README.md

# EZ-PD™ PMG1 MCU: USBPD sink

This code example demonstrates USB Type-C attach detection and USB Power Delivery contract negotiation using EZ-PD™ PMG1 MCU devices.

[View this README on GitHub.](https://github.com/Infineon/mtb-example-pmg1-usbpd-sink)

[Provide feedback on this code example.](https://cypress.co1.qualtrics.com/jfe/form/SV_1NTns53sK2yiljn?Q_EED=eyJVbmlxdWUgRG9jIElkIjoiQ0UyMzE4NTYiLCJTcGVjIE51bWJlciI6IjAwMi0zMTg1NiIsIkRvYyBUaXRsZSI6IkVaLVBEJnRyYWRlOyBQTUcxIE1DVTogVVNCUEQgc2luayIsInJpZCI6Im1kZGQiLCJEb2MgdmVyc2lvbiI6IjMuMS4wIiwiRG9jIExhbmd1YWdlIjoiRW5nbGlzaCIsIkRvYyBEaXZpc2lvbiI6Ik1DRCIsIkRvYyBCVSI6IldJUkVEIiwiRG9jIEZhbWlseSI6IlRZUEUtQyJ9)

## Requirements

- [ModusToolbox™ software](https://www.infineon.com/modustoolbox) 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](https://www.infineon.com/PMG1) parts

## Supported toolchains (make variable 'TOOLCHAIN')

- GNU Arm® embedded compiler v10.3.1 (`GCC_ARM`) - Default value of `TOOLCHAIN`
- Arm® compiler v6.16 (`ARM`)
- IAR C/C++ compiler v9.30.1 (`IAR`)

## Supported kits (make variable 'TARGET')

- [EZ-PD™ PMG1-S0 prototyping kit](https://www.infineon.com/CY7110) (`PMG1-CY7110`) - Default value of `TARGET`
- [EZ-PD™ PMG1-S1 prototyping kit](https://www.infineon.com/CY7111) (`PMG1-CY7111`)
- [EZ-PD™ PMG1-S2 prototyping kit](https://www.infineon.com/CY7112) (`PMG1-CY7112`)
- [EZ-PD™ PMG1-S3 prototyping kit](https://www.infineon.com/CY7113) (`PMG1-CY7113`)

## Hardware setup

1. Connect the board to your PC using the USB cable through the KitProg3 USB connector. This cable is used for programming the EZ-PD™ PMG1 device. Additionally, it is used during debugging.

2. Connect the USBPD port to the USB-C power adapter or your PC using the USB Type-C cable. This cable is used for the USB power delivery source and it provides power to the user LED.

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


## Software setup

This example requires no additional software or tools.

## Using the code example

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

<details><summary><b>In Eclipse IDE for ModusToolbox&trade; software</b></summary>

1. Click the **New Application** link in the **Quick Panel** (or, use **File** > **New** > **ModusToolbox&trade; Application**). This launches the [Project Creator](https://www.infineon.com/ModusToolboxProjectCreator) tool.

2. 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](https://www.infineon.com/ModusToolboxLibraryManager) 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.

3. In the **Project Creator - Select Application** dialog, choose the example by enabling the checkbox.

4. (Optional) Change the suggested **New Application Name**.

5. 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.

6. Click **Create** to complete the application creation process.

For more details, see the [Eclipse IDE for ModusToolbox&trade; software user guide](https://www.infineon.com/MTBEclipseIDEUserGuide) (locally available at *{ModusToolbox&trade; software install directory}/docs_{version}/mt_ide_user_guide.pdf*).

