Quote:
Originally Posted by hobnail
I'm puzzled about the PSRAM on the Wrover. From what I can find on the internet it's only usable as data storage; i.e., you malloc it and shove stuff into it. At first I was guessing that it's nonvolatile ram but that doesn't seem to be the case.
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It's just ram - the ESP32 has 520K internal ram, but can support up to 4MB external PSRAM. Consider that the M5Paper's display is 960x540 = 518,400 pixels.. so even at two pixels per byte, a single screen-buffer would take half the internal memory - so the extra ram's nice. Just like the main memory, it's lost in deep-sleep, but you've also got some RTC memory that is maintained in sleep (8K I believe?).