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64 lines
1.6 KiB
64 lines
1.6 KiB
#pragma once
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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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#define DEBO_CHANNELS 11
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#define DEBO_TICKS 20
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/* Internal deboucer entry */
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typedef struct
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{
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PORT_P reg; // pin ptr
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uint8_t mask;
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uint8_t count; // number of ticks this was in the new state
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bool invert;
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bool state;
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void (*handler)(uint8_t pin_n, bool state);
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} DeboSlot;
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extern DeboSlot debo_slots[DEBO_CHANNELS];
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/** Add a pin for debouncing (must be used with constant args) */
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#define debo_add(pin, reverse, hdlr) debo_add_do(&_pin(pin), _pn(pin), reverse, hdlr)
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/** Add a pin for debouncing (low level function) */
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uint8_t debo_add_do(PORT_P pin_reg_pointer, uint8_t bit, bool invert, void (*handler)(uint8_t, bool));
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/** Check debounced pins, should be called periodically. */
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void debo_tick(void);
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/** Get a value of debounced pin */
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#define debo_get_pin(i) (debo_slots[i].state ^ debo_slots[i].invert)
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