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The Rusty Probe

This is an open hardware probe for the Serial Wire Debug (SWD) and JTAG protocol. Based on the RP2040 MCU.

Firmware

The firmware is available here and is open-source.

Features

  • The 10-pin Cortex-Debug connector is used.
  • The programming connector is the Tag Connect TC2030, however for just loading firmware the USB bootloader is recommended.
  • Castellated vias for all programming pins, power and 2 GPIOs.
  • USB-C connector.
  • Target 5V and Vtarget is protected with an diode circuit to not have current flow from the target to the host.
  • The probe support 1.8v - 3.3v signal voltage and can track Vtarget.
  • The key pin on the Cortex-Debug can be connected to the protected 5V.

The schematic can be found in the GitHub actions, full production files are generated for each commit.

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Comparison

Here is a small comparison with a few different probes:

Rusty Probe PicoProbe Raspberry Pi Debug Probe STLinkV3 JLink
Max speed 62 MHz ? 10 MHz 24 MHz 15 MHz
Target support any any any STM32 any
IO voltage control 1.8-3.3V 3.3V 3.3V 1.6-3.3V 1.6-3.3V somtimes
Type Open Source & Hardware Open Source Proprietary Proprietary Proprietary
Language Rust C C C C
Protocol CMSIS-DAP CMSIS-DAP CMSIS-DAP Proprietary CMSIS-DAP
Programming connector Cortex-M Debug 10p - JST Cortex-M Debug 14p Cortex-M Debug 10p
USB speed 12 MBit/s 12 MBit/s 12 MBit/s 480 MBit/s 12 MBit/s

Where to buy

The probe is available in the probe-rs shop. But you are free to build one yourself as well!

License

This work is licensed under CERN-OHL-P.

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