blueTag - A Raspberry PI Pico JTAGulator Alternative

First… just saying. Also, I love your videos. Look forward to each release.

Very cool!

Awesome work!

Great video Matt, thank you!

Another great video as always Matt. The pico seems to get more and more love everyday imo.

Pico is so inexpensive that I just keep 3-4 extras on hand for random projects now.

that's a cool thing, I always did that manually by poking with my O-scope and trying to use intuition to find the ports.

i was going to warn everyone in the comments about 5v intolerance but i didnt need to! great video!

This is really cool, thanks for sharing!

Thanks, Matt! I've been looking for that UF2 file for weeks and couldn't find it on GitHub 😅. I ended up buying a J-Link and USB Blaster, but they don't have auto pinout search for JTAG. It would be great to continue with JTAG and EJTAG on MIPS routers, as well as boundary scan, and to understand more about glitch hacking and EMFI attacks.Greetings from Argentina!

Is there a tool that would help determine communication protocols that doesn't involve and oscilloscope?

This guy, deep knowledge. Amirite?!

"I'm running Arch Linux. I do not ... smirk ... automatically mount flash drives to my system."

Haha yeah we know ❤️.

Still haven't got around to getting a pico so sadly I'm gonna have to stick to my pi 4 and piscope :(

Help! I'm trying to get a serial console on an old motherboard using a CP2102 USB to TTL/UART dongle. I'm getting nothing but gibberish in picocom using any of the normal speeds starting of course with the one that is configured by the linux image I'm booting from and tried with flow control on and off. I have the TTL leads connected to the COM port header, pins 2, 3 and 5 for RX, TX and Gnd connecting to TX, RX and Gnd on the dongle. This setup works to give me console on my Raspberry Pis so is there something fundamentally different about the PC UART that's not accounted for here?
The linux image I'm booting from pops up a good serial console when booted in a VM with the COM port connected to a Unix socket so I doubt it's my software setup.
I've googled my fingers down to the knuckle and can't find anything relevant nor any reason why this shouldn't work so if anyone has any insights I'd be very grateful to hear them.

Pretty interesting tool. Would love to also see the other one just to see how it compares.

Love the video! What do you think of Waveahare’s USB To UART/IC2/SPI/JTAG converter? It seems like it could be a good versatile tool. I’ve used. Lot of Waveshare’s stuff for raspberry pi, but can’t find any real world info or reviews on that particular device.

In your example, you showed how to enumerate swd pins. I assume the exact same step can be done for enumerating jtag pins as well in an unknown board correct? Fyi, ive never used jtagulator before.

So clear ! Thanks for the demo :)

hello I tested jtagulator it didn't find swd but blue tag found it ; - ), -> I'm impressed

Thanks so much for posting this video, a big help getting my Pico up and running

Amazing video, having XIAO RP2040 laying around this should work too.

Did you test if it can communicate with the JTAG port of your STM32?

I accidentally broke my precious jtag, i searched online for the same but unfortunately i can find em. I found your video helpful, But I'm not sure if i shoud try this, I'd try this if i get another video😊