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[Core] Allow customizing PWM frequency (#21717)

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* [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>
This commit is contained in:
Daniel Schaefer 2023-09-03 20:56:02 +08:00 committed by GitHub
parent 911c715f49
commit dd887eae36
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2 changed files with 4 additions and 1 deletions
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1
docs/feature_backlight.md
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@ -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`.

2
platforms/chibios/chibios_config.h
View file

@ -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
# 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)