rp2350-device-freertos

midi2 | Device MIDI 2.0

Raspberry Pi Pico 2 (RP2350), FreeRTOS

USB MIDI 2.0 device on the Raspberry Pi Pico 2 (RP2350, Cortex-M33), pure C99 over FreeRTOS-Kernel + TinyUSB upstream (the merged USB MIDI 2.0 device class, no fork). A deterministic catalog emitter cycles 58 UMP entries covering every defined message-type category of M2-104-UM, alongside a MIDI-CI responder. Two tasks, two static queues, zero heap.

USB identity

Field	Value
VID:PID	CAFE:407A (TinyUSB educational VID, development only)
Product	RP2350 FreeRTOS Bench MIDI 2.0
Manufacturer	midi2.diy
UMP Endpoint Name	RP2350 FreeRTOS Bench
FB 0	Main (Bidirectional, 1 group, MIDI 1.0 + 2.0 protocols)
MIDI-CI Manufacturer ID	{0x7D, 0x00, 0x00} (non-commercial prefix)

Layering

Layer	Owns
TinyUSB upstream	enumeration, MIDI 2.0 descriptors, built-in UMP Stream Discovery responder
src/pipeline.c (FreeRTOS)	usb_task is the sole owner of tud_midi2_*; midi_task runs the midi2 core; two static queues decouple them so multi-packet SysEx7 never interleaves
midi2 C99 core (../../src)	typed dispatch, UMP construction, SysEx7 reassembly, MIDI-CI responder
src/catalog.c / src/ci_responder.c	the 58-entry UMP catalog (host-unit-tested) and the device identity

Build

Requires Pico SDK 2.x, FreeRTOS-Kernel v11.2+ (with the Community-Supported-Ports submodule) and TinyUSB upstream (the SDK-bundled copy is MIDI 1.0 only).

PICO_SDK_PATH=/path/to/pico-sdk \
PICO_TINYUSB_PATH=/path/to/tinyusb \
FREERTOS_KERNEL_PATH=/path/to/FreeRTOS-Kernel \
cmake -B build -DPICO_BOARD=pico2
cmake --build build -j

Flash build/rp2350-device-freertos.uf2 in BOOTSEL mode.

Validation

lsusb | grep cafe:407a          # midi2.diy RP2350 FreeRTOS Bench MIDI 2.0
aseqdump -l | grep RP2350       # UMP endpoint, MIDI 2.0

Validated on hardware against the official MIDI 2.0 Workbench: MIDI-CI Discovery (Message Version 0x02), Profile Configuration and Property Exchange complete, zero errors and zero warnings. On Windows the MIDI Services Console lists it with Native data format = UMP and both protocols declared.

Spec coverage

UMP MT	Category	Spec
0x0	Utility (NOOP, JR Clock/Timestamp, DCTPQ, Delta Clockstamp)	M2-104-UM 7.2
0x1	System Common / Real-Time (all 10)	7.6
0x2	MIDI 1.0 Channel Voice	7.3
0x3	SysEx7 (complete + fragmented)	7.7
0x4	MIDI 2.0 Channel Voice, per-note included	7.4
0x5	SysEx8 + Mixed Data Set	7.8, 7.9
0xD	Flex Data (tempo, signatures, chord, text)	7.5
0xF	UMP Stream (Device Identity, Start/End of Clip)	7.1

MIDI-CI: Discovery, one Profile, Property Exchange (DeviceInfo, ChannelList, ProgramList). Inbound control: NoteOn on group 15 fires a single catalog entry; CC 120/121 pause and resume the cycle.

License

MIT, inherits the parent midi2 library. TinyUSB and FreeRTOS-Kernel retain their own licenses.