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