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feat(kscan): Kconfig for optional scan delay.

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Add optional Kconfig setting to delay scanning after each
output column is set, and inputs are read, to allow inputs
to "settle" after the last column is set back to inactive.
This commit is contained in:
Peter Johanson 2022-04-19 03:02:00 -04:00 committed by Pete Johanson
parent b1ce8a0d33
commit 08c43feaaf
2 changed files with 18 additions and 0 deletions
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14
app/drivers/kscan/Kconfig
View file

@ -30,6 +30,20 @@ config ZMK_KSCAN_GPIO_MATRIX
default $(dt_compat_enabled,$(DT_COMPAT_ZMK_KSCAN_GPIO_MATRIX))
select ZMK_KSCAN_GPIO_DRIVER
if ZMK_KSCAN_GPIO_MATRIX
config ZMK_KSCAN_MATRIX_WAIT_BETWEEN_OUTPUTS
int "Ticks to wait between each output when scanning"
default 0
help
When iterating over each output to drive it active, read inputs, then set
inactive again, some boards may take time for the previous output to
"settle" before reading inputs for the next active output column. In that
scenario, set this value to a positive value to configure the number of
usecs to wait after reading each column of keys.
endif # ZMK_KSCAN_GPIO_MATRIX
config ZMK_KSCAN_MOCK_DRIVER
bool
default $(dt_compat_enabled,$(DT_COMPAT_ZMK_KSCAN_MOCK))

4
app/drivers/kscan/kscan_gpio_matrix.c
View file

@ -250,6 +250,10 @@ static int kscan_matrix_read(const struct device *dev) {
LOG_ERR("Failed to set output %i inactive: %i", o, err);
return err;
}
#if CONFIG_ZMK_KSCAN_MATRIX_WAIT_BETWEEN_OUTPUTS > 0
k_busy_wait(CONFIG_ZMK_KSCAN_MATRIX_WAIT_BETWEEN_OUTPUTS);
#endif
}
// Process the new state.