</details>

<details><summary><b>In command-line interface (CLI)</b></summary>

ModusToolbox&trade; 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&trade; 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&trade; software installation instead of a standard Windows command-line application. This shell provides access to all ModusToolbox&trade; 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](https://github.com/Infineon?q=bsp-manifest&type=&language=&sort=) manifest | Required
`--app-id`   | Defined in the `<id>` field of the [CE](https://github.com/Infineon?q=ce-manifest&type=&language=&sort=) 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

<br />

The following example clones the "[USBPD Sink](https://github.com/Infineon/mtb-example-pmg1-usbpd-sink)" application with the desired name "MyUsbPdSink" configured for the *PMG1-CY7110* BSP into the specified working directory, *C:/mtb_projects*:

   ```
   project-creator-cli --board-id PMG1-CY7110 --app-id mtb-example-pmg1-usbpd-sink --user-app-name MyUsbPdSink --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&trade; software user guide](https://www.infineon.com/ModusToolboxUserGuide) (locally available at *{ModusToolbox&trade; software install directory}/docs_{version}/mtb_user_guide.pdf*).

To work with a different supported kit later, use the [Library Manager](https://www.infineon.com/ModusToolboxLibraryManager) to choose the BSP for the supported kit. You can invoke the Library Manager GUI tool from the terminal using the `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

<br />

Following example adds the PMG1-CY7110 BSP to the already created application and makes it the active BSP for the app:

   ```
   library-manager-cli --project "C:/mtb_projects/MyUsbPdSink" --add-bsp-name PMG1-CY7110 --add-bsp-version "latest-v3.X" --add-bsp-location "local"

