Hello everybody,
I want to use a USB WebCam in a 846 system (Prometheus board from
diamondsystems). The WebCams that I am looking at are the ones
supported by the ov511 driver, and the IBM C-it WebCam. I am able to read
frames from the IBM WebCam, but I haven't been succesful with webcams
supported by the ov511 driver in my 486 computer.
I read in this Mailing List that a 486 computer is too slow to
handle usb devices and the processing necessary for video frames. Is
there a way to get frames, even if I get 1 frame every 5 seconds, from a
USB WebCam in a 486 system? Or is there a way for the USB system to work
with a 486 processor? Are there some delays in the USB device driver that
don't allow a slow 486 processor to work properly?
I am using a very simple application with VIDIOCMCAPTURE, and
VIDIOCSYNC ioctl calls to read frames from the USB WebCam.
When I try to read a frame I get these messages in
/var/log/messages:
###################################################################
Feb 13 08:49:14 localhost kernel: usb.c: USB disconnect on device 10
Feb 13 08:49:16 localhost kernel: hub.c: Cannot enable port 1 of hub 1,
disabling port.
Feb 13 08:49:16 localhost kernel: hub.c: Maybe the USB cable is bad?
Feb 13 08:49:16 localhost kernel: hub.c: USB new device connect on bus1/1,
assigned device number 11
Feb 13 08:49:16 localhost kernel: ov511.c: USB OV511+ camera found
Feb 13 08:49:16 localhost kernel: ov511.c: model: Generic OV511 Camera (no
ID)
Feb 13 08:49:16 localhost kernel: ov511.c: i2c write retries exhausted
Feb 13 08:49:16 localhost kernel: ov511.c: i2c write: error -1
Feb 13 08:49:16 localhost kernel: ov511.c: Sensor is an OV6620
###################################################################
Why does the USB system disconnect the device? I tested the
WebCams in a Pentium II 400MHz system and I am able to read frames without
any problem. I am using my own application to read frames in the 486
system and the Pentium II 400MHz system. So I don't think that the USB
cable is bad.
Is there a way to "search" the Mailing List Archives? I couldn't
find a way to do it.
Thank you for your help.
Jose Guilberto
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