ModusToolbox SegLCD Configurator Guide


The Segment LCD (SegLCD) Configurator is a stand-alone tool included with the ModusToolbox software and used to generate display structures for the SegLCD Driver. The tool is supported on Windows, Linux, and macOS.


The SegLCD Configurator supports the following types of displays:

  • bar graph (1pixel per symbol)

  • 7-segment

  • 14-segment

  • 16-segment

  • 5x8 dot matrix (40 pixels per symbol)

See the Display Editor section for more information about display types.

Supported Software




Cypress PSoC 6 Peripheral Driver Library

1.3.1 and later /cypresssemiconductorc o/psoc6pdl


  • LCD – Liquid Crystal Display

  • Glass – An LCD glass with one or more displays (for example, one 7-segment display and one bar-graph display).

  • Display – A block of symbols that have the same type on an LCD glass to indicate a multi-digital number or character string.

  • Symbol – A block of pixels on an LCD glass to indicate a single digit or character.

  • Pixel – A basic displaying item. This can be a segment of a 7-segment symbol (thus called a “segment”), a pixel of a dot-matrix display, or a stand-alone arbitrarily-shaped display element. Each pixel has a unique set of common and segment lines within one LCD glass.

  • Common line (Com/COM for short) – A common wire/signal from the PSoC MCU to the LCD glass. In the SegLCD Configurator, this is represented as a column in the Mapping Table.

  • Segment line (Seg/SEG for short) – A segment wire/signal from the PSoC MCU to the LCD glass. In the SegLCD Configurator, this is represented as a row in the Mapping Table.

Launch the SegLCD Configurator

You can launch the SegLCD Configurator various ways: as a stand-alone tool, from the Device Configurator, from the Eclipse IDE for ModusToolbox or from the command line. Then, you can either use the generated source with an Eclipse IDE application, or use it in any software environment you choose.

As a Stand-Alone Tool

You can launch the SegLCD Configurator as a stand-alone tool. By default, it is installed here:


On Windows, you can launch the tool from the Start menu.

For other operating systems, navigate to the install location and run the executable.

When opened this way, the SegLCD Configurator GUI opens with an untitled configuration file (*.cyseglcd). Save it as a new file and provide a file name, or open another existing *.cyseglcd file.


From the Device Configurator

You can also launch the SegLCD Configurator from the Device Configurator. Refer to the Device Configurator Guide for more details.

  1. On the Device Configurator Peripherals tab, enable the LCD Direct Drive resource.

  2. On the Parameters pane, click the Launch SegLCD Configurator button to launch the SegLCD Configurator.


The Device Configurator displays information based on the design.modus file and various enabled personalities. When you open the SegLCD Configurator from the Device Configurator, information about the device and the application is passed to the SegLCD Configurator. When you save changes in the SegLCD Configurator, it

updates/generates a design.cyseglcd configuration file in the same location as the design.modus file. All Board Support Package (BSP) configurators also generate/update firmware in the BSP’s “GeneratedSource” folder.

From the Eclipse IDE

If you are using the Eclipse IDE included with ModusToolbox, you can launch the SegLCD Configurator by right- clicking on a project in the Project Explorer and selecting ModusToolbox > SegLCD Configurator. Or you can use the IDE Quick Panel. Refer to the Eclipse IDE for ModusToolbox User Guide for more details.

Launching the SegLCD Configurator from the IDE is similar to opening from the Device Configurator, because the SegLCD configuration file (design.cyseglcd) will be related to the design.modus file in the BSP.

From the Command Line

You can run the seglcd-configurator executable from the command line. However, there are only a few reasons to do this in practice. There is also a seglcd-configurator-cli executable which re-generates source code based on

the latest configuration settings from a command-line prompt or from within batch files or shell scripts. The exit code for the seglcd-configurator-cli executable is zero if the operation is successful, or non-zero if the operation encounters an error. To use the seglcd-configurator-cli executable, provide at least the –-config argument with a path to the configuration file.

For more information about command-line options, run the seglcd-configurator or seglcd-configurator-cli executable using the -h option.

Quick Start

This section provides a simple workflow for how to use the tool.

  1. Launch the SegLCD configurator.

  2. Click the Edit Displays button on the toolbar to open the Display Editor dialog.


  3. On the Display Editor dialog, click the Add New Display button.


  4. A new row appears to specify the display Name, select the Type, and specify the number of Symbols. See the Display Editor section for more information.


  5. Close the dialog by clicking the X button or pressing [Esc].

  6. On the toolbar, specify the number of Common and Segment LCD connections corresponding to the mapping table dimensions. See the Mapping Table section for more information.


  7. On the display view, left-click and hold a pixel of the symbol, drag it onto the mapping table below the display view, and release the mouse button on the desired cell. See the Mapping Table section for more information.


  8. Repeat this process for all display pixels.

  9. Save the configuration.

    See Code Generation.

Code Generation

The SegLCD Configurator generates code in the “GeneratedSource” directory in your BSP, or in the location you specified for a non-Eclipse IDE application. That directory contains the source (.c) and header (.h) files with relevant firmware used by the SegLCD driver. The configuration is stored in the design.cyseglcd file next to the design.modus file.

After saving the configuration and closing the SegLCD Configurator, complete the configuration:

  • If you launched the SegLCD Configurator from the Device Configurator, assign all the unassigned LCD terminals to the GPIO pins in the Device Configurator.

