101-1173 Rabbit Semiconductor, 101-1173 Datasheet - Page 54

• Manufacturer Part Number: 101-1173
• Description: RCM4400W DEV KIT UNIVERSAL
• Manufacturer: Rabbit Semiconductor
• Series: RCM4400W RabbitCore™r
• Type: Wi-Fi / 802.11.br

Specifications of 101-1173

• Frequency: 2.4GHz
• Wireless Frequency: 58.98 MHz
• For Use With/related Products: RCM4400W
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 316-1133

The
tents of the user block that you are using in your application (the calibration constants in
the reserved area and the ID block are protected).
5.2.4 SRAM Use
The RCM4400W module has a battery-backed data SRAM and a program-execution
SRAM. Dynamic C provides the
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.
The
battery-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
User’s Manual.
5.2.5 Wi-Fi Drivers
The Wi-Fi drivers are located in the
tion on the Wi-Fi libraries and function calls is provided in Chapter 6. Additional informa-
tion on TCP/IP is provided in the Dynamic C TCP/IP User’s Manual.
5.2.6 Serial Flash Drivers
The 1MB serial flash memory on the RCM4400W is used to bootstrap the FPGA for the
Wi-Fi circuits, and was not available for customer use. Starting with Dynamic C v. 10.54,
it is possible to access 800KB of the serial flash for customer use.
The Dynamic C
LIB\SerialFlash\SFLASH_FAT.LIB
the serial flash. The FAT file system function calls are in the Dynamic C
LIB\FileSystem\FAT_CONFIG.LIB
48
USERBLOCK_CLEAR.C
bbram
main() {
protected int state1, state2, state3;
...
_sysIsSoftReset();
keyword may also be used instead if there is a need to store a variable in
Rabbit4000\LIB\SerialFlash\SFLASH.LIB
bbram
sample program shows you how to clear and write the con-
protected
and
// restore any protected variables
Rabbit4000\LIB\TCPIP
protected
library.
libraries provide the function calls needed to use
keyword to identify variables that are to be
variables is available in the Dynamic C
folder. Complete informa-
and
RabbitCore RCM4400W
Rabbit4000\
Rabbit4000\