PSAM operation with camera application

[owen_chen]

Hi:

When I use ESP32+External 8MB PSRAM(P/N=ESP-PSRAM64)+Camera(Driver IC=OV7725), failed to move camera data to external PSRAM with DMA operation when data is relatively larger, e.g. data of one VGA format picture, PSRAM operates in 80MHz clock, QPI 4-wires.
Anyone has experience involving DMA operating of external PSAM?
Thanks!

[Koepisch]

Hello Owen,

i'm a very new to the ESP32, but i had the same problem (see prior Post). The main problem is, that you can't use DMA transfer to external PSRAM. You can use DMA transfer to copy the data from XY into the internal ram. Then you have to copy the data from internal- to external memory (without DMA).

Regards,
Koepisch