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joric / nrfmicro

A Pro Micro alternative for wireless keyboards
https://github.com/joric/nrfmicro/wiki
The Unlicense
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How to check soldering for older versions? #68

Closed ntrp closed 1 year ago

ntrp commented 1 year ago

Hello, thanks for this amazing project! I am having some issues with my board, probably due to bad soldering..

I have seen the https://github.com/joric/nrfmicro/wiki/Soldering#testing article but I have currently a older version (I think 0.03) which I built just now after ordering the pcbs some time ago. I tried the Diode testing mode between GND and any other pads but nothing happens, only activates when I touch the probes together.

Also I am using BMP over a BluePill and I can see this in the output after a swdp_scan:

(gdb) mon swdp_scan
Target voltage: unknown
Available Targets:
No. Att Driver
 1      Nordic nRF52 Access Port

Which looks wrong because I have seen other screenshots showing also a line saying Nordic nRF52 M3/M4 and not only access port. Does that mean that my chip is badly soldered?

joric commented 1 year ago

Tester should be set to diode mode not continuity mode. You measure voltage drop, not resistance. GND goes to RED (positive) terminal, BLACK terminal goes to a pin.

As for access port it means your device may be locked. See unlock instructions and console log here https://github.com/joric/nrfmicro/wiki/Bootloader#blackmagic

ntrp commented 1 year ago

Ok sorry.. stupid me, I switched the multimeter wheel to the right position but did not activate diode mode.. Also I was using the second pin, instead of the 3rd for GND, should doublecheck better next time..

I was trying to unlock using a BMP connected to SWC/SWD but when running the unlock code I was getting timeouts.

What about the bottom pins? How should I verify they are in order? If all gpio pins have 0,7 vdrop they are ok?

p.s. I found 2 GPIO pins which are not connected so now I need to figure out which connection needs a touch up..