ov5640 partial solution to the vertical lines

[raduprv]

My solution works for my purposes (still images, highest resolution, manual exposure). I didn't test the video, or lower resolutions. I expect you will have to tweak the registers a bit, but it should be a good starting point.

Basically, the problem is that the sensor can't do long exposure without increasing the gain and/or lowering the clock rate by different means. So the sensor will compensate by increasing the gain, even if you disable that.

However, you can also increase the exposure by changing the vertical and horizontal timing).

s->set_reg(s,0x380c,0xff,0x1f);
s->set_reg(s,0x380d,0xff,0xff);

If you want to increase the exposure even further, you can do something like this:
s->set_reg(s,0x380e,0xff,0x2f);
s->set_reg(s,0x380f,0xff,0xff);

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