Question: How can store CircularBuffer in PSRAM on ESP32?

[debsahu]

I would like to not use the RAM on ESP32, but rather use PSRAM attached using SPI interface. Data can be stored directly on PSRAM using ps_malloc() as per esp32-hal-psram.c.

I declare CircularBuffer<time_t, 2880> logTimeBuffer; globally that stores stuff in regular RAM. So is there a way to call ps_malloc() to use the PSRAM?

There is a good reference on doing this for ArduinoJson is here

[rlogiacco]

You can either change the source code for your case or use a macro switch to switch to a different implementation: I might consider accepting a pull request which uses the latter, but you need to test it also against AVR8 platforms as I don't want to break the library to support a corner case.

[debsahu]

https://github.com/debsahu/CircularBuffer

@rlogiacco I changed the array T buffer[S] to pointer T buffer* and used malloc() for all other boards and heap_caps_malloc() for ESP32 with PSRAM. I am not an expert in C/C++, but gave it a shot. I need help with why it is crashing.

[rlogiacco]

Sorry, I'm not an expert on ESP32, but if you found a solution I'll be very willing to publish your solution.
On a second thought, after looking at your code, why didn't you just instantiate the CircularBuffer on PSRAM instead of declaring it globally?

I mean, why didn't you simply:

psramInit();
CircularBuffer<time_t, 2880> logTimeBuffer = (CircularBuffer)heap_caps_malloc(...)

[debsahu]

Thank you will try that, my testing ESP32 unit with PSRAM is stuck at work (future me: due to a global pandemic). I will test it out next week.

[rlogiacco]

closing this as we got no feedback from the OP