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TECHNICAL GLOSSARY

Memory

SRAM, PSRAM, flash and non-volatile storage: where code runs, where data stays and what survives a reset.

terms in this category

Basic

SRAM

Fast volatile memory used by running code, stacks, buffers and the heap.

Network buffers and concurrent tasks can exhaust it; monitor heap usage and fragmentation.

Intermediate

Higher-capacity external RAM with lower performance than internal SRAM.

It is useful for displays, images and temporary history, but not every allocation or DMA transfer can use it.

Basic

Non-volatile memory that stores the bootloader, firmware, partitions and files.

Writes have a limited lifetime; frequent records need a wear-management strategy.

Basic

Internal memory written during manufacturing with boot routines and basic functions.

Its contents depend on the silicon revision and cannot be updated by the project.

Advanced

A memory region powered in the RTC domain and preserved in certain sleep modes.

It can keep minimal state between deep-sleep cycles without writing flash.

Intermediate

ESP-IDF key-value non-volatile storage.

It suits configuration, calibration and credentials; it does not replace a time-series database.