intergatedcircuits / c2usb Goto Github PK

This is about porting over the existing implementation - which consists of the original standard protocol, and ST's extension - to here. Nothing too complicated, and the API is satisfactory to be kept as is.

This one is quite the effort, mostly due to the complexity of the SCSI commandset on top of the USB protocol. Low priority for me, how about you?

Porting over the existing implementation, likely with a redesign of the application interface. Hooking into zephyr's network stack would be a good validation target, and easy to get started with, since the USB device is ported already.

The CDC ACM class is implemented on the function level, but it's missing an application interface to be of any use. The reason why such thing doesn't exist is because my projects don't need it at the moment. If yours do, let me know below so we can brainstorm ideas on what it should look like.

I do want to port this project to STM32. I briefly considered using the HAL libraries this time, but after a short time I realized it's (still) very cumbersome to cleanly integrate anything into the HAL project design. So my plan is to refactor the old register-level port of the USB device IP of STM32 MCUs with simpler integration into STM32 projects. This will allow using proper endpoint buffer allocations, which is a key for getting the flexibility needed for composite designs.

The same would need to be done for the STM32 / Synopsis OTG IP, however the complexity of that driver is just so much higher that I don't want to deal with it at this point.

The audio class's flexibility / complexity was the original motivation to redesign my USB stack from the basics, and it's definitely something I want to see done when I get the chance. As I haven't dealt with this before, and the documentation is a LOT to deal with, expect a lot of effort here.

This discussion revealed that all HID report types should be both gettable and settable. Now waiting for somebody to request to get this fixed.