You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
67 lines
1.7 KiB
67 lines
1.7 KiB
2 years ago
|
#pragma once
|
||
|
|
|
||
|
|
//
|
||
|
|
// An implementation of button debouncer.
|
||
|
|
//
|
||
|
|
// ----
|
||
|
|
//
|
||
|
|
// You must provide a config file debo_config.h (next to your main.c)
|
||
|
|
//
|
||
|
|
// A pin is registered like this:
|
||
|
|
//
|
||
|
|
// #define BTN1 12 // pin D12
|
||
|
|
// #define BTN2 13
|
||
|
|
//
|
||
|
|
// debo_add(BTN0); // The function returns number assigned to the pin (0, 1, ...)
|
||
|
|
// debo_add_rev(BTN1); // active low
|
||
|
|
// debo_register(&PINB, PB2, 0); // direct access - register, pin & invert
|
||
|
|
//
|
||
|
|
// Then periodically call the tick function (perhaps in a timer interrupt):
|
||
|
|
//
|
||
|
|
// debo_tick();
|
||
|
|
//
|
||
|
|
// To check if input is active, use
|
||
|
|
//
|
||
|
|
// debo_get_pin(0); // state of input #0 (registered first)
|
||
|
|
// debo_get_pin(1); // state of input #1 (registered second)
|
||
|
|
//
|
||
|
|
|
||
|
|
|
||
|
|
#include <avr/io.h>
|
||
|
|
#include <stdbool.h>
|
||
|
|
#include <stdint.h>
|
||
|
|
|
||
|
|
#include "calc.h"
|
||
|
|
#include "iopins.h"
|
||
|
|
|
||
|
|
// Your config file
|
||
|
|
#include "debo_config.h"
|
||
|
|
/*
|
||
|
|
#define DEBO_CHANNELS 2
|
||
|
|
#define DDEBO_TICKS 5
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
/* Internal deboucer entry */
|
||
|
|
typedef struct
|
||
|
|
{
|
||
|
|
PORT_P reg; // pointer to IO register
|
||
|
|
uint8_t bit; // bits 6 and 7 of this hold "state" & "invert" flag
|
||
|
|
uint8_t count; // number of ticks this was in the new state
|
||
|
|
} debo_slot_t;
|
||
|
|
|
||
|
|
debo_slot_t debo_slots[DEBO_CHANNELS];
|
||
|
|
|
||
|
|
/** Add a pin for debouncing (must be used with constant args) */
|
||
|
|
#define debo_add_rev(pin) debo_register(&_pin(pin), _pn(pin), 1)
|
||
|
|
#define debo_add(pin) debo_register(&_pin(pin), _pn(pin), 0)
|
||
|
|
|
||
|
|
/** Add a pin for debouncing (low level function) */
|
||
|
|
uint8_t debo_register(PORT_P pin_reg_pointer, uint8_t bit, bool invert);
|
||
|
|
|
||
|
|
/** Check debounced pins, should be called periodically. */
|
||
|
|
void debo_tick();
|
||
|
|
|
||
|
|
/** Get a value of debounced pin */
|
||
|
|
#define debo_get_pin(i) (get_bit(debo_slots[i].bit, 6) ^ get_bit(debo_slots[i].bit, 7))
|