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FreeRTOS+FAT for NOR SPI Flash

Posted by hssathya on June 20, 2018

Hi All,

Would you recmmond FreeRTOS+FAT for SPI based NOR FLASH? Is there a port already available for this?

Thanks, Sathya

FreeRTOS+FAT for NOR SPI Flash

Posted by heinbali01 on June 20, 2018

Hi Sathya, you have probably heard that FAT is not an optimal file system to be implemented in NOR flash. But yes, at leat one person has implemented a driver that works well with FreeRTOS+FAT. I will ask if that person is willing to share his code.

If you do not need compatibility with FAT, you could also look around and find a file system especially designed for NOR flash.

FreeRTOS+FAT for NOR SPI Flash

Posted by loszi on June 21, 2018

Hi Sathya, Please find an FreeRTOS+FAT driver for Spansion s25fl164k attached.

As Hein mentioned - using NOR Flash + FAT fs (without some form of wear leveling) is not the best idea, because the intensive usage could kill the FAT area of the device. I recommend using it only for write rarely / read many application like storing configuration.

If you still want to use the driver, you need to customize / implement the following low level functions in the portable directory:

static uint8t ucSpiTransferByte(uint8t ucTXData) static uint8t ucSpiQuadReadByte(void)

and don't forget to call: BaseTypet xSpansionSPISyncCache(FFDiskt pxDisk, cachestampt xOlderThan); before umount / power down for write back the changes.*

As you might see the code is quite experimental so no warranty at all, please use your own risk, and consider that each cache entry consumes 4KiB of RAM.

Regards, Szilárd


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