mcgurk / arduino-ws2811-rotary-rgb-led-strip Goto Github PK

Hey, I followed your guide:
https://github.com/mcgurk/Arduino-WS2811-rotary-RGB-led-strip/blob/master/OrangePi.md
with my OrangePi 3 LTS to run a 256 led matrix

It works great, except when I'm running it at full speed without any delays, there's an occasional unexpected high intensity white flash from all LEDs.

my code is very simple:

  n = 0
  fnum = 0
  start_time = time.time()
  while True:
    ws2812.write2812(spi, data[n])
    n = (n + 1) % 6
    fnum += 1
    # time.sleep(0.02)
    now = time.time()
    if now - start_time > 1:
        print(fnum)
        fnum = 0
        start_time = now

just running through 6 preset patterns
When I'm running it like this, it prints around 111 FPS, (with numpy imported)
And I'm seeing these flashes every 4-5 seconds

if I uncomment the time.sleep(), it goes down to 33 FPS, and the flashes are less frequent but they still happen about every 20 seconds.
Any idea what's going on?

OS I installed is Ubuntu server, so there's no X or desktop running in the background and I'm connected to the OrangePi via SSH.