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Subject: [media] gspca_pac7302: Document some more registers Author: Hans de Goede <[email protected]> Date: Fri Apr 27 13:00:57 2012 -0300 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: Hans de Goede <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> drivers/media/video/gspca/pac7302.c | 16 +++++++++++++++- 1 files changed, 15 insertions(+), 1 deletions(-) --- http://git.linuxtv.org/media_tree.git?a=commitdiff;h=48bb7315f8205272c69fa49c732adb20b2f08614 diff --git a/drivers/media/video/gspca/pac7302.c b/drivers/media/video/gspca/pac7302.c index 1e88d3a..a2a42f6 100644 --- a/drivers/media/video/gspca/pac7302.c +++ b/drivers/media/video/gspca/pac7302.c @@ -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: * _______________________________________________ linuxtv-commits mailing list [email protected] http://www.linuxtv.org/cgi-bin/mailman/listinfo/linuxtv-commits
