README.md

EZ-PD™ PMG1-S3 USB-C dock solution

This dock solution provides firmware for USB-C dock design with EZ-PD™ PMG1S3 MCU.

The following features are supported by the EZ-PD™ PMG1S3 USB-C dock solution:

1. Type-C port configuration and connection detection in Sink, Source, and Dual-role on Port 0 and Source role on Port 1

2. USB PD communication compliant with USB PD Revision 3.1 Version 1.8 specification

3. Extended Power Range (EPR) support of 140 W in Source role on Port 0

4. Support for VESA DisplayPort Alt mode on Type-C Standard Version 1.0, which is compatible with DisplayPort specifications 1.3 and 1.4

5. USBFS device support (Vendor, HID and Billboard classes)

6. Support for power protections such as the following:

   • VBUS overvoltage protection (VBUS OVP)
   • VBUS overcurrent protection (VBUS OCP)
   • VBUS short-circuit protection (VBUS SCP)
   • VBUS undervoltage protection (VBUS UVP)
   • VCONN overcurrent protection (VCONN OCP)

7. Dock Management Controller (DMC) features such as:

   • Signed/unsigned offline firmware update for EZ-PD™ PMG1-S3 and onboard component such as EZ-PD™ CCG7SC controllers
   • Smart power management
   • Supports storing and retrieving ETAG information (e.g., device serial number, MAC ID)

8. Drivers for MP4247 buck-boost controllers from Monolithic Power Systems and RichTek6190 regulators from Ricktek Technology

9. Host Processor Interface (HPI) master implementation for communication with EZ-PD™ CCG7SC slave devices

10. UART and internal flash logging mechanism for debugging

11. LED control (e.g., ON, OFF, Blink, Breath) driver for custom use cases in the dock design

12. Adapter detection logic

13. Deep sleep operation

View this README on GitHub.

Provide feedback on this code example.

Requirements

• ModusToolbox™ software v3.1 or later (tested with v3.1)
• Board support package (BSP) minimum required version: 3.0.0
• Programming language: C
• Associated parts: EZ-PD™ PMG1S3 MCU

Supported toolchains (make variable 'TOOLCHAIN')

• GNU Arm® Embedded Compiler v11.3.1 (GCC_ARM) – Default value of TOOLCHAIN

Supported hardware

This code example is developed to work with the EZ-PD™ PMG1-S3 USB-C dock board.

Note: See the schematics of the PMG1-S3 USB-C dock board for more details.

Hardware setup

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

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 EZ-PD™ Dock Tools. See EZ-PD™ Dock Tools for more details.

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 hardware.

   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 "EZ-PD™ PMG1-S3 USB-C Dock Solution" application with the desired name "PMG1S3USBCDock" configured for the PMG1S3DUAL BSP into the specified working directory, C:/mtb_projects:

project-creator-cli --board-id PMG1S3DUAL --app-id mtb-example-pmg1s3-usbc-dock --user-app-name PMG1S3USBCDock --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).

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).

Build flow

The EZ-PD™ PMG1-S3 USB-C Dock solution architecture supports asymmetric dual firmware images with a bootstrap image. The bootstrap image is available in the bootstrap directory of the application's root directory. Do the following to build and create a composite HEX file:

1. Build the application using one of the following methods. This will start the Firmware-1 build operation.

   Eclipse IDE

   Click the Build Application link in the Quick Panel (or, use Project > Build Project).

   Command line

   From the terminal, execute the `make build` command to build the default target. The default toolchain and target are specified in the application's Makefile.

   Example:

   make build -j8
   

2. On completion of the build, the post-build script for Firmware 1 is executed. This generates a .cyacd2 file for Firmware 1 and triggers the Firmware 2 build operation.

3. At the end of the Firmware 2 build operation, the post-build script is invoked again to generate the .cyacd2 file for Firmware 2 and create a composite HEX file consisting of Bootstrap, Firmware-1 and Firmware-2 images using cymcuelftool.

Operation

1. Ensure that the steps listed in the Hardware setup section are completed.

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).

