nffs_detect

int nffs_detect(const struct nffs_area_desc *area_descs)

Searches for a valid nffs file system among the specified areas. This function succeeds if a file system is detected among any subset of the supplied areas. If the area set does not contain a valid file system, a new one can be created via a separate call to nffs_format().

Arguments

Argument	Description
area_descs	The set of areas to search. This array must be terminated with a 0-length area.

Returned values

• 0 on success
• FS_ECORRUPT if no valid file system was detected
• Other FS error code on failure

Header file

#include "nffs/nffs.h"

Example

/*** hw/hal/include/hal/flash_map.h */

/*
 * Flash area types
 */
#define FLASH_AREA_BOOTLOADER           0
#define FLASH_AREA_IMAGE_0              1
#define FLASH_AREA_IMAGE_1              2
#define FLASH_AREA_IMAGE_SCRATCH        3
#define FLASH_AREA_NFFS                 4

/*** project/slinky/src/main.c */

int
main(int argc, char **argv)
{
    int rc;
    int cnt;

    /* NFFS_AREA_MAX is defined in the BSP-specified bsp.h header file. */
    struct nffs_area_desc descs[NFFS_AREA_MAX];

    /* Initialize nffs's internal state. */
    rc = nffs_init();
    assert(rc == 0);

    /* Convert the set of flash blocks we intend to use for nffs into an array
     * of nffs area descriptors.
     */
    cnt = NFFS_AREA_MAX;
    rc = flash_area_to_nffs_desc(FLASH_AREA_NFFS, &cnt, descs);
    assert(rc == 0);

    /* Attempt to restore an existing nffs file system from flash. */
    if (nffs_detect(descs) == FS_ECORRUPT) {
        /* No valid nffs instance detected; format a new one. */
        rc = nffs_format(descs);
        assert(rc == 0);
    }
    /* [ ... ] */
}