For some weeks now we are working on our TRAMS 3D-printer shield – TRAMS is a derivative of the popolar RAMPS shield for Arduino Mega Boards.
TRAMS is based on 4 TMC5130 cDriver – a Stepper motor driver with integrated ramp controller, so it offloads the AVR and reduces interrupt load to 10% of the original load.
TMC5130 comes with the same stealthChop™ feature we introduced in out TMC2100 and TMC2130, that is already known from the silentStepStick and makes the fans and mechanics the loudes part at the printer.
The firmware is integrated in the popular Marlin software and controlled by repetier host and will of course be open source as the hardware design will be.