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RealView FlashFS Question

Chris W

Hi,

Am I going mad? I have the RealView-MDK ARM dev system with the RTOS and TCP/IP package. Included in that is a FAT implementation for Flash devices.

I have an SPI DataFlash (AT45DB321D) which is working fine. Read/Write/Erase etc all tested and functioning.

I now want to use the FAT Filesystem on the dataflash device. However after poking through all the FAT code, it appears it will only work on MMC/SD devices? Or am I missing something?

Any advice would be appreciated.

Thanks

Chris

Parents Reply Children
  • 0 in reply to Jack Sprat

    Thinking about it from an inplementor's point of view I'd be able to provide code that communicates with a generic SD/MMC device but not for an unknown chip with unknown interface. I'd therefore guess that you would need to provide functions to read/write/erase etc yourself, and you've been looking at the part of the code that talks to known devices. Somewhere it'll probably make calls to user defined functions.

  • 0 in reply to Jack Sprat

    Hi Jack,

    I have implemented the routines, spi_init(), spi_send() etc. I have also put the routines in FS_SPI_FlashPrg.c into the project.

    Also enabled the SPI Flash Drive in File_Config.c and set it to default drive.

    Weird thing is,

    If I call fformat("") it returns with no errors, I can see it go into the correct fs_spi_EraseSector function erase the flash and return. It makes no attempt to put any file system on the flash.

    fcheck() fails.

    I tried fat_format( "" ) as well. None of them ever attempt to write data of any sort?

    fopen fails as there is no filesystem, I would assume.

    Also in File_Config.h there is a #ifdef block which fills the FAT functions with null functions (right at the end), if the Memory Card Device support is not included. I don't have a memory card, but I do want to use FAT...What gives?

    Thanks

    Chris

  • 0 in reply to Chris W

    Also in File_Config.h there is a #ifdef block which fills the FAT functions with null functions (right at the end), if the Memory Card Device support is not included. I don't have a memory card, but I do want to use FAT...What gives?

    I'm sorry, but I just don't know. I'd need the code and documentation in front of me to make any more guesses. If it's annoying you now drop Keil a line - I'll bet it's something small that will only be obvious with hindsight!