dpgeorge
commented
2 years ago Thanks for the contribution. This is a good feature to have.
I've actually implemented this feature (RGBW pixel support) in 8d3078846c0129c2a1db20bd115b1501b5c07cd8 and 652116dd094d241807b0e16b8b51847c5eb469fa which:
- retains backwards compatibility with the existing RGB API
- is compatible with micro:bit v2 (which already supports RGBW)
- is a bit more concise on code size (which needs to be minimised on this project)
This patch adds support for RGB-W WS2812 neopixel components.
NeoPixel constructor now takes 3 arguments (pin, num_leds, num_channels). num_channels is used to determine whether an extra white channel needs to be sent to the LED chip.
neopixelsend.s assembly also now takes num_channels as a parameter in R3 to use as "parallel - serial conversion mask" in R6 instead of hardcoding value.
Commenting was largely for my own benefit deciphering the micropython internal structure and so may be untidy/uncertain.