iMX6q ov5640 not clear

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iMX6q ov5640 not clear

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zhongjiansun
Contributor I

Hello, I'm trying to use mipi camera OV5640 on my custom design board, but I found the picture is not clear. The camera focus has been adjusted, and camera has been set to 1920*1080@30fps, and the picture still cannot show the word on the paper clearly, like the image shows below.

WeChat Image_20180418105505.png

My PCB layout set clock and 2 mipi lane impedence to 100ohm , and  the line length difference is not more than 30mil. Their reference plane is GND plane.

Is this the hardware(layout or SI) problem, or the camera is not good enough, or the i.MX6q driver problem?

My version info below.

Thanks in advance.

 

Zhongjian

my version info

 

Product Info: i.MX6Q

BSP: imx-3.14.52-1.1.0_ga

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igorpadykov
NXP Employee
NXP Employee

Hi Zhongjian

one can try to tweak contrast sensor settings in driver:

linux/ov5640.c at master · torvalds/linux · GitHub 

To check if issue is caused by hardware one can try to decrease fps,

this may reduce overall board noise.

Best regards
igor
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