commit dd887eae360098cd13939d252c772bb95735e0e9
parent 911c715f49f757eae6490d3d0426ee4ccf30ea2a
Author: Daniel Schaefer <dhs@frame.work>
Date: Sun, 3 Sep 2023 20:56:02 +0800
[Core] Allow customizing PWM frequency (#21717)
* [Core] Allow customizing PWM frequency
Some frequencies can cause audible noise. Changing the frequency
eliminates that.
Signed-off-by: Daniel Schaefer <dhs@frame.work>
* docs/feature-backlight: Mention PWM frequency
Signed-off-by: Daniel Schaefer <dhs@frame.work>
---------
Signed-off-by: Daniel Schaefer <dhs@frame.work>
Diffstat:
2 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/docs/feature_backlight.md b/docs/feature_backlight.md
@@ -39,6 +39,7 @@ Add the following to your `config.h`:
|`BACKLIGHT_LIMIT_VAL` |`255` |The maximum duty cycle of the backlight -- `255` allows for full brightness, any lower will decrease the maximum.|
|`BACKLIGHT_DEFAULT_LEVEL` |`BACKLIGHT_LEVELS`|The default backlight level to use upon clearing the EEPROM |
|`BACKLIGHT_DEFAULT_BREATHING`|*Not defined* |Whether to enable backlight breathing upon clearing the EEPROM |
+|`BACKLIGHT_PWM_PERIOD` |2048Hz |Defaults to `BACKLIGHT_PWM_COUNTER_FREQUENCY / 2048`, which results in a PWM frequency of 2048Hz. |
Unless you are designing your own keyboard, you generally should not need to change the `BACKLIGHT_PIN` or `BACKLIGHT_ON_STATE`.
diff --git a/platforms/chibios/chibios_config.h b/platforms/chibios/chibios_config.h
@@ -37,7 +37,9 @@
# define BACKLIGHT_PAL_MODE (PAL_MODE_ALTERNATE_PWM | PAL_RP_PAD_DRIVE12 | PAL_RP_GPIO_OE)
# endif
# define BACKLIGHT_PWM_COUNTER_FREQUENCY 1000000
-# define BACKLIGHT_PWM_PERIOD BACKLIGHT_PWM_COUNTER_FREQUENCY / 2048
+# ifndef BACKLIGHT_PWM_PERIOD
+# define BACKLIGHT_PWM_PERIOD BACKLIGHT_PWM_COUNTER_FREQUENCY / 2048
+# endif
# ifndef AUDIO_PWM_PAL_MODE
# define AUDIO_PWM_PAL_MODE (PAL_MODE_ALTERNATE_PWM | PAL_RP_PAD_DRIVE12 | PAL_RP_GPIO_OE)
