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XMC™ MCU: DMA ring buffer Requirements Supported toolchains (make variable 'TOOLCHAIN') Supported kits (make variable 'TARGET') Hardware setup Software setup Using the code example Create the project Open the project Operation Debugging Design and implementation Resources and settings Related resources Other resources Document history Legal disclaimer Information Warnings
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XMC™ MCU: DMA ring buffer

This code example demonstrates how to receive data using DMA via a universal serial interface channel (USIC) and synchronize the processing with an OS task through a ring buffer.

View this README on GitHub.

Provide feedback on this code example.

Requirements

Supported toolchains (make variable 'TOOLCHAIN')

  • GNU Arm® Embedded Compiler v11.3.1 (GCC_ARM) – Default value of TOOLCHAIN

Supported kits (make variable 'TARGET')

Hardware setup

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

Additionally, an USB-to-UART serial adapter is required to test the code example on the XMC4500 Relax Kit.

Software setup

See the ModusToolbox™ tools package installation guide for information about installing and configuring the tools package.

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

The ModusToolbox™ tools package provides the Project Creator as both a GUI tool and a command line tool.

Use Project Creator GUI

  1. Open the Project Creator GUI tool.

    There are several ways to do this, including launching it from the dashboard or from inside the Eclipse IDE. For more details, see the Project Creator user guide (locally available at {ModusToolbox™ install directory}/tools_{version}/project-creator/docs/project-creator.pdf).

  2. On the Choose Board Support Package (BSP) page, select a kit supported by this code example. See Supported kits.

    Note: To use this code example 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.

  3. On the Select Application page:

    a. Select the Applications(s) Root Path and the Target IDE.

    Note: Depending on how you open the Project Creator tool, these fields may be pre-selected for you.

    b. Select this code example from the list by enabling its check box.

    Note: You can narrow the list of displayed examples by typing in the filter box.

    c. (Optional) Change the suggested New Application Name and New BSP Name.

    d. Click Create to complete the application creation process.

Use Project Creator CLI

The 'project-creator-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™ 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™ installation instead of a standard Windows command-line application. This shell provides access to all ModusToolbox™ 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 following example clones the "mtb-example-xmc-dma-ring-buffer" application with the desired name "Dma_Ring_Buffer" configured for the KIT_XMC43_RELAX_ECAT_V1 BSP into the specified working directory, C:/mtb_projects:

project-creator-cli --board-id KIT_XMC43_RELAX_ECAT_V1 --app-id mtb-example-xmc-dma-ring-buffer --user-app-name Dma_Ring_Buffer --target-dir "C:/mtb_projects"

The 'project-creator-cli' tool has the following arguments:

Argument Description Required/optional
--board-id Defined in the field of the BSP manifest Required
--app-id Defined in the 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

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™ tools package user guide (locally available at {ModusToolbox™ install directory}/docs_{version}/mtb_user_guide.pdf).

Open the project

After the project has been created, you can open it in your preferred development environment.

Eclipse IDE

If you opened the Project Creator tool from the included Eclipse IDE, the project will open in Eclipse automatically.

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

Visual Studio (VS) Code

Launch VS Code manually, and then open the generated {project-name}.code-workspace file located in the project directory.

For more details, see the Visual Studio Code for ModusToolbox™ user guide (locally available at {ModusToolbox™ install directory}/docs_{version}/mt_vscode_user_guide.pdf).

Keil µVision

Double-click the generated {project-name}.cprj file to launch the Keil µVision IDE.

For more details, see the Keil µVision for ModusToolbox™ user guide (locally available at {ModusToolbox™ install directory}/docs_{version}/mt_uvision_user_guide.pdf).

IAR Embedded Workbench

Open IAR Embedded Workbench manually, and create a new project. Then select the generated {project-name}.ipcf file located in the project directory.

For more details, see the IAR Embedded Workbench for ModusToolbox™ user guide (locally available at {ModusToolbox™ install directory}/docs_{version}/mt_iar_user_guide.pdf).

