You cant
It needs the hardware SPI port lines SCK,MOSI and MISO which is on aux3
In theory you could setup software SPI on any pins, but in reality it is far to slow and would use to many cpu cycles and thus it would cripple the ramps.
You can use any IO line as the CS... but that doesn't really help.
Edited 1 time(s). Last edit at 06/11/2018 07:46PM by Dust.