- Would it be possible to get the drawings of that in-between PCB ? - I'd like to take a look - I "suspect" it does the shielding between the 880 and the MCU.
- Also using shielded, mono microphone-style cables for connecting the 880 to the Pi (signal cables CLK, MISO, MOSI, NSS and RESET) should help (gut-feeling). This means soldering pins ... can be a bit tedious. Shields go to the signal GND (not power GND) on the Pi side and are left unconnected at the 880 end.
- SSTP Cat6a Cables can also be used. 2 cables are necessary (because each cable has 4 pairs of wires shielded by pair, and we will use only ONE wire in each pair - see this image). One cable will carry CLK, MISO, MOSI and NSS, for example, and the other RESET and 3 left unused. Again, shields and ALL unused core wires go to the GND on the Pi side and left unconnected on the 880 side.
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[IMST IC880A + RPi] Gateway "hangs" every few weeks
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