XMC™ MCU: DMA PWM

This code example demonstrates the use of DMA double buffering with the PWM block. DMA writes to the compare register of the PWM to obtain a varying duty cycle at the output. Two buffers are present to provide an increasing duty cycle in one and a decreasing duty cycle in the other.

View this README on GitHub.

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Requirements

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

Supported toolchains (make variable 'TOOLCHAIN')

GNU Arm® embedded compiler v10.3.1 (GCC_ARM) - Default value of TOOLCHAIN
Arm® compiler v6.16 (ARM)
IAR C/C++ compiler v9.30.1 (IAR)

Supported kits (make variable 'TARGET')

XMC4700 relax kit (KIT_XMC47_RELAX_V1) - Default value of TARGET
XMC4200 Platform2Go kit (KIT_XMC_PLT2GO_XMC4200)
XMC4300 relax EtherCAT kit (KIT_XMC43_RELAX_ECAT_V1)
XMC4400 Platform2Go kit (KIT_XMC_PLT2GO_XMC4400)
XMC4500 relax kit (KIT_XMC45_RELAX_V1)
XMC4800 relax EtherCAT kit (KIT_XMC48_RELAX_ECAT_V1)

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

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}/docs_{version}/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.

The "project-creator-cli" 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 "DMA PWM" application with the desired name "MyDmaPWM" configured for the KIT_XMC47_RELAX_V1 BSP into the specified working directory, C:/mtb_projects:

project-creator-cli --board-id KIT_XMC47_RELAX_V1 --app-id mtb-example-xmc-dma-pwm --user-app-name MyDmaPWM --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 the Project Explorer.
2. In the Quick Panel, scroll down, and click <Application Name> Program (JLink).
Observe the signal at pin corresponding to the kit. See Table 1 for details on pin assignment. The signal should resemble the one shown in Figure 1.

Figure 1. PWM signal

Table 1. CCU4 output pin assignments

Kit Pin

XMC4700 relax kit P0.15

XMC4200 Platform2Go kit P1.3

XMC4300 relax EtherCAT kit P2.5

XMC4400 Platform2Go kit P1.3

XMC4500 relax kit P1.3

XMC4800 relax EtherCAT kit P0.15

Kit	Pin
XMC4700 relax kit	P0.15
XMC4200 Platform2Go kit	P1.3
XMC4300 relax EtherCAT kit	P2.5
XMC4400 Platform2Go kit	P1.3
XMC4500 relax kit	P1.3
XMC4800 relax EtherCAT kit	P0.15

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™ software user guide.

Design and implementation

In this project, the GPDMA is used to configure the compare register of the capture and compare unit 4 (CCU4) peripheral to obtain a waveform with varying duty cycles. DMA double buffering is used with the help of linked-list pointers. Two linked-list pointers, one with an increasing duty cycle and the other with a decreasing duty cycle, are used in this example. These values are written to the CRS register of the CCU4.

A second channel of the DMA is used to write to the shadow transfer register. Write a logic HIGH to the shadow transfer register to allow the new compare value to be loaded. Figure 2 shows the timing diagram for this operation.

Figure 2. Timing diagram

This project uses a custom design.modus file that is used to configure the CCU4 peripheral. The following changes are made in the design.modus file as shown in Figure 3.

Figure 3. CCU4 settings

Related resources

Resources	Links
Application notes	IP_CCU4_XMC-TR – Capture compare unit 4 (CCU4) - Provides an overview of the CCU4 module AP32287 – Capture compare unit 4 (CCU4) - Provides a detailed introduction to the key features of the CCU4 module
Code examples	Using ModusToolbox™ software on GitHub
Device documentation	XMC4000 MCU family datasheets XMC4000 MCU family technical reference manuals
Development kits	XMC™ MCU eval boards
Libraries on GitHub	mtb-xmclib-cat3 – XMC™ peripheral 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: CE232690 - XMC™ MCU: DMA PWM

Version	Description of change
1.0.0	New code example
1.1.0	Added support for new kits
2.0.0	Updated to support ModusToolbox™ software v3.0. This CE is not backward compatible with previous versions of ModusToolbox™software.
2.1.0	Added support for DMA personality.

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