Commit 48bb7315 authored by Hans de Goede's avatar Hans de Goede Committed by Mauro Carvalho Chehab

[media] gspca_pac7302: Document some more registers

Note like all info on the pac73xx chips, this info was found by trial and
error, so it is not necessarily 100% correct.
Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 895d464d
......@@ -30,6 +30,14 @@
*
* Address Description
* 0x78 Global control, bit 6 controls the LED (inverted)
* 0x80 Compression balance, 2 interesting settings:
* 0x0f Default
* 0x50 Values >= this switch the camera to a lower compression,
* using the same table for both luminance and chrominance.
* This gives a sharper picture. Only usable when running
* at < 15 fps! Note currently the driver does not use this
* as the quality gain is small and the generated JPG-s are
* only understood by v4l-utils >= 0.8.9
*
* Register page 3:
*
......@@ -43,8 +51,14 @@
* 1 -> ~30 fps, 2 -> ~20 fps
* 0x0e Exposure bits 0-7, 0-448, 0 = use full frame time
* 0x0f Exposure bit 8, 0-448, 448 = no exposure at all
* 0x10 Master gain 0-31
* 0x10 Gain 0-31
* 0x12 Another gain 0-31, unlike 0x10 this one seems to start with an
* amplification value of 1 rather then 0 at its lowest setting
* 0x21 Bitfield: 0-1 unused, 2-3 vflip/hflip, 4-5 unknown, 6-7 unused
* 0x80 Another framerate control, best left at 1, moving it from 1 to
* 2 causes the framerate to become 3/4th of what it was, and
* also seems to cause pixel averaging, resulting in an effective
* resolution of 320x240 and thus a much blockier image
*
* The registers are accessed in the following functions:
*
......
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