   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 TARGET=APP_<BSP> TOOLCHAIN=<toolchain>
   

   Example:

   make program TARGET=APP_PMG1S3DUAL TOOLCHAIN=GCC_ARM
   

3. After programming, the application starts automatically.

4. See the Design and implementation section for details of the operation of the device.

Debugging

You can debug the example to step through the code.

In Eclipse IDE

1. In the application Makefile, set the CONFIG parameter to Debug and the APPNAME_EXT parameter to fw1 (for backup image) or fw2 (for primary image).

2. In the Eclipse IDE, click the Generate Launches for <Application Name> link in the Quick Panel.

3. Click 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 MiniProg4. See the "Debug mode" section in the kit user guide.

For more details, see the "Program and debug" section in the Eclipse IDE for ModusToolbox™ user guide.

Design and implementation

In this reference solution, the PMG1-S3 MCU is both a dock management controller (DMC) and PD controller. It provides the DMC functionality and controls two USB-C ports. When the device powers up, it executes the bootstrap image first. The bootstrap image performs integrity checks of both the firmware images. The primary firmware image (FW2) is prioritized over the backup firmware image (FW1). The primary firmware image is a full-featured firmware supporting all the DMC and PD features. The backup firmware is a reduced-feature firmware image with the ability to update PMG1-S3's primary firmware image from the SPI flash.

Figure 1. Firmware flowchart

The following sections provide a high-level description of the key firmware blocks used in the dock solution:

PdStack middleware

The PdStack middleware library configures the USBPD block on the PMG1-S3 MCU device to detect Type-C connection state changes and USBPD messages and notify the stack through callback functions. The callback functions are implemented in the PmgAppCommon middleware. The stack also provides notifications of various connection and PD policy state changes so that the rest of the system can be configured as required.

This application uses the "pmg1_pd3_drp_epr_cfg" library variant of PdStack middleware that supports USB Type-C Dual-role EPR operation and USB PD Revision 3.1 messaging along with configurability of library parameters through EZ-PD™ Dock Configuration Utility.

PdUtils middleware

The PdUtils middleware implements the software timer and utility functions required by the PMG1S3 device.

PdAltMode middleware

The PdAltMode middleware implements state machines to work with different USB PD Alternate modes. The PdAltMode middleware operates on top of the USBPD driver included in the ModusToolbox™ PDL CAT2 (mtb-pdl-cat2) Peripheral Driver Library (PDL), PdUtils, and PdStack middlewares. The middleware provides a set of PdAltMode APIs through which the application can initialize, monitor, and configure the PD Alternate mode operation.

The middleware also supports the Exchange Capabilities feature where depending on the alternate mode entered on the upstream port, the behavior of the downstream port is modified.

PmgAppCommon middleware

The PmgAppCommon middleware provides a set of files that are essential for a USB-C and Power Delivery application. It implements a set of callback functions that are registered with the PdStack middleware. These ,callback functions are used to perform board-specific tasks such as turning the consumer/provider power path ON/OFF and identifying the optimal source power profile to be used for charging.

Smart power

The dock solution uses the Smart Power feature for throttling power on the USB-C ports depending on the available power in the dock. PMG1-S3 periodically monitors the power consumed by the dock and adjusts the power on the upstream port depending on the available power.

USB interface

PMG1-S3 enumerates as a USB device presenting Vendor, HID and Billboard interfaces to the USB host.

• The Vendor interface is used for firmware update.

• The Billboard interface is used to communicate the Alternate modes supported by PMG1-S3 dock to a host system. If the dock is connected to a non-supported host device, a pop-up window shows the information of the device status.

• The HID interface supports the following use cases:

  • Sending and receiving custom reports from/to the USB host. This feature is used for the exchange of ETAG information between the host and PMG1-S3 dock.

  • USB suspend and wakeup option using system control HID input reports.

Note: For more information, see the EZ-PD™ PMG1-S3 Dock SDK user guide.

