Re: [Gumstix-users] Selecting a Microprocessor

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I use the Video4Linux API. I'm writing the program that will use the webcam
from scratch so I use function-calls directly to the v4l API like
grab_one(width,height) etc., but most linux-programs that use webcams use
v4l so this is really the way to go anyway. Let's also install both the
quickcam-messenger driver and the pwc driver. There's several posts about
this already, but I'll save you the trouble. This is for OpenEmbedded on the
Verdex.

I assume you've got past the point in the Quick Start
guide<http://www.gumstix.net/Software/view/Getting-started/Quick-start/111.html>where
you do
bitbake gumstix-basic-image

Assuming you checked out the svn to ~/gumstix/gumstix-oe/, now lets make a
custom kernel:
mkdir -p ~/gumstix/gumstix-oe/user.collection/packages/linux
cp -r ~/gumstix/gumstix-oe/com.gumstix.collection/packages/linux/*
~/gumstix/gumstix-oe/user.collection/packages/linux/
cd
~/gumstix/gumstix-oe/tmp/work/gumstix-custom-verdex-angstrom-linux-gnueabi/gumstix-kernel-2.6.21-r1/linux-2.6.21/
make ARCH=arm menuconfig

Configure the kernel like this:
Device Drivers --> USB Support --> Support for host-side USB (<M>)
Device Drivers --> Multimedia Devices --> Video For Linux (<M>)
Device Drivers --> Multimedia Devices --> Video Capture Adapters --> V4L USB
Devices --> Your camera, or simply all cameras (<M>)
Close and save.

cat .config >
~/gumstix/gumstix-oe/user.collection/packages/linux/gumstix-kernel-2.6.21/gumstix-custom-verdex/defconfig
bitbake -c rebuild gumstix-kernel

Install the new kernel (see the Getting
Started<http://www.gumstix.net/Software/view/Getting-started/Quick-start/111.html>guide).
Now you'll need the following files:
kernel-module-compat-ioctl32_2.6.21-r1_gumstix-custom-verdex.ipk
kernel-module-v4l1-compat_2.6.21-r1_gumstix-custom-verdex.ipk
kernel-module-v4l2-common_2.6.21-r1_gumstix-custom-verdex.ipk
kernel-module-videodev_2.6.21-r1_gumstix-custom-verdex.ipk
kernel-module-pwc_2.6.21-r1_gumstix-custom-verdex.ipk
kernel-module-usbvideo_2.6.21-r1_gumstix-custom-verdex.ipk
kernel-module-quickcam-messenger_2.6.21-r1_gumstix-custom-verdex.ipk

They can be found in
~/gumstix/gumstix-oe/tmp/deploy/glibc/ipk/gumstix-custom-verdex/
Transfer them to your verdex in whatever way you fancy. I used a USB memory
stick.
Install them in the following sequence:
ipkg install
kernel-module-compat-ioctl32_2.6.21-r1_gumstix-custom-verdex.ipk
ipkg install kernel-module-v4l1-compat_2.6.21-r1_gumstix-custom-verdex.ipk
ipkg install kernel-module-v4l2-common_2.6.21-r1_gumstix-custom-verdex.ipk
ipkg install kernel-module-videodev_2.6.21-r1_gumstix-custom-verdex.ipk
ipkg install kernel-module-pwc_2.6.21-r1_gumstix-custom-verdex.ipk
ipkg install kernel-module-usbvideo_2.6.21-r1_gumstix-custom-verdex.ipk
ipkg install
kernel-module-quickcam-messenger_2.6.21-r1_gumstix-custom-verdex.ipk

