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RAM DATA TRANSFERING USING DMA

Hi everyone, I´m working with an STM32F4 kit + STM32F4DIS-LCD + STM32F4DIS-CAM and I´m trying to use DMA to transfer display data to memory ram. Actually, I´ve achived this but I'm having some issues that i can´t solve by my self.

Using the debug mode I've noticed that when i´m using DMA some data stores in RAM are repeated. The questions is what could be the reasons of this kind of issue.

I would really appreciate your help.
Best regards.