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µVision User's Guide

About µVision User Interface Creating Applications Debugging Start Debugging Start Energy Measurement without Debug Application Program Execution Debug Windows and Dialogs Breakpoints Window Call Stack and Locals Window Code Coverage Command Window Component Viewer Disassembly Window Editor Window Event Recorder Setup Event Recorder Event Recorder Window Events Filtering Event Statistics Window Post-mortem Analysis Event Viewer Execution Profiler Instruction Trace Window System Analyzer Usage tips Save System Analyzer Contents Statistics Restrictions Logic Analyzer Setup Setup in Detail Restrictions Cortex-M Trace Configuration Memory Map Memory Window Performance Analyzer Registers Window Serial Window Debug (printf) Viewer Symbols Window System Viewer Adding System Viewer Windows System and Thread Viewer Thread States Toolbox Trace Data Window Trace Navigation Trace Exceptions Event Counters ULINKplus Window Watch Window Core Peripherals Cortex-M0 and Cortex-M0+ Nested Vector Interrupt Controller System Control and Configuration System Tick Timer Fault Reports (Cortex-M0+ only) Cortex-M3, Cortex-M4, and Cortex-M7 Nested Vector Interrupt Controller System Control and Configuration System Tick Timer Fault Reports Memory Protection Unit Cortex-M23 and Cortex-M33 Nested Vector Interrupt Controller System Control and Configuration System Tick Timer Fault Reports Memory Protection Unit Security Attribution Unit Debug Scripting Expressions Constants System Variables Peripheral Variables I/O Ports Serial Ports Program Variables (Symbols) Fully Qualified Symbols Non-Qualified Symbols Literal Symbols Using Symbols Line Numbers Bit Addresses Type Specifications Memory Attribution Specifiers Operators Differences between µVision and C Expression Examples Code and Data Trace (Cortex-M) Trace Features Configuring Trace Tracepoint Expressions Tracepoint Intrinsics Tracepoint Limitations Tracepoint Marks Tips and Tricks Review Peripherals and CPU Configuration Simulate I/O Ports Simulate Interrupts and Clock Inputs Simulate external I/O Devices Assign Serial I/O to a PC COM Port Check Illegal Memory Access Command Input from File Preset I/O Ports or Memory Contents Write Debug Output to a File Keyboard Shortcuts TPIU Initialization after RESET (Cortex-M) Prevent Opening Files Show Japanese Messages Debug Commands Debug Functions Simulation Flash Programming Dialogs Utilities Command Line Example Programs Appendix

Post-mortem Analysis

Using Event Recorder, it is possible to have a post-mortem analysis after a program failure. The function EventRecorderStop halts the filling of the Event Recorder buffer. Using it in the HardFault handler for example, enables you to connect a debugger to the target after the fault has happened to read out the last entries in the buffer. This information can then be used to find the root cause of the hard fault.

Setting up post-mortem analysis

Stop Event Recorder

In the HardFault handler, call the EventRecorderStop function:

void HardFault_Handler (void) {
  EventRecorderStop();
}

This will prevent the Event Recorder buffer being overwritten after the hard fault.

Prepare debug connection

Follow these steps to connect to an already running target:

  • Go to Project - Options for Target - Debug tab. Uncheck Load Application at Startup. Add an INI file:
    Post-mortem Analysis, Step 1
  • Open the INI file and add this command:
    LOAD %L INCREMENTAL
    
  • Press Settings of your debug adapter and disable Reset after Connect:
  • Post-mortem Analysis, Step 2
    Click OK.
  • Go to the Utilities tab and disable Update Target before Debugging:
    Post-mortem Analysis, Step 3

Start the debug session

  • Go to Debug - Start/Stop Debug Session or click Start/Stop Debug Button.
  • In the µVision debugger, go to Debug - Run or press Run Button.

The host PC will read the complete Event Recorder buffer and update the Event Recorder window.

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