Ordering by element size prevents alignment holes, and as a consequence the
host mode version of the struct is the same size as device, as pad bytes at
the end are used instead.
Don't mark IN buffers as available during the last 200us of a full-speed
frame. This avoids a situation seen with the USB2.0 hub on a Raspberry
Pi 4 where a late IN token before the next full-speed SOF can cause port
babble and a corrupt ACK packet. The nature of the data corruption has a
chance to cause device lockup.
Use the next SOF to mark delayed buffers as available. This reduces
available Bulk IN bandwidth by approximately 20%, and requires that the
SOF interrupt is enabled while these transfers are ongoing.
Inherit the top-level enable from the corresponding Pico-SDK flag.
Applications that will not use the device in a situation where it could
be plugged into a Pi 4 or Pi 400 (for example, when directly connected
to a commodity hub or other host) can turn off the flag in the SDK.
v2: use a field in hw_endpoint to mark pending.
v3: Partial rewrite following review comments
- Stub functions out if the workaround is not required
- Only force-enable SOF while any vulnerable endpoints are active
- Respect dcd_sof_enable() functionality
- Get rid of all but necessary ifdef hackery
- Fix a bug where the "endpoint lock" was used with an uninitialised pointer.
The next change to the driver requires the export of these functions. Leave the
lock unimplemented for now.
Also move hw_set and hw_clear aliases into the top-level header file.
This allows to set custom descriptive names for virtual MIDI
ports/cables. A MIDI port offers different functionality on
the same physical USB device. The names make it easier to
distinguish one from the other.
ISO packet size is up to 1023 for full speed device.
Upon completion of ISO reception, reported length of incoming packet
was truncated to one byte only.
This results in incorrect data stream for higher bit rates
48 samples * 4 bytes per sample * 2 channels = 384 bytes of data
and 128 was reported.
There is no change in logic extending xact_len to uint16_t fixes the issue.
