External RAM

[dmb-220]

do you plan to implement PSRAM in the future?

there would be more opportunities.

or maybe it already works? just need to esp32 accordingly with PSRAM

[mrcodetastic]

ESP32's can't do DMA from PSRAM

https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/external-ram.html

External RAM cannot be used as a place to store DMA transaction descriptors or as a buffer for a DMA transfer to read from or write into. Any buffers that will be used in combination with DMA must be allocated using heap_caps_malloc(size, MALLOC_CAP_DMA) and can be freed using a standard free() call.

[mrweaver]

Food for thought, regarding the ESP-S3:

Note, although ESP32-S3 has hardware support for DMA to/from external RAM, this is not yet supported in ESP-IDF.