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| 型號(hào)： | 101-1102 |
| 廠商： | Rabbit Semiconductor |
| 文件頁(yè)數(shù)： | 57/112頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | KIT DEV RABBIT RCM4100 INTL |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | RabbitCore 4000 |
| 類型： | MPU 模塊 |
| 適用于相關(guān)產(chǎn)品： | RCM4100 |
| 所含物品： | RabbitCore 模塊，開發(fā)板，纜線和 Dynamic C? CD-Rom |
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User’s Manual
45
5.2 Dynamic C Function Calls
5.2.1 Digital I/O
The RCM4100 series of modules 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 exam-
ple, 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 auxiliary I/O bus on the Rabbit 4000 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/RCM4100 folder provide further
examples.
5.2.2 Serial Communication Drivers
Library files included with Dynamic C provide a full range of serial communications sup-
port. The RS232.LIB library provides a set of circular-buffer-based serial functions. The
PACKET.LIB
library provides packet-based serial functions where packets can be delimited
by the 9th bit, by transmission gaps, or with user-defined special characters. Both libraries
provide blocking functions, which do not return until they are finished transmitting or
receiving, and nonblocking functions, which must be called repeatedly until they are fin-
ished, allowing other functions to be performed between calls. For more information, see
the Dynamic C Function Reference Manual and Technical Note TN213, Rabbit Serial
Port Software.
5.2.3 SRAM Use
The RCM4100 series of modules has a battery-backed data SRAM and a program-execu-
tion 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.
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