Messages in this thread | | | From | Chuanhong Guo <> | Date | Wed, 30 Nov 2022 16:38:39 +0800 | Subject | Re: [PATCH 2/3] dt-bindings: leds: add dt schema for worldsemi,ws2812b-spi |
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Hi!
On Wed, Nov 30, 2022 at 4:33 PM Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> wrote: > >> What controls the intensity? Don't you have PWM there? > > > > WS2812 is a RGB led, which contains a small Microcontroller. The µC > > takes 24 byte intensity data from a serial input and then passes on > > any following bits to the next LED. SPI clk and chip-select are > > ignored (chip-select support can be trivially added though). > > > > You can find them everywhere nowadays, since they are quite cheap > > (a few cents per LED) and need only one MOSI pin to control hundreds > > of LEDs. > > OK. This should be anyway existing property, so default-brightness.
default-intensity is a different property. Intensity controls only the color for a multicolor led. The final brightness is calculated with this intensity value with the single brightness value of the current LED. (See my previous mail.)
-- Regards, Chuanhong Guo
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