stepper L6470

Hi folks, I've got my stepper motor all set up but it is not running. could you please give me an idea what might be wrong? im running a 3.2V/2.8A 200steps/rev bipolar stepper motor using L6470 stepper drive and an arduino uno. when i run the L6470 example sketch the motor is still . you can feel a one single beat/skip inside the motor. but that is it. Im using a 12V/5A power supply. (my connections are D13-CK,D12-SDO,D11-SDI,D10-CSN,D6-STBY,D4-BSYN,GND-GND) Thank you