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Check wiring, pin configuration and clock configuration.Always read a register first, modify the desired bits and then write it back to the OV7670.reading the 0x01 register should return 0x80. For debugging purposes, try reading some registers and check that they contain their default values.The 7 bit SCCB/I2C address is 0x21, this translates to 0x42 for write address and 0x43 for read address.Make sure the SCCB is working properly, the OV7670 will answer with an ACK, after it has been address properly.Now you can use qSerialTerm to visualize images streamed through the Serial Port.
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