Now you should be good to go. With this setup, when I plug in my webcam, I
get:
root@gumstix-custom-verdex:~$
usb 1-2: new full speed USB device using pxa27x-ohci and address 2
usb 1-2: configuration #1 chosen from 1 choice
Linux video capture interface: v2.00
drivers/media/video/usbvideo/quickcam_messenger.c: Logitech Quickcam
Messenger USB v0.01
videodev: "QCM USB Camera" has no release callback. Please fix your driver
for proper sysfs support, see http://lwn.net/Articles/36850/
drivers/media/video/usbvideo/usbvideo.c: QCM on /dev/video0: canvas=320x240
videosize=320x240
input: QCM button as /class/input/input0
usbcore: registered new interface driver QCM
usbcore: registered new interface driver snd-usb-audio
root@gumstix-custom-verdex:~$ lsusb
Bus 1 Device 2: ID 046d:08f0 Logitech, Inc.
Bus 1 Device 1: ID 0000:0000
root@gumstix-custom-verdex:~$ ls /dev/video*
/dev/video   /dev/video0

Good luck
Jostein A. Jacobsen

2008/12/10 Shao Chong Oh <mir...@ho...>

>  Hi Jostein,
>
> How did you interface your webcam with the Verdex? The driver that comes
> with the webcam normally works only on Windows or Mac, did you write your
> own driver for the webcam? Hope you can reply directly to my email account
> and not to the mailing list as I've just unsubscribed from the list. Thanks
> lots. =)
>
> Regards,
> Shao Chong
>
> ------------------------------
> Date: Sun, 23 Nov 2008 14:21:13 +0100
>
> From: jos...@st...
> To: gum...@li...
> Subject: Re: [Gumstix-users] Selecting a Microprocessor
>
> 2008/11/22 Shao Chong Oh <mir...@ho...>
>
>  Hi Jostein,
>
> Thank you very much for your advice. I'm really new to these things and I
> still have quite a few questions on my mind. In fact this is my first time
> dealing with microprocessors.
>
> 1. May I know if there's already a USB connector on the Verdex motherboard?
> Or do you have to buy another expansion board?
>
>
> There is no USB connector on the motherboard itself, it just has the
> signals capable of USB Host functionality. The easiest way to go would be to
> get an expansion board with USB Host connector. I haven't looked through
> them all to see which ones has got it, but my Console-VX expansion board has
> a USB Host connector. To get a standard Type A connector like the ones on
> normal desktop/laptop computers you will need a USB connector-converter -
> available from gumstix.com as well as many other electronics shops.
>
>
> 2. How do you connect the I/O devices (monitor, keyboard, mouse) to the
> Verdex to work on it? Can I just connect through the I/O pins on the Verdex
> itself? Or is there a need for other components?
>
>
> I don't know about monitor and mouse, but the normal way of connecting to a
> gumstix (without setting up a network) is using USART over RS232 and kermit
> as briefly described here<http://www.gumstix.net/Software/view/Getting-started/Quick-start/111.html>(There is a longer description on some other page, but I can't find it in
> the documentation anymore. It seems they've removed links to everything
> other than Overo and Verdex Pro. This one I had bookmarked).
>
> Hope this helps.
> Regards
> Jostein A. Jacobsen
>
>
>
>
> Regards,
> Shaochong
>
> ------------------------------
> Date: Sun, 9 Nov 2008 17:29:49 +0100
> From: jos...@st...
> To: gum...@li...
> Subject: Re: [Gumstix-users] Selecting a Microprocessor
>
>
> The easiest approach for connecting to a webcam would be to use a
> motherboard with USB Host capabilities. Of the Basix, Connex and Verdex
> boards, Verdex is the only one with USB Host. The Overo motherboard will
> support USB Host, but it's listed as "experimental" and I don't think its
> working quite yet.
>
> I've currently set up my Verdex XL6P to use a webcam through the
> Console-VX, but I'm not sure what expansion boards you would use to get both
> USB Host and Wi-Fi at the same time.
>
> Hope this helps, good luck.
>
> Regards
> Jostein A. Jacobsen
>
> 2008/11/8 Shao Chong Oh <mir...@ho...>
>
>  Hi everyone,
>
> I'm currently looking for a microprocessor that is capable of connecting to
> a webcam and a wireless chip, so that I can capture, process and then
> transmit the video images wirelessly. May I know if any product in Gumstix
> is good for that? Any recommendations/comments? Thanks a lot!
>
> Regards,
> Shaochong
>
>
>
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