This code example generates a square wave using the PWM driver. An LED connected to the PWM output pin blinks at 2 Hz.
Provide feedback on this Code Example.
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Note: This code example version requires ModusToolbox software version 2.2 or later and is not backward compatible with v2.1 or older versions. If you cannot move to ModusToolbox v2.2, use the latest compatible version of this example: latest-v1.X.
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Board Support Package (BSP) minimum required version: 2.0.0
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Programming Language: C
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Associated Parts: All PSoC® 6 MCU parts
- GNU Arm® Embedded Compiler v9.3.1 (
GCC_ARM) - Default value ofTOOLCHAIN - Arm compiler v6.11 (
ARM) - IAR C/C++ compiler v8.42.2 (
IAR)
- PSoC 6 Wi-Fi BT Prototyping Kit (
CY8CPROTO-062-4343W) - Default value ofTARGET - PSoC 6 WiFi-BT Pioneer Kit (
CY8CKIT-062-WIFI-BT) - PSoC 6 BLE Pioneer Kit (
CY8CKIT-062-BLE) - PSoC 6 BLE Prototyping Kit (
CY8CPROTO-063-BLE) - PSoC 62S2 Wi-Fi BT Pioneer Kit (
CY8CKIT-062S2-43012) - PSoC 62S1 Wi-Fi BT Pioneer Kit (
CYW9P62S1-43438EVB-01) - PSoC 62S1 Wi-Fi BT Pioneer Kit (
CYW9P62S1-43012EVB-01) - PSoC 62S3 Wi-Fi BT Prototyping Kit (
CY8CPROTO-062S3-4343W) - PSoC 64 Secure Boot Wi-Fi BT Pioneer Kit (
CY8CKIT-064B0S2-4343W) - Rapid IoT Connect Platform RP01 Feather Kit (
CYSBSYSKIT-01) - Rapid IoT Connect Developer Kit (
CYSBSYSKIT-DEV-01)
This example uses the board's default configuration. See the kit user guide to ensure that the board is configured correctly.
Note: The PSoC 6 BLE Pioneer Kit (CY8CKIT-062-BLE) and the PSoC 6 WiFi-BT Pioneer Kit (CY8CKIT-062-WIFI-BT) ship with KitProg2 installed. The ModusToolbox software 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 If you do not upgrade, you will see an error like "unable to find CMSIS-DAP device" or "KitProg firmware is out of date".
Install a terminal emulator if you don't have one. Instructions in this document use Tera Term.
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Click the New Application link in the Quick Panel (or, use File > New > ModusToolbox Application). This launches the Project Creator tool.
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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.
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In the Project Creator - Select Application dialog, choose the example by enabling the checkbox.
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Optionally, change the suggested New Application Name.
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Enter the local path in the Application(s) Root Path field to indicate where the application needs to be created.
Applications that can share libraries can be placed in the same root path.
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Click Create to complete the application creation process.
For more details, see the Eclipse IDE for ModusToolbox User Guide (locally available at {ModusToolbox install directory}/ide_{version}/docs/mt_ide_user_guide.pdf).
ModusToolbox provides the Project Creator as both a GUI tool and a command line tool to easily create one or more ModusToolbox applications. See the "Project Creator Tools" section of the ModusToolbox User Guide for more details.
Alternatively, you can manually create the application using the following steps:
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Download and unzip this repository onto your local machine, or clone the repository.
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Open a CLI terminal and navigate to the application folder.
On Linux and macOS, you can use any terminal application. On Windows, open the modus-shell app from the Start menu.
Note: The cloned application contains a default BSP file (TARGET_xxx.mtb) in the deps folder. Use the Library Manager (
make modlibscommand) to select and download a different BSP file, if required. If the selected kit does not have the required resources or is not supported, the application may not work. -
Import the required libraries by executing the
make getlibscommand.
Various CLI tools include a -h option that prints help information to the terminal screen about that tool. For more details, see the ModusToolbox User Guide (locally available at {ModusToolbox install directory}/docs_{version}/mtb_user_guide.pdf).
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Follow the instructions from the CLI section to create the application, and import the libraries using the
make getlibscommand. -
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 User Guide (locally available at {ModusToolbox install directory}/docs_{version}/mtb_user_guide.pdf.
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Follow the instructions displayed in the terminal to create or import the application as an IDE project.
If using a PSoC 64 Secure MCU kit (like CY8CKIT-064B0S2-4343W), the PSoC 64 Secure MCU must be provisioned with keys and policies before being programmed. Follow the instructions in the Secure Boot SDK User Guide to provision the device. If the kit is already provisioned, copy-paste the keys and policy folder to the application folder.
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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.
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Using Eclipse IDE for ModusToolbox:
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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).
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Using CLI:
From the terminal, execute the
make programcommand to build and program the application using the default toolchain to the default target. You can specify a target and toolchain manually:make program TARGET=<BSP> TOOLCHAIN=<toolchain>Example:
make program TARGET=CY8CPROTO-062-4343W TOOLCHAIN=GCC_ARM
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After programming, the application starts automatically. Confirm that the user LED on the kit blinks at half-second intervals (2 Hz).
