參數(shù)資料
型號： 101-1226
廠商： Rabbit Semiconductor
文件頁數(shù)： 110/168頁
文件大?。?/td> 0K
描述： RCM3900 DEV KIT UNIVERSAL
標準包裝： 1
系列： RabbitCore 3900
類型： MPU 模塊
適用于相關(guān)產(chǎn)品： RCM3900
所含物品： RabbitCore 模塊、開發(fā)板、交流適配器、纜線和 Dynamic C? 光盤
其它名稱： 316-1137
RabbitCore RCM3900 User’s Manual
46
5.2 Dynamic C Functions
5.2.1 Digital I/O
The RCM3900 was designed to interface with other systems, and so there are no drivers
written specifically for the I/O. The general Dynamic C read and write functions allow
you to customize the parallel I/O to meet your specific needs. For example, use
WrPortI(PEDDR, &PEDDRShadow, 0x00);
to set all the Port E bits as inputs, or use
WrPortI(PEDDR, &PEDDRShadow, 0xFF);
to set all the Port E bits as outputs.
When using the external I/O bus on the Rabbit 3000 chip, add the line
#define PORTA_AUX_IO
// required to enable auxiliary I/O bus
to the beginning of any programs using the auxiliary I/O bus.
The sample programs in the Dynamic C SAMPLES/RCM3900 folder provide further
examples.
5.2.2 SRAM Use
The RCM3900 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 creates a backup copy of
a protected variable before the variable is modified. If the system resets while the protected
variable is being modified, the variable's value can be restored when the system restarts.
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 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 integ-
rity 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.
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