today i taught i give it a try to use the DE Line for HSYNCing
DE – stands for Datavalid and it is basically a controll line which is
high whenever there is valid pixel data.
I modified the Board and removed the connection from ADV7611_HSYNC to
CSI1_HSYNC and made a new connection by connecting ADV7611_DE to CSI1_HSYNC.
Actually I don’t use direct connections but 33 Ohm Series resistors –
but if you don’t have those resistors lying around you can use straight
wires I guess (as long as you dont make shorts)
and yes it worked …
I am not sure what went wrong in first place but this is a sollution we
can continue working …
As modifying the HOR_START Register from the CSI1 Perihperal didn’t show
any difference, i suspect that there is something strange with CSI1 –
maybe there is a BUG in Silicon of the CSI1 Peripheral.
But there is probably more to this issue – maybe the
registers are not set correctly.
Attached see a Grayscale sample (for some reason the v4l2-capture tool
makes sometimes problems) – captured via gstreamer-1.2.4
and here is the mod of the board: