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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
MTP
A USB Media Transfer Protocol device backed by a small in-RAM filesystem that the host can browse, read from and write to.
What it does
- Presents a single MTP storage preloaded with two read-only objects:
readme.txtandtinyusb.png. - Supports core MTP operations: get device info, open/close session, get storage IDs and storage info, enumerate object handles, get object info, get object and get partial object, and a device property (device friendly name).
- Lets the host upload one additional object (SendObjectInfo / SendObject) into a 4 KB RAM buffer and delete objects (unless built read-only).
- Handles MTP class control requests: cancel, device reset and get device status.
- LED blink rate indicates bus state (not mounted / mounted / suspended).
USB Descriptors
| Interface | Class driver |
|---|---|
| 0 | MTP |
Configuration
Notable tusb_config.h settings:
#define CFG_TUD_MTP 1
#define CFG_TUD_MTP_EP_BUFSIZE 512
#define CFG_TUD_MTP_EP_CONTROL_BUFSIZE 16 // should be enough to hold data in MTP control request
// MTP device info
#define CFG_TUD_MTP_DEVICEINFO_EXTENSIONS "microsoft.com: 1.0; "
#define CFG_TUD_MTP_DEVICEINFO_SUPPORTED_OPERATIONS \
MTP_OP_GET_DEVICE_INFO, \
MTP_OP_OPEN_SESSION, \
MTP_OP_CLOSE_SESSION, \
MTP_OP_GET_STORAGE_IDS, \
MTP_OP_GET_STORAGE_INFO, \
MTP_OP_GET_OBJECT_HANDLES, \
MTP_OP_GET_OBJECT_INFO, \
MTP_OP_GET_OBJECT, \
MTP_OP_GET_PARTIAL_OBJECT, \
MTP_OP_DELETE_OBJECT, \
MTP_OP_SEND_OBJECT_INFO, \
MTP_OP_SEND_OBJECT, \
MTP_OP_RESET_DEVICE, \
MTP_OP_GET_DEVICE_PROP_DESC, \
MTP_OP_GET_DEVICE_PROP_VALUE, \
MTP_OP_SET_DEVICE_PROP_VALUE
#define CFG_TUD_MTP_DEVICEINFO_SUPPORTED_EVENTS \
MTP_EVENT_OBJECT_ADDED
#define CFG_TUD_MTP_DEVICEINFO_SUPPORTED_DEVICE_PROPERTIES \
MTP_DEV_PROP_DEVICE_FRIENDLY_NAME
#define CFG_TUD_MTP_DEVICEINFO_CAPTURE_FORMATS \
MTP_OBJ_FORMAT_UNDEFINED, \
MTP_OBJ_FORMAT_ASSOCIATION, \
MTP_OBJ_FORMAT_TEXT, \
MTP_OBJ_FORMAT_PNG
#define CFG_TUD_MTP_DEVICEINFO_PLAYBACK_FORMATS \
MTP_OBJ_FORMAT_UNDEFINED, \
MTP_OBJ_FORMAT_ASSOCIATION, \
MTP_OBJ_FORMAT_TEXT, \
MTP_OBJ_FORMAT_PNG
Building
CMake:
mkdir build && cd build
cmake -DBOARD=raspberry_pi_pico ..
cmake --build .
Make:
make BOARD=raspberry_pi_pico all
Try it
The device enumerates as an MTP device and shows up in a file browser (e.g. the Files/Explorer app, or mtp-detect / mtp-files from libmtp). You should see readme.txt and tinyusb.png; you can copy a small file onto the device and delete files.