Can DMA2D convert YCbCr format which is the output from OV9655 to RGB 565 and then to the display?

[MSale]

..

[waclawek.jan]

And why wouldn't you convert it in DCMI as received?

JW

[MSale]

@Community member​ 

The DCMI does not convert any thing its just accept different format from the camera. I need to convert YCbCR to RGB because i want to encode the YCbCr to JPEG using the hardware encoder.

[waclawek.jan]

You're right, sorry (it can strip chroma, but that's probably not what you wanted).

The DMA2D which can input YCbCr (in 'H7 - you did not tell us the STM32 model you are using) apears to need it with luma/chroma components arranged "squares" (MCUs) as output from the JPEG decoder, so you'd need to rearrange the data between DCMI and DMA2D "manually" (in program).

JW

[MSale]

@Community member​ 

That sound good idea but i looked on other questions related to the same topic and i saw your answer that the STM32H747 can not do it but it was 1 year ago so do you think this still same or you think its possible to be done and it will be fast too.

Mahmoud

[waclawek.jan]

> i saw your answer that the STM32H747 can not do it

I don't remember it, maybe that was in some particular context.

I don't use video, I was briefly interested when we considered a new product some time ago, but then dropped the idea. So don't have experience to help you further. You may want to try yourself on a Nucleo, EVAL or DISCO board - the camer ainput can be quite easily simulated by software generated pattern (e.g. stripes).

JW