Discussion 02 - AVR Butterfly with MPLAB SNAP In-Circuit Debugger

Professor Robucci

Debugger/Programmer Firmware Upgrade

It seems that everyone had to perform a firmware upgrade

You'll need a jumper wire to temporarily short J3 (mid-right-edge) when requested.
Figure 2.1 https://ww1.microchip.com/downloads/en/DeviceDoc/50002787C.pdf

In MPLAB IDE:
* Debug -> Hardware Tool Emergency Boot Firmware Recovery

Wiring Diagram

• Note, the AVR Butterfly boards used in CMPE311 have been modified (on-board soldered jumper wire) so that power can be provided to the board through the debugging port.

Switch to Hardware Debugger from Simulator

• In MPLAB IDE, change tool from Simulator to Snap-SN:<serialnumber>

In-Circuit Hardware Debugging

• Usage is similar to simulator.... breakpoints can be set, code stepping, etc...
• The inputs such as the joystick can be set by the hardware itself, yet still observed in the IO View.
  • Window-> Debugging -> IO View
• Viewing of General Purpose Registers is found here
  • Window -> Target Memory Views -> I/O Memory (SFRs)
• The programing memory along with disassembly can be viewed as before
  • Window -> Target Memory Views -> Program Memory
• You can create a custom watch view with registers (e.g. r16)
  • Window-> Debugging -> Watches