Now I have finished the point to point soldering of the SPI part of the MCP23s17 - power, SPi, address decoding. I have left the IO, interrupt, and reset connection after I have made sure that the RPi can detect this SPI device.
I will first take the SPI cable with MOSI and MISO loop back, to make sure everything is OK. Then I will connect the SPI cable to the real thing MCP2S17, to see if it can be detected.
.END
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