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Eval AD7156 integrating with arduino uno

Here i am trying to comm with I2C through SDA and SCL of Arduino uno board.

its starting stage im not able to read the data in register of ad7156

its showing FF for all reg.

hardware connection in correct and logical level converter connected between both boards.

here i attached the my code and verify help to resolve this issue.

what is address of I2C in ad7156?

For write?

for read?