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Configure Logic Analyzer

Open the Logic Analyzer and select Settings from the toolstrip. A global settings dialog box opens. Any setting you change for an individual signal supersedes the global setting. The Logic Analyzer saves any setting changes with the model (Simulink®) or System object™ (MATLAB®).

Logic Analyzer settings window

Set the display Radix of your signals as one of the following:

  • Hexadecimal — Displays values as symbols from zero to nine and A to F

  • Octal — Displays values as numbers from zero to seven

  • Binary — Displays values as zeros and ones

  • Signed decimal — Displays the signed, stored integer value

  • Unsigned decimal — Displays the stored integer value

Set the display Format as one of the following:

  • Automatic — Displays floating point signals in Analog format and integer and fixed-point signals in Digital format. Boolean signals are displayed as zero or one.

  • Analog — Displays values as an analog plot

  • Digital — Displays values as digital transitions

Set the display Time Units to one of the following:

  • Automatic — Uses a time scale appropriate to the time range shown in the current plot

  • seconds

  • milliseconds

  • microseconds

  • nanoseconds

  • picoseconds

  • femtoseconds

Set the Boolean Highlighting to one of the following:

  • None

  • Rows — Adds a highlighted background for the entire Boolean signal row.

    Sample of boolean highlighting of a signal row

    Select Highlight boolean values to add highlighting to Boolean signals.

  • Gradient— Adds color highlighting to Boolean signals based on value. If the signal value is true, the highlight fades out below. If the signal value is false, the signal fades out above. With this option, you can visually deduce the value of the signal.

    Sample of gradient boolean highlighting of a signal

Set the Axes Theme to one of the following:

  • Black (default) — Set the background color of the Logic Analyzer display to black (dark).

  • White — Set the background color of the Logic Analyzer display to white (light).

  • Auto — Match the background color of the Logic Analyzer display with the MATLAB theme.

Inspect the graphic for an explanation of the global settings: Wave Color, Axes Theme, Height, Font Size, and Spacing. Font Size applies only to the text within the axes.

Annotated image of where each global setting affects the Logic Analyzer window

By default, when your simulation stops, the Logic Analyzer shows all the data for the simulation time on one screen. If you do not want this behavior, clear Fit to view at Stop. This option is disabled for long simulation times.

To display the short names of waves without path information, select Display short wave names.

You can expand fixed-point and integer signals and view individual bits. The Display Least Significant bit first option enables you to reverse the order of the displayed bits.

If you stream logged bus signals to the Logic Analyzer, you can display the names of the signals inside the bus using the Display bus element names option. To show bus element names:

  1. Add the bus signal for logging.

  2. In the Logic Analyzer settings, select the Display bus element names check box.

  3. Run the simulation.

When you expand the bus signals, you will see the bus signal names.

Sample of signal bus names

Some special situations:

  • If the signal has no name, the Logic Analyzer shows the block name instead.

  • If the bus is a bus object, the Logic Analyzer shows the bus element names specified in the Bus Object Editor.

  • If one of the bus elements contains an array, each element of the array is appended with the element index.

    Sample of signal bus element names appended with index

  • If a bus element contains an array with complex elements, the real and complex values (i) are split.

    Sample of signal bus element names appended with the index and complexity

  • Bus signals passed through a Gain block are labeled Gain(1), Gain(2),...Gain(n).

  • If the bus contains an array of buses, the Logic Analyzer prepends the element name with the bus array index.

    Sample of signal bus element names with the prepended array index