Support for RGBW (SK6812RGBW,etc...)

[emilagervigstarup]

Is it possible to add RGBW support? (:

Like this one:
https://www.adafruit.com/product/2842?length=4

[uraimo]

That strip uses SK6812RGBW leds that have timings similar to the original WS2812.
See the data sheet here: https://cdn-shop.adafruit.com/product-files/2757/p2757_SK6812RGBW_REV01.pdf

While the only important thing to change in the timings is the longer reset time (80us), you'll also have to accomodate 8 additional bits for the intensity of the white led (so, you'll be sending 40bits for each led instead of the current 32).
I'd say it's doable if you have a strip to test it, the datatypes will need to be changed a bit to accomodate both 32 & 40 bits blocks cleanly.