ST Synopsys port lacks SOF support

[battlesnake]

Related area

ST Synopsys port

Hardware specification

Cortex M7, STM32H750, USB3300, custom board

Is your feature request related to a problem?

The port currently lacks support for USB SOF frames.

Describe the solution you'd like

I will provide a PR with my proposed solution

I have checked existing issues, dicussion and documentation

• I confirm I have checked existing issues, dicussion and documentation.

[battlesnake]

PR: #1685

[PanRe]

Just a short question, the driver in portable/synopsis/dwc2 does not work for you?

[battlesnake]

I didn't use try it. I didn't find info in the docs about which port(s) to use, so I tried st/synopsys (since using ST part), and it worked after adding the SOF feature.

[battlesnake]

Besides (presumably) supporting SOF already, what are other differences of that synopsys/dw2 port vs. st/synopsys?

[PanRe]

It fuses the device driver for multiple MCUs as far as i know. I don't know why the st/synopsis driver is still there, maybe due to backward compatibilities.

[battlesnake]

Thanks, I'll give it a try in an hour or so [once I've hopefully got UAC2 interrupt endpoint working and delivering control-change messages to the host].

[battlesnake]

Using synopsis/dwc2, I get into a crash-loop.
Almost certainly due to configuration on my side though.

I'll go back to using st/synopsys for now.
Once I've got my UAC2 interrupt status endpoint working, then I'll try synopsys/dwc2 again and see if I can either fix the issue in my code, or file a PR if it's due to a bug in tinyusb.