diff options
Diffstat (limited to 'quantum/wpm.c')
| -rw-r--r-- | quantum/wpm.c | 98 |
1 files changed, 77 insertions, 21 deletions
diff --git a/quantum/wpm.c b/quantum/wpm.c index cad4cefd5d..925e2c416e 100644 --- a/quantum/wpm.c +++ b/quantum/wpm.c @@ -21,13 +21,37 @@ // WPM Stuff static uint8_t current_wpm = 0; -static uint16_t wpm_timer = 0; +static uint32_t wpm_timer = 0; +#ifndef WPM_UNFILTERED +static uint32_t smoothing_timer = 0; +#endif -// This smoothing is 40 keystrokes -static const float wpm_smoothing = WPM_SMOOTHING; +/* The WPM calculation works by specifying a certain number of 'periods' inside + * a ring buffer, and we count the number of keypresses which occur in each of + * those periods. Then to calculate WPM, we add up all of the keypresses in + * the whole ring buffer, divide by the number of keypresses in a 'word', and + * then adjust for how much time is captured by our ring buffer. Right now + * the ring buffer is hardcoded below to be six half-second periods, accounting + * for a total WPM sampling period of up to three seconds of typing. + * + * Whenever our WPM drops to absolute zero due to no typing occurring within + * any contiguous three seconds, we reset and start measuring fresh, + * which lets our WPM immediately reach the correct value even before a full + * three second sampling buffer has been filled. + */ +#define MAX_PERIODS (WPM_SAMPLE_PERIODS) +#define PERIOD_DURATION (1000 * WPM_SAMPLE_SECONDS / MAX_PERIODS) +#define LATENCY (100) +static int8_t period_presses[MAX_PERIODS] = {0}; +static uint8_t current_period = 0; +static uint8_t periods = 1; -void set_current_wpm(uint8_t new_wpm) { current_wpm = new_wpm; } +#if !defined(WPM_UNFILTERED) +static uint8_t prev_wpm = 0; +static uint8_t next_wpm = 0; +#endif +void set_current_wpm(uint8_t new_wpm) { current_wpm = new_wpm; } uint8_t get_current_wpm(void) { return current_wpm; } bool wpm_keycode(uint16_t keycode) { return wpm_keycode_kb(keycode); } @@ -68,33 +92,65 @@ __attribute__((weak)) uint8_t wpm_regress_count(uint16_t keycode) { } #endif +// Outside 'raw' mode we smooth results over time. + void update_wpm(uint16_t keycode) { if (wpm_keycode(keycode)) { - if (wpm_timer > 0) { - uint16_t latest_wpm = 60000 / timer_elapsed(wpm_timer) / WPM_ESTIMATED_WORD_SIZE; - if (latest_wpm > UINT8_MAX) { - latest_wpm = UINT8_MAX; - } - current_wpm += ceilf((latest_wpm - current_wpm) * wpm_smoothing); - } - wpm_timer = timer_read(); + period_presses[current_period]++; } #ifdef WPM_ALLOW_COUNT_REGRESSION uint8_t regress = wpm_regress_count(keycode); if (regress) { - if (current_wpm < regress) { - current_wpm = 0; - } else { - current_wpm -= regress; - } - wpm_timer = timer_read(); + period_presses[current_period]--; } #endif } void decay_wpm(void) { - if (timer_elapsed(wpm_timer) > 1000) { - current_wpm += (-current_wpm) * wpm_smoothing; - wpm_timer = timer_read(); + int32_t presses = period_presses[0]; + for (int i = 1; i <= periods; i++) { + presses += period_presses[i]; + } + if (presses < 0) { + presses = 0; } + int32_t elapsed = timer_elapsed32(wpm_timer); + uint32_t duration = (((periods)*PERIOD_DURATION) + elapsed); + uint32_t wpm_now = (60000 * presses) / (duration * WPM_ESTIMATED_WORD_SIZE); + wpm_now = (wpm_now > 240) ? 240 : wpm_now; + + if (elapsed > PERIOD_DURATION) { + current_period = (current_period + 1) % MAX_PERIODS; + period_presses[current_period] = 0; + periods = (periods < MAX_PERIODS - 1) ? periods + 1 : MAX_PERIODS - 1; + elapsed = 0; + /* if (wpm_timer == 0) { */ + wpm_timer = timer_read32(); + /* } else { */ + /* wpm_timer += PERIOD_DURATION; */ + /* } */ + } + if (presses < 2) // don't guess high WPM based on a single keypress. + wpm_now = 0; + +#if defined WPM_LAUNCH_CONTROL + if (presses == 0) { + current_period = 0; + periods = 0; + wpm_now = 0; + } +#endif // WPM_LAUNCH_CONTROL + +#ifndef WPM_UNFILTERED + int32_t latency = timer_elapsed32(smoothing_timer); + if (latency > LATENCY) { + smoothing_timer = timer_read32(); + prev_wpm = current_wpm; + next_wpm = wpm_now; + } + + current_wpm = prev_wpm + (latency * ((int)next_wpm - (int)prev_wpm) / LATENCY); +#else + current_wpm = wpm_now; +#endif } |