Z-World RabbitCore 2000, Начало работы

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22 RabbitCore 2000
•
A message reports “No Rabbit Processor Detected” in cases where the RabbitCore
2000 and the 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 con-
nected.)
•
The programming cable must be connected to the RabbitCore 2000. (The colored wire
on the programming cable is closest to pin 1 on header J3 on the RabbitCore 2000, as
shown in Figure 2.) The other end of the programming cable must be connected to the
PC serial port. The COM port specified in the Dynamic C
Options menu must be the
same as the one the programming cable is connected to.
•
To check if you have the correct serial port, select
Compile
, then
Compile BIOS
, or
type <ctrl-Y> . If the “BIOS successfully compiled …” message does not display, try a
different serial port using the Dynamic C Options menu until you find the serial port
you are plugged into. Don’t change anything in this menu except the COM number.
The baud rate should be 115,200 bps and the stop bits should be 1.
4.2 Single-Stepping
Compile or re-compile
FLASHLED.C
by clicking the
Compile
button on the task bar. The
program will compile and the screen will come up with a highlighted character (green) at
the first executable statement of the program. Use the
F8
key to single-step. Each time
the
F8
key is pressed, the cursor will advance one statement. When you get to the
for(j=0, j< ...
statement, it becomes impractical to single-step further because you
would have to press
F8
thousands of times. We will use this statement to illustrate watch
expressions.
4.2.1 Watch Expression
Type <ctrl-W> or chose Add/Del Watch Expression in the Inspect menu. A box will
come up. Type the lower case letter j and click on add to top and close. Now continue
single-stepping with
F8 . Each time you step, the watch expression (
j
) will be evaluated
and printed in the watch window. Note how the value of
j
advances when the statement
j++
is executed.
4.2.2 Break Point
Move the cursor to the start of the statement:
for(j=0; j<25000; j++);
To set a break point on this statement, type
F2
or select
Toggle Breakpoint
from the
Run
menu. A red highlight will appear on the first character of the statement. To get the pro-
gram running at full speed, type
F9
or select
Run
on the
Run
menu. The program will
advance until it hits the break point. Then the break point will start flashing and show
both red and green colors. Note that LED DS3 is now solidly turned on. This is because
we have passed the statement turning on LED DS3. Note that
j
in the watch window has
the value 32000. This is because the loop above terminated when
j
reached 32000.