Command line

If you prefer to use the CLI, open the appropriate terminal, and navigate to the project directory. On Windows, use the command-line 'modus-shell' program; on Linux and macOS, you can use any terminal application. From there, you can run various make commands.

For more details, see the ModusToolbox™ tools package user guide (locally available at {ModusToolbox™ install directory}/docs_{version}/mtb_user_guide.pdf).

Operation

  1. Connect the board to your PC using a Micro-USB cable through the debug USB connector.

  2. Open a terminal program and select the JLink CDC UART COM port. Configure the terminal with a baud rate of 115200, data bits of 8, stop bit of 1, and with parity and flow control set to none.

  3. Program the board using one of the following:

    Using Eclipse IDE

    1. Select the application project in the Project Explorer.

    2. In the Quick Panel, scroll down, and click <Application Name> Program (JLink).

    In other IDEs

    Follow the instructions in your preferred IDE.

    Using CLI

    From the terminal, execute the make program command to build and program the application using the default toolchain to the default target. The default toolchain is specified in the application's Makefile but you can override this value manually:

    make program TOOLCHAIN=<toolchain>

    Example:

    make program TOOLCHAIN=GCC_ARM

  4. After programming, the application starts automatically. Confirm that the "DMA Ring Buffer example" is displayed on the UART terminal.

    Figure 1. DMA ring buffer example in terminal

  5. Type inside the terminal.

  6. Confirm that the text you type is echoed on the terminal.

Debugging

You can debug the example to step through the code.

In Eclipse IDE Use the **\ Debug (JLink)** configuration in the **Quick Panel**. For details, see the "Program and debug" section in the [Eclipse IDE for ModusToolbox™ user guide](https://www.infineon.com/MTBEclipseIDEUserGuide).
In other IDEs

Follow the instructions in your preferred IDE.

Design and implementation

The code consists of two parts as follows:

  • Part 1: Defines and configures the DMA channel. The source address configured in the DMA is the 'RBUF' register (XMC_UART0_CH0->RBUF), where the data should be read from. The destination address is the address of the first element in the ring buffer array ring_buffer[0]. The data received via the UART and saved in the ring buffer is echoed to the UART. This task takes over the SysTick_Handler() interrupt function, which calls the uart_transmit() function to transmit the data from the ring buffer when new data is written by the DMA to the ring buffer.

  • Part 2: Initializes and enables the DMA module in the main function using the configuration from the earlier step. It also configures the system time using the SysTick_Config() function, which calls the SysTick_Handler() function every 1 ms.

Resources and settings

The project uses a custom design.modus file because the following settings are modified in the default design.modus file.

Figure 2. USIC channel


Related resources

Resources Links
Code examples Using ModusToolbox™ on GitHub
Device documentation XMC4000 family datasheets
XMC4000 family technical reference manuals
Development kits XMC™ MCU eval boards
Libraries on GitHub mtb-xmclib-cat3 – XMC™ MCU peripheral library (XMCLib)
Tools ModusToolbox™ – ModusToolbox™ software is a collection of easy-to-use libraries and tools enabling rapid development with Infineon MCUs for applications ranging from wireless and cloud-connected systems, edge AI/ML, embedded sense and control, to wired USB connectivity using PSoC™ Industrial/IoT MCUs, AIROC™ Wi-Fi and Bluetooth® connectivity devices, XMC™ Industrial MCUs, and EZ-USB™/EZ-PD™ wired connectivity controllers. ModusToolbox™ incorporates a comprehensive set of BSPs, HAL, libraries, configuration tools, and provides support for industry-standard IDEs to fast-track your embedded application development.

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: CE232572 – XMC™ MCU: DMA ring buffer

Version Description of change
1.0.0 New code example
1.0.1 Updated README
1.1.0 Added support for more kits
2.0.0 Updated to support ModusToolbox™ v3.0. This CE is not backward compatible with previous versions of ModusToolbox™
2.1.0 Added support for DMA personality
2.1.1 Updated README
2.2.0 Updated to support ModusToolbox™ v3.1

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Legal disclaimer

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Information

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Warnings

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