I’m trying to get an Elecrow 7" (standard, not advances) display panel with ESP32-S3 to work with Lovyan and lvgl. There’s other issues, but the latest one is I’m apparently running out of RAM. I haven’t even done anything yet, but… I’m questioning what I’m even out stating with. The spec calls …

[image] oldmicroguy: Can somebody explain to me what’s happening/wrong? Plase see Why are ESP32-S3 boards' RAM size set to 320 KB? - #2 by maxgerhardt [image] oldmicroguy: Looks like I can’t use PSRAM because the buffer needs to be accessible by the DMA. PSRAM is accessible via DMA. …

[image] sivar2311: PSRAM is accessible via DMA. True but not for the USB module (at least - there may be others). Check the data sheet. It certainly CAN use DMA for memory to memory transfers.

[image] aussiesusan: True but not for the USB module What USB-Module are you referring to? [image] aussiesusan: Check the data sheet. Would be nice to have the link :wink:

[image] sivar2311: PSRAM is accessible via DMA. Hmm… Ok, thanks for the info and links, I’ll check them out. I had read on another site that the PSRAM was not accessible by the DMA, perhaps there’s more details on that, or it was an older chip. One of the perils of reading “stuff” on the i…

Perhaps I’m using an older term in ‘datasheet’ - I have always used it to refer to the technical documentation put out by the manufacturer to detail all key aspects of the hardware item in question. In this case I’m referring to the ESP32S3 Technical Reference Manual (TRM - https://documentation.es…

[image] aussiesusan: Perhaps I’m using an older term in ‘datasheet’ - Everything is fine, I just wanted to know which datasheet exactly - there are so many :slight_smile: [image] aussiesusan: Section 32 covers the USB OTG module Ok, the term USB “module” misled me and let me think of E…

ESP32-S3 memory question

sivar2311 May 15, 2026, 4:44am 2

Plase see Why are ESP32-S3 boards' RAM size set to 320 KB? - #2 by maxgerhardt

PSRAM is accessible via DMA.

Make sure your PSRAM is enabled and setup correctly.
Here you’ll find a config for an ESP32-S3-N4R8: