EZ-PD™ PMG1 MCU: I2C multi-master

This PMG1 code example demonstrates how to configure an SCB in I2C master-slave configuration to send and receive I2C data and toggle the state of the onboard LEDs. The PMG1 SCB when configured in master-slave mode can act as both master and slave. By default the I2C interface acts as a slave .When the user button on the kit is pressed , the I2C interface switches to master mode and sends the LED state to the partner device . I2C interfce becomes slave again after the data is transmitted. A second PMG1 Kit is recommended for testing this code example.

View this README on GitHub.

Provide feedback on this code example.

Requirements

ModusToolbox™ software v3.0 or later (tested with v3.0)
Board support package (BSP) minimum required version: 3.0.0
Programming language: C
Associated parts: All EZ-PD™ PMG1 MCU parts

Supported toolchains (make variable 'TOOLCHAIN')

GNU Arm® Embedded Compiler v10.3.1 (GCC_ARM) - Default value of TOOLCHAIN
Arm® Compiler v6.13 (ARM)
IAR C/C++ Compiler v8.42.2 (IAR)

Supported kits (make variable 'TARGET')

EZ-PD™ PMG1-S0 prototyping kit (PMG1-CY7110)
EZ-PD™ PMG1-S1 prototyping kit (PMG1-CY7111) - Default value of TARGET
EZ-PD™ PMG1-S2 prototyping kit (PMG1-CY7112)
EZ-PD™ PMG1-S3 prototyping kit (PMG1-CY7113)

Hardware setup

A kit listed in Supported kits runs this code example and a second PMG1 kit, loaded with this same code example (but with a different slave address, as mentioned in the Operations section) is recommended for testing this code example.

Use jumper wires to establish an I2C connection between the two PMG1 kits using the pin assignments for the different supported kits as follows:

Table 1. Pin connections for I2C

PMG1 prototyping kit SDA SCL Ground

PMG1-CY7110 J7.7 J7.6 J7.3

PMG1-CY7111 J7.7 J7.6 J7.3

PMG1-CY7112 J7.7 J7.6 J7.3

PMG1-CY7113 J7.6 J7.7 J7.3

Connect the SDA line of kit 1 to the SDA line of kit 2. Similarly, connect the SCL and ground lines.

If UART DEBUG PRINT messages are enabled, UART connection are needed. Pin connections for UART is as shown in the below table. For the following revisions of the PMG1 prototyping kits, connect the UART Tx and UART Rx lines from the PMG1 kit to J3.8 and J3.10 on KitProg3 respectively to establish a UART connection between KitProg3 and the PMG1 device.

Table 2. Pin connections for UART

PMG1 kit	UART Tx	UART Rx
PMG1-CY7110	---	---
PMG1-CY7111 (revision 2 or lower)	J6.10 to J3.8	J6.9 to J3.10
PMG1-CY7112 (revision 2 or lower)	J6.10 to J3.8	J6.9 to J3.10
PMG1-CY7113 (revision 3 or lower)	J6.10 to J3.8	J6.9 to J3.10

Notes:

All prototyping kits with a higher revision have UART lines internally connected. Therefore, external wiring is not required.
UART is disabled for PMG1-S0 kit in this code example because both the kit UART (P1.2 and P1.3 with hardware connection to KitProg) and the kit I2C (P2.2 and P2.3 with onboard pull-ups) use the same SCB 1 block on the PMG1-S0 kit.

See the kit user guide for more details on configuring the board.

Software setup

Install a terminal emulator if you don't have one. Instructions in this document use Tera Term.

Using the code example

Create the project and open it using one of the following:

In Eclipse IDE for ModusToolbox™ software

Click the New Application link in the Quick Panel (or, use File > New > ModusToolbox™ Application). This launches the Project Creator tool.
Pick a kit supported by the code example from the list shown in the Project Creator - Choose Board Support Package (BSP) dialog.

When you select a supported kit, the example is reconfigured automatically to work with the kit. To work with a different supported kit later, use the Library Manager to choose the BSP for the supported kit. You can use the Library Manager to select or update the BSP and firmware libraries used in this application. To access the Library Manager, click the link from the Quick Panel.

You can also just start the application creation process again and select a different kit.

If you want to use the application 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.
In the Project Creator - Select Application dialog, choose the example by enabling the checkbox.
(Optional) Change the suggested New Application Name.
The Application(s) Root Path defaults to the Eclipse workspace which is usually the desired location for the application. If you want to store the application in a different location, you can change the Application(s) Root Path value. Applications that share libraries should be in the same root path.
Click Create to complete the application creation process.

For more details, see the Eclipse IDE for ModusToolbox™ software user guide (locally available at {ModusToolbox™ software install directory}/docs_{version}/mt_ide_user_guide.pdf).

