[Solved] Problem with switching on the PSRAM on the ESP32 WEMOS LOLIN LIGHT board

Hi. I have added myself a PSRAM (8MB, APS6404L) to the WEMOS LOLIN 32 Light board. I just need to enable the support. I'm using Arduino IDE 2. There is an option in the menu to enable/disable PSRAM support, but it only appears on boards that have PSRAM as standard.
I don't know how to do it in Arduino for a board that doesn't have PSRM as standard. Theoretically in sdkconfig the entries are:


However, the SPI RAM is not initialised for my board. I think this is due to the way the board itself is defined in Arduino.
I did the SPI RAM addition according to this description: https://blog.pagefault-limited.co.uk/lolin32-lite-esp32-8mb-psram-upgrade-mod
According to the description here: https://arduinojson.org/v6/how-to/use-external-ram-on-esp32/ for Arduino you don't need to configure anything and the SPI RAM should supposedly be detected by itself. But it seems to me that it depends on the board definition.
I even set in sdkconfig:
CONFIG_SPIRAM_BOOT_INIT =y
CONFIG_SPIRAM_USE_MEMMAP =y

After reset I see only these entries:
PSRAM found: 0
PSRAM not found, inputBufferSize: 6399 bytes

Any ideas?

speedy9 wrote:

However, the SPI RAM is not initialised for my board. It seems to me that this is due to the way the board itself is defined in Arduino.

That seems to be the case, unless there are electrical issues. Have you tried with "twin" board definitions of e.g. LOLIN D32 PRO?

I haven't tried. And it's not like even if it "fixes" PSRAM for me it messes up other things?
Maybe rather to the compiler pass -DBOARD_HAS_PSRAM

speedy9 wrote:

And it's not like even if it "fixes" the PSRAM for me it will mess up other things?

I don't think so. The differences between the ESP32 board variants are minor, e.g. the built-in LED plugged into a different pin. Or you can always use the generic "ESP32 Dev" variant. There will be more options to set up in the Arduino IDE.

Successful. I edited the file C:³³³[user]³³³³AppData³³³ocalArduino15.0.11.11.txt adding in the LOLIN32 LIGHT board part such an entry:

lolin32-lite.build.defines=-DBOARD_HAS_PSRAM

It compiled, uploaded to the board and:
20:28:04.276 -> [ 459][I][esp32-hal-psram.c:96] psramInit(): PSRAM enabled
20:28:04.318 -> [ 495][D][esp32-hal-cpu.c:244] setCpuFrequencyMhz(): PLL: 480 / 2 = 240 Mhz, APB: 80000000 Hz
20:28:04.351 -> [ 527][I][esp32-hal-i2c.c:75] i2cInit(): Initialising I2C Master: PSRAM INIT: 1
20:28:04.351 -> PSRAM found: 1

20:28:06.590 -> PSRAM found, inputBufferSize: 283615 bytes