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Strange Double buffering problem in STM32F4

Question asked by tolba.ahmed on Jun 6, 2018

I'm doing frame buffering exactly as that guy doing

The problem, I'm cloning flappy bird, and at the top edge of the screen, I get a background that clips the sprite.. When I disable the waiting for vertical blanking, of course tearing comes, but I don't get that clipping issue anymore.

Any hints what could be the problem ?

Here is a video