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hubmartin / WS2812B_STM32F4

WS2812 DMA library with low RAM needs. Up to 16 paralel outputs and thousands of LEDs on each of them
MIT License
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STM32F407 Running 16 strips, 100leds/strip. Flicker #16

Open PWawrow opened 1 year ago

PWawrow commented 1 year ago

Hello. I get random flickering leds 5-6 for per strip, other seem to work fine. Maybe something with timing? Hardware: STM32F407VET6 SYSCLK-168MHz APB2 TIMER CLOCK-168MHz. I'm using rainbow example from library.

hubmartin commented 1 year ago

Try to use a different SETPIX option. Lower numbers are less effective. Test it and see whether the issue stays or gets worse. Try to lower a number of parallel strings. If it helps, then the DMA interrupts for some reason is not fast enough to fill the buffers on the fly. Try to look with the oscilloscope/logic analyzer to see what happens on that fifth or sixth LED and whether the issue happens at the same time on multiple outputs. Check whether the DMA IRQs have the highest priority if you have added other code using IRQ (probably not if you use just the example code)

hubmartin commented 1 year ago

Which compiler optimization level do you use? -O.. ?