Setting Up and Using Instruction Trace

PIC32 Instruction Trace requires hardware and software setup before you can trace.

Hardware Setup – PIC32 MCU on PIM

To use the PIC32 Instruction Trace feature with the PIM do the following:

  1. Plug the PIM into an unpowered target board.
  2. Install communication cable(s) between the emulator and your target board. See Emulator Communication with the Target or the “Performance Pak User’s Guide” (DS50002528).
  3. Connect the trace cable from the trace port on the PIM to the trace adapter board. Orient the cable as show in Figure 1. For hardware details, see the “MPLAB REAL ICE Trace Interface Kit Specification” (DS50002531).
  4. Plug the trace adapter board into the MPLAB REAL ICE in-circuit emulator logic probe port. The top of the adapter board contains the connectors and should be oriented upwards when plugging the board into the logic probe port (Figure 1).
  5. Power the target.

Note: When using trace, pins TRCLK and TRD3:0 are used. Therefore, you cannot use the other functions multiplexed on these pins. For PIC32MX360F512L, multiplexed functions are RG14:12 and RA7:6. Check your device data sheet for details.

Figure 1: Trace Connection with PIM

InstructionTrace_PIM.jpg

Hardware Setup – PIC32 MCU on Target

When designing instruction trace capability onto your own board, the following provisions will need to be made.

  • Termination series resistors will need to be added. For details, see the “MPLAB REAL ICE Trace Interface Kit Specification” (DS50002531).
  • Depending on your board routing and loading of the signals used for trace, it is a good idea to place 0 ohm resistors that can be unpopulated to isolate the trace signals TRCLK and TRD3:0.

To use the PIC32 Instruction Trace feature with your own board do the following:

  1. The target board should initially be unpowered.
  2. Install communication cable(s) between the emulator and your target board. See Emulator Communication with the Target or the “Performance Pak User’s Guide” (DS50002528).
  3. Connect the trace cable from the target board to the trace adapter board. Make sure the PIC32 MCU on your target board is connected to accommodate trace, as per Figure 2. For hardware details, see “MPLAB REAL ICE Trace Interface Kit Specification” (DS50002531).
  4. Plug the trace adapter board into the MPLAB REAL ICE in-circuit emulator logic probe port. The top of the adapter board contains the connectors and should be oriented upwards when plugging the board into the logic probe port (Figure 2).
  5. Power the target.

Note: When using trace, pins TRCLK and TRD3:0 are used. Therefore, you cannot use the other functions multiplexed on these pins. For PIC32MX360F512L, multiplexed functions are RG14:12 and RA7:6. Check your device data sheet for details.

Figure 2: Trace Connection with Device on Target

InstructionTrace_Device.jpg

MPLAB X IDE Setup

To set up MPLAB X IDE to use trace for the MPLAB REAL ICE in-circuit emulator:

  1. Right-click on the project name and select Properties. In the Project Properties dialog, click on Real ICE (under “Categories”).
  2. Under “Option categories”, select “Trace and Profiling”.
  3. Under “Data Collection Selection”, choose “Instruction Trace/Profiling”.
  4. Set up any other trace-related options. (See Trace Configuration Options.)
  5. Click OK.

On a Debug Run, trace will continue to fill the trace buffer with data, rolling over when the buffer is full, until a program Halt.

Viewing Trace Data

When trace is enabled and code is run, trace data will be collected by the emulator. Once the device is halted, trace data will be decoded and displayed in the Trace window (Window > Debugging > Trace).

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