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The UART terminal shows the PWM initialization status.
You can debug the example to step through the code. In the IDE, use the <Application Name> Debug (KitProg3_MiniProg4) configuration in the Quick Panel. For more details, see the "Program and Debug" section in the Eclipse IDE for ModusToolbox User Guide.
Note: (Only while debugging) On the CM4 CPU, some code in main() may execute before the debugger halts at the beginning of main(). This means that some code executes twice - once before the debugger stops execution, and again after the debugger resets the program counter to the beginning of main(). See KBA231071 to learn about this and for the workaround.
Table 1. Application Resources
| Resource | Alias/Object | Purpose |
|---|---|---|
| PWM (HAL) | pwm_led_control | Generate square wave and bring out the signal to GPIO |
| GPIO (HAL) | CYBSP_USER_LED | User LED to show the PWM output |
| UART (HAL) | cy_retarget_io_uart_obj | UART HAL object used by Retarget-IO for Debug UART port |
The PWM is configured to produce a 2-Hz PWM output. In this example, the PWM output duty cycle is set to 50%, which generates a square wave. The output of the PWM is connected to an LED that blinks at 500 ms (inverse of PWM output frequency, 2 Hz). After the PWM is started, the CPU is put to sleep mode to save power.
To vary the frequency and duty cycle of the PWM output, change the PWM_FREQUENCY and PWM_DUTY_CYCLE macros in the main.c file and program the application. Observe the change in LED blink pattern.
The application uses the UART to print messages on the UART terminal. The UART resource initialization and retargeting of standard I/O to the UART port is done using the retarget-io library.
| Application Notes | |
|---|---|
| AN228571 – Getting Started with PSoC 6 MCU on ModusToolbox | Describes PSoC 6 MCU devices and how to build your first application with ModusToolbox |
| AN221774 – Getting Started with PSoC 6 MCU on PSoC Creator | Describes PSoC 6 MCU devices and how to build your first application with PSoC Creator |
| AN210781 – Getting Started with PSoC 6 MCU with Bluetooth Low Energy (BLE) Connectivity on PSoC Creator | Describes PSoC 6 MCU with BLE Connectivity devices and how to build your first application with PSoC Creator |
| AN215656 – PSoC 6 MCU: Dual-CPU System Design | Describes the dual-CPU architecture in PSoC 6 MCU, and shows how to build a simple dual-CPU design |
| Code Examples | |
| Using ModusToolbox | Using PSoC Creator |
| Device Documentation | |
| PSoC 6 MCU Datasheets | PSoC 6 Technical Reference Manuals |
| Development Kits | Buy at www.cypress.com |
| CY8CKIT-062-BLE PSoC 6 BLE Pioneer Kit | CY8CKIT-062-WiFi-BT PSoC 6 WiFi-BT Pioneer Kit |
| CY8CPROTO-063-BLE PSoC 6 BLE Prototyping Kit | CY8CPROTO-062-4343W PSoC 6 Wi-Fi BT Prototyping Kit |
| CY8CKIT-062S2-43012 PSoC 62S2 Wi-Fi BT Pioneer Kit | CY8CPROTO-062S3-4343W PSoC 62S3 Wi-Fi BT Prototyping Kit |
| CYW9P62S1-43438EVB-01 PSoC 62S1 Wi-Fi BT Pioneer Kit | CYW9P62S1-43012EVB-01 PSoC 62S1 Wi-Fi BT Pioneer Kit |
| CY8CKIT-064B0S2-4343W PSoC 64 Secure Boot Wi-Fi BT Pioneer Kit | CYSBSYSKIT-01 Rapid IoT Connect Platform RP01 Feather Kit |
| CYSBSYSKIT-DEV-01 Rapid IoT Connect Developer Kit | |
| Libraries | |
| PSoC 6 Peripheral Driver Library (PDL) and docs | mtb-pdl-cat1 on GitHub |
| Cypress Hardware Abstraction Layer (HAL) Library and docs | mtb-hal-cat1 on GitHub |
| Retarget IO - A utility library to retarget the standard input/output (STDIO) messages to a UART port | retarget-io on GitHub |
| Middleware | |
| CapSense® library and docs | capsense on GitHub |
| Links to all PSoC 6 MCU Middleware | psoc6-middleware on GitHub |
| Tools | |
| Eclipse IDE for ModusToolbox | The cross-platform, Eclipse-based IDE for IoT designers that supports application configuration and development targeting converged MCU and wireless systems. |
| PSoC Creator™ | The Cypress IDE for PSoC and FM0+ MCU development. |
Cypress provides a wealth of data at www.cypress.com to help you select the right device, and quickly and effectively integrate it into your design.
For PSoC 6 MCU devices, see How to Design with PSoC 6 MCU - KBA223067 in the Cypress community.
Document Title: CE220291 - PSoC 6 MCU: PWM Square Wave
| Version | Description of Change |
|---|---|
| 1.0.0 | New code example |
| 1.1.0 | Updated to support ModusToolbox software v2.1 and new kits |
| 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 |
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