PSoC™ Control MCU: SCB SPI master with DMA

This example demonstrates the use of the SPI Serial Communication Block (SCB) resource for PSoC™ Control MCU: in master mode using DMA. The SPI master is configured to send command packets to control a user LED on the slave. Both the master and slave can be on the same device or on different devices.

View this README on GitHub.

Provide feedback on this code example.

Requirements

ModusToolbox™ v3.3 or later (tested with v3.3)
Board support package (BSP) minimum required version for:
- KIT_PSC3M5_EVK: 1.0.3
- KIT_PSC3M5_CC1: 1.0.3
- KIT_PSC3M5_CC2: 1.0.3
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 C3 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.

Use jumper wires to establish a connection between the master and slave on the kit. For the default kit, do the following on the board (verify with the corresponding custom design.modus file to find the respective SPI pins for other kits).

Board name	Master SCLK	Master MOSI	Master MISO	Master SSO	Slave SCLK	Slave MOSI	Slave MISO	Slave SSO
KIT_PSC3M5_EVK	7.0	7.1	7.2	7.3	3.2	3.0	4.1	3.3

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

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-psoc6-spi-master-dma" application with the desired name "SpiMasterDma" configured for the CY8CPROTO-062S2-43439 BSP into the specified working directory, C:/mtb_projects:

project-creator-cli --board-id CY8CPROTO-062S2-43439 --app-id mtb-example-psoc6-spi-master-dma --user-app-name SpiMasterDma --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

You can configure this example to work in master-only or slave-only or both master and slave SPI modes by configuring the value of the SPI_MODE macro in the interface.h file. By default, this example is configured to work in the master SPI mode. Kits with two SPI ports can be configured to work in both SPI modes: one acting as the master and the other as the slave.

The CYW9P62S1-43012EVB-01, CY8CPROTO-062S3-4343W, and CY8CKIT-062S4 kits support only one SPI port on the I/O header. Therefore, you can configure these kits only in either master mode (set SPI_MODE to SPI_MODE_MASTER) or slave mode (set SPI_MODE to SPI_MODE_SLAVE). In that case, you need two kits, one acting as the SPI master and the other one acting as the SPI slave, to run this example.

Connect the board to your PC using the provided USB cable through the KitProg3 USB connector.
Configure the value of the SPI_MODE macro in interface.h to SPI_MODE_BOTH (only for kits with two SPI ports).
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
```
After programming, the application starts automatically. Observe that the kit LED blinks at 1 Hz.

Configuring a kit with one SPI port in slave mode

The CYW9P62S1-43012EVB-01, CY8CPROTO-062S3-4343W, and CY8CKIT-062S4 kits support only one SPI port in the I/O header. By default, the kit is configured to work in master-only mode (ensure that the SPI_MODE macro in the interface.h is configured as SPI_MODE_MASTER).

Do the following to configure the kit to work in slave-only mode:

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.

Add the below Note for relevant CEs only, like PSoC 6 MCU based. Remove this note for others.

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.

In other IDEs

Follow the instructions in your preferred IDE.

Design and implementation

Resources and settings

The Arm® Cortex®-M33 (CM33) CPU controls both the master and slave SCBs. You can configure this example to operate in both master and slave SPI modes so that you can run this example using a single kit provided that the kit supports two SPI ports on its I/O header.

The master sends a packet to the slave with a command to turn ON or turn OFF the user LED. The packets are sent at an interval of 1 second. DMA is used to transfer the command data from the SRAM to the SPI FIFO at the master side, and similarly from the SPI FIFO to the SRAM at the slave side. The slave receives the packet and controls the LED according to the command.

Table 2. Application resources

Resource	Alias/object	Purpose
SCB (SPI)	mSPI	Master SPI SCB
SCB (SPI)	sSPI	Slave SPI SCB
GPIO	CYBSP_USER_LED	LED indication
DMA	txDma	Data transfer
DMA	rxDma	Data transfer

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 datasheet PSOC™ Control C3 technical reference manuals
Development kits	Select your kits from the Evaluation board finder.
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.

For PSoC™ 6 MCU devices, see How to design with PSoC™ 6 MCU - KBA223067 in the Infineon Developer community.

Document history

Document title: CE240722 - SCB SPI master with DMA

Version	Description of change
1.0.0	New code example

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