LIN master and slave communication with internal PHY

This code example demonstrates how to communicate with LIN master and LIN slave each other by using internal LIN PHY and two individual boards. It also supports the loop-back mode which is for communication between internal master channel and slave channel for test purpose.

View this README on GitHub.

Provide feedback on this code example.

Requirements

ModusToolbox™ v3.4 or later (tested with v3.4)
Board support package (BSP) minimum required version: 3.1.0
Programming language: C
Associated parts: PSOC™ 4 HV MCU

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™ 4 HVMS-64K Evaluation Kit (KIT_PSOC4-HVMS-64K_LITE) – Default value of TARGET
PSOC™ 4 HVMS-128K Evaluation Kit (KIT_PSOC4-HVMS-128K_LITE)

Hardware setup

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

For the external commnication by using internal LIN PHY, this example requires two different boards; one for LIN master channel and another for LIN slave channel.

The setup can be skipped if it's loop-back mode.

Table 1 shows how additional components should be implemented on the master board and the slave board and Figure 1 shows where the components to be implemented on the circuit schematic.

Table 1. LIN master and slave board additional component implementation

Components	Master board	Slave board
Jumper	Implement on J19	Implement on J19
D-SUB 9	Implement on J20	Implement on J20
D-SUB 9 cable	Connect to slave board	Connect to master board
PMEG4010ET,215	Implement on D9	-
1k ohm resistor	Implement on R78	-
12V adapter	Connect to DC jack Turn SW4 to ADPTR side	-

Figure 1. Circuit schematic

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.

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-ce241040-lin-master-slave-communication" application with the desired name "LIN_master_slave" configured for the KIT_PSOC4-HVMS-64K_LITE BSP into the specified working directory, C:/mtb_projects:

project-creator-cli --board-id KIT_PSOC4-HVMS-64K_LITE --app-id mtb-example-ce241040-lin-master-slave-communication --user-app-name LIN_master_slave --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

Connect the board to your PC using the provided USB cable through the KitProg3 USB connector.
Program two boards as LIN master board and LIN slave board.
1. As shown in Figure 2, set the macro "LIN_MODE" to "MASTER_MODE" and program one device as a LIN master.
  
  Figure 2. Macro for master mode
2. As shown in Figure 3, set the macro "LIN_MODE" to "SLAVE_MODE" and program another device as a LIN slave.
  
  Figure 3. Macro for slave mode
3. If it is for the loop-back mode, as shown in Figure 4, set the macro "LIN_MODE" to "LOOP_BACK_MODE" and program just one device for internal LIN master and LIN slave communication.
  
  Figure 4. Macro for loop-back mode
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, each LED of the slave board blinks when each scheduled communication has been done. Table 2 shows LIN master, slave message frame format, and which LED blinks.

Table 2. LIN master board, LIN slave message frame format, and output

Master	Slave	Output (Slave LED blinking)
TX_HEADER	RX_HEADER	LED4
TX_RESPONSE	RX_RESPONSE	LED7
RX_RESPONSE	TX_RESPONSE	LED6

If the transmitted data and received data do not match on both the master and slave sides, the operation stops as an error.

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

Resources and settings

Table 3. Application resources

Resource	Alias/object	Purpose
LIN	LIN	Communication standard
HVSS	HVSS	To initialize LIN PHY
LED	CYBSP_LED4, CYBSP_LED6, CYBSP_LED7	To indicate succeeded LIN communication completion

Related resources

Resources	Links
Application notes	AN0034 – Getting started with PSOC™ 4 HV MS MCUs in ModusToolbox™
Device documents	PSOC™ 4 HV MS documents
Code examples	Using ModusToolbox™ on GitHub
Development kits	Select your kits from the Evaluation board finder
Libraries on GitHub	mtb-pdl-cat2 – PSOC™ 4 Peripheral Driver Library (PDL)
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: CE241040 – LIN master and slave communication with internal PHY

Version	Description of change
1.0.0	New code example
1.1.0	Changed PSoC HV MS kit name to PSOC4 and updated README.md description.

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