So reading this thread has me wondering:
http://arduino.cc/forum/index.php/topic,80567.0.html
why would you suggest WS2811 LEDs on an Arduino forum? I would need a newer clocked arduino (uno, leo, teensy3, etc) to just keep up with >50 LEDs. Specifically, something off-brand 'duino compatible with a honking processor.
Nobody on that thread mentioned fastSPI, though. Is fastSPI fast enough to handle a 2811 on an 16MHz arduino? 32? 32 with interrupts?
Your last post says 500us to latch, but the code says 50us... which the other thread says is impossible/flakey for more than a few leds.
I just seems to me like a pretty significant detail to skip, no?
fc