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CS 1 o o 8 5V SCLK 2 o o 7 B MIMO 3 o o 6 Wiper GND 4 o o 5 A
Commands are 8 or 16 bits. After the first 6 bits the MCP4131 starts driving MIMO as an output.
I've just connected the Pi's MOSI gpio to MIMO. This works and lets me output commands to the device but I was wondering if this was safe.