diff options
author | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2016-07-17 16:03:31 -0300 |
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committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2016-07-17 22:41:07 -0300 |
commit | 70c95242c45d7e6af4c0b4aba4119280eb3aa5de (patch) | |
tree | 5f53f78613b175a3798a7aafe06d7fa5e292a391 /Documentation/video4linux/cpia2_overview.txt | |
parent | bde8bea759f45f24392d3114f550e05ec9635bd9 (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>
Diffstat (limited to 'Documentation/video4linux/cpia2_overview.txt')
-rw-r--r-- | Documentation/video4linux/cpia2_overview.txt | 38 |
1 files changed, 0 insertions, 38 deletions
diff --git a/Documentation/video4linux/cpia2_overview.txt b/Documentation/video4linux/cpia2_overview.txt deleted file mode 100644 index ad6adbedfe50..000000000000 --- a/Documentation/video4linux/cpia2_overview.txt +++ /dev/null @@ -1,38 +0,0 @@ - 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. |