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Class drivers: skip and account the SS endpoint companion descriptor in every descriptor walk (hid, midi, midi2, ecm_rndis, printer, mtp, usbtmc), via a shared usbd_skip_ss_ep_companion() helper in usbd_pvt.h (cdc/ncm already handled; vendor/dfu naturally tolerant). usbtmc buffer grows to 1024 at SS to satisfy its packet-multiple assert. bth/audio/video are left FS/HS-only (ISO-centric; ISO is unsupported on the CH569 dcd). usbd.h: new SS template macros TUD_HID_SS_DESCRIPTOR(+INOUT), TUD_MIDI_SS_DESCRIPTOR (+ DESC_EP_SS part), TUD_MIDI2_DESC_ALT1_EP_SS, TUD_PRINTER_SS_DESCRIPTOR, TUD_MTP_SS_DESCRIPTOR, TUD_USBTMC_BULK_SS_DESCRIPTORS/INT_SS_DESCRIPTOR, with _SS_DESC_LEN counterparts (bulk endpoints hardcode 1024, companion after every EP). Examples: 17 bulk/interrupt examples gain the full SS descriptor set (EP0 512/64 clamp, SS device descriptor bcdUSB 3.20 mps0=2^9, SS config with companions, BOS caps, speed-switched callbacks): cdc_dual_ports, cdc_msc_freertos, dfu, dfu_runtime, dynamic_configuration, hid_boot_interface, hid_composite(+freertos), hid_generic_inout, hid_multiple_interface, midi_test(+freertos), midi2_device, msc_dual_lun, mtp, printer_to_cdc, usbtmc, webusb_serial. msc_dual_lun is un-skipped for CH569 using read-only flash disks (16KB RAM can't hold two 8KB RAM disks, same as ch32v10x/v20x boards). Validation: full example sweep green for hydrausb3_v1 (SPEED=super, 19 device ELFs) and raspberry_pi_pico; wTotalLength == sizeof() verified for every SS configuration array in the built ELFs; ceedling 65/65; pre-commit clean; code-size delta +0.0% on rp2040 (SS code folds out on non-SS builds). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019MRGjBT2NBkCoWwyDT4LaE
MIDI Test
A USB MIDI device that continuously plays a fixed melody, useful for verifying USB MIDI enumeration and streaming.
What it does
- Sends a repeating sequence of note-on / note-off messages (cable 0, channel 1) about every 286 ms.
- Drains any incoming MIDI packets (read and discarded) so the host sender never blocks on a full input port.
- Blinks the board LED to indicate USB state (not mounted / mounted / suspended).
USB Descriptors
| Interface | Class driver |
|---|---|
| 0–1 | MIDI (Audio Control + MIDI Streaming) |
Configuration
Notable tusb_config.h settings:
#define CFG_TUD_MIDI 1
#define CFG_TUD_MIDI_RX_BUFSIZE (TUD_OPT_HIGH_SPEED ? 512 : 64)
#define CFG_TUD_MIDI_TX_BUFSIZE (TUD_OPT_HIGH_SPEED ? 512 : 64)
Building
CMake:
mkdir build && cd build
cmake -DBOARD=raspberry_pi_pico ..
cmake --build .
Make:
make BOARD=raspberry_pi_pico all
FreeRTOS variant
A FreeRTOS build is in examples/device/midi_test_freertos — identical MIDI melody playback, with the device, MIDI, and LED-blink work split across FreeRTOS tasks.
Try it
The device shows up as a MIDI port. On Linux, list ports with aseqdump -l, then watch the incoming stream with aseqdump -p <client:port> (you should see a steady run of note on/off events), or route the port into a synth such as FluidSynth/qsynth to hear the melody.