Every USB device must buffer isochronous data for at least 1 frame in
order to remove packet jitter within a frame. USB Specification Revision
2.0 describes necessary buffering in 5.12.5 Data Prebuffering. USB Audio
1.0 specification mentions buffering in 3.4 Inter Channel Synchronization.
Set bDelay to 1 instead of 0, because bDelay 1 is both the minimum
allowed value and matches the actual device behavior.
Signed-off-by: Tomasz Moń <tomasz.mon@nordicsemi.no>
Pass result of usb_transfer() as return value to the user,
and allow user to react accordingly, e.g. release net_buf on error.
Signed-off-by: Chun-Chieh Li <ccli8@nuvoton.com>
In order to bring consistency in-tree, migrate all subsystems code to
the new prefix <zephyr/...>. Note that the conversion has been scripted,
refer to zephyrproject-rtos#45388 for more details.
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
Until now the whole USB device stack code is located
in the top subsys/usb directory. Move it to own directory
in preparation for upcoming extension and rework of USB support.
Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>
