UM2222 Rev 2 17/76
UM2222 Kernel description
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3.7 Backup and settings configuration
The STM32Cube demonstration saves the kernel and module settings using the following
method:
• Using the RTC backup register (32-bit data width): the data to save must be a 32-bit
data and can be defined as a bit field structure.
• Two kernel APIs are used to save or restore the structure from the RTC backup
registers.
3.8 Storage units
The STM32Cube demonstration kernel offers a storage unit that is usable to retrieve audio,
bitmaps and video media. The storage unit is initialized during the platform startup and thus
it is available to all the modules during the STM32Cube Demonstration run time.
Figure 8. Available storage units
The unit is accessible through the standard I/O operations offered by the FatFS used in the
development platform. The unit is mounted automatically when the physical media is
connected to the connector on the board.
Table 1 lists the file system interface functions
(FatFS functions) used to deal with the physical storage unit.
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