Commits on Sep 23, 2024

1. Implement EPx-only RP2040 USB Host …

   This commit fixes issue hathach#2776
   hathach#2776.
   The HCD now routes all USB transfers through the EPx
   endpoint. It no longer uses the "interrupt" endpoint
   hardware to handle INTERRUPT and BULK endpoints. The
   fix avoids the data sequence error handling bug in
   the RP2040 USB IP's "interrupt" endpoint hardware
   and allows the host to correctly drop the IN packet
   with the error without locking up. That fixes
   rppicomidi/usb_midi_host#14
   
   This fix requires the CPU to handle the SOF interrupt
   (every ms). That might be an issue for some systems.
   
   A benefit of this fix is that BULK transfers are
   more than 2x faster. There is an opportunity to speed
   them up further by forcing BULK transfer to begin
   immediately instead of waiting for the next SOF interrupt.
   
   This code has been tested with MSC flash drives, HID
   devices, and USB Hubs. It works with full speed and low
   speed HID devices connected at the same time through a hub.
   With the usb_midi_host application host driver, 4 MIDI
   devices plugged to a hub can send messages to each other
   (see the midi2usbhub project).

   

   rppicomidi committed Sep 23, 2024
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