How To Use

Single Pixel

The Adafruit Feather STM32F405 Board has its own Neopixel (GPIO PC0, D8) :

neopixel!    ( rgb -- )  sets the neopixel RGB led ($ff0000 red, $00ff00 green, $0000ff blue)

On the STM32WB Feather Development Board the NeoPixel shares the LED D12 pin. It is easy to add an Adafruit pixel breakout board or a Flora Pixel at the top of the shield. The LED can be used concurrently.

• green: successfull USB enumeration
• blue: BLE connected
• flashing red: file write operation
• flashing yellow: file read operation

For the STM32WB Nucleo Board I use D6 for the Neopixel

3 6 dmod           \ D6 output
$ff0000 neopixel!   \ red LED 100 % brightness

Neopixel Wing with 32 Pixels

3 6 dmod                       \ D6 output
32 cells buffer: pixelbuffer    \ create buffer for the neopixels
$ff0000 pixelbuffer !            \ 1st Neopixel red
$00ff00 pixelbuffer 1 cells + !   \ 2nd Neopixel green
$0000ff pixelbuffer 2 cells + !    \ 3th Neopixel blue
$7f7f7f pixelbuffer 3 cells + !     \ 4th Neopixel white 50 %
pixelbuffer 4 neopixels

create pixels 
$010000 , $020000 , $040000 , $080000 , $100000 , $200000 , $400000 , $800000 , \ 1st row red
$008000 , $004000 , $002000 , $001000 , $000800 , $000400 , $000200 , $000100 , \ 2nd row green
$000001 , $000002 , $000004 , $000008 , $000010 , $000020 , $000040 , $000080 , \ 3th row blue
$808080 , $404040 , $202020 , $101010 , $080808 , $040404 , $020202 , $010101 , \ 4th row white
pixels 32 neopixels

Implementation