   library-manager-cli --project "C:/mtb_projects/MyUsbPdSink" --set-active-bsp APP_PMG1-CY7110
   ```

</details>

<details><summary><b>In third-party IDEs</b></summary>

Use one of the following options:

- **Use the standalone [Project Creator](https://www.infineon.com/ModusToolboxProjectCreator) tool:**

   1. Launch Project Creator from the Windows Start menu or from *{ModusToolbox&trade; 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.

<br />

- **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&trade; software user guide](https://www.infineon.com/ModusToolboxUserGuide) (locally available at *{ModusToolbox&trade; software install directory}/docs_{version}/mtb_user_guide.pdf*).

</details>

## Operation

1. Ensure that the steps listed in the [Hardware setup](#hardware-setup) section are complete.

2. Ensure that the jumper shunt on power selection jumper (J5) is placed at position 2-3 while programming the kit.

3. Program the board using one of the following:

   <details><summary><b>Using Eclipse IDE for ModusToolbox&trade; software</b></summary>

      1. Select the application project in the Project Explorer.

      2. In the **Quick Panel**, scroll down, and click **\<Application Name> Program (KitProg3_MiniProg4)**.
   </details>

   <details><summary><b>Using CLI</b></summary>

     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
      ```
   </details>

4. After programming the kit, change the position on power selection jumper (J5) to 1-2 to power the kit through the USBPD port. Do not change the jumper (J5) position while the cables are connected to power source.

5. The User LED (LED3) on the board will blink at different rates depending on the type of power adapter connected:

   - If a power adapter supporting USB Power Delivery is connected, the LED blinks at about 5 Hz (toggles every 100 ms).

   - If a USB Type-C power adapter or a standard downstream port (SDP) is connected, the LED blinks at about 1 Hz (toggles every 500 ms).

   - If a dedicated charging port (DCP) is connected, the LED blinks at about 0.17 Hz (toggles every 3 seconds).

   - If a charging downstream port (CDP) is connected, the LED blinks at about 0.05 Hz (toggles every 10 seconds).

## 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 that the jumper shunt on the power selection jumper (J5) is placed at position 1-2. 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&trade; software user guide](https://www.infineon.com/MTBEclipseIDEUserGuide).

## Design and implementation

EZ-PD&trade; PMG1 MCU devices support a USBPD block which integrates Type-C terminations, comparators, and the Power Delivery transceiver required to detect the attachment of a partner device and negotiate power contracts with it.

On reset, the USBPD block is initialized with the following settings:

   - The receiver clock input of the block is connected to a 12-MHz PERI-derived clock.

   - The transmitter clock input of the block is connected to a 600-kHz PERI-derived clock.

   - The SAR ADC clock input of the block is connected to a 1-MHz PERI-derived clock.

   - The SAR ADC in the USBPD block is configured to measure the VBUS_TYPE-C voltage through an internal divider.

This application uses the PDStack middleware library in an upstream facing port (UFP) - sink configuration. EZ-PD&trade; PMG1 MCU devices have a dead-battery Rd termination, which ensures that a USB-C source/charger connected to it can detect the presence of a sink even when the EZ-PD&trade; PMG1 MCU device is not powered.

**Figure 1. Firmware flowchart**

<img src = "images/pdsinkflow.png" width = "300"/>
<br>

The PDStack middleware library configures the USBPD block on the EZ-PD&trade; PMG1 MCU device to detect Type-C connection state changes and USBPD messages, and notify the stack through callback functions. The callback function registers the pending tasks, which are then handled by PDStack through the `Cy_PdStack_Dpm_Task` function. This function is expected to be called at appropriate times from the main processing loop of the application.

**Figure 2. PDStack task flowchart**

<img src = "images/pdstacktask.png" width = "600"/>

<br>

The PDStack middleware library implements the state machines defined in the [USB Type-C Cable and Connector](https://www.usb.org/document-library/usb-type-cr-cable-and-connector-specification-revision-20) and the [USB Power Delivery](https://www.usb.org/document-library/usb-power-delivery) specifications. PDStack consists of the following main modules:

- **Type-C manager:** Responsible for detecting a Type-C connection and identifying the type of connection. It uses the configurable Rp/Rd terminations provided by the USBPD block and the internal line state comparators. The Type-C manager implements the state machines defined in the *USB Type-C Cable and Connector specification* and provides the following functionality:

    - *Manage CC terminations*: Applies Rp/Rd terminations according to the port role

    - *Attach detection*: Perform the required debounce and determine the type of device attached

    - *Detach detection*: Monitor the CC line and VBus for detecting a device detach

- **Protocol Layer:** Forms the messages used to communicate between a pair of ports/cable plugs. It is responsible for forming capabilities messages, requests, responses, and acknowledgements. It receives inputs from the policy engine indicating which messages to send and relays the responses back to the policy engine.

