Richard, thanks for looking into this.

For 64 led's I think the timing for each frame is 3,84ms. Does it work with 2ms?

Anyway, you did a great job on this. Really fast!

Well, the AN implied, or at least I wanted to be that way, this solution would be fast enough for the MCU to do other tasks.

But as you tested, yes, seems there is not enough time.

I want to use this strips for a 60 led's (1m bar) for medical purposes and the timing is very strict.

Thanks,
Ioannis