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| 型號(hào)： | 101-1262 |
| 廠商： | Rabbit Semiconductor |
| 文件頁(yè)數(shù)： | 73/120頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | KIT DEV RCM5400W US/INTERNATIONL |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | RabbitCore 5000 |
| 類(lèi)型： | Wi-Fi / 802.11.b |
| 頻率： | 2.4GHz |
| 適用于相關(guān)產(chǎn)品： | RCM5400W |
| 已供物品： | 板，模塊，線纜，CD，電源 |
| 其它名稱(chēng)： | 316-1138 |
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50
RabbitCore RCM5400W
The USERBLOCK_CLEAR.C sample program shows you how to clear and write the con-
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 RCM5400W module has 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.
main() {
protected int state1, state2, state3;
...
_sysIsSoftReset();
// restore any protected variables
The bbram keyword may also be used instead if there is a need to store a variable in
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 bbram and protected variables is available in the Dynamic C
User’s Manual.
5.2.4.1 SRAM Chip Select Considerations
The basic SRAM memory on Rabbit-based boards is always connected to /CS1, /OE1, and
/WE1. Both the data SRAM and the program execution fast SRAM on the RCM5400W
share /OE1.
The BIOS-defined macro, CS1_ALWAYS_ON, is set to 0 by default to disable /CS1 (set it
high). The macro may be redefined in the BIOS to 1, which will set a bit in the MMIDR
register that forces /CS1 to stay enabled (low). This capability is normally used to speed up
access time for battery-backed SRAM as long as no other memory chips are connected to
/OE1 and /WE1. Therefore, the CS1_ALWAYS_ON macro must remain at its default setting
of 0 to avoid conflicts between the data SRAM and the program execution fast SRAM.
5.2.5 Wi-Fi Drivers
Complete information on the Wi-Fi libraries and function calls is provided in Chapter 6.
Additional information on TCP/IP is provided in the Dynamic C TCP/IP User’s Manual.
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