Regarding the I2C error

Regarding the I2C error

[balaji narayanam]

  
Hi,

I am trying to interface the OV7620 cmos Image sensor to the Expansion connector C pins of the OMAP5912 OSK.

FOR THAT WE DESIGNED A SIMPLE PCB to connect the Expansion Connector C of OSK5912 TO OV720 SENSOR.

While Building the Linux kernel image in the make menuconfig I had chosen the OVCAMCHIP as module in Linux/drivers/media/video/ovcamchip"
which contain the ov7620 kernel space driver module.
Even I selected the I2C in the menu configuration.
I verified that the camera  is receiving the necessary voltages.

But in the U-boot log we are not getting any OV7620 chip detected message. I am not getting any response at the i2c node in /dev/i2c-0 of OSK5912. 
when I give  # cat /dev/i2c-0
I am getting the following error

i2c_omap i2c_omap.1: timeout waiting for bus ready
cat: Read error: Connection timed out.

Please clarify

Balaji.N

Re: Regarding the I2C error

[Nishanth Menon]

balaji narayanam stated on 7/31/2007 9:26 AM:
>   
> But in the U-boot log we are not getting any OV7620 chip detected message. I am not getting any response at the i2c node in /dev/i2c-0 of OSK5912. 
> when I give  # cat /dev/i2c-0
> I am getting the following error
>
> i2c_omap i2c_omap.1: timeout waiting for bus ready
> cat: Read error: Connection timed out.
>   

Usually camera sensors need a power up sequence and clock before they
start responding on i2c.. am not sure of ov sensors.. micron does at
least... so u'd need to know the datasheet of the sensor to be sure at
what stage u can start communicating with the sensor in i2c. I usually
would do it in kernel as lots more things would be functional there..

Regards,
NM