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Devices and Volumes
■
If the return error code is
FS_ERR_DEV_NOT_PRESENT ,
FS_ERR_DEV_IO
or
FS_ERR_DEV_TIMEOUT , the device is either not present or did not respond. This is an
important consideration for removable devices. It is still registered with the file system
suite, and the file system will attempt to re-open the device each time the application
accesses it.
■
If any other error code is returned, the device is not registered with the file system. The
developer should examine the error code to determine the source of the error.
5-3 USING REMOVABLE DEVICES
μC/FS expects that any call to a function that accesses a removable device may fail, since
the device may be removed, powered off or suddenly unresponsive. If μC/FS detects such
an event, the device will need to be refreshed or closed and re-opened. FSDev_Refresh()
refreshes a device:
chngd = FSDev_Refresh((CPU_CHAR *)“ide:0:”,
(FS_ERR *)&err);
<-- (b) device name
<-- (c) return error
There are several cases to consider:
■
If the return error is FS_ERR_NONE and the return value (a) is DEF_YES , then a new
device (e.g., SD card) has been inserted. All files and directories that are open on
volumes on the device must be closed and all volumes that are open on the device
must be closed or refreshed.
■
If the return error is FS_ERR_NONE and the return value (a) is DEF_NO , then the same
device (e.g., SD card) is still inserted. The application can continue to access open files,
directories and volumes.
■
If the return error is neither FS_ERR_NONE nor FS_ERR_DEV_INVALID_LOW_FMT , then no
functioning device is present. The device must be refreshed at a later time.
A device can be refreshed explicitly with FSDev_Refresh() ; however, refresh also happens
automatically. If a volume access (e.g., FSVol_Fmt() , FSVol_Rd() ) , entry access
( FSEntry_Create() , fs_remove() ), file open ( fs_fopen() or FSFile_Open() ) or
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