visual mountain
Hello! I am looking to get ZMK working on Nuinui's #34 PCB. I've been using the module in Pete's github: https://github.com/petejohanson/niuniu-zmk-module and have also tried with JLW's that Pete forked: https://github.com/josh-l-wang/zmk-jlw-keyboards.
I'm pretty new to ZMK and I haven't set up a new board with it yet, so there is likely a lot for me to learn and I'm hoping this won't be too difficult 🤞 CC: @uneven hazel since we talked about it in 40s
Oh, and not sure if its helpful, but here is the source to the Vial QMK firmware: https://github.com/PhoxFyre/niuniu-keyboards-source/tree/main/Source/gb34_%2334r2
uneven hazel
So... that source is likely GPL so not ideal to reference.
Let me see if that repo I made was in fact based on latest from nuinui, I'll check out backlog
So.. bad news, those were all written for the R1 #34
visual mountain
Aaahhh that makes sense!
uneven hazel
I thought maybe, I had just confirmed that they design was planned for nRF52
visual mountain
I appreciate it, Pete!
visual mountain
Grit in abundance ~ no on the multimeter...
But I can get one and do some leg work if I learn what's up!
uneven hazel
High res pics of both sides of the PCB would be a good start.
I assume we'll find a similar design with shift registers.
I can also ping nuinui to see if they're willing to send schematics. Will do so now.
visual mountain
Hi Res PCB photos
uneven hazel
Yup, shift registers as expected.
How about close up of the MCU?
Also, if you put it into the bootloader, can you get the content of the INFO.TXT that shows up on the mass storage device?
visual mountain
uneven hazel
So... that looks very similar, hardware wise
Realy question will be what, if any, matrix or pin uses they changed.
visual mountain
uneven hazel
Yeah, ok, so same-ish bootloader, at least.
niuniu is going to ask the PCB designer for details
visual mountain
Can't thank you enough, Pete!
Hoping to learn more and more, and then be able to help eventually 
baby steps
uneven hazel
Sent a follow up nudge to niuniu
If that doesn't get us anywhere, I can walk you through steps to use a multimeter to probe things.
visual mountain
Sweet! Thank you!
uneven hazel
I want to see this thing running ZMK, and live vicariously since I didn't pull the trigger on one.
uneven hazel
Got some details. Will compare with firmware for the r1 #34 and see where to go from here
nova whale
My PCB no longer enumerates over USB so I can't test this unless/until I diagnose, but: The FFC was misaligned, shorting USB D+ and D- 
https://github.com/lesshonor/stewardship-zmk-module/commit/08ace8143b60a9b6b2b91b4d0aef42f1e00f4ff9
Instructions: https://github.com/lesshonor/stewardship-zmk-module?tab=readme-ov-file#instructions
uneven hazel
~~My PCB no longer enumerates over USB so I can't test this unless/until I diagn...
Oof. Bootloader corrupted maybe?
nova whale
To assuage any fears, this happened before I had the chance to try flashing anything so it's unrelated to the board definition I wrote.
Maybe something went wrong with the preflashed Vial/QMK jank, maybe I poked the wrong bits with the multimeter...at some point I'll try getting a debugger hooked up to it.
