Follow-up on newly introduced USB MIDI2 support.
Prefix with usbd_, use midi2 consistently.
Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>
This new implementation is written from scratch and is not tied to the
image manager and MCUboot. It allows the user to define their own
backend and use a simple macro to instantiate an image. On the USB side
this is represented by an interface. The number of possible images is
configurable using the Kconfig option, and is a fairly inexpensive
approach since it only changes the size of the pointer array. The number
of images is only limited by the number of possible interfaces in a
configuration. The class implementation does not support multiple
instances, as there is no real use for it. However, it does provide two
class instances, one for runtime mode and one for DFU mode. The switch
from runtime to DFU mode can only be performed by the user application,
i.e. the application receives a notification when the host wants to
switch to DFU mode, and then the application can disable the runtime
configuration and enable the DFU configuration. This implementation does
not support switching to the DFU mode by bus reset issued by the
host.
Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>
This adds a new USB device class (based on usb/device_next) that implements
revision 2.0 of the MIDIStreaming interface, a sub-class of the USB audio
device class. In practice, the MIDI interface is much more simple and has
little in common with Audio, so it makes sense to have it as a separate
class driver.
MIDI inputs and outputs are configured through the device tree, under a
node `compatible = "zephyr,usb-midi"`. As per the USB-MIDI2.0 spec,
a single usb-midi interface can convey up to 16 Universal MIDI groups,
comprising 16 channels each. Data is carried from/to the host via
so-called Group Terminals, that are organized in Group Terminal Blocks.
They are represented as children of the usb-midi interface in the device
tree.
From the Zephyr application programmer perspective, MIDI data is exchanged
with the host through the device associated with the `zephyr,usb-midi`
interface, using the following API:
* Send a Universal MIDI Packet to the host: `usb_midi_send(device, pkt)`
* Universal MIDI Packets from the host are delivered to the function passed
in `usb_midi_set_ops(device, &{.rx_packet_cb = handler})`
Compliant USB-MIDI 2.0 devices are required to expose a USB-MIDI1.0
interface as alt setting 0, and the 2.0 interface on alt setting 1.
To avoid the extra complexity of generating backward compatible USB
descriptors and translating Universal MIDI Packets from/to the old
USB-MIDI1.0 format, this driver generates an empty MIDI1.0 interface
(without any input/output); and therefore will only be able to exchange
MIDI data when the host has explicitely enabled MIDI2.0 (alt setting 1).
This implementation is based on the following documents, which are referred
to in the inline comments:
* `midi20`:
Universal Serial Bus Device Class Definition for MIDI Devices
Release 2.0
https://www.usb.org/sites/default/files/USB%20MIDI%20v2_0.pdf
* `ump112`:
Universal MIDI Packet (UMP) Format and MIDI 2.0 Protocol
With MIDI 1.0 Protocol in UMP Format
Document Version 1.1.2
https://midi.org/universal-midi-packet-ump-and-midi-2-0-protocol-specification
Signed-off-by: Titouan Christophe <moiandme@gmail.com>
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>
Add doxygen group with MSC device API and document macro to create
mapping between disk access and MSC LUN.
Signed-off-by: Tomasz Moń <tomasz.mon@nordicsemi.no>
Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>
Mostly moved and reorganised content to the Connectivity chapter,
separated API references. Fill in some gaps in the USB device
documentation.
Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>
