Tim Watts wrote:

Andy Burns wrote:

do your own bit-banging, you could probably drive 8 strings of RGB
LEDs per GPIO port.

I wonder how practical that would be - bit banging at 400kHz (is that
right - it's been a while?)

800kHz

Does a Pi have DMA based GPIO?

seems a pretty realtime operation for a full on OS like linux (unless
you actually use RT features or write it as a kernel driver or
something???

Can't remember the name (banana pi? Latte Panda?) but oneof the
pi-alikes has an arduino "slave" onboard, which could do the bitwise
I/O, while the linuxy section decided what colours to send.