- **Policy engine:** Provides a mechanism to monitor and control the USB Power Delivery system within a particular consumer, provider, or cable plug. It implements the state machines defined in the *USB Power Delivery* specification and contains implementations of all PD atomic message sequences (AMS). It interfaces with the protocol layer for PD message transmission/reception for controlling the reception of message types according conditions such as the current state of the port. It also interfaces with the Type-C manager for error conditions like Type-C error recovery.

- **Device policy manager (DPM):** Provides an interface to the application layer to initialize, monitor, and configure the PDStack middleware operation. The DPM provides the following functionality:

    - Initialize the policy engine and Type-C manager

    - Start the Type-C state machine followed by the policy engine state machine

    - Stop and disable the Type-C port

    - Allow entry/exit from deep sleep to achieve low power based on the port status

    - Provide APIs for the application to send PD/Type-C commands

    - Provide event callbacks to the application for application-specific handling

The PDStack library uses a set of callbacks registered by the application to perform board-specific tasks such as turning the consumer power path ON/OFF and identifying the optimal source power profile to be used for charging. In this example, these functions are implemented using the appropriate APIs provided as part of the peripheral driver library (PDL).

The stack also provides notification of various connection and PD policy state changes so that the rest of the system can be configured as required. These events are used by the example application to implement a separate USB Battery Charging 1.2 sink state machine, which distinguishes between a standard downstream port (SDP), charging downstream port (CDP), and dedicated charging port (DCP).

The BC 1.2 sink state machine is activated only when the power source connected does not support USB Power Delivery. The GPIO connected to LED3 on the board is toggled at different rates to indicate the type of power source, which is detected by the PDStack library and the BC 1.2 sink state machine.

The application tries to keep the EZ-PD&trade; PMG1 MCU device in deep sleep, where all clocks are disabled and only limited hardware blocks are enabled, for most of its working time. Interrupts in the USBPD block are configured to detect any changes that happen while the device is in sleep, and wake it up for further processing.

An overvoltage (OV) comparator in the USBPD block is used to detect cases where the power source is supplying incorrect voltage levels, and automatically shut down the power switches to protect the rest of the components on the board.

### Compile-time configurations

The EZ-PD&trade; PMG1 MCU USBPD sink application functionality can be customized through a set of compile-time parameters that can be turned ON/OFF through the *config.h* header file.

 Macro name          | Description                           | Allowed values 
 :------------------ | :------------------------------------ | :------------- 
 `CY_PD_SINK_ONLY`     | Specifies that the application supports only the USBPD sink (consumer) role | Should be set to 1u 
 `NO_OF_TYPEC_PORTS`   | Specifies the number of USB-C ports supported | Should be set to 1u 
 `CY_PD_REV3_ENABLE`   | Enable USBPD Revision 3.0 support | 1u or 0u 
 `PD_PDO_SEL_ALGO`     | Specifies the algorithm to be used while selecting the best source capability to power the board | 0u - Pick the source PDO delivering the maximum amount of power <br> 1u - Pick the fixed source PDO delivering the maximum amount of power <br>2u - Pick the fixed source PDO delivering the maximum amount of current<br>3u - Pick the fixed source PDO delivering the maximum amount of voltage 
 `VBUS_FET_CTRL`       | Selects the gate driver to be used to turn the consumer power path ON (applicable only for  CY7110) | 0u - Gate driver which does not support internal pull-up <br> 1u - Gate driver which supports pull-up for faster turn off 
 `BATTERY_CHARGING_ENABLE` | Enables BC 1.2 (CDP/DCP) detection when connected to a non-USBPD power source | 1u or 0u 
 `SNK_STANDBY_FET_SHUTDOWN_ENABLE` | Specifies whether the consumer power path should be disabled while PD contracts are being negotiated | 1u or 0u 
 `SYS_DEEPSLEEP_ENABLE` | Enables device entry into deep sleep mode for power saving when the CPU is idle | 1u or 0u 
 `APP_FW_LED_ENABLE` | Enables toggling of the user LED (LED3) based on the type of power source | 1u or 0u 

<br>

### PDStack library selection

The USB Type-C connection manager, USB Power Delivery (USBPD) protocol layer, and USBPD device policy engine state machine implementations are provided in the form of pre-compiled libraries as part of the PDStack middleWare library.

Multiple variants of the PDStack library with different feature sets are provided; you can choose the appropriate version based on the features required by the target application.

   - *PMG1_PD3_SNK_LITE*: Library with support for USB Type-C sink operation and USBPD Revision 3.0 messaging. This library is chosen by default.

   - *PMG1_PD2_SNK_LITE*: Library with support for USB Type-C sink operation and USBPD Revision 2.0 messaging. Using this library will reduce the flash (code) memory usage by the application.

The library of choice can be selected by editing the *Makefile* in the application folder and changing the value of the `COMPONENTS` variable. To use the PD Revision 2.0 library, replace the `PMG1_PD3_SNK_LITE` reference with `PMG1_PD2_SNK_LITE`.


