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PSoC™ 4 : SPI slave select inversion with smart IO

This example demonstrates how to use the smart IO peripheral in PSoC™ 4 to invert the output of the serial communication block (SCB) SPI slave select signal. This method can be used for any of the SCB unidirectional signals to invert the signal polarity.

View this README on GitHub.

Provide feedback on this code example.

Requirements

Supported toolchains (make variable 'TOOLCHAIN')

  • GNU Arm® Embedded Compiler v11.3.1 (GCC_ARM) – Default value of TOOLCHAIN
  • Arm® Compiler v6.16 (ARM)
  • IAR C/C++ Compiler v9.30.1 (IAR)

Supported kits (make variable 'TARGET')

Hardware setup

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

  1. For CY8CKIT-041S-MAX, CY8CKIT-149, and CY8CKIT-145-40XX connect SS0_Pin [P2.4] and SS1_Pin [P2.5] to an oscilloscope.

Note: These pins are connected to the user LEDs (LED8 and LED1) on CY8CKIT-145-40XX.

  1. For CY8CKIT-045S, connect SS0_Pin [P3.4] and SS1_Pin [P3.5] to an oscilloscope.

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 If you do not upgrade, you will see an error like "unable to find CMSIS-DAP device" or "KitProg firmware is out of date".

Software setup

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 smart IO peripheral is a port-wide resource; you must define its port before it can be used.

Note: For kits CY8CKIT-041S-MAX, CY8CKIT-149, and CY8CKIT-145-40XX, the smart IO port is Port 2. For CY8CKIT-045S, the smart IO port is Port 3.

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 "mtb-example-psoc4-spi-slave-select-inversion-with-smartio" application with the desired name "SPISlaveInversionSmartIO" configured for the CY8CKIT-149 BSP into the specified working directory, C:/mtb_projects:

project-creator-cli --board-id CY8CKIT-149 --app-id mtb-example-psoc4-spi-slave-select-inversion-with-smartio --user-app-name SPISlaveInversionSmartIO --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. 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).

    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
    
  3. After programming the project into the kit, and observe on the oscilloscope that the signal on SS0_Pin [P2.4] exhibits an active high behavior. Also observe that SS1_Pin [P2.5] exhibits an active low behavior and produces a signal that is of opposite polarity to SS0_Pin.

  4. For CY8CKIT-045S, SS0_Pin is P3.4 and SS1_Pin is P3.5.

Debugging

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.

Design and implementation

The SCB peripheral is configured as a SPI master with two slave select pin connections exposed as symbol terminals. The MOSI, MISO and SCLK pins are not used in this design. The slave select terminals are connected to chip4 and chip5 terminals of the smart IO peripheral. The slave select configurations are active low. The smart IO peripheral is configured to take the chip4 signal, invert it through LUT4 and then output to gpio4. It then takes the chip5 slave select signal and replicates it to gpio5 by using LUT6. The gpio4 and gpio5 terminals are connected to the SS0_Pin and SS1_Pin respectively.

The firmware for the peripheral is implemented in main.c and perform the following functions:

  1. Starts the smart IO peripheral
  2. Starts the SCB peripheral
  3. Selects the slave on ss1 sends sample data
  4. Selects the slave on ss2 sends sample data

This code example is designed for the specified ports on the stated devices. The design is portable to other PSoC™ 4 devices with smart IO, but it may require LUT reconfiguration due to the close relationship between the device port and the peripheral.

Note: SCB connections use a dedicated channel and cannot be routed to other GPIO pins using the smart IO peripheral. If an SCB connection is located on chip then it must connect to gpio4.

Resources and settings

Parameter settings

The smart IO peripheral is configured to route chip4 to gpio4 through LUT4, as shown in Figure 1. It is also configured to route chip5 to gpio5 through LUT5.

Figure 1. Smart IO routing configuration

Figure 2 shows the LUT configurations.The LUTs are configured in “combinatorial” mode. LUT4 is configured to invert the input signal, whereas LUT5 is configured to repeat the input signal. These settings are located in the individual LUT tabs in the configuration dialog.

Figure 2. Smart IO LUT configuration

Table 1. Application resources

Resource Alias/object Purpose
SCB (SPI) mSPI_HW SPI master driver to communicate with the SPI slave
Smart I/O SmartIO Perform simple logic operations on peripheral and GPIO signals at the GPIO port
GPIO SS0_Pin To generate signals on oscilloscope
GPIO SS1_Pin To generate signals on oscilloscope

Related resources

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.

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: CE236712 - PSoC™ 4 : SPI slave select inversion with smart IO

Version Description of change
1.0.0 New code example
1.1.0 Added support for CY8CKIT-045S and updated to support ModusToolbox™ v3.1.


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