This example demonstrates how to use the inter-processor communication (IPC) driver to implement a message pipe in PSoC™ 6 MCU. The pipe is used to send messages between CPUs.
See the "PSoC™ 6 MCU dual-CPU development" section in AN215656 – PSoC™ 6 MCU: Dual-CPU system design for instructions on how to develop dual-CPU applications.
In this example, the CM0+ CPU generates 32-bit random numbers periodically using the crypto block. The CM4 CPU receives the random numbers from the CM0+ CPU through IPC pipes. The CM4 CPU prints the random numbers to a terminal emulator. It also controls when the CM0+ CPU starts and stops creating random numbers.
Provide feedback on this code example.
- ModusToolbox™ v3.1 or later (tested with v3.1)
- Board support package (BSP) minimum required version: 4.2.0
- Programming language: C
- Associated parts: All PSoC™ 6 MCU parts, AIROC™ CYW20819 Bluetooth® & Bluetooth® LE SoC, AIROC™ CYW43012 Wi-Fi & Bluetooth® combo chip, AIROC™ CYW4343W Wi-Fi & Bluetooth® combo chip, AIROC™ CYW4373 Wi-Fi & Bluetooth® combo chip, AIROC™ CYW43439 Wi-Fi & Bluetooth® combo chip
- GNU Arm® Embedded Compiler v11.3.1 (
GCC_ARM) – Default value ofTOOLCHAIN - Arm® Compiler v6.16 (
ARM) - IAR C/C++ Compiler v9.30.1 (
IAR)
- PSoC™ 62S2 Wi-Fi Bluetooth® Prototyping Kit (
CY8CPROTO-062S2-43439) – Default value ofTARGET - PSoC™ 6 Wi-Fi Bluetooth® Prototyping Kit (
CY8CPROTO-062-4343W) - PSoC™ 6 Wi-Fi Bluetooth® Pioneer Kit (
CY8CKIT-062-WIFI-BT) - PSoC™ 6 Bluetooth® LE Pioneer Kit (
CY8CKIT-062-BLE) - PSoC™ 6 Bluetooth® LE Prototyping Kit (
CY8CPROTO-063-BLE) - PSoC™ 62S2 Wi-Fi Bluetooth® Pioneer Kit (
CY8CKIT-062S2-43012) - PSoC™ 62S1 Wi-Fi Bluetooth® Pioneer Kit (
CYW9P62S1-43438EVB-01) - PSoC™ 62S1 Wi-Fi Bluetooth® Pioneer Kit (
CYW9P62S1-43012EVB-01) - PSoC™ 62S3 Wi-Fi Bluetooth® Prototyping Kit (
CY8CPROTO-062S3-4343W) - Rapid IoT connect developer Kit (
CYSBSYSKIT-DEV-01) - PSoC™ 62S4 Pioneer Kit (
CY8CKIT-062S4) - PSoC™ 62S2 Evaluation Kit (
CY8CEVAL-062S2,CY8CEVAL-062S2-LAI-4373M2,CY8CEVAL-062S2-MUR-43439M2,CY8CEVAL-062S2-LAI-43439M2,CY8CEVAL-062S2-MUR-4373EM2,CY8CEVAL-062S2-MUR-4373M2)
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 Bluetooth® LE Pioneer Kit (CY8CKIT-062-BLE) and the PSoC™ 6 Wi-Fi Bluetooth® Pioneer Kit (CY8CKIT-062-WIFI-BT) 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".
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.
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-dual-cpu-ipc-pipes" application with the desired name "Psoc6DualCpuIpcPipes" 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-dual-cpu-ipc-pipes --user-app-name Psoc6DualCpuIpcPipes --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 cloneandmake getlibscommands 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).
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).
If using a PSoC™ 64 "Secure" MCU kit (like CY8CKIT-064B0S2-4343W), the PSoC™ 64 device 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.
-
Connect the board to your PC using the provided USB cable through the KitProg3 USB connector.
-
Open a terminal program and select the KitProg3 COM port. Set the serial port parameters to 8N1 and 115200 baud.
-
Program the board using one of the following:
Using Eclipse IDE
-
Select the application project in the Project Explorer.
-
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 programcommand 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. Confirm that "<CE title>" is displayed on the UART terminal.
Figure 1. Terminal output on program startup
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.
Note: (Only while debugging) On the CM4 CPU, some code in
main()may execute before the debugger halts at the beginning ofmain(). 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 ofmain(). See KBA231071 to learn about this and for the workaround.
In other IDEs
Follow the instructions in your preferred IDE.
In this code example, the CM4 CPU is the primary CPU, which is responsible to initialize the system. To avoid any access to uninitialized hardware, CM0+ waits for CM4 to complete the system initialization by waiting for an IPC command. This code example handles four types of IPC commands:
IPC_CMD_INIT: CM0+ waits for this command to initialize.IPC_CMD_START: CM0+ waits for this command to enable a watchdog timer and the Crypto block.IPC_CMD_STOP: CM0+ waits for this command to disable a watchdog timer and the Crypto block.IPC_CMD_STATUS: CM4 waits for this command to print a number to the terminal.
