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The NAND flash and the xD-Picture Card are ideally suited to store files with a directory
structure. The Dynamic C FAT file system module provides support for a file system and
for formatting the xD-Picture Card for use in a Rabbit-based system. Visit our Web site at
www.zworld.com or contact your Z-World sales representative or authorized distributor
for further information on the Dynamic C FAT File System and other Dynamic C modules.
The supporting documentation for the Dynamic C FAT File System and the sample pro-
grams in the SAMPLES\FileSystem folder illustrate the use of the Dynamic C FAT file
system.
5.2.5 SRAM Use
The RCM3360/RCM3370 have a battery-backed data SRAM and a program-execution
SRAM. Dynamic C provides the protected keyword to identify variables that are to be
placed into the battery-backed SRAM. The compiler generates code that maintains two
copies of each protected variable in the battery-backed SRAM. The compiler also generates
a flag to indicate which copy of the protected variable is valid at the current time. This flag
is also stored in the battery-backed SRAM. When a protected variable is updated, the
“inactive” copy is modified, and is made “active” only when the update is 100% complete.
This assures the integrity of the data in case a reset or a power failure occurs during the
update process. At power-on the application program uses the active copy of the variable
pointed to by its associated flag.
The sample code below shows how a protected variable is defined and how its value can
be restored.
protected nf_device nandFlash;
int main() {
...
_sysIsSoftReset();
// restore any protected variables
The bbram keyword may also be used instead if there is a need to store a variable in bat-
tery-backed SRAM without affecting the performance of the application program. Data
integrity is not assured when a reset or power failure occurs during the update process.
Additional information on bbram and protected variables is available in the Dynamic C
User ’s Manual .
User ’s Manual
39
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相关PDF资料
101-1050-BE-00025
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相关代理商/技术参数
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