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I can't read sdram framebuffer with LTDC

123scy321
Visitor

I am developping STM32F469 with TouchGFX to display with LTDC in RGB888. I can display an image in the internal SRAM. However, when trying with SDRAM, the screen truns black, and the debugger can only read 0s. But when I tried with the framebuffer reader offered by ST, I can still read the image which seems to be already loaded into the SDRAM. Is there any suggestions to figure out the issue to give a final solution?

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