SPIRAM

Overview

This sample shows how to allocate memory from SPIRAM by using shared_multi_heap_aligned_alloc() with SMH_REG_ATTR_EXTERNAL attribute. Checks if the memory was correctly allocated then frees it by calling shared_multi_heap_free(). It also allocates memory from internal memory and checks if the address range is correct.

Supported SoCs

The following SoCs are supported by this sample code so far:

• ESP32

• ESP32-S2

• ESP32-S3

Building and Running

Make sure you have your board connected over USB port.

west build -b esp32s3_devkitm/esp32s3/procpu samples/boards/espressif/spiram_test
west flash

If using another supported Espressif board, replace the argument in the above command with a proper board name (e.g., esp32s2_saola).

Sample Output

To check output of this sample, run west espressif monitor or any other serial console program (e.g., minicom, putty, screen, etc). This example uses west espressif monitor, which automatically detects the serial port at /dev/ttyUSB0:

$ west espressif monitor

*** Booting Zephyr OS build v3.7.0-446-g93c9da66944c ***
SPIRAM mem test pass
Internal mem test pass