Class-B Safety Test for PSOC™ Control MCU: TCPWM peripherals

This code example demonstrates the usage of the Class-B Safety Test Library to test the TCPWM resource configured as a timer/counter, PWM, and PWM output gate kill in PSOC™ Control C3 MCUs. The example verifies the proper operation and accuracy of these peripherals adhering to the IEC 60730 standards.

View this README on GitHub.

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Requirements

• ModusToolbox™ v3.4 or later (tested with v3.4)
• Board support package (BSP) minimum required version for: v1.3.0
• Programming language: C
• Associated parts: All PSOC™ Control C3 MCUs

Supported toolchains (make variable 'TOOLCHAIN')

• GNU Arm® Embedded Compiler v11.3.1 (GCC_ARM) – Default value of TOOLCHAIN
• Arm® Compiler v6.22 (ARM)
• IAR C/C++ Compiler v9.50.2 (IAR)

Supported kits (make variable 'TARGET')

• PSOC™ Control C3M5 Evaluation Kit (KIT_PSC3M5_EVK) – Default value of TARGET

Hardware setup

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

Table 2. Jumper connections for PWM gate kill

Note: Connect the LPCOMP +ve pin to VCC for PWM gate kill test

BSP	LPCOMP +ve pin
KIT_PSC3M5_EVK	P8.0

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 "PSOC™ Control Class-B safety test: TCPWM peripherals" application with the desired name "safety tcpwm test" configured for the KIT_PSC3M5_EVK BSP into the specified working directory, C:/mtb_projects:

project-creator-cli --board-id KIT_PSC3M5_EVK --app-id mtb-example-ce241078-safety-tcpwm-test --user-app-name safety tcpwm test --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 the provided USB cable through the KitProg3 USB connector.

2. Open a terminal program and select the KitProg3/JLink COM port. Set the serial port parameters to 8N1 and 115200 baud.

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 (KitProg3_MiniProg4) or <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 Class-B Safety Test: TCPWM peripheral is displayed on the UART terminal.

   Figure 1. Terminal output on program startup

   

5. To run the self-test commands, enter the following:

   • 1: For timer/counter peripheral
   • 2: For PWM
   • 3: For PWM gate kill

6. Based on the commands entered in the previous step, the serial terminal displays the result of the tests performed on the respective peripheral.

   Note: Ensure to make the connections for the PWM test as described in the Hardware setup section.

Debugging

You can debug the example to step through the code.

In Eclipse IDE

Use the <Application Name> Debug (KitProg3_MiniProg4) or <Application Name> Debug (JLink) 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.

Design and implementation

This code example demonstrates the usage of the Class-B Safety Test library to test the TCPWM resource configured as a timer/counter, PWM, and PWM output gate kill in the PSOC™ Control C3 MCUs. It utilizes the Class-B Safety Test library to execute these tests.

The example starts by initializing the BSP configuration according to the design configurations and setting up the retarget-io for debug prints. The CPU then waits for the commands entered from the serial terminal. When it is received, the code parses the commands that have been sent:

• Command 1 - Timer/counter test:

  • This test focuses on the timer/counter block. It configures the block to the timer/counter personality.
  • Verifies if the counter is incrementing and the count value falls within the expected threshold.

• Command 2 - PWM test:

  • The test configures a 32-bit PWM to run at 1/3 duty on, 2/3 off duty cycle with a 1 millisecond period and starts the PWM.
  • The CPU is then run in a loop for 5 milliseconds and the output is polled continuously in the loop. The 0 (low) and 1 (high) instances are counted.
  • The on/off ratio is then calculated and checked if it falls within the expected threshold.

• Command 3 - PWM gate kill test:

  • The kill mode of the TCPWM block is configured as stop on kill.
  • For PSOC™ Control C3 MCUs, the low-power comparator output is routed to the kill signal of TCPWM, indicating overvoltage/overcurrent condition if the voltage on the positive terminal is greater than the voltage on the negative terminal.
  • If an overvoltage/overcurrent condition occurs, it kills the PWM output. The TCPWM base and counter number are passed to check whether the counter has stopped or not.
  • If the counter is not incrementing or decrementing, the PWM output is inactive as the PWM is killed.

This example utilizes the TCPWM block of PSOC™ Control C3 MCUs to conduct comprehensive testing. The custom design.modus file with minimal configuration changes is shipped with the code example for the respective kits.

By executing these tests, the example ensures the proper functioning of the TCPWM peripheral, providing valuable insights into the performance and reliability of PSOC™ Control C3 MCUs. The test results are displayed on the console, facilitating easy evaluation and troubleshooting.

Resources and settings

Table 1. Application resources

Resource	Alias/object	Purpose
UART (PDL)	cy_retarget_io_uart_obj	UART object used by Retarget-IO for the Debug UART port
GPIO (PDL)	CYBSP_USER_LED	User LED
TCPWM[0] Group[0] Counter[0]	CYBSP_TIMER_COUNTER_TEST	Timer for timer/counter test
TCPWM[0] Group[0] Counter[1]	CYBSP_CLOCK_TEST_TIMER	clock test timer
TCPWM[0] Group[0] Counter[2]	CYBSP_PWM	PWM for PWM test
TCPWM[0] Group[0] Counter[3]	CYBSP_PWM_GATEKILL	PWM for PWM gate kill test
Low-power comparator[0]	LPCOMP	Comparator to generate the gate kill pulse
P8.0	LPCOMP_IN	Positive input of comparator

Related resources

Resources	Links
Application notes	AN238329 – Getting started with PSOC™ Control C3 MCU on ModusToolbox™ software
Code examples	Using ModusToolbox™ on GitHub
Device documentation	PSOC™ Control C3 MCU datasheets PSOC™ Control C3 technical reference manuals
Development kits	Select your kits from the Evaluation Board Finder page.
Libraries on GitHub	mtb-pdl-cat1 – Peripheral Driver Library (PDL) mtb-hal-psc3 – Hardware Abstraction Layer (HAL) library 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.

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.

Document history

Document title: CE241078 – Class-B Safety Test for PSOC™ Control MCU: TCPWM peripherals

Version	Description of change
1.0.0	New code example

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