Deep Dive w/Scott: USB Host Debugging #adafruit
19Join Scott as he debugs CircuitPython's USB Host support and answers questions.
0:00 getting started
3:30 initial hellos
5:30 welcome to Deep Dive w/Scott
12:42 usbhost basic keyboard test configuration issue 8885
14:39 need uart to debug some USB issues
16:03 tiny usb debug streaming on desktop
19:40 restream settings
20:13 maybe tailscale VPN is a factor in frame drops
20:50 back to issue 8885 - look on github to see what changed
23:00 suspect language ID changes
26:44 start using _get_langid() in usb/core/Device.c
33:30 more git blaming on github usb/core/Device.c
35:04 get string descriptor
23:35 looking at USB web documentation
38:00 changing MP_ARRAY_SIZE to just sizeof to just get byte systes
40:00 back to _get_langid - and rebuilding
41:00 downloading new code using UF2
45:00 USB reference URLs pushed to github
48:11 Dig into TinyUSB for the next error
51:15 back to tinyusb on github
52:20 keyboards are the only thing that CP uses by default
53:00 keyboard boot protocol when you don't have a full USB stack
57:00 add some logging to endpoint open (tuh_edpt_open())
1:06:20 still looking at the EP claiming - that's not the reason for the error
1:11:50 continue with debugging "xfer failed"
1:26:05 have to unplug / re-plug USB Host Keyboard issue 8886
1:32:20 board_init is pretty early - printf stuff might break
1:34:38 comment out the recent change - prints too early are a problem
1:42:15 asking for clarification about initialization
1:44:00 prepare a partial PR for some of the fixes
1:45:20 enhance basic_keyboard.py - busy wait
1:48:00 PyCascades and open embedded talks upcoming in April
1:54:39 streaming experiments - restream, obs
1:56:38 wrap up / goodbye
1:57:45 experiments - stop tailscale
1:59:30 restream.io
2:00:16 - stream stopped
2:01:10 increasing stream rate 6800 ?
2:03:03 OBS and restream happy
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