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ov7690 SCCB writing data to register

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hassanmd

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Hello:
i am using ov7690 with at91sam usin MCK at 12.3MHz. but for testing purpose i am using I2C at 153KHz from atmega2560 for SCCB. I can read anyregister from ov7690 but I can't write to any register. the response iscorrect i.e. status register of TWI of atmega2560 depicts correcr value,meaning it sends data.

but when i read back the value from that register the old valureretains...

what can be the problem??
 

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