Merge remote-tracking branch 'tinyusb/master' into pr-osal-spin-deinit

Signed-off-by: HiFiPhile <[email protected]>

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+# MIDI 2.0 Song Sender
+
+USB MIDI 2.0 Device example that plays "Twinkle Twinkle Little Star" using
+native UMP (Universal MIDI Packet) format with full MIDI 2.0 expression.
+
+## MIDI 2.0 Features Demonstrated
+
+- 16-bit Velocity (vs 7-bit MIDI 1.0)
+- 32-bit Control Change values
+- 32-bit Pitch Bend (vs 14-bit MIDI 1.0)
+- 32-bit Channel Pressure (Aftertouch)
+- 32-bit Poly Pressure (Per-Note Aftertouch)
+- Per-Note Management (MIDI 2.0 exclusive)
+- Program Change with Bank Select
+- JR Timestamps
+
+## USB Descriptor
+
+The device exposes both USB-MIDI 1.0 (Alt Setting 0) and USB-MIDI 2.0 (Alt Setting 1)
+as required by the USB-MIDI 2.0 specification. A MIDI 2.0 capable host (e.g. Windows
+MIDI Services) will select Alt Setting 1 for native UMP transport. Legacy hosts use
+Alt Setting 0 with automatic MIDI 1.0 fallback.
+
+## Hardware
+
+- Any RP2040 board with USB (e.g. Raspberry Pi Pico)
+- LED on GPIO 25: steady = playing, slow blink = waiting for host
+
+## Building
+
+```bash
+mkdir build && cd build
+cmake -DBOARD=raspberry_pi_pico -DPICO_SDK_FETCH_FROM_GIT=on -G Ninja ..
+cmake --build .
+```
+
+## Flashing
+
+Hold BOOTSEL, connect USB, drag `midi2_device.uf2` to the RPI-RP2 drive.
+
+## Testing
+
+**Linux:**
+```bash
+aseqdump -p "MIDI 2.0 Device"
+```
+
+**Windows (MIDI 2.0 native):**
+```powershell
+midi endpoint list
+midi endpoint monitor
+```
+
+## Song Data
+
+Twinkle Twinkle Little Star in C major, 120 BPM. Six phrases with dynamic
+shaping (pp to ff crescendo and back), pitch bend vibrato on sustained notes,
+and channel/poly pressure for expression. All values use genuine MIDI 2.0
+resolution with no 7-bit equivalent.