XMC™ MCU: Analog comparator

This code example demonstrates the usage of the analog comparator (ACMP) peripheral of XMC™ MCU.

The comparator block (ANACMP-1) is configured to receive a divided reference voltage on the positive input (IN-P) pin. You can then modify the voltage to the negative input (IN-N) pin (Port 2.6) and watch the user LED toggle according to the change in ANACMP1:CMP_OUT.

Requirements

ModusToolbox™ software v3.0
SEGGER J-Link software
Programming language: C
Associated parts: All XMC1000 MCU parts

Supported toolchains (make variable 'TOOLCHAIN')

GNU Arm® embedded compiler v10.3.1 (GCC_ARM) - Default value of TOOLCHAIN

Supported kits (make variable 'TARGET')

XMC1200 boot kit (KIT_XMC12_BOOT_001)
XMC1300 boot kit (KIT_XMC13_BOOT_001)
XMC1400 boot kit (KIT_XMC14_BOOT_001) - Default value of TARGET

Hardware setup

This example uses the board's default configuration. See the kit user guide to ensure that the board is configured correctly.

Software setup

Install a terminal emulator if you don't have one. Instructions in this document use Tera Term.

This example requires no additional software or tools.

Using the code example

Create the project and open it using one of the following:

In Eclipse IDE for ModusToolbox™ software

Click the New Application link in the Quick Panel (or, use File > New > ModusToolbox Application). This launches the Project Creator tool.
Pick a kit supported by the code example from the list shown in the Project Creator - Choose Board Support Package (BSP) dialog.

When you select a supported kit, the example is reconfigured automatically to work with the kit. To work with a different supported kit later, use the Library Manager to choose the BSP for the supported kit. You can use the Library Manager to select or update the BSP and firmware libraries used in this application. To access the Library Manager, click the link from the Quick Panel.

You can also just start the application creation process again and select a different kit.

If you want to use the application for a kit not listed here, you may need to update the source files. If the kit does not have the required resources, the application may not work.
In the Project Creator - Select Application dialog, choose the example by enabling the checkbox.
(Optional) Change the suggested New Application Name.
The Application(s) Root Path defaults to the Eclipse workspace which is usually the desired location for the application. If you want to store the application in a different location, you can change the Application(s) Root Path value. Applications that share libraries should be in the same root path.
Click Create to complete the application creation process.

For more details, see the Eclipse IDE for ModusToolbox™ software user guide (locally available at {ModusToolbox™ software install directory}/ide_{version}/docs/mt_ide_user_guide.pdf).

In command-line interface (CLI)

ModusToolbox™ software provides the Project Creator as both a GUI tool and the command line tool, "project-creator-cli". The CLI tool can be used to create applications from a CLI terminal or from within batch files or shell scripts. This tool is available in the {ModusToolbox™ software install directory}/tools_{version}/project-creator/ directory.

Use a CLI terminal to invoke the "project-creator-cli" tool. On Windows, use the command line "modus-shell" program provided in the ModusToolbox™ software installation instead of a standard Windows command-line application. This shell provides access to all ModusToolbox™ software tools. You can access it by typing modus-shell in the search box in the Windows menu. In Linux and macOS, you can use any terminal application.

This tool has the following arguments:

Argument	Description	Required/optional
`--board-id`	Defined in the `<id>` field of the BSP manifest	Required
`--app-id`	Defined in the `<id>` field of the CE manifest	Required
`--target-dir`	Specify the directory in which the application is to be created if you prefer not to use the default current working directory	Optional
`--user-app-name`	Specify the name of the application if you prefer to have a name other than the example's default name	Optional

The following example will clone the "Analog Comparator" application with the desired name "acmp" configured for the KIT_XMC14_BOOT_001 BSP into the specified working directory, C:/mtb_projects:

project-creator-cli --board-id KIT_XMC14_BOOT_001 --app-id mtb-example-xmc-acmp-cmp --user-app-name acmp --target-dir "C:/mtb_projects"

Note: The project-creator-cli tool uses the git clone and make getlibs commands to fetch the repository and import the required libraries. For details, see the "Project creator tools" section of the ModusToolbox™ software user guide (locally available at {ModusToolbox™ software install directory}/docs_{version}/mtb_user_guide.pdf).

In third-party IDEs

Note: Only VS Code is supported.

Follow the instructions from the In command-line interface (CLI) section to create the application, and import the libraries using the make getlibs command.
Export the application to a supported IDE using the make <ide> command.

For a list of supported IDEs and more details, see the "Exporting to IDEs" section of the ModusToolbox™ software user guide (locally available at {ModusToolbox™ software install directory}/docs_{version}/mtb_user_guide.pdf).
Follow the instructions displayed in the terminal to create or import the application as an IDE project.

Operation

Connect the board to your PC using a micro-USB cable through the debug USB connector.
Program the board using Eclipse IDE for ModusToolbox™ software:
1. Select the application project in Project Explorer.
2. In the Quick Panel, scroll down, and click <Application Name> Program (JLink).
Connect VDD to P2.11 (ACMP_REF pin).
Connect GND to P2.6. The LED turns ON.
Connect VDD to P2.6. The LED turns OFF.

Debugging

You can debug the example to step through the code. In the IDE, use the <Application Name> Debug (JLink) configuration in the Quick Panel. For more details, see the "Program and Debug" section in the Eclipse IDE for ModusToolbox™ user guide.

Design and implementation

This example shows how the ACMP peripheral of the XMC™ MCU works. The implementation consists of the following three steps:

Selects and configures the ACMP using the XMC_ACMP_Init() function.
Connects the divided reference 'VACMP_REF/2' to the positive input pin 'ACMP1.INP' by using the XMC_ACMP_EnableReferenceDivider() function.
Enables the ACMP by using the XMC_ACMP_EnableComparator() function.

The LED is toggled based on the reading of the comparator output and modifying the negative input pin (IN-N).

Related resources

Resources	Links
Code examples	Using ModusToolbox™ software on GitHub
Device documentation	XMC1000 family datasheets XMC1000 family technical reference manuals
Development kits	XMC™ eval boards
Libraries on GitHub	mtb-xmclib-cat3 – XMC™ peripheral driver library (XMCLib)
Tools	Eclipse IDE for ModusToolbox™ software – ModusToolbox™ software is a collection of easy-to-use software and tools enabling rapid development with Infineon MCUs, covering applications from embedded sense and control to wireless and cloud-connected systems using AIROC™ Wi-Fi and Bluetooth® connectivity devices.

Other resources

Infineon provides a wealth of data at www.infineon.com to help you select the right device, and quickly and effectively integrate it into your design.

For XMC™ MCU devices, see 32-bit XMC™ industrial microcontroller based on Arm® Cortex®-M.

Document history

Document title: CE232579 – XMC™ MCU: Analog comparator

Version	Description of change
1.0.0	New code example
1.0.1	Updated README
1.1.0	Added support for new kits
2.0.0	Updated to support ModusToolbox™ software v3.0; CE will not be backwards compatible with previous versions of ModusToolbox™ software
2.1.0	Added support for new kits and ACMP personality
2.1.1	Updated README

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All Rights Reserved.

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The information given in this document shall in no event be regarded as a guarantee of conditions or characteristics. With respect to any examples or hints given herein, any typical values stated herein and/or any information regarding the application of the device, Infineon Technologies hereby disclaims any and all warranties and liabilities of any kind, including without limitation, warranties of non-infringement of intellectual property rights of any third party.

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Infineon/mtb-example-xmc-acmp-cmp

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