I thought it was about time I shared something after all the hours I've committed to Pi-hacking and the above title says it all. These instructions are very simple but should hopefully save you some trial-and-error.
Importantly, hat-tip to Insipid Ramblings and Hexxeh for their info and work that helped me get this far.
Firstly, I started with a slightly old version of Debian - namely the debian6-19-04-2012 image. Your results may vary depending on what version you use. I am also assuming that you have already installed the image and can successfully boot to the desktop.
So, here goes:
1. Add UVC support to the image
Download and run rpi-update as described here. This will update your image to include the initially-missing UVC support. Reboot as suggested.
2. Update your packages
sudo apt-get update
sudo apt-get upgrade
3. Install the guvcview webcam viewer
sudo apt-get install guvcview
4. Set up your permissions and enable the driver
sudo usermod -a -G video pi
sudo modprobe uvcvideo
Reboot the Pi.
5. Open up the cam (these are the settings that worked for me)
guvcview --size=544x288 --format=yuyv
Well, you are almost done, there are a few things to keep in mind before you rush out to buy one of these webcams for your Pi.
- Before you view the C270 you must disconnect your mouse*. I am not sure if this is problem specific to my install but if I don't the camera will either not connect or will drop out constantly. The error I saw was along the line of not having any "periodic" USB channels.
- The resolution is low. Clicking on the above image will open it at full size (544x288). Trying resolutions above this didn't work.
- The webcam "must" be connected before powering up the Pi. If not you need to run sudo rmmod uvcvideo and sudo modprobe uvcvideo before it will work.
Hopefully this how-to helps you out and if you have more luck than I using a mouse and/or higher resolutions please let me know in the comments.
* Now, "real" Linux people would say that you shouldn't be using one anyway, but when your goal is to use a webcam, it's somewhat inferred that you'd like to see the result in a mouse-equipped GUI :-)