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/*
* Copyright (c) 2020 The ZMK Contributors
*
* SPDX-License-Identifier: MIT
*/
#include <zephyr/device.h>
#include <zephyr/init.h>
#include <zephyr/kernel.h>
#include <zephyr/logging/log.h>
LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
#include <zmk/event_manager.h>
#include <zmk/events/wpm_state_changed.h>
#include <zmk/events/keycode_state_changed.h>
#include <zmk/wpm.h>
#define WPM_UPDATE_INTERVAL_SECONDS 1
#define WPM_RESET_INTERVAL_SECONDS 5
// See https://en.wikipedia.org/wiki/Words_per_minute
// "Since the length or duration of words is clearly variable, for the purpose of measurement of
// text entry, the definition of each "word" is often standardized to be five characters or
// keystrokes long in English"
#define CHARS_PER_WORD 5.0
static uint8_t wpm_state = -1;
static uint8_t last_wpm_state;
static uint8_t wpm_update_counter;
static uint32_t key_pressed_count;
int zmk_wpm_get_state(void) { return wpm_state; }
int wpm_event_listener(const zmk_event_t *eh) {
const struct zmk_keycode_state_changed *ev = as_zmk_keycode_state_changed(eh);
if (ev) {
// count only key up events
if (!ev->state) {
key_pressed_count++;
LOG_DBG("key_pressed_count %d keycode %d", key_pressed_count, ev->keycode);
}
}
return 0;
}
void wpm_work_handler(struct k_work *work) {
wpm_update_counter++;
wpm_state = (key_pressed_count / CHARS_PER_WORD) /
(wpm_update_counter * WPM_UPDATE_INTERVAL_SECONDS / 60.0);
if (last_wpm_state != wpm_state) {
LOG_DBG("Raised WPM state changed %d wpm_update_counter %d", wpm_state, wpm_update_counter);
raise_zmk_wpm_state_changed((struct zmk_wpm_state_changed){.state = wpm_state});
last_wpm_state = wpm_state;
}
if (wpm_update_counter >= WPM_RESET_INTERVAL_SECONDS) {
wpm_update_counter = 0;
key_pressed_count = 0;
}
}
K_WORK_DEFINE(wpm_work, wpm_work_handler);
void wpm_expiry_function(struct k_timer *_timer) { k_work_submit(&wpm_work); }
K_TIMER_DEFINE(wpm_timer, wpm_expiry_function, NULL);
static int wpm_init(void) {
wpm_state = 0;
wpm_update_counter = 0;
k_timer_start(&wpm_timer, K_SECONDS(WPM_UPDATE_INTERVAL_SECONDS),
K_SECONDS(WPM_UPDATE_INTERVAL_SECONDS));
return 0;
}
ZMK_LISTENER(wpm, wpm_event_listener);
ZMK_SUBSCRIPTION(wpm, zmk_keycode_state_changed);
SYS_INIT(wpm_init, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY);
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