[GitHub] [incubator-nuttx] btashton opened a new pull request #1797: LED: Support for WS2812 led controller (aka Adafruit NeoPixel)

[GitBox]

btashton opened a new pull request #1797:
URL: https://github.com/apache/incubator-nuttx/pull/1797


   ## Summary
   The WS2812 is very common in LED strips as it is an integrated controller 
and LED. It is driven by a single data line, but the timing requirements can be 
met by using most SPI controllers and the use of DMA.
   
   https://cdn-shop.adafruit.com/datasheets/WS2812.pdf
   
   ## Impact
   Added support for WS2812 based LED light strips.
   
   ## Testing
   This driver has been validated on the nRF52 arch both with a single LED and 
a strip of 144.
   The timing requirements have also been validated for using a 8MHz and 4MHz 
SPI clock.
   
   Here is a video of a "jumping" demo that using the seek and write 
interfaces. https://giphy.com/gifs/TjGKy7TT7jwj88bh5x
   
   
![image](https://user-images.githubusercontent.com/173245/93258951-f0a65400-f753-11ea-9137-06ac83e04bce.png)
   
   


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