Recorder

Recorder#

The recorder module allows visualization of very high-speed signals, even on low-cost targets or when SWD communication speed is limited due to galvanic isolators or long cables. It is more intrusive than using a sampling group, as it must be compiled into your project-although the runtime penalty is usually minimal.

../../_images/RecorderDemo.gif

Recorder setup#

  • Copy the recorder folder from the downloaded MCUViewer *.zip file to your project. The recorder module on the target side consists of three files:

    • recorder.c

    • recorder.h

    • recorderDefines.h

  • Add the recorder folder to the build system.

  • Modify the recorderDefines.h file to match your system configuration.

  • Call recorderStep() function at the end of your high-frequency interrupt. Make sure the recorderStep() function cannot be preempted by other interrupts.

  • Compile the project and add select the *.elf file in the Options->Acquisition window.

  • Select the debug probe.

  • Enable the recorder module by ticking the “Recorder” checkbox (1) in the Options->Acquisition window.

  • Click the Detect recorder button (2). If it is detected correctly there should be no errors, just a Recorder detected! information with all fields filled in as in the recorderDefines.h file.

In case of errors please first see the FAQ section.

../../_images/RecorderSettings.png

Recorder usage#

After successful setup it is now possible to add a new recorder group. Proceed to the Plot group tree section, right click and select New->Recorder group.

  1. Mode - similarly to how oscilloscope works. Auto will continuously collect and display data, Normal will display data on each trigger occurrence, Single will display data only once for trigger occurrence.

  2. Source - select the variable that will be used as a trigger signal.

  3. Edge - Rising will display data on the rising edge, Falling will display data on the falling edge.

  4. Downsample - collect every Xth sample, allowing a longer acquisition window at the cost of reduced sampling rate.

  5. Trigger level drag line - use to set up the trigger level. If not visible, double-left-click on plot area to adjust zoom.

  6. Pretrigger drag line - use to set up the amount of pre-trigger data. If not visible, double-left-click on plot area to adjust zoom.

../../_images/RecorderUsage.png

Warning

Currently post-processed variables (for example error bits) cannot be used as trigger source.

Contents