### USBPD port configuration

The properties of the USB-C port including port role and the default response to various USBPD messages can be configured using the EZ-PD&trade; configurator utility.

These parameters have been set to the appropriate values for a Power Delivery sink application by default. To view or change the configuration, click on the **EZ-PD&trade; Configurator 1.20** item under **Tools** in the Quick Panel to launch the configurator.

**Figure 3. USB Type-C port configuration using EZ-PD&trade;  Configurator**

<img src = "images/ezpd_port_info.png" width = "800"/>

<br>

Properties of the USB-C port are configured using the *Port Information* section. Because this application supports only the USBPD sink operation, the **Port Role** must be set as **Sink** and **DRP Toggle** must be disabled. Other parameters such as **Manufacturer Vendor ID** and **Manufacturer Product ID** can be set to desired values.

The **Source PDO** and **SCEDB Configuration** sections are not applicable for this application because only the sink operation is supported.

**Figure 4. Sink capability configuration using EZ-PD&trade; configurator**

<img src = "images/ezpd_sink_pdo.png" width = "800"/>

<br>

The power capabilities supported by the application in the sink role are specified using the *Sink PDO* section. See the *USB Power Delivery* specification for details on how to encode the various sink capabilities. A maximum of seven PDOs can be added using the configurator.

**Figure 5. Extended sink capability configuration using EZ-PD&trade; configurator**

<img src = "images/ezpd_ext_snk_cap.png" width = "800"/>

<br>

The *SKEDB* section is used to input the extended sink capabilities response that will be sent by the application when queried by the power source. See the Power Delivery specification for details on the extended sink capabilities format.

Once the parameters have been updated as desired, save the configuration and build the application.

For quick verification of the application configurability, disable the **PD Operation** parameter under **Port Information**. When the EZ-PD&trade; PMG1 MCU device is programmed with this modification, you can see that the user LED blinks at a slower rate even when connected to a power source which supports USB Power Delivery.

### Resources and settings

**Table 1. Application resources**

 Resource  | Alias/object   | Purpose
 :-------  | :------------  | :------------------------------------
 USBPD     | PD_PORT0       | USBPD block used for PD communication
 LED (BSP) | CYBSP_USER_LED | User LED to indicate connection state

<br>

### List of application files and their usage

 File                         | Purpose
 :--------------------------- | :------------------------------------
 *src/app/app.c & .h*                | Defines data structures, function prototypes and implements functions to handle application-level USB Type-C and PD events 
 *src/app/charger_detect.c & .h*     | Defines data structures, function prototypes and implements functions to handle BC 1.2 charger detection 
 *src/app/fault_handlers.c*          | Implements functions to handle the various faults related to USB Type-C and PD 
 *src/app/pdo.c & .h*                | Defines function prototypes and implements functions to evaluate source capabilities (Power Data Object)
 *src/app/psink.c & .h*              | Defines function prototypes and implements functions for power consumer path control
 *src/app/swap.c & .h*               | Defines function prototypes and implements functions to evaluate the USBPD role swap requests
 *src/app/vdm.c & .h*                | Defines data structures, function prototypes and implements functions to handle Vendor Defined Messages (VDM)
 *src/system/instrumentation.c & .h* | Defines data structures, function prototypes and implements functions to monitor CPU resource usage

<br>

## Related resources

Resources | Links
-----------|------------------
Application notes |[AN232553](https://www.infineon.com/an232553) – Getting started with EZ-PD&trade; PMG1 MCU on ModusToolbox&trade; software <br> [AN232565](https://www.infineon.com/an232565) – EZ-PD&trade; PMG1 MCU hardware design guidelines and checklist
Code examples | [Using ModusToolbox&trade; software](https://github.com/Infineon?q=mtb-example-pmg1%20NOT%20Deprecated) on GitHub
Device documentation | [EZ-PD&trade; PMG1 MCU datasheets](https://www.infineon.com/PMG1DS)
Development kits | Select your kits from the [Evaluation board finder](https://www.infineon.com/cms/en/design-support/finder-selection-tools/product-finder/evaluation-board) page.
Libraries on GitHub | [mtb-pdl-cat2](https://github.com/Infineon/mtb-pdl-cat2) – Peripheral driver library (PDL) and docs
Middleware on GitHub  | [pdstack](https://github.com/Infineon/pdstack) – PDStack middleware library and docs <br> [pdutils](https://github.com/Infineon/pdutils) – PDUtils middleware library and docs
Tools | [Eclipse IDE for ModusToolbox&trade; software](https://www.infineon.com/modustoolbox) <br> ModusToolbox&trade; 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: *CE231856* – *EZ-PD&trade; PMG1 MCU: USBPD sink*

 Version | Description of change
 ------- | ---------------------
 1.0.0   | New code example
 2.0.0   | Switched to default BSP from custom BSP
 2.1.0   | PD 2.0 Compliance & Build Error fix
 3.0.0   | Updated to support ModusToolbox&trade; software v3.0 and BSPs v3.X. This version is not backward compatible with previous versions of ModusToolbox™ software
 3.1.0   | Added structured VDM minor version support

<br>

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