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DRV8301-69M-KIT: DRV8301 SPI communication problem

Part Number: DRV8301-69M-KIT
Other Parts Discussed in Thread: DRV8301, MOTORWARE

Hi, all, 

My hardware is DRV8301-69M-KIT, and I would like to modified OP gain of current sensing via SPI communication.

I try to read the register of drv8301 first, but I can't establish the communication.

I try to read "control register 1", and send a command, 0x9800, to drv8301. However, it do not have any response.

I have checked following:

SPI_VDD is 3.3V

EN_GATE is set to high, or low. 

Swap SDO and SDI.

PVDD is 24V.

Change SPI clock from 1MHz to 10MHhz. 

However, I still can't resolve. Has anyone can advise me?

The signal from top to button are CS, Clock, SDI(MCU to DRV), SDO(DRV to MCU)