DMC firmware update

The DMC firmware update module allows updating of firmware on PMG1-S3 and connected onboard components. The firmware update process is split into two phases:

• Phase-1: A composite image is downloaded from the host over the USB Vendor interface to an external SPI flash.

• Phase-2: In this phase, PMG1-S3 updates itself and connected onboard components from the downloaded composite image.

EZ-PD™ Dock Firmware Update tool is used to send the composite image to the dock and also initiate the Phase-2 update. The dock notifies the tool at the end of Phase-1 completion; it continues its normal operation.

The dock initiates the Phase-2 update on receiving a trigger for Phase-2 from the EZ-PD™ Dock Firmware Update tool. There are two types of triggers: Update Now (1) or Update on US Disconnection (2).

Debug module

The Debug module is used for logging the failures and events of interest. The module supports the following types of logging:

• Logging through UART: The logs are transmitted over UART. The events and failures are prioritized based on the log levels. You can change this log level at compile time using the CY_APP_DEBUG_LEVEL macro.

• Storing logs into internal flash: The logs are stored in the internal flash of PMG1-S3. The following two types of information are stored into the internal flash:

  • Static information: Stores the number of occurrences of predefined failures.
  • Dynamic information: Stores the last few failure details into the internal flash.

Note: For more information, see the EZ-PD™ PMG1-S3 Dock SDK user guide.

LED control module

The LED control module is used to control LEDs connected to the GPIOs of PMG1-S3.The module can control the LED to work in the following modes.

Mode	Description
CY_LED_CTRL_LED_OFF	LED is turned OFF
CY_LED_CTRL_LED_ON	LED is turned ON
CY_LED_CTRL_LED_BLINKING	LED is set to blink
CY_LED_CTRL_LED_BREATHING	Slow ramp up and down of LED brightness to give a visual breathing effect on the LED

Note: For more information, see the EZ-PD™ PMG1-S3 Dock SDK user guide.

Buck-boost controller

EZ-PD™ PMG1-S3 USB-C dock solution supports external DC-DC buck-boost controllers (MP4247 from Monolithic Power Systems and RT6190 from Richtek Technologies) to supply the required voltage and current. These buck-boost controllers can provide power up to 140 W.

HPI master

The Host Processor Interface (HPI) protocol allows for communication between an embedded controller (EC) or a host processor and other EZ-PD™ CCGx PD controllers. This protocol is based on the master and slave concept, allowing the master to monitor the PD status, change configurations, and perform a firmware update of the slave devices. HPI is implemented over the I2C protocol. In the dock solution, PMG1-S3 acts as the HPI master and other CCGx devices present act as HPI slave devices. The HPI master is provided in the form of a pre-compiled library.

Adapter detection

Adapter detection is used to find the power rating of the connected adapter. On the EZ-PD™ PMG1-S3 USB-C Dock board, this is determined by a combination of jumpers and a resister divider circuit. The module monitors the ADC voltage on a dedicated GPIO and calculates the adapter power based on predetermined voltage levels. See the following table for jumper settings for various power ratings.

J23	J24	J25	Adapter power
OPEN	OPEN	OPEN	Undefined
OPEN	OPEN	CLOSE	120 W
OPEN	CLOSE	OPEN	135 W
OPEN	CLOSE	CLOSE	150 W
CLOSE	OPEN	OPEN	180 W
CLOSE	OPEN	CLOSE	200 W
CLOSE	CLOSE	OPEN	230 W
CLOSE	CLOSE	CLOSE	280 W

Flash memory map

The internal flash of PMG1-S3 is used to store a bootstrap image, two firmware images with their corresponding configuration tables and metadata, dock metadata, and telemetry data. The flash memory map for the device is shown in Figure 3.

Figure 3. Flash layout

The bootstrap image is allocated a fixed 4 KB of memory at the start of the flash space. This area can only be written to from the SWD interface.

The configuration table holds the default dock configuration for the dock application parameters. It is located at the beginning of each firmware binary and the size of each configuration table is 2560 bytes.

