_t count; // number of ticks this was in the new state
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DebouncerCallback callback;
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} debo_slot_t;
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debo_slot_t debo_slots[DEBO_CHANNELS];
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/**
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* Add a pin for debouncing (low level function)
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*
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* @param pin_reg_pointer - PINx pointer
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* @param bit - number of the debounced bit in the register (0-7)
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* @param invert - invert the value when reading (for buttons to GND, for example)
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*/
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uint8_t debo_register(PORT_P pin_reg_pointer, uint8_t bit, bool invert, DebouncerCallback cbk);
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/**
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* Add a pin for debouncing (must be used with constant args).
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* Returns index in debouncer, used for callbacks.
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*
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* Arg: pin number, defined in iopins.h
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*/
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#define debo_add(pin, callback) debo_register(&_pin(pin), _pn(pin), false, callback)
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#define debo_add_rev(pin, callback) debo_register(&_pin(pin), _pn(pin), true, callback)
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/**
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* Check debounced pins, should be called periodically.
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* Updates internal states and fires callbacks.
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*/
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void debo_tick(void);
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/**
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* Get a value of debounced pin (after debounce - latched state)
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*/
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#define debo_get_pin(i) (get_bit(debo_slots[i].bit, 6) ^ get_bit(debo_slots[i].bit, 7))
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#endif
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