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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
HID Composite
A single USB HID interface that combines several HID functions using report IDs: keyboard, mouse, stylus pen, consumer control, and gamepad.
What it does
- Presents one HID interface carrying five report types, distinguished by report ID: keyboard, mouse, stylus pen, consumer control, and gamepad.
- Polls the board button every 10 ms and, on each cycle, sends a chain of reports (the next report is queued from
tud_hid_report_complete_cb):- Keyboard: while the button is held, sends the
Akeycode; releasing sends an empty report. - Mouse: moves diagonally (+5, +5) each cycle.
- Stylus pen: while the button is held, reports tip-switch + in-range at position (100, 100).
- Consumer control: while the button is held, sends Volume Decrement; releasing sends a release report.
- Gamepad: while the button is held, sets the hat to Up and presses button A; releasing recenters.
- Keyboard: while the button is held, sends the
- If the device is suspended, pressing the button issues a USB remote wakeup.
- The LED blinks to indicate USB state (250 ms not mounted, 1000 ms mounted, 2500 ms suspended). When the host turns on Caps Lock, the LED is driven solid on via the keyboard's OUTPUT report.
USB Descriptors
| Interface | Class driver |
|---|---|
| 0 | HID (keyboard + mouse + stylus pen + consumer control + gamepad, composite report IDs) |
Configuration
Notable tusb_config.h settings:
#define CFG_TUD_HID 1
#define CFG_TUD_HID_EP_BUFSIZE 16
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/hid_composite_freertos — the USB device and HID logic run as FreeRTOS tasks (LED via a software timer). It exposes four report types (keyboard, mouse, consumer control, gamepad) and, unlike this example, omits the stylus-pen report.
Try it
After flashing, the board enumerates as a single HID device that the host recognizes as a keyboard, mouse, consumer-control, gamepad, and stylus. Press and hold the button to type A, decrease the volume, press gamepad button A, and report stylus contact; the mouse pointer drifts toward the bottom-right continuously.