2009-08-25 10:13:14 /dev/video0

Steven Sheppard (UNITED STATES)

Message: 79194

I'm trying to get the OV9655 camera (Surveyor Camera) to work with my Bluetechnix CM-BF537E Board. I followed all of the instructions on this page:

docs.blackfin.uclinux.org/doku.php?id=linux-kernel:drivers:v4l_blackfin_camera

But I can't get /dev/video0 to show up.

root:/> modprobe i2c-bfin-twi

i2c-bfin-twi i2c-bfin-twi.0: Blackfin BF5xx on-chip I2C TWI Contoller Driver, Ve

rsion 1.8, regs_base@ffc01400

root:/> modprobe blackfin-cam

Linux video capture interface: v2.00

OV9655: detecting client on address 0x60

OV9655: V4L driver Blackfin CMOS Camera now ready

OV9655: i2c driver ready

root:/> cd dev/

root:/dev> ls

console gpio18 gpio29 gpio4 gpio8 ram10 ram8

full gpio19 gpio3 gpio40 gpio9 ram11 ram9

gpio0 gpio2 gpio30 gpio41 kmem ram12 random

gpio1 gpio20 gpio31 gpio42 kmsg ram13 root

gpio10 gpio21 gpio32 gpio43 mem ram14 sport0

gpio11 gpio22 gpio33 gpio44 mtd0 ram15 sport1

gpio12 gpio23 gpio34 gpio45 mtd0ro ram2 tty

gpio13 gpio24 gpio35 gpio46 mtdblock0 ram3 ttyBF0

gpio14 gpio25 gpio36 gpio47 null ram4 ttyBF1

gpio15 gpio26 gpio37 gpio5 pts ram5 urandom

gpio16 gpio27 gpio38 gpio6 ram0 ram6 zero

gpio17 gpio28 gpio39 gpio7 ram1 ram7

root:/dev>

Any help or advice would be greatly appreciated. As I've posted before: I'm very new to this, so please talk down to me.

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2009-08-25 10:16:29 Re: /dev/video0

Steven Sheppard (UNITED STATES)

Message: 79196

BTW, I'm using dist 2008R1.5-RC3

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2009-08-25 10:21:45 Re: /dev/video0

Steven Sheppard (UNITED STATES)

Message: 79197

OK. I got the video0 to appear using the command:

mknod /dev/video0 c 81 0

I found that on a forum post, and I'm not sure what the "c 81 0" stand for. However, I don't seem to be able to open it.

root:/dev> v4l_test

usage: video_cap [-r <frame_rate>] [-o <output file>]using default setting: coul

dn't allocate bottom buffer - kernel start address too low

capture rate: 30, height: 288, widht: 352

open /dev/video0

cannot open /dev/video0

root:/dev>

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2009-08-25 10:26:10 Re: /dev/video0

Mike Frysinger (UNITED STATES)

Message: 79199

please search the forums. people have already debugged this camera module and found the I2C vs SCCB to be problematic.

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2009-08-25 10:56:05 Re: /dev/video0

Steven Sheppard (UNITED STATES)

Message: 79202

I read throught some of that, and this doesn't seem to be the problem. When I run the camera driver it seems to work perfectly. In fact, on the SVR1 board, I could just run v4l_test and it went and captured. After my last try I went and set the kernel start address to 0x400000, which is the SVR1 default. The V4L setup page said to use 0x100000.

Now the /dev/video0 opens, but I'm getting an error.

root:/dev> v4l_test

usage: video_cap [-r <frame_rate>] [-o <output file>]using default setting

capture rate: 30, height: 288, widht: 352

open /dev/video0

found Blackfin CMOS Camera device. (maxsize=1280x1024)

default picture properties: brightness=27714,hue=25441,colour=26219,contrast=282

65,depth=16, palette=9.

could not set picture properties: Invalid argument

unsupported video pixel format.

root:/dev>

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