How to change resolution of camera(ov5640)?

[hanseunglee]

Hello .

My configure below.

kernel 3.0.35

os ubuntu 12.04

board i.mx6dl sabresd

I use ov5640 camera.

This camera set resolution are

	ov5640_mode_VGA_640_480 = 0,
	ov5640_mode_QVGA_320_240 = 1,
	ov5640_mode_NTSC_720_480 = 2,
	ov5640_mode_PAL_720_576 = 3,
	ov5640_mode_720P_1280_720 = 4,
	ov5640_mode_1080P_1920_1080 = 5,
	ov5640_mode_QSXGA_2592_1944 = 6,
	ov5640_mode_QCIF_176_144 = 7,
	ov5640_mode_XGA_1024_768 = 8,

.

If when i want to using ov5640 device driver, how to change resolution ?

Do you have a manual or solution?

I think , i need to change sensor clock and device driver code...

what files modify for change clock and resolution?

[ramyaravichandr]

Hi Hanseung,

V4L2 drivers do provide API for the same.

Also, if you have access to the driver,you can do it.

Thanks,

Ramya

www.blackpeppertech.com

[jimmychan]

You can use gstreamer to test your camera, here is the example:

gst-launch mfw_v4lsrc capture-mode=8 device=/dev/video1 fps-n=30 !mfw_v4lsink

-- you can change the capture-mode to test different resolution and change the fps-n for different frame rate.

[hanseunglee]

Hi! jummychan.

IMX6SDLRM document is explain below.

For parallel interface, the maximum speed of the interface is 240Mhz. The required

operating frequency of the interface is calculated in the following way:

F = FH * FW * FPS * BI * DF

Where

• FH = frame height (in pixels)

• FW = Frame width (in pixels)

• fps = frame rate (frames per second)

• BI = typically 35% overhead, should be assumed as 1.35. The actual blanking

intervals are a parameter of the attached device.

• DF = data format, defines the number of cycles needed to send a single pixel.

The number of cycles needed to send a single pixel depends on the interface and the data

format.

Data format examples:

• YUV422 over 16 bit = 1 cycles/pixel

• RGB888 over 8 bit = 3 cycles/pixel

• RGB565 over 16 bit = 1 cycles/pixel

• Bayer/Generic data = 1 cycle/pixel

• YUV422 over 8 bit = 2 cycles/pixel

• BT.656, YUV422 format = 2 cycles/pixel

• BT.1120, YUV422 format = 1 cycle/pixel

Examples of supported interfaces:

• 3.2MP camera, 15fps, yuv422 format, 8 bit interface

• 1080P30, yuv422, 8 bit interface

So, Can i change clock for resolution. How to change clock in linux ov5640 source(ov5640.c or mxc_v4l2_capture.c..etc..)?

[jimmychan]

The answer is no.