---
product_id: 168703887
title: "Jeff Probe - Open Source JTAG by Flirc"
brand: "flirc"
price: "174 Lei"
currency: RON
in_stock: true
reviews_count: 9
category: "Flirc"
url: https://www.desertcart.ro/products/168703887-jeff-probe-open-source-jtag-by-flirc
store_origin: RO
region: Romania
---

# Built-in voltage level translator Multi-target JTAG & SWD support Open source & customizable hardware Jeff Probe - Open Source JTAG by Flirc

**Brand:** flirc
**Price:** 174 Lei
**Availability:** ✅ In Stock

## Summary

> 🕵️‍♂️ Debug smarter, not harder — the open source probe that keeps you ahead of the curve!

## Quick Answers

- **What is this?** Jeff Probe - Open Source JTAG by Flirc by flirc
- **How much does it cost?** 174 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/168703887-jeff-probe-open-source-jtag-by-flirc)

## Best For

- flirc enthusiasts

## Why This Product

- Trusted flirc brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact & Versatile:** Small form factor with dual USB interfaces—one for GDB server, one for UART—maximizing your workflow efficiency.
- • **Open Source Freedom:** Fully open hardware and software design lets you customize and adapt the probe to your unique debugging needs.
- • **Cost-Effective Innovation:** Affordable alternative to premium probes without sacrificing essential debugging features, perfect for startups and makers.
- • **Community-Driven Development:** Built to give back to the embedded community and empower students and professionals alike with accessible JTAG tools.
- • **Universal Debugging Powerhouse:** Supports a vast range of MCUs from Raspberry Pi RP2040 to STM32 series, ensuring seamless integration across your projects.

## Overview

Jeff Probe by Flirc is an open source JTAG debugging tool inspired by the Black Magic Probe, designed for broad MCU compatibility including Raspberry Pi Pico and STM32 series. Featuring a built-in voltage translator and dual USB interfaces for GDB and UART, it offers a compact, cost-effective solution ideal for embedded developers seeking customizable, community-driven hardware.

## Description

Jeff Probe is an open source JTAG probe based entirely off the popular black magic probe. We needed a cost effective solution for in house debugging, the ability for customization, and something we can include on test fixtures. We leveraged our volume and made Jeff Probe in hopes to give back to the community and give students an opportunity to get an affordable JTAG solution. Unique feature for 2 wire serial interfaces, allows unused JTAG pins to route UART for single wire connection. Shows up as two USB interfaces, one as the GDB server, one as the UART to the slave device.

Review: Nice cheaper alternative to the Black Magic Probe - A great little debug probe that is comparable to the official black magic probe with a less powerful mcu. The price reflects this, however. Of course, you could always flash the BMP firmware onto a cheap stm32 dev board, but I'd rather buy this because it comes in a very compact form factor and provides the handy UART port as well.
Review: No software support and missing documentation, better off with the real thing - I've been doing embedded development professionally for close to two decades, and the Jeff probe looked like it might hit the spot for a very cheap SWD/JTAG adapter for embedding in automated test fixtures or giving to coworkers that don't need to program very often. The only reason I didn't get a real BlackMagic Probe was that they are out of stock everywhere (likely due to the STM32 shortage that is ongoing). There is very little documentation on what makes this hardware different from the real BMP, and it took me longer than I care to admit to realize this is running a SAMD21, not an STM32. The creator's fork of software is extremely out of date and no longer builds in a modern Linux system. Support for the Jeff Probe was never up streamed to BMP's repos, so we can't run the latest code either. I'm sure with some hacking I could port forward to the newest BMP, but this was a stab at a $15 fix, and it looks like it didn't pay off. The creator made the statement several times on their website that it runs "the exact same firmware as the BMP" which isn't really the case as a build of their `main` doesn't support the `jeff` probe target with the SAMD21. I totally get that it takes effort to support hardware after release, and that this feels more like a "put some open source hardware out there and see what happens" kind of things. That being said, in the current state, I couldn't recommend this to either a novice or expert unless the creator made efforts to update the software support or get support in mainline BMP.

