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MSP-EXP430G2: Cannot read the data of DRV8711 on BOOST-DRV8711

Kaka
Guru 24520 points

Part Number: MSP-EXP430G2

Hi TI Experts,

We met the following issue now.
When I evaluated the BOOST-DRV8711 with MSP-EXP430G2 and default source code and GUI which TI provided on Web site, the GUI could not read the read the data of DRV8711. Then I checked the waveform of SPI data line, the MISO(SDATAO) data line was about 2.0V even thought other line was 3.3V. Please check the attached the waveform.

CH1: CLK(SCLK)
CH2: MISO(SDATAO)
CH3: MOSI(SDATI)
CH4: SCS

Would you please teach me the reason why this phenomenon was occurred?
Best regards.
Kaka