![]() ![]() The on-board flash chip of the ESP32 has plenty of space, most have 4MB or 8MB version. Some support 2-bit and 4-bit data buses as well, increasing transfer rates further over a pure serial interface.Ĭompared to modern processors, of course, SPI is slow. SPI interfaces can be moderately fast by cheap embedded controller standards (133MHz). SPI flash modules are handy because they are low cost and have a small footprint. SPI flash is a flash module that is interfaced to over SPI. Flash memory is a kind of non-volatile memory much used for storing programs for simple microprocessors. Flash memory is a type of non-volatile storage that is electrically eraseable and rewriteable. SPI stands for Serial Peripheral Interface. A flash file system is designed for storing files on flash memory–based storage devices optimized for the particular system. The SPI Flash File System or SPIFFS is a light-weight file system for microcontrollers with an SPI flash chip.
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