Atmel Image Sensor Interface driver

This is a v4l2 driver for the Atmel Image Sensor Interface, which is integrated on the AT32AP7000 CPU as well as some AT91SAM926x ones. It consists primarily of a core driver which provides support for the actual ISI module, as well as one camera driver for each supported camera. The camera driver typically uses i2c or a similar protocol to configure the camera and start/stop capturing frames.

Features

• read() interface for capturing a frame
• interface for streaming video (memory mapped buffers; buffers are provided by the driver)
• Codec or Preview data path can be used for streaming
• All mandatory V4L2 Capture Device ioctls implemented

Known issues

• Preview and Codec data path do not work simultaneously.

Interfaces

If the ISI driver is the only video device on the system it will use following device numbers:

• /dev/video0 is the capture interface
• /dev/video1 is the streaming interface

Patches

Against 2.6.23.atmel.5

Examples

Simple v4l2 capture utility

This utility will capture a single frame from a video device and write it to the specified file, or stdout if none is given. To use it:

Usage: capture [-d videodev] [-o outfile]

If no options are given, one frame is grabbed from
/dev/video0 and written to stdout in PPM format.

There is only a single source file, capture.c. Compile it like this

avr32-linux-gcc -o capture -O2 -g -Wall capture.c

and copy the resulting capture file to the target.