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/*
* Copyright 2022 Paul Ewing
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "key_repeater.h"
#include <stdlib.h>
#include QMK_KEYBOARD_H
enum key_repeater_state {
KR_DISABLED,
KR_WAITING,
KR_BUTTON_DOWN,
__KR_STATE_COUNT
};
struct key_repeater_t {
int key;
uint32_t key_duration_min;
uint32_t key_duration_max;
uint32_t wait_duration_min;
uint32_t wait_duration_max;
enum key_repeater_state state;
uint32_t previous_button_down;
uint32_t previous_button_up;
uint32_t key_duration;
uint32_t wait_duration;
};
// Utility functions
uint32_t get_rand(uint32_t min, uint32_t max);
// State handler function table
void kr_waiting(struct key_repeater_t *kr);
void kr_button_down(struct key_repeater_t *kr);
typedef void (*kr_state_handler)(struct key_repeater_t *kr);
static kr_state_handler kr_state_handlers[] = {
[KR_DISABLED] = NULL,
[KR_WAITING] = kr_waiting,
[KR_BUTTON_DOWN] = kr_button_down,
};
struct key_repeater_t* kr_new(struct key_repeater_config_t* cfg) {
struct key_repeater_t* kr = (struct key_repeater_t*)malloc(sizeof(struct key_repeater_t));
if (cfg) {
kr->key = cfg->key;
kr->key_duration_min = cfg->key_duration_min;
kr->key_duration_max = cfg->key_duration_max;
kr->wait_duration_min = cfg->wait_duration_min;
kr->wait_duration_max = cfg->wait_duration_max;
} else {
kr->key = KC_NO;
kr->key_duration_min = 0;
kr->key_duration_max = 0;
kr->wait_duration_min = 0;
kr->wait_duration_max = 0;
}
kr->state = KR_DISABLED;
kr->previous_button_down = 0;
kr->previous_button_up = 0;
kr->key_duration = 0;
kr->wait_duration = 0;
return kr;
}
void kr_free(struct key_repeater_t **kr) {
if (kr && *kr) {
free(*kr);
*kr = NULL;
}
}
void kr_enable(struct key_repeater_t *kr) {
if (!kr || kr->key == KC_NO) {
return;
}
if (kr->state != KR_DISABLED) {
return;
}
kr->state = KR_WAITING;
kr->previous_button_down = 0;
kr->previous_button_up = 0;
kr->key_duration = 0;
kr->wait_duration = 0;
}
void kr_disable(struct key_repeater_t *kr) {
if (!kr || kr->key == KC_NO) {
return;
}
if (kr->state == KR_BUTTON_DOWN) {
unregister_code(kr->key);
}
kr->state = KR_DISABLED;
}
void kr_poll(struct key_repeater_t *kr) {
if (!kr || kr->key == KC_NO) {
return;
}
kr_state_handler handler = kr_state_handlers[kr->state];
if (handler) {
(handler)(kr);
}
}
void kr_waiting(struct key_repeater_t *kr) {
if (!kr || kr->key == KC_NO) {
return;
}
uint32_t now = timer_read32();
if (now > (kr->previous_button_up + kr->wait_duration)) {
kr->state = KR_BUTTON_DOWN;
kr->previous_button_down = now;
if (kr->key_duration_min == kr->key_duration_max) {
kr->key_duration = kr->key_duration_min;
} else {
kr->key_duration = get_rand(kr->key_duration_min, kr->key_duration_max);
}
register_code(kr->key);
}
}
void kr_button_down(struct key_repeater_t *kr) {
if (!kr || kr->key == KC_NO) {
return;
}
uint32_t now = timer_read32();
if (now > (kr->previous_button_down + kr->key_duration)) {
kr->state = KR_WAITING;
kr->previous_button_up = now;
if (kr->wait_duration_min == kr->wait_duration_max) {
kr->wait_duration = kr->wait_duration_min;
} else {
kr->wait_duration = get_rand(kr->wait_duration_min, kr->wait_duration_max);
}
unregister_code(kr->key);
}
}
// Return a random number between min and max; assumes that the random number
// generator has already been seeded
uint32_t get_rand(uint32_t min, uint32_t max) {
return (rand() % (max - min)) + min;
}
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