In command-line interface (CLI)

ModusToolbox™ software provides the Project Creator as both a GUI tool and the command line tool, "project-creator-cli". The 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™ software 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™ software installation instead of a standard Windows command-line application. This shell provides access to all ModusToolbox™ software 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 "project-creator-cli" tool has the following arguments:

Argument	Description	Required/optional
`--board-id`	Defined in the `<id>` field of the BSP manifest	Required
`--app-id`	Defined in the `<id>` 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

The following example will clone the "I2C multi-master" application with the desired name "MyI2C multi-master" configured for the PMG1-CY7111 BSP into the specified working directory, C:/mtb_projects:

project-creator-cli --board-id PMG1-CY7111 --app-id mtb-example-pmg1-i2c-multi-master --user-app-name MyI2Cmulti-master --target-dir "C:/mtb_projects"

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™ software user guide (locally available at {ModusToolbox™ software install directory}/docs_{version}/mtb_user_guide.pdf).

To work with a different supported kit later, use the Library Manager to choose the BSP for the supported kit. You can invoke the Library Manager GUI tool from the terminal using make library-manager command or use the Library Manager CLI tool "library-manager-cli" to change the BSP.

The "library-manager-cli" tool has the following arguments:

Argument	Description	Required/optional
`--add-bsp-name`	Name of the BSP that should be added to the application	Required
`--set-active-bsp`	Name of the BSP that should be as active BSP for the application	Required
`--add-bsp-version`	Specify the version of the BSP that should be added to the application if you do not wish to use the latest from manifest	Optional
`--add-bsp-location`	Specify the location of the BSP (local/shared) if you prefer to add the BSP in a shared path	Optional

Following example adds the PMG1-CY7111 BSP to the already created application and makes it the active BSP for the app:

~/ModusToolbox/tools_3.0/library-manager/library-manager-cli --project "C:/mtb_projects/MyI2Cmulti-master" --add-bsp-name PMG1-CY7111--add-bsp-version "latest-v3.X" --add-bsp-location "local"

~/ModusToolbox/tools_3.0/library-manager/library-manager-cli --project "C:/mtb_projects/MyI2Cmulti-master" --set-active-bsp APP_PMG1-CY7111

In third-party IDEs

Use one of the following options:

Use the standalone Project Creator tool:
1. Launch Project Creator from the Windows Start menu or from {ModusToolbox™ software install directory}/tools_{version}/project-creator/project-creator.exe.
2. In the initial Choose Board Support Package screen, select the BSP, and click Next.
3. In the Select Application screen, select the appropriate IDE from the Target IDE drop-down menu.
4. Click Create and follow the instructions printed in the bottom pane to import or open the exported project in the respective IDE.

Use command-line interface (CLI):
1. Follow the instructions from the In command-line interface (CLI) section to create the application.
2. Export the application to a supported IDE using the make <ide> command.
3. Follow the instructions displayed in the terminal to create or import the application as an IDE project.

For a list of supported IDEs and more details, see the "Exporting to IDEs" section of the ModusToolbox™ software user guide (locally available at {ModusToolbox™ software install directory}/docs_{version}/mtb_user_guide.pdf).

Operation

Choose any two of the PMG1 prototyping kits from the list of supported kits and ensure that the steps listed in the Hardware setup section are completed.
Ensure that the jumper shunt on power selection jumper (J5) is placed at position 2-3 to enable programming.
Connect the first PMG1 kit to your PC using the USB cable through the KitProg3 USB Type-C port (J1). This cable is used for programming the PMG1 device and as a USB-UART bridge to the PC during operation.
Verify that the PMG1_KIT_1_ADDRESS_ENABLE macro in the I2CMasterSlave.h file is uncommented and make sure the PMG1_KIT_2_ADDRESS_ENABLE macro is commented out.

Figure 1. Kit address macro setting for kit 1
Program the PMG1 kit using one of the following:
Using Eclipse IDE for ModusToolbox™ software
1. Select the application project in the Project Explorer.
2. In the Quick Panel, scroll down, and click <Application Name> Program (KitProg3_MiniProg4).
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 and target are specified in the application's Makefile but you can override those values manually:
```
make program TOOLCHAIN=<toolchain>
```
Example:
```
make program TOOLCHAIN=GCC_ARM
```
After programming the first kit, disconnect the USB cable and change the position on the power selection jumper (J5) to 1-2 to power the kit through the PMG1 USB PD sink port (J10).
Now, for the second PMG1 kit, uncomment the PMG1_KIT_2_ADDRESS_ENABLE macro in the I2CMasterSlave.h file and ensure that the PMG1_KIT_1_ADDRESS_ENABLE macro is commented out.

Figure 2. Kit address macro setting for kit 2
Connect and program the second kit by using Step 5.
After programming the kits, disconnect the USB cable and change the position on the power selection jumper (J5) to 1-2 to power the kits through the PMG1 USB PD sink port (J10).
Confirm that the LED on the second kit toggles each time the user button on the first kit is pressed and vice versa.

Debugging

You can debug the example to step through the code. In the IDE, use the <Application Name> Debug (KitProg3_MiniProg4) configuration in the Quick Panel. Ensure that the board is connected to your PC using the USB cable through the KitProg3 USB connector and the jumper shunt on power selection jumper (J5) is placed at position 1-2.

See the "Debug mode" section in the kit user guide for debugging the application on CY7110 prototyping kit. For more details, see the "Program and debug" section in the Eclipse IDE for ModusToolbox™ software user guide.

