Module psram 

Available on crate feature unstable only.

PSRAM (Pseudo-static RAM, SPI RAM) driver

Overview

This module provides support to interface with PSRAM devices connected to the MCU. PSRAM provides additional external memory to supplement the internal memory of the MCU, allowing for increased storage capacity and improved performance in certain applications.

The ESP32-S3 can use either Quad SPI or Octal SPI to interface with PSRAM. esp-hal will try to automatically detect the best option, but manual configuration is also possible and more reliable.

Examples

PSRAM as heap memory

This example shows how to use PSRAM as heap-memory via esp-alloc.

The PSRAM example must be built in release mode!

extern crate alloc;
use alloc::{string::String, vec::Vec};

// Add PSRAM to the heap.
esp_alloc::psram_allocator!(peripherals.PSRAM, esp_hal::psram);

let mut large_vec: Vec<u32> = Vec::with_capacity(500 * 1024 / 4);

for i in 0..(500 * 1024 / 4) {
    large_vec.push((i & 0xff) as u32);
}

let string = String::from("A string allocated in PSRAM");

Structs

Psram

Enables externally-connected Pseudo-static RAM.

PsramConfig

PSRAM configuration

Enums

FlashFreq

Frequency of flash memory

PsramMode

PSRAM interface mode

PsramSize

Size of PSRAM

SpiRamFreq

Frequency of PSRAM memory

SpiTimingConfigCoreClock

Core timing configuration