They are easily available, provide nearly ‘unlimited’ storage, and, with the FatFS file system, I can easily exchange data with the host. Usually, I use micro-SD cards for logging data. The device uses the following pins:Ī red LED on the breakout module indicates if the board is powered. Such SPI memory devices are very inexpensive I ordered a few breakout modules with Winbond W25Q128 (16 MByte) from AliExpress for $1.50 each. With the addition of a small external device on the SPI bus, I can easily add several MBytes of memory to the microcontroller. The typical usage of external SPI flash memory is using it to load or store data. Winbond w25q128 Serial Flash Breakout Board Why Not Use an External SPI FLASH for a ‘Normal’ Microcontroller, Too? On the other side, many high-performance MCUs, such as the NXP i.MX RT, are ‘flashless’ because the silicon process for high-performance cores is not matching the FLASH memory technology, so they are using external serial SPI or Quad-SPI (QSPI) memory instead. Modern microcontrollers come with plenty of internal FLASH memory.
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