Hi Community,
I note that Keil Middleware File System Component supports many types of FLASH storage devices (http://www.keil.com/pack/doc/mw/FileSystem/html/fs_operation.html#drive), however the supported devices are external from the MCU itself (USB drive, SD card, external NOR/NAND flash chip connected over SPI or a bus).
Instead, I would like to use the internal (NOR) FLASH of the MCU (in my case, STM32L471). It would require a low-level driver to read/erase/write the internal FLASH. I thought this might be common given large FLASH sizes available, but I did not find much discussion here or elsewhere specifically about internal FLASH file system.
Is there a reason this is not a common approach?
What I'd like is a basic embedded file system (no directory or long file name support, and only a few files) which would permit store/retrieve/update of various length strings and parameters, from some high level API (like f_open(), f_read(), f_write(), etc.) I intended to store parameters in ASCII and use string conversion functions to translate parameters to integer/floating point values etc. with specific reserved character used as delimiter between parameter keys and corresponding values.
I would appreciate to hear some recommendations on good approach for doing this. Do people find a high level interface unnecessary for basic key/value storage and lookup and instead write their own custom interface? Are there examples of good implementations of that online?
Thanks for suggestions!