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| − | The MT9V032 sensor at the heart off the CaspaPX is not yet supported in the kernel, so a little work is necessary to get the camera up and running.
| + | For information about the Caspa camera boards, go to the [http://wiki.gumstix.org/index.php?title=Caspa_camera_boards wiki page]. |
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| − | OMAP35x processors have dedicated hardware for capturing and processing data from image sensors. The CaspaPX camera sensor outputs raw 10-bit Bayer images which is transfered to the Image Signal Processor (ISP) via a parallel interface. The ISP contains various submodules that can be exported as Video for Linux (V4L2) devices in /dev. For additional hardware information see the external links section.
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| − | TODO: include a photo taken with the camera
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| − | == Quickstart ==
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| − | The first steps are important to verify your hardware setup and to test your customizations later. (TODO:what are you trying to say with this sentence?)
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| − | === Install Pre-built Kernel ===
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| − | The easiest way to get started is to replace the kernel and modules of an existing image. This was tested on an Overo Fire with a Tobi expansion board using the desktop image available [http://www.sakoman.com/feeds/omap3/glibc/images/overo/201011150741/ here].
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| − | Get the kernel and modules.
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| − | $ mkdir ~/caspakernel
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| − | $ cd ~/caspakernel
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| − | $ wget http://cumulus.gumstix.org/images/caspapx/uImage-2.6.34-r100-overo.bin
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| − | $ mv uImage-2.6.34-r100-overo.bin uImage
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| − | $ wget http://cumulus.gumstix.org/images/caspapx/modules-2.6.34-r100-overo.tgz
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| − | Extract the modules.
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| − | $ tar -xzf modules-2.6.34-r100-overo.tgz
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| − | Copy them to an Overo already running the image that you want.
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| − | $ scp -r lib root@overo:/
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| − | $ scp uImage root@overo:/boot/uImage
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| − | $ scp uImage root@overo:/media/mmcblk0p1/uImage
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| − | (This relies on a network connection to the Overo---perhaps the manual modify the SD card method is better?)
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| − | Reset the overo.
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| − | $ ssh root@overo 'depmod; shutdown -r now'
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| − | (should this be 'depmod -a'?)
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| − | === Test === | + | |
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| − | From the serial console:
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| − | # export DISPLAY=:0.0
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| − | # gst-launch v4l2src ! xvimagesink
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| − | ''or''
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| − | # mplayer tv:// -tv driver=v4l2:device=/dev/video0
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| − | From the desktop:
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| − | <left-click> Applications > Multimedia > Cheese
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| − | If video0 doesn't appear in /dev you might have to load the driver manually.
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| − | # depmod
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| − | # modprobe omap34xxcam
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| − | # modprobe mt9v032
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| − | == Bitbake ==
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| − | You can build the kernel and modules using bitbake. This allows you to incorporate the kernel with camera drivers into an image of your design.
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| − | $ bitbake linux-omap3-caspapx
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| − | The kernel and modules will appear in ~/overo-oe/tmp/deploy/glibc/images/overo
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| − | == Customization ==
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| − | This section describes how to customize the camera driver and kernel for your needs.
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| − | === 2.6.34 ===
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| − | Get the kernel source that is used in the Gumstix kernel recipe (~/overo-oe/org.openmebedded.dev/recipes/linux/linux-omap3_2.6.34.bb) and create a new branch from the recipe SRCREV.
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| − | $ cd ~
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| − | $ git clone git://www.sakoman.com/git/linux-omap-2.6.git
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| − | $ cd linux-omap-2.6
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| − | $ git checkout -b 2.6.34 cb89736af28f583598e49a05249334a194d00f1d
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| − | Get the patch and defconfig
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| − | $ wget http://cumulus.gumstix.org/sources/mt9v032-2.6.34.patch
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| − | $ wget http://cumulus.gumstix.org/sources/mt9v032-2.6.34.defconfig
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| − | $ patch -p1 < mt9v032-2.6.34.patch
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| − | $ cp mt9v032-2.6.34.defconfig .config
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| − | (Why make people patch? Just provide the good defconfig.)
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| − | Add the cross compiler to your path and configure the kernel. The cross compiler location depends on the architecture of your build machine. If you haven't done so yet, you'll need to [http://www.gumstix.net/Setup-and-Programming/view/Overo-Setup-and-Programming/Setting-up-a-build-environment/111.html set up your build environment].
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| − | Build the console image. This will ensure that the cross compiler, binutils, and libraries need to compile the kernel are installed.
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| − | $ bitbake omap3-console-image
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| − | Add the cross tools to your path.
