MT9M001 Camera and DCMI

simfake · ‎2016-08-31

Posted on September 01, 2016 at 02:08

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simfake · ‎2016-09-02

Posted on September 03, 2016 at 06:09

So I had a look with my logic analyzer. After fixing the bug where I was allowing too many DMA transfers per picture (there is 2 pixels per DMA transfer - wasn't do that), I now have similar problems to before.

HS = Horizontal sync. Every line/row of pixels.

VS = Vsync. Every entire picture

STATUS2: DCMI Line interrupt

STATUS1: DMA interrupt.

First, the 164ms delay seen in the zoomed out picture. I'm enabling DCMI in the DCMI interrupt, and somehow there is a 164ms delay? That would ideally be exactly on the right time.

Second, the data doesn't seem to be valid still. I would expect that the results are just a little bit shifted/the picture is distorted. But no, it's just nor working nicely.

Any ideas? Any ideas for things that I could check?

megahercas6 · ‎2016-09-02

Posted on September 03, 2016 at 08:17

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simfake · ‎2016-09-03

Posted on September 04, 2016 at 04:05

Thanks! On first glance, there's only a little different in the DMA setup, and a lot different in synchronisation. I'll have a look.