Re: I2C interface problem with OmniVision OV7670

[Darius <augulis.darius@xxxxxxxxx>]

btw, I got confirmation from OmniVision - OV7670 does not support 
multiple I2C commands.


> Hi,
>
> OV7670 does not support repeated start.
> When sending several messages (read or write) in one transaction, 
> repeated start is not accepted by OV7670. OV7670 thinks, that it is next 
> clock pulse, not repeated start and second message is not acknowledged.
> It is known bug of OV7670 or my i2c adapter driver works not correct?
> When sending one byte, everything is ok.
> It is interesting, how works OV7670 driver, written by Jonathan Corbet?
> Because there are used i2c_smbus_write_byte_data() and 
> i2c_smbus_read_byte_data() functions, which means, that in one 
> transaction two messages are sent - register address (write) and read data.
> For me this does not work, only register address is acknowledged by 
> OV7670, and second message (read data) fails.
>
> I want to know, is there possibility to use multi-message transactions 
> or not?
>
> BR,
> Darius

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