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authorMauro Carvalho Chehab <mchehab@s-opensource.com>2016-07-17 16:03:31 -0300
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2016-07-17 22:41:07 -0300
commit70c95242c45d7e6af4c0b4aba4119280eb3aa5de (patch)
tree5f53f78613b175a3798a7aafe06d7fa5e292a391 /Documentation/video4linux/cpia2_overview.txt
parentbde8bea759f45f24392d3114f550e05ec9635bd9 (diff)
[media] doc-rst: Move v4l docs to media/v4l-drivers
Move V4L documentation files to media/v4l-drivers. Those aren't core stuff, so they don't fit at the kAPI document. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
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- Programmer's View of Cpia2
-
-Cpia2 is the second generation video coprocessor from VLSI Vision Ltd (now a
-division of ST Microelectronics). There are two versions. The first is the
-STV0672, which is capable of up to 30 frames per second (fps) in frame sizes
-up to CIF, and 15 fps for VGA frames. The STV0676 is an improved version,
-which can handle up to 30 fps VGA. Both coprocessors can be attached to two
-CMOS sensors - the vvl6410 CIF sensor and the vvl6500 VGA sensor. These will
-be referred to as the 410 and the 500 sensors, or the CIF and VGA sensors.
-
-The two chipsets operate almost identically. The core is an 8051 processor,
-running two different versions of firmware. The 672 runs the VP4 video
-processor code, the 676 runs VP5. There are a few differences in register
-mappings for the two chips. In these cases, the symbols defined in the
-header files are marked with VP4 or VP5 as part of the symbol name.
-
-The cameras appear externally as three sets of registers. Setting register
-values is the only way to control the camera. Some settings are
-interdependant, such as the sequence required to power up the camera. I will
-try to make note of all of these cases.
-
-The register sets are called blocks. Block 0 is the system block. This
-section is always powered on when the camera is plugged in. It contains
-registers that control housekeeping functions such as powering up the video
-processor. The video processor is the VP block. These registers control
-how the video from the sensor is processed. Examples are timing registers,
-user mode (vga, qvga), scaling, cropping, framerates, and so on. The last
-block is the video compressor (VC). The video stream sent from the camera is
-compressed as Motion JPEG (JPEGA). The VC controls all of the compression
-parameters. Looking at the file cpia2_registers.h, you can get a full view
-of these registers and the possible values for most of them.
-
-One or more registers can be set or read by sending a usb control message to
-the camera. There are three modes for this. Block mode requests a number
-of contiguous registers. Random mode reads or writes random registers with
-a tuple structure containing address/value pairs. The repeat mode is only
-used by VP4 to load a firmware patch. It contains a starting address and
-a sequence of bytes to be written into a gpio port.