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2a114013d4
Speed-switched desc_device_ss (bcdUSB 0x0320, bMaxPacketSize0 = 9), SuperSpeed config arrays from the TUD_*_SS_DESCRIPTOR templates, BOS, and EP0 / bulk buffer sizing for SuperSpeed across the device examples.
USBTMC
A USB Test & Measurement Class (USBTMC) instrument with USB488/SCPI support, behaving like a simple programmable instrument.
What it does
- Implements a USBTMC interface with USB488 capabilities and advertises SCPI support.
- Responds to
*IDN?with an identification string (TinyUSB,ModelNumber,SerialNumber,FirmwareVer123456). - Buffers other written messages and echoes them back as the query response, after a configurable delay.
- A
delay <ms>command adjusts that simulated response delay (0–10000 ms). - Maintains an IEEE-488.2 status byte (MAV/SRQ), and handles trigger, clear, and bulk abort requests.
- Supports the USBTMC indicator-pulse request, which briefly pulses the board LED.
- Uses an interrupt endpoint in addition to the bulk IN/OUT endpoints.
USB Descriptors
| Interface | Class driver |
|---|---|
| 0 | USBTMC |
Configuration
Notable tusb_config.h settings:
#define CFG_TUD_USBTMC 1
#define CFG_TUD_USBTMC_ENABLE_INT_EP 1
#define CFG_TUD_USBTMC_ENABLE_488 1
Building
CMake:
mkdir build && cd build
cmake -DBOARD=raspberry_pi_pico ..
cmake --build .
Make:
make BOARD=raspberry_pi_pico all
Try it
The device appears as a USBTMC test-and-measurement instrument. Talk to it with a VISA/SCPI tool (for example PyVISA). The included visaQuery.py opens the instrument and sends *IDN?:
python visaQuery.py