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@Scade WS2812B-Mini was not following own timing spec for reset pulse. Second problem was that reset pulse generation was badly written in library I reused so it was perfectly within spec but not possible to change it. But that was minor problem.
When there are only 2 pages on Google you know you're in serious shit.
Debugging is not about process, it's about end.
(I just finished two week long debugging session - approx 5 hours a day. It was nasty bug appearing only with optimalizations in embedded C, you can imagine joy when it came to life tonight. So now I am resting at pub with glass of cider knowing I am loosing needed sleep but I simply do not care right now. Sweet careless.)
rant
embedded
c
debugging
koan
rest