Rabbit 2000, Getting Started

Getting Started Manual

11

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A message reports that “No Rabbit processor detected” in cases where the Jackrabbit 
and Prototyping Board are not connected together, the wall transformer is not con-
nected, or is not plugged in. (The red power LED lights whenever power is connected.) 

•

The programming cable must be connected to the Jackrabbit board.  (The colored wire 
on the programming cable is closest to pin 1 on header J3 on the Jackrabbit board, as 
shown in Figure 3 on page 7.)  The other end of the programming cable must be con-
nected to the PC serial port, possibly, using the 9- to 25-pin adapter if necessary. 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 one 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.

3.2  Single-Stepping

Compile or re-compile 

DEMOJR1.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.

3.2.1  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.

3.2.2  Break Point

Move the cursor to the start of the statement: 

   for(j=0; j<1000; j++);

To set a break point on this statement, type 

F2

 or select 

Breakpoint

 from the 

Run

 menu. 

A red highlight will appear on the first character of the statement.  To get the program run-
ning 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 

25000. This is because the loop above terminated when 

j

 reached 25000.

To remove the break point, type 

F2

 or select 

Toggle Breakpoint

 on the 

Run

 menu. To 

continue program execution, type 

F9

 or select 

Run

 from the 

Run

 menu. Now the LED 

should be flashing again since the program is running at full speed.