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| − | ''32-bit processors''
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| − | $ export PATH=/home/<username>/overo-oe/tmp/sysroots/i686-linux/usr/armv7a/bin:${PATH} <br />
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| − | ''64-bit processors''
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| − | $ export PATH=/home/<username>/overo-oe/tmp/sysroots/x86_64-linux/usr/armv7a/bin:${PATH}
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| − | Ensure that the following modules are enabled
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| − | $ make ARCH=arm menuconfig
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| − | -> System Type
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| − | -> OMAP34xx Based System
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| − | -> Device Drivers
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| − | -> Multimedia support (must be built-in)
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| − | -> Video For Linux (must be built-in)
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| − | -> Video capture adapters (must be built-in)
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| − | -> SoC camera support
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| − | -> OMAP 3 Camera support
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| − | -> mt9v032 support
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| − | (Please list the 'CONFIG_' options that are changed.)
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| − | n the Linux shell.
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| − | While I really like the Ubuntu (and yes, OE) display environment when
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| − | connected over HDMI, working in X can become sluggish. This is why I
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| − | prefer ssh-ing. That also let's me be on my desk at my comfortable
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| − | workstation, instead of where the COM is connected to some other
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| − | device it is controlling (and saves having to connect a big display).
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| − | By having an IDE hosted by the COM itself, its my workstation browser
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| − | doing the rendering hard work. You also don't need to put things into
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| − | a headless deployment mode to save cycles and energy. If you're not
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| − | using the IDE, the webserver just sits there.
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| − | Build kernel and modules
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| − | $ make ARCH=arm CROSS_COMPILE=arm-angstrom-linux-gnueabi- uImage
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| − | $ make ARCH=arm CROSS_COMPILE=arm-angstrom-linux-gnueabi- modules
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| − | Install modules
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| − | $ mkdir ~/linux-omap-2.6/modules
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| − | $ make ARCH=arm CROSS_COMPILE=arm-angstrom-linux-gnueabi- INSTALL_MOD_PATH=./modules modules_install
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| − | === Other Kernel Versions ===
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| − | The ISP code used for the 2.6.34 patch came from the arago-project. This is the OMAP3 PSP kernel integration/staging tree
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| − | $ git remote add git://arago-project.org/git/projects/linux-omap3.git aragoOMAP3 PSP kernel integration/staging tree
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| − | $ git fetch arago
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| − | $ git checkout -b arago
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| − | The V4L2 subdevice framework offers a way to configure the Image Signal Processor pipeline from userspace. This is currently under active development and users wishing to make use of this should visit the Media controller development repository [http://git.linuxtv.org/pinchartl/media.git here]. This contains the bleeding edge Video for Linux media framework, ISP, and MT9V032 drivers.
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| − | === MT9V032 Driver ===
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| − | If you want to take advantage of an unimplemented sensor feature, change defaults, etc., you need to modify the driver source. First, make sure that you change your kernel configuration to build the MT9V032 as a module unless you're only making a minor change. This will allow you to test your changes
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| − | Here is a convenient script for updating the driver after you've made a change:
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| − | #! /bin/bash <br>
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| − | target_overo="root@10.0.1.15"
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| − | make -j8 ARCH=arm CROSS_COMPILE=arm-angstrom-linux-gnueabi- modules
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| − | ssh $target_overo 'rmmod mt9v032'
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| − | scp drivers/media/video/mt9v032.ko $target_overo:/lib/modules/2.6.34/kernel/drivers/media/video/
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| − | ssh $target_overo 'modprobe mt9v032'
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| − | === Image Signal Processor ===
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| − | There is some code that you can't modularize and modifying means rebuilding the kernel. Such is the case for the ISP code which is used by board-overo.c for hardware configuration. Another script like that in the previous section can be very useful.
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| − | This script rebuilds the kernel, copies it to the COM, and resets:
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| − | #! /bin/bash <br />
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| − | target_overo="root@10.0.1.15"
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| − | make -j8 ARCH=arm CROSS_COMPILE=arm-angstrom-linux-gnueabi- uImage;
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| − | scp arch/arm/boot/uImage $target_overo:/boot/uImage;
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| − | scp arch/arm/boot/uImage $target_overo:/media/mmcblk0p1/uImage
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| − | ssh $target_overo 'shutdown -r now'
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| − | ($TARGET_OVERO may be clearer than $target_overo)
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| − | This is useful for adjusting the filters, white balance, and color blending coefficients used by the ISP preview module. The preview module is used for doing hardware conversion from 10-bit Bayer to YUV. If you are having color problems - especially under certain lighting conditions but not others - look at '''isppreview.c''' and the gamma correction tables in '''drivers/media/video/isp/'''
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| − | == External Links ==
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| − | [http://focus.ti.com/general/docs/lit/getliterature.tsp?literatureNumber=spruf98m&fileType=pdf OMAP35x Technical Reference Manual]
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| − | [http://www.aptina.com/assets/downloadDocument.do?id=668 MT9V032 Datasheet]
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| − | [http://pubs.gumstix.com/boards/CASPAPX/PCB30009-R2496/ CaspaPX CAD files]
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