Fixes potential wpm sampling overflow, along with code comment fixes (#15277)
Co-authored-by: Trevor Powell <trevor@vectorstorm.com.au>
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vectorstorm
GitHub
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3 changed files with 45 additions and 34 deletions
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@ -16,7 +16,7 @@ For split keyboards using soft serial, the computed WPM score will be available
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| `WPM_ALLOW_COUNT_REGRESSION` | _Not defined_ | If defined allows the WPM to be decreased when hitting Delete or Backspace |
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| `WPM_UNFILTERED` | _Not defined_ | If undefined (the default), WPM values will be smoothed to avoid sudden changes in value |
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| `WPM_SAMPLE_SECONDS` | `5` | This defines how many seconds of typing to average, when calculating WPM |
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| `WPM_SAMPLE_PERIODS` | `50` | This defines how many sampling periods to use when calculating WPM |
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| `WPM_SAMPLE_PERIODS` | `25` | This defines how many sampling periods to use when calculating WPM |
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| `WPM_LAUNCH_CONTROL` | _Not defined_ | If defined, WPM values will be calculated using partial buffers when typing begins |
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'WPM_UNFILTERED' is potentially useful if you're filtering data in some other way (and also because it reduces the code required for the WPM feature), or if reducing measurement latency to a minimum is important for you.
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@ -22,33 +22,37 @@
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// WPM Stuff
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static uint8_t current_wpm = 0;
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static uint32_t wpm_timer = 0;
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#ifndef WPM_UNFILTERED
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static uint32_t smoothing_timer = 0;
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#endif
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/* The WPM calculation works by specifying a certain number of 'periods' inside
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* a ring buffer, and we count the number of keypresses which occur in each of
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* those periods. Then to calculate WPM, we add up all of the keypresses in
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* the whole ring buffer, divide by the number of keypresses in a 'word', and
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* then adjust for how much time is captured by our ring buffer. Right now
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* the ring buffer is hardcoded below to be six half-second periods, accounting
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* for a total WPM sampling period of up to three seconds of typing.
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* then adjust for how much time is captured by our ring buffer. The size
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* of the ring buffer can be configured using the keymap configuration
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* value `WPM_SAMPLE_PERIODS`.
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*
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* Whenever our WPM drops to absolute zero due to no typing occurring within
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* any contiguous three seconds, we reset and start measuring fresh,
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* which lets our WPM immediately reach the correct value even before a full
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* three second sampling buffer has been filled.
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*/
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#define MAX_PERIODS (WPM_SAMPLE_PERIODS)
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#define PERIOD_DURATION (1000 * WPM_SAMPLE_SECONDS / MAX_PERIODS)
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#define LATENCY (100)
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static int8_t period_presses[MAX_PERIODS] = {0};
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static int16_t period_presses[MAX_PERIODS] = {0};
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static uint8_t current_period = 0;
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static uint8_t periods = 1;
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#if !defined(WPM_UNFILTERED)
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static uint8_t prev_wpm = 0;
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static uint8_t next_wpm = 0;
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/* LATENCY is used as part of filtering, and controls how quickly the reported
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* WPM trails behind our actual instantaneous measured WPM value, and is
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* defined in milliseconds. So for LATENCY == 100, the displayed WPM is
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* smoothed out over periods of 0.1 seconds. This results in a nice,
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* smoothly-moving reported WPM value which nevertheless is never more than
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* 0.1 seconds behind the typist's actual current WPM.
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*
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* LATENCY is not used if WPM_UNFILTERED is defined.
