i.MX ProcessorsのトピックRe: v4l2 capture

v4l2 capture

MatthiasFend — Wed, 06 Apr 2011 10:14:53 GMT

hi,

I just tried to get the CSI interface of the 53QSB to work:

First I load the modules:

> modprobe mxc_v4l2_capture

> modprobe ov3640_camera

But when I try to access these driver with the supplied test utilities

(mxc_v4l2_overlay.out, mxc_v4l2_capture.out) I always get error messages like these:

ERROR: v4l2 capture: slave not found!
Unable to open /dev/video0

I figured out that the probe method of the ov3640 is also not called (after modprobe).

For the test I used L2.6.35_11.01.00_ER.

When I use the same kernel&rootfs with the IMX51EVK everything works well.

So I guess it's something board/processor specific.

Any hints?

Thanks,

Matthias

Re: v4l2 capture

MatthiasFend — Wed, 06 Apr 2011 12:12:32 GMT

arggh. evk,qsb,loco, ... caught by the "naming" trap.

mx53_loco is the place to be (not mx53_evk).

thanks,

~matthias

Re: v4l2 capture

shricco — Thu, 06 Oct 2011 12:58:14 GMT

Hi Matthias,

I am facing the same problem with the unable to open /dev/video0.

What exactly have you done to get it working? I tried running the unit tests on the ubuntu 10.04 shipped with my i.mx53 QSB.

Thx in advance

Chris

Matthias Fend said:

arggh. evk,qsb,loco, ... caught by the "naming" trap.
mx53_loco is the place to be (not mx53_evk).

thanks,
~matthias

Re: v4l2 capture

DualDisplayiss1 — Sat, 29 Oct 2011 15:16:10 GMT

Hi~~Matthias:

i also meet this problem when i change ov3640 to adv7180.

what do you mean >caught by the "naming" trap.

can you describe more.

thanks

Eric

shricco said:

Hi Matthias,
I am facing the same problem with the unable to open /dev/video0.

What exactly have you done to get it working? I tried running the unit tests on the ubuntu 10.04 shipped with my i.mx53 QSB.

Thx in advance

Chris

Matthias Fend said:
arggh. evk,qsb,loco, ... caught by the "naming" trap.
mx53_loco is the place to be (not mx53_evk).

thanks,
~matthias

Re: v4l2 capture

MatthiasFend — Thu, 16 Feb 2012 16:15:25 GMT

sorry for the late reply - probaply i missed some notifiers...

i was editing mx53_evk board file, but of course the mx53_loco is the file which is used on the QSB.

so i changed something and, of course, nothing happend...

~matthias