The CM0+ CPU uses a watchdog timer to periodically wake itself up from sleep. Once it wakes up, it generates a 32-bit random number using the crypto block and sends it to the CM4 CPU.
The CM4 CPU checks if the user has pressed the kit button. When a button press is detected, CM4 informs CM0+ to start creating random numbers. When the button is released, CM4 instructs CM0+ to stop creating random numbers. When CM4 receives a message from CM0+, it parses it, and prints the random number to the terminal.
Figure 2. Firmware flowchart
This application has a different folder structure because it contains the firmware for CM4 and CM0+ applications as follows:
|-- proj_cm0p/ # CM0+ application folder
|-- main.c
|-- Makefile
|-- deps/ # All dependencies folder for CM0+
|-- proj_cm4/ # CM4 application folder
|-- main.c
|-- Makefile
|-- deps/ # All dependencies folder for CM4
|-- shared/ # Shared folder for CM0+ and CM4
|-- include/ # Shared header files
|-- source # Shared source files
|-- templates/ # Contains design configuration files shared between the CM0+ and CM4.
# These files are replicated from the default BSP configuration.
# This code example does not require any custom configuration.
# The intent is to show how to share design configuration between the CM0+ and CM4.
# Also contains linker scripts for the ARM/GCC_ARM/IAR toolchains for CM0P and CM4.
When using the default BSP settings provided by the TARGET folder, it allocates only 8192 bytes of RAM and flash for the CM0+ CPU. This example requires more memory for CM0+; therefore, a custom linker script is required, which is located at templates/TARGET_< BSP-NAME >/.
The application calls cybsp_init() in the main.c of both the CPUs. This leads to a redundant registration of default power management callback on one of the CPUs. The following changes prevents this scenario:
- A custom power management callback, cybsp_register_custom_sysclk_pm_callback(), is defined in proj_cm0p/main.c.
- The Makefile of CM0+ CPU adds
CYBSP_CUSTOM_SYSCLK_PM_CALLBACK=1in theDEFINESvariable.
This code example uses a user pipe. The shared folder contains the implementation of a custom initialization of the system pipes, system semaphores, and user pipes. Each CPU has its own initialization function. Note that the Makefile of both CPUs adds CY_IPC_DEFAULT_CFG_DISABLE=1 in the DEFINES variable. This disables the default IPC configuration that comes with the BSP.
Table 1. Application resources
| Resource | Alias/object | Purpose |
|---|---|---|
| GPIO (HAL) | CYBSP_USER_BTN | User button to start/stop creating random numbers |
| UART (HAL) | cy_retarget_io_uart_obj | UART HAL object used by retarget-io for printing to the console |
| MCWDT (PDL) | MCWDT_HW | Watchdog timer to wake up CM0+ CPU periodically |
| CRYPTO (PDL) | CRYPTO | To generate random numbers |
| Resources | Links |
|---|---|
| Application notes | AN228571 – Getting started with PSoC™ 6 MCU on ModusToolbox™ AN215656 – PSoC™ 6 MCU: Dual-CPU system design |
| Code examples | Using ModusToolbox™ on GitHub |
| Device documentation | PSoC™ 6 MCU datasheets PSoC™ 6 technical reference manuals |
| Development kits | Select your kits from the Evaluation board finder. |
| Libraries on GitHub | mtb-pdl-cat1 – PSoC™ 6 Peripheral Driver Library (PDL) mtb-hal-cat1 – Hardware Abstraction Layer (HAL) library retarget-io – Utility library to retarget STDIO messages to a UART port |
| Middleware on GitHub | capsense – CAPSENSE™ library and documents psoc6-middleware – Links to all PSoC™ 6 MCU middleware |
| 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. |
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 title: CE230807 - PSoC™ 6 MCU: Dual-CPU IPC pipes
| Version | Description of change |
|---|---|
| 1.0.0 | New code example |
| 2.0.0 | Added support for user pipe. Major update to support ModusToolbox™ software v2.2. This version is not backward compatible with ModusToolbox™ software v2.1 |
| 2.1.0 | Added support for target CYSBSYSKIT-DEV-01 |
| 2.2.0 | Added support for target CY8CKIT-062S4. User button scheme changed. |
| 2.3.0 | Added support for CY8CEVAL-062S2 and CY8CEVAL-062S2-LAI-4373M2. Renamed CPU specific application folders (app_cm0p and app_cm4) |
| 3.0.0 | Updated to BSP v3.X and added support for new kits |
| 4.0.0 | Updated to support ModusToolbox™ software v3.1 and BSPs v4.X. This version is not backward compatible with ModusToolbox™ software v2.4. |
| 4.1.0 | Added support for CY8CPROTO-062S2-43439, CY8CEVAL-062S2-LAI-43439M2, CY8CEVAL-062S2-MUR-4373M2, CY8CEVAL-062S2-MUR-4373EM2 |
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