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Old 08 December 2019, 22:59   #29
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Join Date: Jul 2019
Location: Linköping
Posts: 32
Finally solved it! It was a trace going from VCC to the _RST pull-up resistor that was broken. I had measured resistance between the VCC-pad of the pull-up and _RST, which gave the expected value. Had I measured between _RST and VCC (somewhere else on the board) I would have caught it earlier.

The trace also fed two other pull-ups , _IPL_0 and _IPL_1, so that's why the IRQ didn't work.

The board is now fully functional.

Thanks for all the help, especially the nice boot sequence overview from solarmon.
hadoque is offline  
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