This code example demonstrates the transmission of data by Memory-DMA (M-DMA) 2D transfer, shows its operation, initial setting, and interrupt handling.
Provide feedback on this code example.
- ModusToolbox™ v3.4 or later (tested with v3.4)
- Board support package (BSP) minimum required version: 1.0.0
- Programming language: C
- Associated parts: TRAVEO™ T2G family Cluster series
- GNU Arm® Embedded Compiler v11.3.1 (
GCC_ARM) – Default value ofTOOLCHAIN - Arm® Compiler v6.22 (
ARM) - IAR C/C++ Compiler v9.50.2 (
IAR)
- TRAVEO™ T2G Cluster 6M Lite Kit (
KIT_T2G_C-2D-6M_LITE) – Default value ofTARGET
This example uses the board's default configuration. See the kit user guide to ensure that the board is configured correctly.
See the ModusToolbox™ tools package installation guide for information about installing and configuring the tools package.
Install a terminal emulator if you do not have one. Instructions in this document use Tera Term.
This example requires no additional software or tools.
The ModusToolbox™ tools package provides the Project Creator as both a GUI tool and a command line tool.
Use Project Creator GUI
-
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)
-
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
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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-ce241259-mdma-2d-transfer" application with the desired name "Mdma2dtransfer" configured for the KIT_T2G_C-2D-6M_LITE BSP into the specified working directory, C:/mtb_projects:
project-creator-cli --board-id KIT_T2G_C-2D-6M_LITE --app-id mtb-example-ce241259-mdma-2d-transfer --user-app-name Mdma2dtransfer --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 cloneandmake getlibscommands 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).
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).
Arm® Keil® µVision®
Double-click the generated {project-name}.cprj file to launch the Keil® µVision® IDE.
For more details, see the Arm® 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).
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Connect the board to your PC using the provided USB cable through the KitProg3 USB connector
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Open a terminal program and select the KitProg3 COM port. Set the serial port parameters to 8N1 and 115200 baud
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Program the board using one of the following:
Using Eclipse IDE
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Select the application project in the Project Explorer
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In the Quick Panel, scroll down, and click <Application Name> Program (KitProg3_MiniProg4)
In other IDEs
Follow the instructions in your preferred IDE.
Using CLI
From the terminal, execute the
make programcommand 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 -
-
After programming, the application starts automatically. Press user button1 to transfer data. Confirm that the messages are displayed on the UART terminal.
Figure 1. Terminal output on program startup
You can debug the example to step through the code.
In Eclipse IDE
Use the <Application Name> Debug (KitProg3_MiniProg4) configuration in the Quick Panel. For details, see the "Program and debug" section in the Eclipse IDE for ModusToolbox™ user guide.
In other IDEs
Follow the instructions in your preferred IDE.
This design consists of M-DMA, a user button1. The M-DMA is set to initiate transfers by software triggers. Pressing the user button1 generates an interrupt. When an interrupt occurs, M-DMA transfer is triggered by software. Then, M-DMA transfers data from a source address to a destination address.
The transmitted data are composed of 16 bytes on code flash memory and transferred to UART TX FIFO using 2D transfer in descriptor. The terminal software connected to the KitProg3 COM port will print out the data transferred.
This 2D transfer is configured as do X-loop four times and Y-loop is configured as do four times by one trigger.
STDOUT
At all steps, current information is printed onto UART and can be read via the terminal program.
Initialization of the GPIO for UART is done in the cy_retarget_io_init() function.
- Initializes the pin specified by CYBSP_DEBUG_UART_TX as UART TX and the pin specified by CYBSP_DEBUG_UART_RX as UART RX (these pins are connected to the KitProg3 COM port)
- The serial port parameters are 8N1 and 115200 baud
M-DMA
To configure M-DMA, the Device Configurator is used.
Figure 2. Device configurator for M-DMA
As a resource, the "DMA Controller" is chosen, which is synonymous with M-DMA. "DMA DataWire 0" and "DMA DataWire 1" reflect the two P-DMA controllers available on this device.
When configuring the DMA, specify Trigger Input, which is used to trigger other peripherals via the trigger multiplexer available on TRAVEO™ T2G MCU. In this example, the transfer is started in GPIO interrupt by pressing user button1.
Further, specify one or multiple descriptors. A descriptor is a small part of memory for the DMA to keep track of the current state (like the current source address). As descriptor chaining is supported, specify more than one. In this example, only one is used.
In the descriptor configuration, only the data transfer width is important in this example because 32-bit words are used.
In the X-loop settings, four elements are specified to transfer. In the Y-loop settings, the number of X-loops is set to 4. Then the source address and destination address are incremented three times from their initial values. As a result, this transfers a total of 16 bytes of data from the source address on code flash to the destination address on SRAM as shown in Figure 2.
The configuration is stored in flash because it will not be changed in the code.
When finished, the configurator provides the following values:
- MDMA_Descriptor_0 of type cy_stc_dmac_descriptor_t
- MDMA_Descriptor_0_config of type cy_stc_dmac_descriptor_config_t
- MDMA_CHANNEL of type cy_stc_dmac_channel_config_t
- MDMA_HW macro
- MDMA_CHANNEL macro
The above have to be used in conjunction with the right functions, as demonstrated in the code.
Trigger DMA via software
To start the DMA transfer via software, manually trigger via Trigger Multiplexer (TrigMUX). In the PDL, the Cy_TrigMux_SwTrigger() function is available. See the device datasheet for the trigger line corresponding to the used DMA channel.
Transfer finish
To see if the transfer is finished, check the status via Cy_DMAC_Channel_GetInterruptStatusMasked() by CY_DMAC_INTR_COMPLETION.
| Resources | Links |
|---|---|
| Application notes | AN235305 – Getting started with TRAVEO™ T2G family MCUs in ModusToolbox™ AN220191 – How to use direct memory access (DMA) controller in TRAVEO™ T2G family |
| Code examples | Using ModusToolbox™ on GitHub |
| Device documentation | TRAVEO™ T2G MCU family datasheets TRAVEO™ T2G MCU family architecture and registers reference manuals |
| Development kits | Select your kits from the Evaluation board finder |
| Libraries on GitHub | mtb-pdl-cat1 – Peripheral Driver Library (PDL) retarget-io – Utility library to retarget STDIO messages to a UART port |
| 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 |
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.
Document title: CE241259 – PDL: M-DMA 2D transfer
| Version | Description of change |
|---|---|
| 1.0.0 | New code example |
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