Design and implementation

In this code example, the PMG1 SCB block is configured as I2C in master-slave mode.

When the switch on one kit is pressed, the kit acts as the master and sends an I2C read command to the second kit. The second kit acts as the slave, and so sends the current state of the user LED on the slave. The master then sends the command to invert the state of the LED on the slave based on the current status of the LED read from the slave previously.

Both kits initially configure the I2C read buffer with the Header, the Kit BSP Number, the Status of the LED, and a Footer. When a master triggers an I2C read operation, this I2C read buffer is used by the slave to respond back to the master.

The kit BSP number is used only to identify the PMG1 kit BSP of the master or slave that was addressed, when printing it to the UART terminal. THis is not used for any checks.

Figure 5 shows the firmware flowchart for the design.

Figure 5. Firmware flowchart

SCB0 is used for I2C communication (except PMG1-S0 where SCB1 is used for I2C) and is configured for master-slave operation with the 'Store Config in Flash' option deselected. This allows the modification of the I2C configurations during run time. This is done for changing the slave address assigned for the kit from firmware (See line 117 in I2CMasterSlave.c).

Figure 6. I2C configuration

Packet format read by the master from the slave (status packet)

The master sends the I2C read command to read the current state of the LED on the second kit that acts as the slave. The read command will retrieve three bytes of data from the slave, which consist of a Header, the Kit BSP Number of the slave, the Status of the LED, and a Footer. The master decides the command to send to the slave to invert the state of the LED based on the Status read from the slave.

Header	BSP	Status	Footer
0xDC	KIT BSP Number	0x76(LED OFF) or 0xE3(LED ON)	0x89

Packet format sent by the master to the slave (command packet)

The master writes the command packet (to the slave) to set the state of the slave LED based on the LED status packet read previously from the slave. To do this, the master populates the I2C write buffer with a Header followed by the Kit BSP Number of the master, Command to set or reset the LED state of the slave, and a Footer. This command packet is decoded by the slave which will then set the LED state according to the received command only if the header and footer are received correctly.

Header	BSP	Command	Footer
0xDC	KIT BSP Number	0x76(LED OFF) or 0xE3(LED ON)	0x89

SCB 2 (SCB 4 in case of PMG1-S3 kit) is initialized as UART to receive and send data from and to a terminal emulator. To implement the UART data transfer on the SCB hardware block, UART Peripheral Driver Library (PDL) APIs are used. The UART is initialized with the following settings:

Baud rate: 115200
Data width: 8 bits
Parity: None
Stop bit: 1
The clock input of the block is connected to a 48-MHz PERI-derived clock

Note: SCB on the PMG1-S0 kit is not configured for UART operation in the code example.

Compile-time configurations

The EZ-PD™ PMG1 MCU I2C multi-master application functionality can be customized through a set of compile-time parameters that can be turned ON/OFF through the main.c and I2CMasterSlave.h files.

Macro name	Description	Allowed values
`DEBUG_PRINT`	Debug print macro to enable UART print For S0 - Debug print will be always zero as SCB UART is not available	Should be set to 1u to enable 0u to disable
`PMG1_KIT_1_ADDRESS_ENABLE`	PMG1_KIT_1_ADDRESS_ENABLE is Uncommented and PMG1_KIT_2_ADDRESS_ENABLE is commented while programming the first Kit	----------
`PMG1_KIT_2_ADDRESS_ENABLE`	PMG1_KIT_2_ADDRESS_ENABLE is Uncommented and PMG1_KIT_1_ADDRESS_ENABLE is commented while programming the second Kit	----------

Resources and settings

Table 3. Application resources

Resource	Alias/object	Purpose
SCB (I2C) (PDL)	CYBSP_I2C_HW	I2C block configured for master-slave mode
SCB (UART) (PDL)	CYBSP_UART_HW	UART block used to send debug message via terminal
GPIO (PDL)	CYBSP_USER_LED	User LED
SWITCH (BSP)	CYBSP_USER_BUTTON	User button to start the send of LED toggle commands to slave via I2C

Related resources

Resources	Links
Application notes	AN232553 – Getting started with EZ-PD™ PMG1 MCU on ModusToolbox™ software AN232565 – EZ-PD™ PMG1 hardware design guidelines and checklist
Code examples	Using ModusToolbox™ software on GitHub
Device documentation	EZ-PD™ PMG1 MCU datasheets
Development kits	Select your kits from the Evaluation Board Finder page.
Libraries on GitHub	mtb-pdl-cat2 – Peripheral driver library (PDL) and docs
Tools	Eclipse IDE for ModusToolbox™ software ModusToolbox™ software is a collection of easy-to-use software and tools enabling rapid development with Infineon MCUs, covering applications from embedded sense and control to wireless and cloud-connected systems using AIROC™ Wi-Fi & Bluetooth® combo devices.

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: CE234777 – EZ-PD™ PMG1 MCU: I2C multi-master

Version	Description of change
1.0.0	New code example
2.0.0	Major update to support ModusToolbox™ v3.0. This version is not backward compatible with previous versions of ModusToolbox™

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