So I ported my stock ATtiny game of life to the Digispark (
https://github.com/pfriedel/TinyLife with some changes to the led_dir and led_out definitions - it took me a bit to realize that P0-P5 are just the ATtiny port B lines. Convenient. ) and while it looks great while plugged in to a USB power supply, when it's plugged in to a USB host device (i.e. laptop USB port, USB hub, etc) the LED nearest P4 stays pretty dimly lit while the next one over flickers every now and then. And while I hadn't tested it before now, it seems like it's making my USB root slightly unhappy - my keyboard is going offline every now and then. Before I dig out a USB explorer, is it possible the charlieplex PWM is making just enough noise to my USB system that the host is resetting it out of a sheer sense of self preservation? That is, the D+ and D- lines aren't isolated from the P0-5 in any meaningful way so all the signalling I'm generating is getting dumped onto the host to reject?
