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65 lines
1.7 KiB
65 lines
1.7 KiB
10 years ago
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#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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// Example:
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// #pragma once
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// #define DEBO_CHANNELS 2
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// #define DDEBO_TICKS 5
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//
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// ----
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//
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// A pin is registered like this:
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//
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// #define BTN1 B,0
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// #define BTN2 B,1
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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 "calc.h"
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#include "pins.h"
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#include "debo_config.h"
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/* Internal deboucer entry */
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typedef struct {
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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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} debo_slot_t;
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debo_slot_t debo_slots[DEBO_CHANNELS];
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/** Add a pin for debouncing */
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#define debo_add_rev(io) debo_register(&io2pin(io_pack(io)), io2n(io_pack(io)), 1)
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#define debo_add(io) debo_register(&io2pin(io_pack(io)), io2n(io_pack(io)), 0)
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/** Add a pin for debouncing (low level function) */
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uint8_t debo_register(PORT_P pin_reg_pointer, uint8_t bit, bool invert);
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/** Check debounced pins, should be called periodically. */
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void debo_tick();
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/** Get a value of debounced pin */
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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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