User manual

ManualsBrandsMICROCHIP TECHNOLOGY ManualsDev KitsPCB design board

MPLAB

REAL ICE

™

In-Circuit Emulator User’s Guide

4. After rebuilding, a Warning dialog will ask, “File has been modified. Do you want

to reload?”. Click Yes. When you examine your code, you will find that the log id

has been replaced with a unique number.

5. Reprogram the device (Debugger>Program

6. Double-click on the following line to place a breakpoint there:

PORTA = counter; //display on port LEDs

7. Reset and run the program until it halts at the breakpoint. Repeat this three times.

8. Select View>Trace

to view the trace data (Section 11.3.11 “Trace Window”) or

right click and in the Trace window and select “Reload”. You should see variable

values logged in this window. To see the related code in the lower portion of the

window, you may need to click on a logged value in the upper portion of the win-

dow.

4.15.2 Using I/O Port Trace

You may choose to modify the Explorer 16 demo board or use a target board of your

own design to allow for access to the desired port pins. Either way, a hardware

connection between the target device’s port and the emulator’s logic probe connector

is required. See Section 2.5.3 “I/O Port Trace Connections” for details.

If you design your own board, you will also need to a connector for regular debug pins,

i.e., for either standard or high-speed communications. See Section 2.3 “Emulator

Communications with the PC and Target” for connection information.

4.15.2.1 HARDWARE SETUP

To set up the hardware to use I/O Port Trace, do the following:

1. Modify or create a target board, as specified above, so that it accommodates a

connection between the emulator and the device port.

2. Using an unpowered emulator and target board, connect the two using either

standard or high-speed communications.

3. Connect the emulator’s logic probe pins to the target device’s port pins using

logic probes or other connectors.

4. Power the emulator, and then the target board.

4.15.2.2 MPLAB IDE SETUP

To set up MPLAB IDE software to use I/O Port Trace, do the following:

1. Launch MPLAB IDE and open the project from this tutorial, if it is not already

open.

2. If the MPLAB REAL ICE in-circuit emulator is selected as the programmer, dis-

able it by selecting Programmer>Select Programmer>None

3. Enable the MPLAB REAL ICE in-circuit emulator as the debug tool by selecting

Debugger>Select Tool>REAL ICE

4. On the Project toolbar, select “Debug” from the Build Configuration drop-down

list. (For some devices, an i version of the linker script is also necessary for

debugging, e.g., 18F8722i.lkr.)

Note: To disable this warning and automatically reload, select

Configure>Settings

, Other tab, and check “Automatically reload files

that were modified outside of the IDE”. Then click OK.