## Features

- Supports many targets, including Raspberry Pi Pico
- Open Source and Open Hardware, Based on Black Magic Probe
- Built In Voltage Translator
- Raspberry Pi: RP2040
- Atmel: SAMD20, SAMD21, SAM32, SAM3X, SAM3S, SAM3U, SAM4L, SAM4S
- Nordic: 51 and 52 Series.
- Freescale: KL25, KL27, KL02, KE04. Silicon Labs: EFM32, EZR32
- NXP: LPC8xx, LPC11XX, LPC15XX, LPC43XX
- Texas Instruments: LM3S, TM4C
- ST Micro: STM32F0, STM32F1, STM32F2, STM32F3, STM32F4, STM32F7, STM32H7, STM32G0, STM32G4, STM32L0, STM32L1, STM32L5

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07ZK4LFTQ |
| Best Sellers Rank | #375,946 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1,530 in Test Probes & Leads |
| Brand | Flirc |
| Color | black |
| Customer Reviews | 3.9 3.9 out of 5 stars (56) |
| Date First Available | October 24, 2019 |
| Item Weight | 0.704 ounces |
| Item model number | FL-10269 |
| Manufacturer | Flirc |
| Number of Processors | 1 |
| Operating System | Linux |
| Package Dimensions | 2.4 x 1.9 x 1 inches |
| Processor | cortex |
| RAM | LPDDR |
| Series | Jeff Probe |
| Wireless Type | Bluetooth |

## Product Details

- **Brand:** Flirc
- **CPU Model:** Cortex
- **Connectivity Technology:** USB
- **Model Name:** Jeff Probe
- **Operating System:** Linux

## Images

![Jeff Probe - Open Source JTAG by Flirc - Image 1](https://m.media-amazon.com/images/I/51RATFHJutL.jpg)

## Questions & Answers

**Q: Does it come with the cable to go from this board to the target board?**
A: Yes and a UART breakout cable.

**Q: Can this product be used for swd with an arm processor?**
A: Yes, the Black Magic Probe does support SWD as well as JTAG.

**Q: Can i use this with a saml21 and mplabx?**
A: Should be able to, as the data sheet for the SAML 21 states "two-pin Serial Wire Debug (SWD) programming, testing, and debugging interface" which the Black Magic Probe does support (as it supports SWD and JTAG).

**Q: Can this be used to program nrf52832?**
A: Yes, the nrf52832 is a SoC based on a Arm cortex-M4 CPU. The Jeff Probe runs a modified version of the black magic probe firmware, which is designed to debug/program most ARM CPUs

## Customer Reviews

### ⭐⭐⭐⭐⭐ Nice cheaper alternative to the Black Magic Probe
*by B***S on July 9, 2020*

A great little debug probe that is comparable to the official black magic probe with a less powerful mcu. The price reflects this, however. Of course, you could always flash the BMP firmware onto a cheap stm32 dev board, but I'd rather buy this because it comes in a very compact form factor and provides the handy UART port as well.

### ⭐ No software support and missing documentation, better off with the real thing
*by L***L on June 20, 2022*

I've been doing embedded development professionally for close to two decades, and the Jeff probe looked like it might hit the spot for a very cheap SWD/JTAG adapter for embedding in automated test fixtures or giving to coworkers that don't need to program very often. The only reason I didn't get a real BlackMagic Probe was that they are out of stock everywhere (likely due to the STM32 shortage that is ongoing). There is very little documentation on what makes this hardware different from the real BMP, and it took me longer than I care to admit to realize this is running a SAMD21, not an STM32. The creator's fork of software is extremely out of date and no longer builds in a modern Linux system. Support for the Jeff Probe was never up streamed to BMP's repos, so we can't run the latest code either. I'm sure with some hacking I could port forward to the newest BMP, but this was a stab at a $15 fix, and it looks like it didn't pay off. The creator made the statement several times on their website that it runs "the exact same firmware as the BMP" which isn't really the case as a build of their `main` doesn't support the `jeff` probe target with the SAMD21. I totally get that it takes effort to support hardware after release, and that this feels more like a "put some open source hardware out there and see what happens" kind of things. That being said, in the current state, I couldn't recommend this to either a novice or expert unless the creator made efforts to update the software support or get support in mainline BMP.

### ⭐⭐⭐⭐⭐ Neat little black magic probe
*by K***T on March 7, 2020*

Well made. Great price.

## Frequently Bought Together

- Jeff Probe - Open Source JTAG by Flirc
- Adafruit 10-pin 2x5 Socket-Socket 1.27mm IDC (SWD) Cable - 150mm long [ADA1675]
- Treedix 2pcs JTAG Breakout Board Adapter Converter SWD Breakout Jtag Debug Board with 2 Row 1.27mm Pitch 10pins Female to Female IDC Connector Flat Flexible Gray Ribbon Jumper Cable 200mm for J-Link

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*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-03-01*