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Second stage: the USBSS SuperSpeed device driver (SPEED=super now links). The LINK layer is the same IP as the CH569 but the endpoint engine is the H417's reworked chain-DMA design (hardware SEQ_AUTO/ERDY_AUTO, persistent RB_EP_*_HALT, per-chain completion). The RCC/PHY/LINK bring-up and EP0 control sequences are transcribed from the WCH EVT USBSS device demo; data endpoints arm one chain per packet (burst 1) for correctness-first bring-up, matching the CH569 port's initial path - raise CFG_TUD_WCH_USB30_MAX_BURST once the hardware validates. Buffers may live anywhere in the shared SRAM (all DMA-reachable), so no bounce machinery is needed. - src/portable/wch/dcd_ch32h417_usb30.c (+ ch32h417_usb30_reg.h): full dcd with a STATE_CHG-driven LTSSM handler, LMP PORT_CAP/PORT_CFG exchange, EP0 DPH/ERDY flow with software sequence, chain-armed data endpoints, per-EP HALT stall, and a TIM12-backstopped runtime USB2 fallback that hands rhport 0 to ch32h417_usb2_* when SuperSpeed training fails (host has no SS port). - examples/device/*/skip.txt: add mcu:CH32H417 to the FreeRTOS + audio/video examples (no FreeRTOSConfig for this family yet), mirroring mcu:CH569. Build-verified: all 20 device examples build for SPEED=super, and cdc_msc for SPEED=high, clean under -Werror (riscv-none-elf-gcc 13.2). Hardware bring-up at 5 Gbps (usbtest battery, throughput) is pending rig availability. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01QWhrtHjbSVMKcY68vxBwBm
Audio Test Microphone
A minimal USB Audio Class 2.0 (UAC2) microphone that streams a generated test signal, useful for verifying the audio device stack end to end.
What it does
- Enumerates as a UAC2 microphone with 1 input channel at 48 kHz, 16-bit.
- An audio task fills a buffer with a continuously incrementing 16-bit ramp counter and writes it to the IN endpoint every 1 ms, simulating data from an I2S source. The counter resets when the streaming interface is closed.
- Handles UAC2 control requests: feature-unit mute/volume, clock-source sample-rate and clock-validity, and input-terminal connector.
- Blinks the on-board LED to indicate USB state (not mounted / mounted / suspended).
USB Descriptors
| Interface | Class driver |
|---|---|
| 0–1 | UAC2 audio (control + streaming), 1-channel microphone input |
Configuration
Notable tusb_config.h settings:
#define CFG_TUD_AUDIO 1
#define CFG_TUD_AUDIO_FUNC_1_SAMPLE_RATE 48000
#define CFG_TUD_AUDIO_ENABLE_EP_IN 1
#define CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_TX 1
#define CFG_TUD_AUDIO_FUNC_1_N_BYTES_PER_SAMPLE_TX 2 // 16-bit
#define CFG_TUD_AUDIO_EP_SZ_IN TUD_AUDIO_EP_SIZE(TUD_OPT_HIGH_SPEED, CFG_TUD_AUDIO_FUNC_1_SAMPLE_RATE, CFG_TUD_AUDIO_FUNC_1_N_BYTES_PER_SAMPLE_TX, CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_TX)
#define CFG_TUD_AUDIO_FUNC_1_EP_IN_SZ_MAX CFG_TUD_AUDIO_EP_SZ_IN
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/audio_test_freertos — identical single-channel UAC2 test microphone, with the device, audio, and LED-blink work split across FreeRTOS tasks.
Try it
The device appears as a single-channel USB microphone. On Linux, list it with arecord -l and capture with arecord (for example arecord -D hw:CARD=MicNode -c 1 -f S16_LE -r 48000 test.wav); the recorded samples form a rising ramp. The included src/plot_audio_samples.py records and plots the signal (requires sounddevice and matplotlib).