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AD5940/AD5941 debug

Hello, I would like to ask about the AD5940 ported to other microcontrollers, I have the following questions:

1、I can only do in the debugging process, the microcontroller can send data normally, but can not read back the data of the AD5940 chip, Why does this happen?AD5940 and NRF52840 microcontroller is compatible with it ? 

2、Does the AD5940 require some special configuration before SPI read/write, and what are the specific steps?.

3、Is the code on the official website all correct and working

4、If I want to port the AD5940 separately to my microcontroller as part of it, how should I do it specifically?