DotStar FeatherWing

• https://learn.adafruit.com/adafruit-dotstar-featherwing-adafruit
• APA102 datasheet https://cdn-learn.adafruit.com/assets/assets/000/084/591/original/APA102_LED.pdf?1574117503

• DIN D11 -> MOSI
• CIN D13 -> SCK
• SPI Mode3 CPOL1 and CPH1 (STM: SPI_POLARITY_HIGH, SPI_PHASE_2EDGE)

• MSB first, no Chip Select
• Start Frame 4 Bytes 0x00000000
• n LED Frames 4 Bytes
  • 1st Byte global Brightness 5 bits, 3 higher bit are 1
  • 2nd Blue
  • 3th Green
  • 4th Red
• End Frame 4 Bytes 0xFFFFFFFF

-- Peter Schmid - 2021-05-04

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