Introduce UDC_BUF_POOL_*_DEFINE macros based on NET_BUF_POOL_*_DEFINE
macros but use our own version of alloc and unref callbacks to get
buffers with specific alignment and granularity. Also, do not use ref
callback because it breaks alignment.
Also introduces helper macros for defining and checking UDC
driver-compliant static buffers.
Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>
The sample illustrates how to calculate feedback value based on I2S
sample clock measurement or indirect I2S FRAMESTART and USBD SOF.
The sample is currently only supported on nrf5340dk_nrf5340_cpuapp
target because the feedback measurement uses target specific
peripherals.
While it should be possible to perform feedback value calculation
entirely in software (possibly with some additional filtering due
to software scheduling jitter), the I2S API does not provide necessary
timestamps.
Signed-off-by: Tomasz Moń <tomasz.mon@nordicsemi.no>