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*/
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# define LATENCY (100)
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static uint32_t smoothing_timer = 0;
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static uint8_t prev_wpm = 0;
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static uint8_t next_wpm = 0;
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#endif
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void set_current_wpm(uint8_t new_wpm) { current_wpm = new_wpm; }
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@ -71,7 +75,7 @@ __attribute__((weak)) bool wpm_keycode_user(uint16_t keycode) {
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return false;
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}
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#ifdef WPM_ALLOW_COUNT_REGRESSION
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#if defined(WPM_ALLOW_COUNT_REGRESSION)
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__attribute__((weak)) uint8_t wpm_regress_count(uint16_t keycode) {
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bool weak_modded = (keycode >= QK_LCTL && keycode < QK_LSFT) || (keycode >= QK_RCTL && keycode < QK_RSFT);
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@ -95,12 +99,12 @@ __attribute__((weak)) uint8_t wpm_regress_count(uint16_t keycode) {
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// Outside 'raw' mode we smooth results over time.
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void update_wpm(uint16_t keycode) {
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if (wpm_keycode(keycode)) {
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if (wpm_keycode(keycode) && period_presses[current_period] < INT16_MAX) {
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period_presses[current_period]++;
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}
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#ifdef WPM_ALLOW_COUNT_REGRESSION
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#if defined(WPM_ALLOW_COUNT_REGRESSION)
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uint8_t regress = wpm_regress_count(keycode);
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if (regress) {
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if (regress && period_presses[current_period] > INT16_MIN) {
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period_presses[current_period]--;
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}
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#endif
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@ -116,32 +120,41 @@ void decay_wpm(void) {
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}
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int32_t elapsed = timer_elapsed32(wpm_timer);
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uint32_t duration = (((periods)*PERIOD_DURATION) + elapsed);
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uint32_t wpm_now = (60000 * presses) / (duration * WPM_ESTIMATED_WORD_SIZE);
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wpm_now = (wpm_now > 240) ? 240 : wpm_now;
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int32_t wpm_now = (60000 * presses) / (duration * WPM_ESTIMATED_WORD_SIZE);
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if (wpm_now < 0) // set some reasonable WPM measurement limits
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wpm_now = 0;
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if (wpm_now > 240) wpm_now = 240;
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if (elapsed > PERIOD_DURATION) {
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current_period = (current_period + 1) % MAX_PERIODS;
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period_presses[current_period] = 0;
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periods = (periods < MAX_PERIODS - 1) ? periods + 1 : MAX_PERIODS - 1;
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elapsed = 0;
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/* if (wpm_timer == 0) { */
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wpm_timer = timer_read32();
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/* } else { */
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/* wpm_timer += PERIOD_DURATION; */
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/* } */
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wpm_timer = timer_read32();
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}
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if (presses < 2) // don't guess high WPM based on a single keypress.
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wpm_now = 0;
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#if defined WPM_LAUNCH_CONTROL
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#if defined(WPM_LAUNCH_CONTROL)
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/*
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* If the `WPM_LAUNCH_CONTROL` option is enabled, then whenever our WPM
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* drops to absolute zero due to no typing occurring within our sample
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* ring buffer, we reset and start measuring fresh, which lets our WPM
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* immediately reach the correct value even before a full sampling buffer
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* has been filled.
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*/
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if (presses == 0) {
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current_period = 0;
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periods = 0;
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wpm_now = 0;
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current_period = 0;
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periods = 0;
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wpm_now = 0;
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period_presses[0] = 0;
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}
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#endif // WPM_LAUNCH_CONTROL
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#ifndef WPM_UNFILTERED
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#if defined(WPM_UNFILTERED)
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current_wpm = wpm_now;
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#else
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int32_t latency = timer_elapsed32(smoothing_timer);
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if (latency > LATENCY) {
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smoothing_timer = timer_read32();
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@ -150,7 +163,5 @@ void decay_wpm(void) {
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}
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current_wpm = prev_wpm + (latency * ((int)next_wpm - (int)prev_wpm) / LATENCY);
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#else
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current_wpm = wpm_now;
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#endif
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}
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@ -26,7 +26,7 @@
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# define WPM_SAMPLE_SECONDS 5
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#endif
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#ifndef WPM_SAMPLE_PERIODS
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# define WPM_SAMPLE_PERIODS 50
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# define WPM_SAMPLE_PERIODS 25
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#endif
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bool wpm_keycode(uint16_t keycode);
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