The WS2811 LED bit timing tolerance should be wider

[Marcus10110]

Existing tolerances can be found here:

async-rgb-led-analyzer/src/AsyncRgbLedAnalyzerSettings.cpp

Line 64 in c93bccd

"WS2811", "Worldsemi 24-bit RGB controller", 8, 3,

Taken from this datasheet:
https://cdn-shop.adafruit.com/datasheets/WS2811.pdf

Problem 1: The tolerance for the high speed operation is implemented as +/- 75ns. The datasheet is ambiguous, and I suggest increasing tolerance to +/-150ns.

Problem 2: Other datasheets for the WS2811 offer wildly different ranges:
e.g. this document (via google):
http://www.world-semi.com/DownLoadFile/129

I can't update this at the moment, and to complicate things, the tests for this analyzer haven't been migrated in yet from the original repo here:
https://github.com/saleae/AsyncRgbLedAnalyzer/tree/topics/testing

And I think updating these tolerances might break tests.

[timreyes]

Another request for looser timing requirements here:
https://discuss.saleae.com/t/ws2812b-analyzer/2133/2

[timreyes]

https://discuss.saleae.com/t/ws2812b-analyzer/2133/6
"Info on the real timing constraints on these WS2812Bs (data sheet is not even coherent)…
NeoPixels are not that hard"

[magicsmoke]

Is there a laymans way to fix this myself? Working on debugging WS2812B LEDs and it really is a shame i have to take my 10usd knock off logic analyser to use instead of my Logic 8. Spent quite a bit before realising this was an issue.