✅ What is PSRAM (Pseudo-static RAM)?

PSRAM is a type of external memory that combines the ease-of-use of SRAM (no need for refresh) with the cost and density of DRAM.

📌 Characteristics:

• Acts like SRAM to the system.
• Internally uses DRAM-like technology.
• Available on many SoCs like ESP32-WROVER (4MB/8MB PSRAM).

🧠 Good Reasons to Use PSRAM:

Feature	Benefit
✅ Large Memory	ESP32 internal RAM is limited (~520KB), PSRAM gives extra space (4MB+).
✅ Multimedia Buffers	Needed for camera frames, audio streaming, image processing, etc.
✅ Heap Allocation	Useful for malloc()/calloc() in applications with large dynamic memory needs.
✅ Caching / File Buffers	Good for storing temporary web pages, images, JSON, etc.
✅ Smooth UI/GUI	Enables usage of libraries like LVGL for rich graphical interfaces.

hook to ESP32

• SCM1030-dat

ESP32	PSRAM	note
IO16	CS
SD0	SIO1
SD1	SIO0
SD2	SIO1
SD3	SIO2
CLK	SCLK

• PIR-dat