DRV8889-Q1EVM: SPI Comunication with Stepper Motor

Part Number: DRV8889-Q1EVM

Hello,

I have DRV8889-Q1EVM and operate Bipolar Stepper motor through SPI Protocol.

NOTE:- I am operating DRV8889 of EVM through external MCU instead of on-board MCU(MSP430).

I have some queries to operate Motor by SPI.

Q-1 In CTRL3, bit 7 is for DIR and description says "Direction input. Logic '1' sets the direction of stepping, when SPI_DIR = 1".

        So here which direction (clock or Anti-clock) is indicated by this bit?

Q-2  I need the full detailed description to configure registers using SPI as the datasheet has not enough information.

Q-3  Do we have to wait for transaction completion after sending first 8 bits?

Q-4  After power-on the EVM, when I read the CTRL3 register through SPI, received the bit set for the SPI_DIR & SPI_STEP. So Is it correct or Is there any error in reading register?

                 (Here I am sending the 16 bits at a time). 

Regards,

Alpesh