Devices and Volumes
Device Object Pool
Device closed
(b)
(a)
All
references
Device
could not be
Device
not
Closed
released
Closing
initialized
Opening
present
Open
Device
removed or
unresponsive
Device
Device closed
Low
inserted
Format
Valid
Device
low level
formatted
Present
Figure 5-2 Device state transition.
Prior to FSDev_Open() being called (a), software is ignorant of the presence, state or
characteristics of the particular device. After all references to the device are released (b), this
ignorance again prevails,and any buffers or structures are freed for later use.
The return error code from this functions provides important information about the device
state:
If the return error code is FS_ERR_NONE , then the device is present, responsive and
low-level formatted; basically, it is ready to use.
If the return error code is FS_ERR_DEV_INVALID_LOW_FMT , then the device is present
and responsive, but must be low-level formatted. The application should next call
FSDev_NOR_LowFmt() for the NOR flash
70
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