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TDA3XEVM: can not read 964 device adress through I2C interface

Part Number: TDA3XEVM

Hi, My question is as follows:

Products: TDA3x

SDK version: PROCESSOR_SDK_VISION_03_02_00_00

Usage Scenario: Camera Ov9284 - TI913 -  Ti964 - TDA3x controller

when i read  964 device adress through I2C interface, The IC address of 964 is  0x32 ,register adress 0xf5 but fail. return value -21 .i use function as pictures 

  • What causes this?Why access failed? thank u very much