After ordering a board panel, I’ll whip together a tester shield. This will go on a Metro M0 (SAMD21) running our stand-alone UPDI programming code. The mounting holes on the breakout become the tester jig alignment holes thanks to some standoffs. Then we just have oval pads for securely soldering the pogo pins. Note the p-channel FET on the VIN pin, we use that to power cycle the board when testing the address pins since they’re sampled on boot only.
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