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Help with camera OV7670

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Hello. I would appreciate some help here.
I have recently acquired a camera OV7670 and I am trying to use it with a STM32 nucleo using mbed.(But that is not really relevant, so if you are not familiar with mbed, just keep reading please).
Anyway, I have tried to get some image but all I get is this:
I am wondering what could be the problem?
I am now going to check the initialization of the camera (which seems very tricky)
but I am suspecting perhaps some clock initialization is not being done right?
Anyway, any help , comment or advice will be greatly appreciated.

(in a next post I am going to post about how I am connecting the camera to the microprocessor)
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