From: Darius <augulis.darius@gmail.com>
To: video4linux-list@redhat.com
Subject: Re: I2C interface problem with OmniVision OV7670
Date: Wed, 14 May 2008 21:37:54 +0300 [thread overview]
Message-ID: <g0fbi6$ule$1@ger.gmane.org> (raw)
In-Reply-To: <482AD0B8.5050202@gmail.com>
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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prev parent reply other threads:[~2008-05-14 18:38 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-14 11:44 I2C interface problem with OmniVision OV7670 Darius
2008-05-14 18:37 ` Darius [this message]
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