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3.1 Running Sample Program DEMOJR1.C
This sample program can be used to illustrate some of the functions of Dynamic C.
First, open the file DEMOJR1.C , which is in the SAMPLES/JACKRAB folder. The program
will appear in a window, as shown in Figure 4 below (minus some comments). Use the
mouse to place the cursor on the function name WrPortI in the program and type <Ctrl-H> .
This will bring up a documentation box for the function WrPortI . In general, you can do
this with all functions in Dynamic C libraries, including libraries you write yourself. Close
the documentation box and continue.
C programs begin with main
NULL is a macro for a zero pointer
main(){
write to SPCR register to
initialize parallel port A
WrPortI(SPCR,NULL,0x84);
Write all 1’s to port A
to turn off all LEDs
WrPortI(PADR,&PADRShadow,0xff);
Start a loop
while(1) {
BitWrPortI(PADR,&PADRShadow,1,2);
for(j=0; j<25000; j++);
BitWrPortI(PADR,&PADRShadow,0,2);
for(j=0; j<1000; j++);
} // end while(1)
Set bit 2 to a “1”
LED DS3 off.
Time delay by counting
to 25,000.
Set bit 2 to a “0”
turning LED DS3 on
Count to 1000 for a shorter
time delay
} //
end of main
End of the endless loop
Note: See Rabbit 2000 Microprocessor User ’s Manual
(Software Chapter) for details on the routines that read and
write I/O ports.
Figure 4. Sample Program DEMOJR1.C
To run the program DEMOJR1.C , load it with the File > Open menu, compile it using the
Compile menu, and then run it by selecting Run in the Run menu. The LED on the
Development Board should start flashing if everything went well. If this doesn’t work
review the following points.
? The target should be ready, which is indicated by the message “BIOS successfully com-
piled...” If you did not receive this message or you get a communication error, recom-
pile the BIOS by typing <Ctrl-Y> or select Recompile BIOS from the Compile menu.
? A message reports that “No Rabbit processor detected” in cases where the BL1810 and
Prototyping Board are not connected together, the wall transformer is not connected, or
is not plugged in. (The red power LED lights whenever power is connected.)
18
Rabbit 2000 Development Kit
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