The firmware area is used for the dock firmware application. FW1 uses the space from 4 KB to 68 KB while FW2 uses 68 KB to 252 KB. The remaining space is used for storing debug logs, dock metadata and the metadata of the two firmware images.

Compile-time configurations

This application functionality can be customized through a set of compile-time parameters that can be turned ON/OFF through the Makefile. See the EZ-PD™ PMG1-S3 Dock SDK user guide for more information.

Resources and settings

Table 1. Application resources

Resource	Alias/object	Purpose
USBPD0	PD_PORT0	USBPD block used for PD communication
USBPD1	PD_PORT1	USBPD block used for PD communication
SCB0	I2C_HPIM	SCB block used for I2C communication with CCG7SC
SCB4	I2C_PWR_MUX	SCB block used for I2C communication with buck-boost converter and current sense devices
SCB5	CYBSP_UART	SCB block used for sending UART debug logs
SCB7	FLASH_SPI	SCB block used for SPI flash read and write
USB0	CYBSP_USBDEV	USBFS block used for firmware update (Vendor interface), HID interface and Billboard Interface
GPIO2.0	LAN_WAKE_BTN	User switch to signal PD extended alert message for the controller-initiated wake event
GPIO3.0	LED_CTRL	User LED which is controlled to be turned ON/OFF or made to blink or breathe based on certain application events
GPIO7.2	POWER_BTN	User switch to signal PD extended alert message for the button press and button release events

Application files and their usage

File	Purpose
src/custom_altmode/custom_altmode_vid.c & .h	Defines data structures and function prototypes and implements functions for custom alternate mode support
src/dmc/ccgx_ctrl.c & .h	Defines function prototypes and implements functions to handle EZ-PD™ CCGx firmware update
src/dmc/cryptolite_rsa.c & .h	Defines function prototypes and implements RSA signature verification
src/dmc/dmc_flashing.c & .h	Defines function prototypes and implements functions for DMC (PMG1-S3) firmware update
src/dmc/dmc_solution.c & .h	Defines function prototypes and implements functions for initialization of DMC interfaces
src/dmc/etag.c & .h	Defines data structures and function prototypes associated with the storage and retrieval of the ETAG information
src/dmc/spi_eeprom_master.c & .h	Defines function prototypes and implements functions for SPI master interface to SPI EEPROM slave
src/mux/anx7443.h	Defines function prototypes for ANX7443 MUX driver from Analogix
src/mux/pericom_pi3usb31532.c & .h	Defines function prototypes and implements driver for PERICOM PI3USB31532 mux
src/app_version.h	Defines application firmware version
src/pmg1_version.h	Defines the base firmware stack version
src/solution.c & .h	Defines function prototypes and implements solution-specific functions
src/usb_descr.c and .h	Defines data structure and implements functions to update USB descriptors
src/usb_hid.c & .h	Defines data structures and function prototypes associated with the HID interface
config/config.c	Defines dock configuration table
config.h	Defines macro for the application configuration
main.c	Implements application main function

Related resources

Resources	Links
Application notes	AN232553 – Getting started with EZ-PD™ PMG1 MCU on ModusToolbox™ software AN232565 – EZ-PD™ PMG1 MCU hardware design guidelines and checklist
Code examples	Using ModusToolbox™ on GitHub
Device documentation	PMG1 datasheets
Development kits	Select your kits from the Evaluation board finder
Libraries on GitHub	mtb-pdl-cat2 – Peripheral Driver Library (PDL) and docs
Middleware on GitHub	pdstack – PdStack middleware library and docs pdutils – PdUtils middleware library and docs pdaltmode – PdAltMode middleware library and docs pmg-app-common – PMG Application Common middleware library and docs USB device – USB device library and docs HPI – Host Processor Interface middleware library and docs
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.

Note: For more information about the software modules and configuration options, see the EZ-PD™ PMG1-S3 Dock SDK user guide.

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: CE239400 – EZ-PD™ PMG1-S3 USB-C dock solution

Version	Description of change
1.0.0	New code example

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