README.md

# Class-B safety test: SPI loopback

This code example demonstrates the use of the Class-B safety test library to test the SPI loopback Test in the PSoC&trade; 6 MCU and XMC7000 MCUs. The example performs the SPI loopback test by configuring one SCB instance as SPI master and connecting its MOSI and MISO pins internally using Smart I/O.


[View this README on GitHub.](https://github.com/Infineon/mtb-example-ce239832-safety-spi-loopback-test)

[Provide feedback on this code example.](https://cypress.co1.qualtrics.com/jfe/form/SV_1NTns53sK2yiljn?Q_EED=eyJVbmlxdWUgRG9jIElkIjoiQ0UyMzk4MzIiLCJTcGVjIE51bWJlciI6IjAwMi0zOTgzMiIsIkRvYyBUaXRsZSI6IkNsYXNzLUIgc2FmZXR5IHRlc3Q6IFNQSSBsb29wYmFjayIsInJpZCI6InN1YnVkaGkiLCJEb2MgdmVyc2lvbiI6IjEuMC4wIiwiRG9jIExhbmd1YWdlIjoiRW5nbGlzaCIsIkRvYyBEaXZpc2lvbiI6Ik1DRCIsIkRvYyBCVSI6IklDVyIsIkRvYyBGYW1pbHkiOiJQU09DIn0=)


## Requirements

- [ModusToolbox&trade;](https://www.infineon.com/modustoolbox) v3.2 or later (tested with v3.2)
- Board support package (BSP) minimum required version: v4.2.0
- Programming language: C
- Associated parts: All [PSoC&trade; 6 MCU](https://www.infineon.com/cms/en/product/microcontroller/32-bit-psoc-arm-cortex-microcontroller/psoc-6-32-bit-arm-cortex-m4-mcu) and [XMC7000 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&reg; Embedded Compiler v11.3.1 (`GCC_ARM`) – Default value of `TOOLCHAIN`

## Supported kits (make variable 'TARGET')

- [PSoC&trade; 62S2 Wi-Fi Bluetooth&reg; Prototyping Kit](https://www.infineon.com/CY8CPROTO-062S2-43439) (`CY8CPROTO-062S2-43439`) – Default value of `TARGET`
- [PSoC&trade; 6 Wi-Fi Bluetooth&reg; Prototyping Kit](https://www.infineon.com/CY8CPROTO-062-4343W) (`CY8CPROTO-062-4343W`)
- [PSoC&trade; 6 Wi-Fi Bluetooth&reg; Pioneer Kit](https://www.infineon.com/CY8CKIT-062-WIFI-BT) (`CY8CKIT-062-WIFI-BT`)
- [PSoC&trade; 6 Bluetooth&reg; LE Pioneer Kit](https://www.infineon.com/CY8CKIT-062-BLE) (`CY8CKIT-062-BLE`)
- [PSoC&trade; 6 Bluetooth&reg; LE Prototyping Kit](https://www.infineon.com/CY8CPROTO-063-BLE) (`CY8CPROTO-063-BLE`)
- [PSoC&trade; 62S2 Wi-Fi Bluetooth&reg; Pioneer Kit](https://www.infineon.com/CY8CKIT-062S2-43012) (`CY8CKIT-062S2-43012`)
- [PSoC&trade; 62S1 Wi-Fi Bluetooth&reg; Pioneer Kit](https://www.infineon.com/CYW9P62S1-43438EVB-01) (`CYW9P62S1-43438EVB-01`)
- [PSoC&trade; 62S1 Wi-Fi Bluetooth&reg; Pioneer Kit](https://www.infineon.com/CYW9P62S1-43012EVB-01) (`CYW9P62S1-43012EVB-01`)
- [PSoC&trade; 64 "Secure Boot" Wi-Fi Bluetooth&reg; Pioneer Kit](https://www.infineon.com/CY8CKIT-064B0S2-4343W) (`CY8CKIT-064B0S2-4343W`)
- [PSoC&trade; 62S4 Pioneer Kit](https://www.infineon.com/CY8CKIT-062S4) (`CY8CKIT-062S4`)
- [PSoC&trade; 62S2 Evaluation Kit](https://www.infineon.com/CY8CEVAL-062S2) (`CY8CEVAL-062S2`, `CY8CEVAL-062S2-LAI-4373M2`, `CY8CEVAL-062S2-MUR-43439M2`, `CY8CEVAL-062S2-LAI-43439M2`, `CY8CEVAL-062S2-MUR-4373EM2`, `CY8CEVAL-062S2-MUR-4373M2`,`CY8CEVAL-062S2-CYW43022CUB`)
- [XMC7200 Evaluation Kit](https://www.infineon.com/KIT_XMC72_EVK) (`KIT_XMC72_EVK`, `KIT_XMC72_EVK_MUR_43439M2`)
- [PSoC&trade; 62S3 Wi-Fi Bluetooth&reg; Prototyping Kit](https://www.infineon.com/CY8CPROTO-062S3-4343W) (`CY8CPROTO-062S3-4343W`)
- [XMC7100 Evaluation Kit](https://www.infineon.com/KIT_XMC71_EVK_LITE_V1) (`KIT_XMC71_EVK_LITE_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

See the [ModusToolbox&trade; tools package installation guide](https://www.infineon.com/ModusToolboxInstallguide) 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](https://teratermproject.github.io/index-en.html).

This example requires no additional software or tools.


## Using the code example

### Create the project

The ModusToolbox&trade; tools package provides the Project Creator as both a GUI tool and a command line tool.

<details><summary><b>Use Project Creator GUI</b></summary>

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](https://www.infineon.com/ModusToolboxProjectCreator) (locally available at *{ModusToolbox&trade; 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](#supported-kits-make-variable-target).

   > **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.

</details>

<details><summary><b>Use Project Creator CLI</b></summary>

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&trade; 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; installation instead of a standard Windows command-line application. This shell provides access to all ModusToolbox&trade; 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&trade; 6 Class-B safety test: SPI loopback](https://github.com/Infineon/mtb-example-ce239832-safety-spi-loopback-test)" application with the desired name "SPI_Loopback" configured for the *CY8CPROTO-062-4343W* BSP into the specified working directory, *C:/mtb_projects*:

   ```
   project-creator-cli --board-id CY8CPROTO-062-4343W --app-id mtb-example-ce239832-safety-spi-loopback-test --user-app-name SPI_Loopback --target-dir "C:/mtb_projects"
   ```


The 'project-creator-cli' 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>

> **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; tools package user guide](https://www.infineon.com/ModusToolboxUserGuide) (locally available at {ModusToolbox&trade; install directory}/docs_{version}/mtb_user_guide.pdf).

</details>


### Open the project

After the project has been created, you can open it in your preferred development environment.


<details><summary><b>Eclipse IDE</b></summary>

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&trade; user guide](https://www.infineon.com/MTBEclipseIDEUserGuide) (locally available at *{ModusToolbox&trade; install directory}/docs_{version}/mt_ide_user_guide.pdf*).

</details>


<details><summary><b>Visual Studio (VS) Code</b></summary>

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&trade; user guide](https://www.infineon.com/MTBVSCodeUserGuide) (locally available at *{ModusToolbox&trade; install directory}/docs_{version}/mt_vscode_user_guide.pdf*).

</details>


<details><summary><b>Command line</b></summary>

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&trade; tools package user guide](https://www.infineon.com/ModusToolboxUserGuide) (locally available at *{ModusToolbox&trade; install directory}/docs_{version}/mtb_user_guide.pdf*).

</details>


## Operation

1. Connect the board to your PC using the provided USB cable through the KitProg3 USB connector.

   > **Note:** For CY8CKIT-062S4 and CY8CPROTO-063-BLE use external jumper to connect 2.0 to 2.1 and 6.4 to 6.5 .

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

3. Program the board using one of the following:

   <details><summary><b>Using Eclipse IDE</b></summary>

      1. Select the application project in the Project Explorer.

      2. In the **Quick Panel**, scroll down, and click **\<Application Name> Program (KitProg3_MiniProg4)**.
   </details>


   <details><summary><b>In other IDEs</b></summary>

   Follow the instructions in your preferred IDE.
   </details>


   <details><summary><b>Using CLI</b></summary>

     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
      ```
   </details>

4. After programming, the application starts automatically. Confirm that **Class-B Safety Test: SPI Loopback** is displayed on the UART terminal.

   **Figure 1. Terminal output on program startup**

   ![](images/image.png)
5. Confirm that the serial terminal displays the result of the SPI loopback test.


