A volume, once it is open, may need to be formatted before files or directories can be created. The default format is selected by passing a NULL pointer as the second parameter of FSVol_Fmt(). Alternatively, the exact properties of the file system can be configured with a FS_FAT_SYS_CFG structure. An example of populating and using the FAT configuration is shown in the listing below Listing - Example device format. If the configuration is invalid, an error will be returned from FSVol_Fmt(). For more information about the FS_FAT_SYS_CFG structure, see FS_FAT_SYS_CFG.
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| Example device format | | linenumbers | true |
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void App_InitFS (void)
{
FS_ERR err;
FS_FAT_SYS_CFG fat_cfg;
.
.
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fat_cfg.ClusSize = 4; /* Cluster size = 4 * 512-B = 2-kB.*/
fat_cfg.RsvdAreaSize = 1; /* Reserved area = 1 sector. */
fat_cfg.RootDirEntryCnt = 512; /* Entries in root dir = 512. */
fat_cfg.FAT_Type = 12; /* FAT type = FAT12. */
fat_cfg.NbrFATs = 2; /* Number of FATs = 2. */
FSVol_Fmt("ram:0:", &fat_cfg, &err);
if (err != FS_ERR_NONE) {
APP_TRACE_DEBUG(("Format failded.\r\n"));
}
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} |