I have the neopixelWrite working (most of the time)
Tests, about 2 weeks ago, ran with a 8 by 8 matrix, which is refreshed each 50 msecs with changing data. Handover of data works with an Uint8Array created by an Espruino Extension.
"Most of the time" because sometimes I see a flash with wrong colors. But next refresh everything is fine again.
Its tested with ESP8266-01 using D2.
AFAIK, D2 is used for logging as serial1. This is recognized by WS2812 after reset mostly. First LED is green, at least in my environment.
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