  • If you launched the SegLCD Configurator independently, edit the generated code to provide additional LCD terminal definitions for the display array.

GUI Description


The toolbar contains the same commands as the File menu. The toolbar also contains:

  • Commons – Specifies the number of common LCD connections represented as columns on the mapping table.

  • Segments – Specifies the number of segment LCD connections represented as rows on the mapping table.

  • Edit displays – Opens the Display Editor dialog.

  • Undo – Undoes the last action or sequence of actions.

  • Redo – Redoes the last undone action or sequence of undone actions.

Display Editor

Use this dialog to create and configure displays.


You can open the Display Editor dialog using any of the following ways:

  • Click the Edit button on the

  • Click the Edit Displays button on the toolbar

  • Keyboard shortcut applicable to the OS. You can close it multiple ways as well:

  • Click the X button.

  • Keyboard shortcut applicable to the OS.

Display Editor Toolbar

This dialog contains the following toolbar commands:

  • image10 Add New Display – Adds a display row to the dialog and a tab to the Display View.

  • image11 Delete Display – Deletes the selected display row from the dialog and removes the tab from the Display View.

  • image12 Move Up/Down – Moves the selected display row up or down in the dialog, and accordingly rearranges the order of the tabs in the Display View.

Display Row

Use the fields in the display row to enter the display Name, select the Type, and specify the number of Symbols. Use the [Tab] key to switch between the fields, as needed, or select the field using the mouse.


Shows the names of configured displays: Display0, Display1, etc. Each name is unique. It may contain upper or lowercase letters, underscores, and digits. However, the first character cannot be a digit.


Shows the types of displays to select from the pull-down menu:

  • Bar/Dial Graph – Consists of 2 or more pixels. The number of pixels (the bar graph length) is defined by the Symbols parameter. On the firmware layer, this type is considered as a non-symbolic display with one pixel per symbol. It supports up to 255 segments.


  • 7-Segment Display – Consists of 7 segments per symbol.


  • 14-Segment Display – Consists of 14 segments per symbol.


  • 16-Segment Display – Consists of 16 segments per symbol.



    A decimal point/apostrophe/colon, or any other sign besides the segment display symbol, is not supported as a part of the symbol itself. These signs can be treated as stand-alone pixels.

  • Matrix Display – For a symbol sized 5 (width) x 8 (height) pixels.



The number of display types to include on the corresponding Display View tab.

Display View

The display view contains one or more tabs that show display types configured in the Display Editor.


A display symbol contains a set of pixels named A, B, C… (or 00, 01, 02 for the matrix display type) by default. The pixel names correspond to cell names in the Mapping Table (for a pixel placed on the mapping table). The pixels have colors showing the connectivity status:

  • Light Green – The pixel is connected, and the symbol is currently selected.

  • Dark Green – The pixel is connected, and the symbol is currently not selected.

  • Blue – The pixel is currently selected (connected or not).

  • White – The pixel is not connected, and the symbol is currently selected.

  • Grey – The pixel is not connected, and the symbol is not currently selected.


  • The same colors are used for pixels in the mapping table, when applicable.

  • In this document, symbol segments for displays (for example, 7-segment, 14-segment, etc.), are called “pixels” so that they are not confused with segment LCD connections (physical wires) represented as rows of the mapping table (see Definitions).

Mapping Table

The mapping table (below the Display View) is a grid control where columns represent Commons lines, rows represent Segments lines, and cells represent pixels. Each pixel is determined by a unique pair of common and segment lines.


Connect/Disconnect Display Pixel

To connect a display pixel to a specific Common and Segment, drag a pixel from the Display View to the mapping table.


You can also right-click on the cell to access the context menu and select the desired display, symbol, and pixel.


To disconnect a display pixel, select a pixel in the table and drag the selected pixel outside the mapping table. You can also simply press Delete.

Change Pixel Name

When a new file opens on the SegLCD GUI, all the cells in the mapping table are labelled as “Unused”.

If the user names an unconnected pixel from the mapping table, a define is added to the generated header file. For example,

#define <Peripheral instance name>_<User defined pixel name> (CY_SEGLCD_PIXEL( <Common number>UL, <Segment number>UL))

By default, display pixels connected to Commons and Segments in the mapping table have the following name format:

<display name>_<symbol number>_<pixel name>

To rename a pixel, double-click it in the mapping table to select it, and then replace the text. Each pixel name must be unique. The name can contain uppercase and lowercase letters, underscores, and digits. However, the first character cannot be a digit.


Once the name has been changed, only the first two characters of the pixel name show in the display name.

To return a pixel name to its default value, either delete the name and press [Enter] or select the name and type “Unused”.

Notice List

The Notice List pane combines notices (errors, warnings, tasks, and notes) from many places in the configuration into a centralized list. If a notice shows a location, double-click the entry to show the error or warning.


For more information, refer to the Device Configurator Guide.


Refer to the following documents for more information, as needed:

Version Changes

This section lists and describes the changes for each version of this tool.


Change Descriptions


New tool.


Added the Undo / Redo feature.


Updated versioning to support patches.

Added Copy feature to the Notice List.

Changed unused pixels’ names from “PIX{№}” to “Unused” in the mapping table.

Fixed the colors in DarkMode.

Added the correct error location in the Notice List.


Updated versioning to support the updated backend.


Removed the command-line generate options: -g and –generate.