Difference between revisions of "Camera interface"
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On this page you will find useful informations on how to use the Camera/CMOS Sensor Interface (CSI) of the i.MX chip found on your APF board. | On this page you will find useful informations on how to use the Camera/CMOS Sensor Interface (CSI) of the i.MX chip found on your APF board. | ||
| − | Currently only the | + | Currently only the [[APF27]] & [[APF6]] are supported. |
==Hardware== | ==Hardware== | ||
| − | * All the signals of the i.MX27 CSI interface can be found on the J9 connector of the APF27Dev development board. | + | ===APF27=== |
| − | * You should connect an external camera compatible with the CSI interface (8bits) to see something ;-). Here are the tested models: | + | * All the signals of the i.MX27 CSI interface can be found on the J9 connector of the [[APF27Dev|APF27Dev development board]]. |
| − | ** [[OV9653]] | + | * You should connect an external camera/sensor compatible with the CSI interface (8bits data bus) to see something ;-). Here are the tested sensor models: |
| + | ** [[OV9653]] / [[OV9655]] | ||
| + | ** [[OV7670]] | ||
| + | ** [[OV3640]] | ||
| + | * All these sensors are controllable through an I2C interface. The one on J8 connector of [[APF27Dev]] can for example be used. | ||
| + | |||
| + | ===APF6=== | ||
| + | * [[APF6Dev]] boards have a wandcam (OV5640) compatible connector (near the PCIexpress one). | ||
| + | * MIPI bus is used on [[APF6Dev]] | ||
==Driver== | ==Driver== | ||
| − | * CSI interface can be driven through the V4L2 (Video For Linux) standard interface | + | * From now we consider that you have a supported camera module plugged on your development board |
| − | <pre class=" | + | * CSI interface can be driven through the V4L2 (Video For Linux) standard interface as soon as CSI/MIPI driver is loaded: |
| − | + | {| border="1" cellpadding="10" cellspacing="0" summary="Camera drivers" class="wikitable" | |
| + | |- style="background:#efefef;" align="center" | ||
| + | ! APF27 || APF6 (kernel 3.19+) | ||
| + | |--- | ||
| + | |<pre class="apf"> | ||
| + | # modprobe mx27_camera | ||
</pre> | </pre> | ||
| − | <pre class=" | + | * Then you have to load your camera driver in order for him to "attach" to the CSI one (for example for the OV9653): |
| − | + | <pre class="apf"> | |
| − | + | # modprobe ov96xx | |
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
</pre> | </pre> | ||
| − | + | | | |
<pre class="apf"> | <pre class="apf"> | ||
| − | + | # modprobe -a mx6-camera mipi-csi2 ov5640-mipi | |
</pre> | </pre> | ||
| + | |} | ||
| + | |||
| + | |||
| + | * Now it's up to you to configure your camera with the tools/API the camera driver is offering... | ||
| + | |||
| + | ==Test== | ||
| + | * We have a small SDL/V4L2 app to quickly test that your camera is working properly (you will also need a LCD interface): ''target/demos/camera/capture/'' | ||
| + | ** it may be installed by default on your rootfs depending on your Buildroot defconfig. | ||
| + | ** to launch it (here to have a 640x480 camera image on a LW700 TFT): | ||
| + | <pre class=apf> | ||
| + | # capture --width 640 --height 480 --cam_width 640 --cam_height 480 | ||
| + | </pre> | ||
| + | |||
| + | * To trigger autofocus (APF6 with 3.19+ kernel): | ||
| + | <pre class=apf> | ||
| + | # v4l2-ctl -c auto_focus_start=1 | ||
| + | </pre> | ||
| + | |||
| + | ==Going further== | ||
| + | * [[Using the i.MX27 video codec|Using the i.MX27 video codec]] | ||
| + | |||
| + | ==Links== | ||
| + | * [http://linux.bytesex.org/v4l2/ Video4Linux] | ||
| + | |||
| + | [[Category:Vision]] | ||
Latest revision as of 15:54, 1 April 2016
On this page you will find useful informations on how to use the Camera/CMOS Sensor Interface (CSI) of the i.MX chip found on your APF board. Currently only the APF27 & APF6 are supported.
Hardware
APF27
- All the signals of the i.MX27 CSI interface can be found on the J9 connector of the APF27Dev development board.
- You should connect an external camera/sensor compatible with the CSI interface (8bits data bus) to see something ;-). Here are the tested sensor models:
- All these sensors are controllable through an I2C interface. The one on J8 connector of APF27Dev can for example be used.
APF6
- APF6Dev boards have a wandcam (OV5640) compatible connector (near the PCIexpress one).
- MIPI bus is used on APF6Dev
Driver
- From now we consider that you have a supported camera module plugged on your development board
- CSI interface can be driven through the V4L2 (Video For Linux) standard interface as soon as CSI/MIPI driver is loaded:
| APF27 | APF6 (kernel 3.19+) |
|---|---|
# modprobe mx27_camera
# modprobe ov96xx |
# modprobe -a mx6-camera mipi-csi2 ov5640-mipi |
- Now it's up to you to configure your camera with the tools/API the camera driver is offering...
Test
- We have a small SDL/V4L2 app to quickly test that your camera is working properly (you will also need a LCD interface): target/demos/camera/capture/
- it may be installed by default on your rootfs depending on your Buildroot defconfig.
- to launch it (here to have a 640x480 camera image on a LW700 TFT):
# capture --width 640 --height 480 --cam_width 640 --cam_height 480
- To trigger autofocus (APF6 with 3.19+ kernel):
# v4l2-ctl -c auto_focus_start=1
