If you have a SPI bus with only one device can you connect chip select to ground?
I'm new to electronics, tinkering with a custom split keyboard design. I have a micro controller in the one half and a MCP23S17 IO expanded in the other. I have a five strand cable to connect the two. I think I need MOSI, MISO, SCK, Ground and 5v+. Do I need a dedicated chip select, or can I connect chip select to ground (pulled low?) if the only spi device on the spi bus in the IO expander?