I'm trying i2c bus on BBB 

slave module is OV7670 ( CMOS Camera )

OS is angstrom 


<https://lh3.googleusercontent.com/-zT9VFvtWOmo/VYpkZj8P2MI/AAAAAAAAFDw/Abor6TYsMrg/s1600/dd.png>


when i connect ov7670 on BBB  P9 Header (19,20) 

and command i2cdetect -r -y 1 

look at the picture above you fine '21' is creating 

0x21 is slave address ???? 

but slave address of ov7670 is 0x42 in datasheet 

what means 0x21 ?? 

and 

am i better try i2c ??? 



My purpose is writing data to the ov7670 register.


Advice please

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