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How to Implement AD9236 on Petalinux, ZYNQ

Now, I am planning Implementation of AD9236(ADC) on the ZYNQ Custom board.

OS on the Board is Petalinux.

Firstly, I make signal (1Mhz) PS and then connect it to ADC. Then I added IP-Core(AXI-GPIO) with 12bits as GPIO-Width. But when I checked on the petalinux /sys/class/gpio/gpioxxx/value, the value is wrong i think. it is inter-changed from 0 to 1 only.

How can I get parallel bits data?