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feat(midi2): derive function blocks from the GTB descriptor
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* license: use SPDX identifiers for src/ headers
Replace the full ~20-line MIT license boilerplate on every src/ file with a
two-line SPDX tag (SPDX-FileCopyrightText + SPDX-License-Identifier), following
the REUSE convention used by CircuitPython and the Linux kernel. Removes ~3500
lines of duplicated boilerplate.
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Function Block Info (direction, group span, name) is derived from the GTB
descriptor as the single source of truth, so a device can expose multiple
Group Terminal Blocks with independent directions. Adds Function Block Name
notifications (tud_midi2_fb_name_cb) and an opt-in callback to answer UMP
Stream messages from the application (tud_midi2_stream_msg_cb). Ref #3571
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packet api
Signed-off-by: HiFiPhile <[email protected]>
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Default RX/TX buffers to EPSIZE for both device and host. Document
drain-in-loop on ump_read; example device callback drains until
empty.
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Match midi2_host pattern. Literal 256 underran HS endpoints (512B).
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Lets each instance return different NUM_GROUPS, NUM_FUNCTION_BLOCKS,
EP_NAME and PRODUCT_ID. Defaults fall back to the macros.
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MT is in byte 3 of the UMP word in LE memory, not byte 0. Buffers
at mps blocked RX xfer re-arm on partial packets.
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Signed-off-by: HiFiPhile <[email protected]>
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Alt 0 carries USB-MIDI 1.0 32-bit Event Packets, not UMP words; calling
the UMP API there would misinterpret the stream. Expose MIDI_PROTOCOL_MIDI1
and MIDI_PROTOCOL_MIDI2 in the public header so applications can branch on
the negotiated protocol.
Ref #3571
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Add native USB-MIDI 2.0 Device class driver to TinyUSB. Implements the
USB-MIDI 2.0 specification with both Alt Setting 0 (MIDI 1.0 fallback)
and Alt Setting 1 (UMP native) descriptor support.
Driver features:
- UMP (Universal MIDI Packet) read/write with atomic message framing
- Protocol negotiation: Endpoint Discovery, Config Request/Notify,
Function Block Discovery (embedded in driver)
- Group Terminal Block descriptor via GET_DESCRIPTOR
- Alt Setting switch handler with endpoint re-arm
- Static allocation, no dynamic memory, ISR-safe
Build system:
- Register midi2d_* in usbd.c driver table
- Add TUD_MIDI2_DESCRIPTOR macros to usbd.h
- Add config defaults (CFG_TUD_MIDI2_*) to tusb_option.h
- Add midi2_ump_word_count() to midi.h (shared by Device and Host)
- Add midi2_device.c/h to family.cmake and CMakeLists.txt
- Add midi2_device.h include to tusb.h
All changes guarded by #if CFG_TUD_MIDI2 (default 0). Zero impact on
existing drivers and examples.
Tested: Raspberry Pi Pico (RP2040), Linux ALSA, Windows MIDI Services
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