SPI device addressing

Projects Networking, Protocols, and Devices
4

(Thinking out loud, disclaimer, never did this myself)

You could cross-breed SPI and I2C. I2C allows addressing up to 100+ slaves.

  1. set one slave as the active one. The Arduino sets its own CS pin HIGH after the appropriate I2C request.

  2. send 'big' data with high speed over SPI back and forth

  3. deselect slave. The Arduino sets its own CS pin LOW after the appropriate I2C request (or time out !)

  4. go to 1 :wink:

should work, but it depends on your timing requirements