Software Controlled Current on external drivers

Hi,

at the moment I am searching a way to keep the software controlled stepper current when switching to external stepper drivers. I want to use the SilentStepStick TMC2100 from Watterott. These support the software controlled current by using the additional pins on the driver board. But so far I haven´t found any tutorial or so how to do this. Can somebody help me?

Imported from wikidot