[usbdpi] Improvements to USB DPI interface

lowRISC / opentitan

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[usbdpi] Improvements to USB DPI interface #44

Closed mdhayter closed 1 year ago

mdhayter commented 5 years ago

The usbdpi interface currently includes the test stimulus in the main-line code and is quite fragile as regards to timing.

Improvements:

Read stimulus from a file (will require the DPI state machine to understand higher level constructs like packets)
Build in initialization of USB device and make the simulation available as a usbip device. This allows the simulated USB device to be "plugged in" to a virtual USB port on the host.

sjgitty commented 4 years ago

On a mission to clean up old issues, scraping from stalest to freshest.

@vogelpi @mdhayter does @stefanlipunner's recent work in this area change the status of this issue? Related comment: we will initiate a conversation on how to move forward with USB soon.

mdhayter commented 4 years ago

The recent work was a good clean-up but doesn't really address the code being fragile to timing. I think both these are possible approaches to improvements.

GregAC commented 1 year ago

@alees24 is currently undertaking significant work in this area. I think this issue is superseded by issues he has opened and work he's currently doing so closing.