README.md

# XMC™ MCU: ERU EXTINT

This code example demonstrates an event request unit (ERU) external interrupt on [XMC™ MCU evaluation kits](#supported-kits-make-variable-target).

An external signal is fed into the ERU using a GPIO pin. A service request interrupt is generated based on the falling edge of the external signal. An LED is toggled inside the ERU interrupt service routine (ISR).

## Requirements

- [ModusToolbox™ software](https://www.infineon.com/products/modustoolbox-software-environment) v3.0
- [SEGGER J-Link software](https://www.segger.com/downloads/jlink/#J-LinkSoftwareAndDocumentationPack)
- Programming language: C
- Associated parts: All [XMC™ MCU](https://www.infineon.com/cms/en/product/microcontroller/32-bit-industrial-microcontroller-based-on-arm-cortex-m/) parts

## Supported toolchains (make variable 'TOOLCHAIN')

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

## Supported kits (make variable 'TARGET')

- [XMC1100 boot kit](https://www.infineon.com/cms/en/product/evaluation-boards/kit_xmc11_boot_001/) (`KIT_XMC11_BOOT_001`)
- [XMC1200 boot kit](https://www.infineon.com/cms/en/product/evaluation-boards/kit_xmc12_boot_001/) (`KIT_XMC12_BOOT_001`)
- [XMC1300 boot kit](https://www.infineon.com/cms/en/product/evaluation-boards/kit_xmc13_boot_001/) (`KIT_XMC13_BOOT_001`)
- [XMC1400 boot kit](https://www.infineon.com/cms/en/product/evaluation-boards/kit_xmc14_boot_001/) (`KIT_XMC14_BOOT_001`) - Default value of `TARGET`
- [XMC4200 Platform2Go kit](https://www.infineon.com/cms/en/product/evaluation-boards/kit_xmc_plt2go_xmc4200/) (`KIT_XMC_PLT2GO_XMC4200`)
- [XMC4300 relax EtherCAT kit](https://www.infineon.com/cms/en/product/evaluation-boards/kit_xmc43_relax_ecat_v1/) (`KIT_XMC43_RELAX_ECAT_V1`)
- [XMC4400 Platform2Go kit](https://www.infineon.com/cms/en/product/evaluation-boards/kit_xmc_plt2go_xmc4400/) (`KIT_XMC_PLT2GO_XMC4400`)
- [XMC4500 relax kit](https://www.infineon.com/cms/en/product/evaluation-boards/kit_xmc45_relax_v1/) (`KIT_XMC45_RELAX_V1`)
- [XMC4700 relax kit](https://www.infineon.com/cms/en/product/evaluation-boards/kit_xmc47_relax_v1/) (`KIT_XMC47_RELAX_V1`)
- [XMC4800 relax EtherCAT kit](https://www.infineon.com/cms/en/product/evaluation-boards/kit_xmc48_relax_ecat_v1/) (`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:

<details open><summary><b>In Eclipse IDE for ModusToolbox&trade; software</b></summary>

1. Click the **New Application** link in the **Quick Panel** (or, use **File** > **New** > **ModusToolbox Application**). This launches the [Project Creator](https://www.infineon.com/dgdl/Infineon-ModusToolbox_Project_Creator_Guide_3-UserManual-v01_00-EN.pdf?fileId=8ac78c8c7d718a49017d99bcabbd31e5) tool.

2. 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](https://www.infineon.com/dgdl/Infineon-ModusToolbox_Library_Manager_User_Guide_3-UserManual-v01_00-EN.pdf?fileId=8ac78c8c7d718a49017d99ab34b831ce) 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.

3. In the **Project Creator - Select Application** dialog, choose the example by enabling the checkbox.

4. (Optional) Change the suggested **New Application Name**.

5. 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.

6. Click **Create** to complete the application creation process.

For more details, see the [Eclipse IDE for ModusToolbox&trade; software user guide](https://www.infineon.com/dgdl/Infineon-Eclipse_IDE_for_ModusToolbox_User_Guide_1-UserManual-v01_00-EN.pdf?fileId=8ac78c8c7d718a49017d99bcb86331e8) (locally available at *{ModusToolbox&trade; software install directory}/ide_{version}/docs/mt_ide_user_guide.pdf*).

</details>

<details open><summary><b>In command-line interface (CLI)</b></summary>

ModusToolbox&trade; 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&trade; 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&trade; software installation instead of a standard Windows command-line application. This shell provides access to all ModusToolbox&trade; 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](https://github.com/Infineon?q=bsp-manifest&type=&language=&sort=) manifest | Required
`--app-id`   | Defined in the `<id>` field of the [CE](https://github.com/Infineon?q=ce-manifest&type=&language=&sort=) 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

<br>

The following example will clone the "[ERU EXTINT](https://github.com/Infineon/mtb-example-xmc-eru-extint)" application with the desired name "ERU_EXTINT" 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-eru-extint --user-app-name ERU_EXTINT --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&trade; software user guide](https://www.infineon.com/dgdl/Infineon-ModusToolbox_2.4_User_Guide-Software-v01_00-EN.pdf?fileId=8ac78c8c7e7124d1017ed97e72563632) (locally available at *{ModusToolbox&trade; software install directory}/docs_{version}/mtb_user_guide.pdf*).

</details>

<details open><summary><b>In third-party IDEs</b></summary>

**Note:** Only VS Code is supported.

1. Follow the instructions from the **In command-line interface (CLI)** section to create the application, and import the libraries using the `make getlibs` command.

2. 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&trade; software user guide](https://www.infineon.com/dgdl/Infineon-ModusToolbox_2.4_User_Guide-Software-v01_00-EN.pdf?fileId=8ac78c8c7e7124d1017ed97e72563632) (locally available at *{ModusToolbox&trade; software install directory}/docs_{version}/mtb_user_guide.pdf*).

