2011-08-02 03:09:48 Can't get image from a USB-Webcam

Christian Klingen (GERMANY)

Message: 102762

Hi,

I am working with the DEV-BF548DA-Lite board and the 2010R1-RC5 distribution.

I try to get a picture from a USB-Webcam but it doesn´t work. I only get the error can´t get image.

I use the Hercules Classic Silver webcam. I connected the cam via USB. I set the settings for uclinux ditribution from this site docs.blackfin.uclinux.org/doku.php?id=linux-kernel:drivers:usb_video_device_class&s[]=v4l

To get an image I used the prog vidcat from the distibution. But when I enter the command root:/> vidcat -d /dev/video0 I only get the Error message “Error: Can't get image“.

I think the driver is loaded correctly.

Board Memory: 64MB

Kernel Managed Memory: 64MB

Memory map:

fixedcode = 0x00000400-0x00000490

text = 0x00001000-0x0017a9a0

rodata = 0x0017a9a0-0x002021bc

bss = 0x00203000-0x002160f4

data = 0x002160f4-0x0023c000

stack = 0x0023a000-0x0023c000

init = 0x0023c000-0x00934000

available = 0x00934000-0x03f00000

DMA Zone = 0x03f00000-0x04000000

Hardware Trace Active and Enabled

Boot Mode: 1

Compiled for ADSP-BF548 Rev any, running on 0.1

Blackfin Linux support by blackfin.uclinux.org/

Processor Speed: 525 MHz core clock and 131 MHz System Clock

usb 1-1: new high speed USB device using musb_hdrc and address 2

usb 1-1: New USB device found, idVendor=06f8, idProduct=300c

usb 1-1: New USB device strings: Mfr=2, Product=1, SerialNumber=0

usb 1-1: Product: Classic Silver

usb 1-1: Manufacturer: Guillemot Corporation

uvcvideo: Found UVC 1.00 device Classic Silver (06f8:300c)

input: Classic Silver as /devices/platform/musb_hdrc.0/usb1/1-1/1-1:1.0/input/input0

root:/> lsusb

Bus 001 Device 002: ID 06f8:300c Guillemot Corp.

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

root:/> vidcat -d /dev/video0 -v

input palette: rgb

size: 320x240

using read()

Error: Can't get image

root:/>

root:/> luvcview -f yuv -s 320x240 -i 30

luvcview 0.2.4

Couldn't initialize SDL: No available video device

Is there anybody who knows how I can do this?

Is there any example schematic?

Thanks a lot

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2011-08-02 04:54:50 Re: Can't get image from a USB-Webcam

Aaron Wu (CHINA)

Message: 102782

Could you check if your device driver is proerly installed and probed. Is the /dev/video0 present there?

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2011-08-02 09:35:32 Re: Can't get image from a USB-Webcam

Christian Klingen (GERMANY)

Message: 102786

I think yes

root:/> lsusb

Bus 001 Device 002: ID 06f8:300c Guillemot Corp.

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

root:/> modprobe videodev

Linux video capture interface: v2.00

root:/> modprobe uvcvideo

uvcvideo: Found UVC 1.00 device Classic Silver (06f8:300c)

input: Classic Silver as /devices/platform/musb_hdrc.0/usb1/1-1/1-1:1.0/input/input0

usbcore: registered new interface driver uvcvideo

USB Video Class driver (v0.1.0)

root:/> vidcat -v -d /dev/video0