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NAND Flash Driver
(often 512, 2048 or 4096 bytes) and a spare area (often 1/32 the size of the data area). The
page is fundamentally the smallest programmable unit, but some devices allow several
program operations per page between erases.
NAND flash experience occasional bit-errors, where one or more bits stored are flipped
upon retrieval. An error-correcting code (ECC) is required so software can correct these
bit-errors or take appropriate measures if too many errors occur. A single bit
error-correcting code per 512 bytes of data is sufficient for single-level cell (SLC) flash.
The driver RAM requirement depends on flash parameters such as block size and run-time
configurations such as sector size. Typical cases can be found in the datasheet.
14-3 USING A NAND DEVICE (SOFTWARE ECC)
To use the NAND driver, five files, in addition to the generic file system files, must be
included in the build:
■
fs_dev_nand.c .
■
fs_dev_nand.h .
■
fs_dev_nand_bsp.c (located in the user application or BSP).
■
A physical-layer driver, typically
one
provided
in
\Micrium\Software\uC-FS\Dev\NAND\PHY
The file fs_dev_nand.h must also be #included in any application or header files that
directly reference the driver (for example, by registering the device driver). The following
directories must be on the project include path:
■
\Micrium\Software\uC-FS\Dev\NAND
■
\Micrium\Software\uC-FS\Dev\NAND\PHY
A single NAND volume is opened as shown in Listing 14-1. The file system initialization
( FS_Init() ) function must have previously been called and the NAND device driver,
FSDev_NAND, registered (using FS_DevDrvAdd()).
140
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