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I am evaluating the Keil File System Middleware. I have encountered a problem. Hopeful someone could give me a quick and clear hint.
It seems there are two types of file systems in the FS middle ware: Embedded FS and FAT FS.
Could someone tell me the differences between this two types.
I have noticed that NOR flash type be configured to use the Embedded FS type.
Could this Embedded FS be compatible with the USB Mass storage Class?(Treated as a plugged U Disk by the PC).
Could NOR Flash be configured to use the FAT FS? I have noticed the open source FAT FS doesn't distinguish the NOR Flash from other storage media.
Could a pure SPI Flash(i.e. Winbond W25Q32) be configured as the NOR Flash? The official Keil Pack includes a special NOR Flash(AT45DB642D) which supported both bus style NOR flash access method and a SPI style.
Thanks.
You can trick Keil's Middleware to use SPI flash with FAT file system, but flash memory must have sector-level erase capability. I have done that by modifying RAM disk driver to access SPI-attached AT45DB16 SPI flash memory, but it was a tricky job. If you have experience with open-source FAT FS, stick to it. For me it was a clean start, so I decided to use Keil's middleware for all peripherals.
regards
Dejan