3. Follow the instructions displayed in the terminal to create or import the application as an IDE project.

</details>

## Operation

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

2. Program the board using Eclipse IDE for ModusToolbox&trade; software:

   1. Select the application project in Project Explorer.

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

3. Confirm the operation of the example:

   1. If using the XMC1100 boot kit, connect an external jumper wire at ports Pin P2.5 and 3V3. Confirm that the user LED toggles when a connection is made and broken between 3V3 and the P2.5 port pin.

      See the XMC1100 boot kit board user manual for details of port pins.

   2. If using an XMC1200/XMC1300/XMC1400 boot bit, confirm that the user LED toggles when the knob of the potentiometer (on P2.5) is turned clockwise and counter-clockwise.

      See the respective XMC1000 boot kit board user manual for details of potentiometer connections.

   3. If using an XMC4400/XMC4700/XMC4800 kit, connect an external jumper wire at P1.15 and 3V3 of connector X1 or X2 of the evaluation kit. Confirm that the user LED toggles when a connection is made and broken between 3V3 and the P1.15 port pin.

      See the respective XMC4000 kit board user manual for details of port pins.

   4. If using the XMC4200 Platform2Go kit, use **Button1** connected to the P1.15 port pin. Confirm that the user LED toggles when **Button1** is pushed and released.

      See the XMC4200 kit board user manual for details of port pins.

   5. If using the XMC4300 EtherCAT kit, connect an external jumper wire at P2.3 and 3V3. Confirm that the user LED toggles when a connection is made and broken between 3V3 and the P2.3 port pin.

      See the XMC4300 kit board user manual for details of port pins.
   
   6. If using the XMC4500 relax kit, use **Button2** connected to the P1.15 port pin. Confirm that the user LED toggles when **Button2** is pushed and released.

      See the XMC4500 kit board user manual for details of port pins.


## 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&trade; software user guide](https://www.infineon.com/dgdl/Infineon-Eclipse_IDE_for_ModusToolbox_User_Guide_1-UserManual-v01_00-EN.pdf?fileId=8ac78c8c7d718a49017d99bcb86331e8).


## Design and implementation

Port pin P2.5 is configured as an input port for the XMC1100/XMC1200/XMC1300/XMC1400 boot kit by the device configurator as follows:

**Figure 1. P2.5 Configuration**

![](images/xmc_port.png)


The default port configuration is used for all XMC4000 kits.

The XMC1100/XMC1200/XMC1300/XMC1400/XMC4300 kit uses ERU group0 with the event trigger logic on channel 1 (`ERU0_ETL1`) while XMC4200/XMC4400/XMC4500/XMC4700/XMC4800 kit uses ERU group1 with the event trigger logic on channel 1 (`ERU1_ETL1`). The output gating unit (`ERU_OGU`) is configured for service requests on the external trigger input.

The main loop waits for the occurrence of an external signal; with falling edge detection, an interrupt is generated by the ERU and the user LED is toggled inside the ISR.

## Related resources

Resources  | Links
-----------|----------------------------------
Code examples  | [Using ModusToolbox&trade; software](https://github.com/Infineon/Code-Examples-for-ModusToolbox-Software) on GitHub
Device documentation | [XMC4000 family datasheets](https://www.infineon.com/cms/en/product/microcontroller/32-bit-industrial-microcontroller-based-on-arm-cortex-m/32-bit-xmc4000-industrial-microcontroller-arm-cortex-m4/#document-group-myInfineon-49) <br> [XMC4000 family technical reference manuals](https://www.infineon.com/cms/en/product/microcontroller/32-bit-industrial-microcontroller-based-on-arm-cortex-m/32-bit-xmc4000-industrial-microcontroller-arm-cortex-m4/#document-group-myInfineon-44) <br> [XMC1000 family datasheets](https://www.infineon.com/cms/en/product/microcontroller/32-bit-industrial-microcontroller-based-on-arm-cortex-m/32-bit-xmc1000-industrial-microcontroller-arm-cortex-m0/#document-group-myInfineon-49) <br> [XMC1000 family technical reference manuals](https://www.infineon.com/cms/en/product/microcontroller/32-bit-industrial-microcontroller-based-on-arm-cortex-m/32-bit-xmc1000-industrial-microcontroller-arm-cortex-m0/#document-group-myInfineon-44)
Development kits | [XMC&trade; eval boards](https://www.infineon.com/cms/en/product/microcontroller/32-bit-industrial-microcontroller-based-on-arm-cortex-m/#boards)
Libraries on GitHub  | [mtb-xmclib-cat3](https://github.com/Infineon/mtb-xmclib-cat3) – XMC&trade; peripheral driver library (XMCLib)
Tools  | [Eclipse IDE for ModusToolbox&trade; software](https://www.infineon.com/cms/en/design-support/tools/sdk/modustoolbox-software) – ModusToolbox&trade; 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&trade; 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&trade; MCU devices, see [32-bit XMC™ industrial microcontroller based on Arm® Cortex®-M](https://www.infineon.com/cms/en/product/microcontroller/32-bit-industrial-microcontroller-based-on-arm-cortex-m/).

## Document history

Document title: *CE232792* - *XMC&trade; MCU: ERU EXTINT*

| Version | Description of change |
| ------- | --------------------- |
| 1.0.0   | New code example      |
| 1.1.0   | Added support for new kits |
| 2.0.0   | Added support for ERU personality & Updated to support ModusToolbox™ software v3.0; CE will not be backwards compatible with previous versions of ModusToolbox™ software |
| 2.0.1   | Updated README        |
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