probe-rs/rusty-probe

MATLAB

170

49 commits

updated Feb 19, 2026

See the code

README

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.

alt text

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	10 MHz	24 MHz	15 MHz
Target interface support	JTAG, SWD, SWO, UART	SWD	SWD, UART	JTAG, SWD, UART, SWO Note: STM8/32 chips only	JTAG, SWD, SWO
IO voltage control	1.8-3.3V	3.3V	1.8-3.3V	1.6-3.3V	1.6-3.3V somtimes
Type	Open Source & Hardware	Open Source	Open Source Software	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.

Significant stargazers

Diego Barrios Romero

349 followers · starred Jun 2025

Robin Mueller

58 followers · starred Jan 2026

Oleksii Orlenko

440 followers · starred Apr 2025

Kostia R

134 followers · starred Nov 2024

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probe-rs/rusty-probe

MATLAB

170

49 commits

updated Feb 19, 2026

See the code

README

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.

alt text

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	10 MHz	24 MHz	15 MHz
Target interface support	JTAG, SWD, SWO, UART	SWD	SWD, UART	JTAG, SWD, UART, SWO Note: STM8/32 chips only	JTAG, SWD, SWO
IO voltage control	1.8-3.3V	3.3V	1.8-3.3V	1.6-3.3V	1.6-3.3V somtimes
Type	Open Source & Hardware	Open Source	Open Source Software	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