Jeff Probe - Open Source JTAG by Flirc

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.

Cheap and functional! Highly recommended.

Well made. Great price.

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 The creator's fork of software is extremely out of date and no longer builds in a modern Linux system.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.

My nightmare started when the device arrived and my computer running Windows 11 could not see the device, it could see a device without drivers. Two hours of hunting down the tools, Zadig, and fighting to get both PID installed. Hunted down the 'firmware' then discovered in order to load it I needed a Windows version of dfu-util, they have instructions on how to compile it. After a couple more hours I finally ran dfu-util:Device returned transfer size 4096DfuSe interface name: "Internal Flash "Downloading element to address = 0x08002000, size = 98716Last page at 0x0801a19b is not writeableAnd yes, he error is even misspelled,why does that not surprise me.I'm done, $60 would have saved me hours of wasted time. I left several posts at the sellers web, nothing.