This code example demonstrates the use of a GPIO configured as an input pin to generate interrupts on PSoC™ 4. The GPIO signal interrupts the CPU and executes a user-defined interrupt service routine (ISR). The GPIO interrupt acts as a wakeup source to wake the CPU from Deep Sleep.
Provide feedback on this code example.
- ModusToolbox™ v3.1 or later (tested with v3.1)
- Board support package (BSP) minimum required version: 3.1.0
- Programming language: C
- Associated parts: PSoC™ 4000S, PSoC™ 4100S, PSoC™ 4100S Plus, PSoC™ 4500S, PSoC™ 4100S Max, and PSoC™ 4000T
- GNU Arm® Embedded Compiler v11.3.1 (
GCC_ARM) – Default value ofTOOLCHAIN - Arm® Compiler v6.16 (
ARM) - IAR C/C++ Compiler v9.30.1 (
IAR)
- PSoC™ 4100S Max Pioneer Kit (
CY8CKIT-041S-MAX) - Default value ofTARGET - PSoC™ 4100S Plus Prototyping Kit (
CY8CKIT-149) - PSoC™ 4000S CAPSENSE™ Prototyping Kit (
CY8CKIT-145-40XX) - PSoC™ 4100S CAPSENSE™ Pioneer Kit (
CY8CKIT-041-41XX) - PSoC™ 4500S Pioneer Kit (
CY8CKIT-045S) - PSoC™ 4000T CAPSENSE™ Prototyping Kit (
CY8CPROTO-040T)
This example uses the board's default configuration for all the kits listed above, except the CY8CPROTO-040T.
In order to use the User Button in CY8CPROTO-040T, short J6.2 and J6.3 with the jumper shunt on the kit. See the kit guide to ensure that the board is configured correctly.
Note: Some of the PSoC™ 4 kits ship with KitProg2 installed. ModusToolbox™ requires KitProg3. Before using this code example, make sure that the board is upgraded to KitProg3. The tool and instructions are available in the Firmware Loader GitHub repository. If you do not upgrade, you will see an error like "unable to find CMSIS-DAP device" or "KitProg firmware is out of date".
See the ModusToolbox™ tools package installation guide for information about installing and configuring the tools package.
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.
-
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-psoc4-gpio-interrupt" application with the desired name "MyGPIOInterrupt" configured for the CY8CKIT-041S-MAX BSP into the specified working directory, C:/mtb_projects:
project-creator-cli --board-id CY8CKIT-041S-MAX --app-id mtb-example-psoc4-gpio-interrupt --user-app-name MyGPIOInterrupt --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).
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).
-
Connect the kit to your PC using the provided USB cable through the KitProg3 USB connector.
-
Program the board using one of the following:
Using Eclipse IDE
-
Select the application project in the Project Explorer.
-
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.
-
Observe that the LED blinks four times and then turns OFF, indicating that the CPU has entered Deep Sleep.
-
Press the user button to trigger an interrupt. This should wake up the device, causing the LED to resume blinking at a faster rate (default = 2 Hz). The faster blink rate indicates that the ISR has executed to change the delay variable used to determine the LED blink rate. The LED blinks four times and the device enters Deep Sleep again.
-
Press the button again to repeat the wakeup cycle. The LED resumes blinking at a slower rate (default = 1 Hz). With every interrupt and execution of the ISR, the interval of blinking is alternated between slower and faster rates.
Note: The LED states are inverted for the CY8CKIT-149 kit.
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 code example uses a GPIO interrupt to wake the CPU from Deep Sleep. An LED is connected to an output pin; it is used for indicating the current state of the CPU. A blinking LED indicates that the CPU is active. After four successive blinks, the CPU is instructed to enter Deep Sleep. The GPIO state is retained during Deep Sleep, so the LED stops blinking and stays "OFF" to indicate that the CPU is in Deep Sleep.
An input pin, externally connected to a switch, is configured to generate an interrupt when the switch is pressed. The interrupt triggers the following two actions:
-
Generates a signal that wakes the CPU from Deep Sleep.
-
Executes an ISR.
When the ISR is executed, a flag is updated, which is used to change the rate of blinking the LED. With every press of the switch, the LED alternates the blinking interval.
Table 1. Application resources
| Resource | Alias/object | Purpose |
|---|---|---|
| LED (BSP) | CYBSP_USER_LED1 | User LED to show the output |
| Switch (BSP) | CYBSP_USER_BTN | User switch to generate the interrupt |
| Resources | Links |
|---|---|
| Application notes | AN79953 – Getting started with PSoC™ 4 |
| Code examples | Using ModusToolbox™ on GitHub |
| Device documentation | PSoC™ 4 datasheets PSoC™ 4 technical reference manuals |
| Development kits | Select your kits from the Evaluation board finder page. |
| Libraries on GitHub | mtb-pdl-cat2 – PSoC™ 4 Peripheral Driver Library (PDL) mtb-hal-cat2 – Hardware Abstraction Layer (HAL) library |
| 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: CE230654 - PSoC™ 4: GPIO interrupt
| Version | Description of change |
|---|---|
| 1.0.0 | New code example |
| 2.0.0 | Major update to support ModusToolbox™ software v2.2, added support for new kits. This version is not backward compatible with ModusToolbox™ software v2.1. |
| 2.1.0 | Added support for new kits |
| 3.0.0 | Major update to support ModusToolbox™ v3.0. This version is not backward compatible with the previous versions of ModusToolbox™ software. |
| 3.1.0 | Added support for CY8CPROTO-040T and updated to support ModusToolbox™ v3.1. |
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