Oh, and thinking about this a bit, there is some documentation for the
CCDC, VPFE and IPIPE on the Ti website. Go to the main DM355 page to
look for the documentation links.
Anthony Gutierrez wrote:
The camera module I have can uses an Omnivision OV7620:
http://www.electronics123.com/s.nl/it.A/id.42/.f
It has a resolution of 640x480 and can output the CCIR 601/656
standard, which is just the former name of and should be the same as
BT 601/656 correct? Assuming my camera output is pretty close to the
decoder output will I just need to select the imager interface as the
input into the VPFE instead of the tvp5146 decoder and configure my
camera via I2C? How can I do this? Are there functions for using the
I2C bus already? I'm having trouble following the davinci_vpfe.c,
tvp5146.c, ccdc_dm355.c etc. driver files and there seems to be no
documentation on these.
Stephen Berry wrote:
If your sensor is generating BT656 (that is YCbCr with embedded
sync's, horizontal and vertical blanking etc) in D1 format, then you
might not have to do too much. The default input to the 355 is from
the NTSC decoder which uses BT656.
If the sensor output is not identical to the output of an NTSC
decoder, then you will need to modify the ccdc so that you can
capture your frames correctly. If your sync signals are external you
will need to enable the inputs to the VPFE. It is likely that you may
need to modify dm355_vpfe.c and tvp5146.c as well if the sensor raw
output is a different resolution or the sensor itself needs to be
setup differently.
If your sensor does not have an automatic AWB/AE mode, then you will
need to write an application level control loop to manage this.
If you haven't guessed - this can be a big job if your sensor isn't a
direct substitute for a decoder.
Steve
Anthony Gutierrez wrote:
I want to use a CMOS imager outputting 8bit YCbCr 4:2:2 with the
dm355 EVM. What do I need to modify within the davinci_VPFE.c and
ccdc_dm355.c driver files to do something like this? And are there
any other files I need to modify? Is there any guide or
documentation for using these drivers?
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