Rabbit 2000, Getting Started

12

Rabbit 2000 Development Kit

You can set break points while the program is running by positioning the cursor to a state-
ment and using the 

F2

 key.  If the execution thread hits the break point, a break point will 

take place. You can toggle the break point off with the 

F2

 key and continue execution with 

the 

F9

 key.  Try this a few times to get the feel of things.

3.2.3  Editing the Program

Click on the 

Edit

 box on the task bar.  This will set Dynamic C into the edit mode so that 

you can change the program.  Use the 

Save as

 choice on the 

File

 menu to save the file 

with a new name so as not to change the demo program.  Save the file as 

MYTEST.C

. Now 

change the number 25000 in the 

for (..

 statement to 10000.  Then use the 

F9

 key to recom-

pile and run the program.  The LED will start flashing, but it will flash much faster than 
before because you have changed the loop counter terminal value from 25000 to 10000.

3.2.4  Watching Variables Dynamically

Go back to edit mode (select edit) and load the program 

DEMOJR2.C

 using the 

File

 menu 

Open

 command.  This program is the same as the first program, except that a variable 

k

has been added along with a statement to increment 

k

 each time around the endless loop. 

The statement:

runwatch();

has been added.  This is a debugging statement that makes it possible to view variables 
while the program is running.

Use the 

F9

 key to compile and run 

DEMOJR2.C

.  Now type 

<ctrl-W>

 to open the watch 

window and add the watch expression 

k

 to the top of the list of watch expressions.  Now 

type 

<ctrl-U>

.  Each time you type 

<ctrl-U>

, you will see the current value of 

k

, which is 

incrementing about 5 times a second.

As an experiment add another expression to the watch window: 

k*5

Then type 

<ctrl-U>

 several times to observe the watch expressions 

k

 and 

k*5

.

3.2.5  Summary of Features

So far you have practiced using the following features of Dynamic C.

•

Loading, compiling and running a program.  When you load a program it appears in an 
edit window.  You can compile by selecting 

Compile

 on the task bar or from the 

Com-

pile

 menu.  When you compile the program, it is compiled into machine language and 

downloaded to the target over the serial port.  The execution proceeds to the first state-
ment of main where it pauses, waiting for you to command the program to run, which 
you can do with the 

F9

 key or by selecting 

Run

 on the 

Run

 menu.  If want to compile 

and start the program running with one keystroke, use 

F9

, the run command.  If the pro-

gram is not already compiled, the run command will compile it first.

•

Single-stepping.  This is done with the 

F8

 key. The 

F7

 key can also be used for single-

stepping.  If the 

F7

 key is used, then descent into subroutines will take place. With the 

F8

 key the subroutine is executed at full speed when the statement that calls it is 

stepped over.