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feat(kscan): Improve matrix debouncing

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Switched the GPIO matrix driver to debouncing using a simple integrator
algorithm. Whenever a key is pressed, we now scan at a rate controlled
by debounce-scan-period-ms (default 1 ms) until all keys are released,
then return to either waiting for an interrupt or polling more slowly.

The timers for key press and release can now be controlled separately,
so debounce-period is deprecated in favor of debounce-press-ms and
debounce-release-ms. Global Kconfig options
ZMK_KSCAN_DEBOUNCE_PRESS_MS and ZMK_KSCAN_DEBOUNCE_RELEASE_MS are also
added to make these easier to set.

Added documentation for debouncing options.
This commit is contained in:
Joel Spadin 2021-07-31 01:23:33 -05:00 • committed by Pete Johanson
parent 5cc7c280a5
commit f946dc6893
8 changed files with 348 additions and 64 deletions
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18
app/drivers/kscan/Kconfig
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@ -14,6 +14,24 @@ config ZMK_KSCAN_MATRIX_POLLING
config ZMK_KSCAN_DIRECT_POLLING
bool "Poll for key event triggers instead of using interrupts on direct wired boards."
config ZMK_KSCAN_DEBOUNCE_PRESS_MS
int "Debounce time for key press in milliseconds."
default -1
help
Global debounce time for key press in milliseconds.
If this is -1, the debounce time is controlled by the debounce-press-ms
Devicetree property, which defaults to 5 ms. Otherwise this overrides the
debounce time for all key scan drivers to the chosen value.
config ZMK_KSCAN_DEBOUNCE_RELEASE_MS
int "Debounce time for key release in milliseconds."
default -1
help
Global debounce time for key release in milliseconds.
If this is -1, the debounce time is controlled by the debounce-release-ms
Devicetree property, which defaults to 5 ms. Otherwise this overrides the
debounce time for all key scan drivers to the chosen value.
endif
config ZMK_KSCAN_INIT_PRIORITY