## Debugging


You can debug the example to step through the code.


<details><summary><b>In Eclipse IDE</b></summary>
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&trade; user guide](https://www.infineon.com/MTBEclipseIDEUserGuide).


</details>


<details><summary><b>In other IDEs</b></summary>

Follow the instructions in your preferred IDE.

</details>


## Design and implementation

This example configures one SCB instance as an SPI master, utilizing smart I/O to internally connect the MOSI and MISO pins. The test validates bidirectional communication within the SPI interface by transmitting data from the master via MOSI and receiving it back through MISO.

The example begins by initializing the BSP configuration and setting up the retarget-io for debug prints. It then configures the smart I/O and SPI blocks. To verify the SPI loopback communication, the example performs a communication test using the SelfTest_SPI_SCB() API from the mtb-stl middleware.

During the SPI loopback test, data transmission and reception are conducted by calling a function that transfers bytes ranging from 0x01 to 0xFF. By comparing the transmitted and received data, the test ensures accurate bidirectional data transfer within the SPI interface.

### Resources and settings


**Table 1. Application resources**

 Resource  |  Alias/object     |    Purpose
 :-------- | :-------------    | :------------
 SCB->SPI (PDL) | CYBSP_DUT_SPI | SPI to communicate as a master or loopback test
 Smart I/O (PDL) | CYBSP_SMARTIO_SPI_LOOPBACK | To internally connect the MISO to MOSI for SPI loopback test

<br>


## Related resources


Resources  | Links
-----------|----------------------------------
Application notes  | [AN228571](https://www.infineon.com/AN228571) – Getting started with PSoC&trade; 6 MCU on ModusToolbox&trade; <br>[AN234334](https://www.infineon.com/dgdl/Infineon-AN234334_Getting_started_with_XMC7000_MCU_on_ModusToolbox_software-ApplicationNotes-v01_00-EN.pdf?fileId=8ac78c8c8412f8d301842d32c5765bfd) – Getting started with XMC7000 MCU on ModusToolbox&trade;
Code examples  | [Using ModusToolbox&trade;](https://github.com/Infineon/Code-Examples-for-ModusToolbox-Software) on GitHub
Device documentation | [PSoC&trade; 6 MCU datasheets](https://documentation.infineon.com/html/psoc6/bnm1651211483724.html) <br> [PSoC&trade; 6 technical reference manuals](https://documentation.infineon.com/html/psoc6/zrs1651212645947.html)<br>[XMC7000 MCU datasheets](https://www.infineon.com/cms/en/product/microcontroller/32-bit-industrial-microcontroller-based-on-arm-cortex-m/) <br> [XMC7000 technical reference manuals](https://www.infineon.com/cms/en/product/microcontroller/32-bit-industrial-microcontroller-based-on-arm-cortex-m/)
Development kits | Select your kits from the [Evaluation board finder](https://www.infineon.com/cms/en/design-support/finder-selection-tools/product-finder/evaluation-board).
Libraries on GitHub  | [mtb-pdl-cat1](https://github.com/Infineon/mtb-pdl-cat1) – PSoC&trade; 6 Peripheral Driver Library (PDL)  <br> [mtb-hal-cat1](https://github.com/Infineon/mtb-hal-cat1) – Hardware Abstraction Layer (HAL) library
Middleware on GitHub | [mtb-stl](https://github.com/Infineon/mtb-stl) - Safety Test Library (STL)
Tools  | [ModusToolbox&trade;](https://www.infineon.com/modustoolbox) – ModusToolbox&trade; 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&trade; Industrial/IoT MCUs, AIROC&trade; Wi-Fi and Bluetooth&reg; connectivity devices, XMC&trade; Industrial MCUs, and EZ-USB&trade;/EZ-PD&trade; wired connectivity controllers. ModusToolbox&trade; incorporates a comprehensive set of BSPs, HAL, libraries, configuration tools, and provides support for industry-standard IDEs to fast-track your embedded application development.

<br>


## Other resources

Infineon provides a wealth of data at [www.infineon.com](https://www.infineon.com) to help you select the right device, and quickly and effectively integrate it into your design.


## Document history

Document title: *CE239832* – *Class-B safety test: SPI loopback*

 Version | Description of change
 ------- | ---------------------
 1.0.0   | New code example

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