ansible: usb connect timing lag

[tehn]

investigate timing glitch on usb connect

[audionerd]

i’ve noticed this when ansible is clocked externally. connecting a grid (via switch) causes kria to freeze and miss a beat.

[csboling]

Sounds like this has been investigated some, the search is still on for older discussion of this.

[scanner-darkly]

found it:

https://llllllll.co/t/teletype-3-feature-requests-and-discussion/16219/281
https://llllllll.co/t/teletype-3-feature-requests-and-discussion/16219/285
https://llllllll.co/t/teletype-3-feature-requests-and-discussion/16219/286

the experimental fix for it was commenting out this delay:

https://github.com/monome/libavr32/blob/master/src/usb/ftdi/uhi_ftdi.c#L194

not sure what's the purpose of that delay (to let the rest of initialization happen properly probably?) and whether removing it fixes it for some grids but breaks it for some others.