Posted on October 22, 2016 at 22:41Hi there,
I have a F7 setup with running LTDC, DMA2D and SDRAM to drive a tft display. The VRAM buffer is defined in SDRAM memory.
When I use the standard SDRAM address mapping at 0xC0000000, the display works fine without pixel errors.
However, when I remap the SDRAM to 0x60000000 (__HAL_SYSCFG_REMAPMEMORY_FMC_SDRAM), the dispaly shows pixel errors. It's like the image/menu is loaded only up to 99%. Some pixels change to their final color after a short delay.
The reason because I remapped the SDRAM is because I placed the heap into SDRAM and need it to support unaligned access. That's only possible for addresses lower a certain value and 0xC0000000 is out of that range. I get HardFaults.
Can someone please confirm this pixel error problem with remapped SDRAM?
Is there a solution?
Thank you!
Best regards,
Matthias
#stm32f7-sdram-pixel-bug
