AIROC&trade: Bluetooth® LE PAwR Server

This code example demonstrates the implementation of a Bluetooth® LE custom service with Bluetooth® security using AIROC™ CYW20829/CYW89829 devices and ModusToolbox™ software environment.

View this README on GitHub.

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Requirements

• ModusToolbox™ software v3.0 or later (tested with v3.0)
• Board support package (BSP) minimum required version for:
  • CYW920829M2EVK-02: v1.0.2
  • CYW989829M2EVB-01: v1.0.1
• Programming language: C
• Associated parts: AIROC™ CYW20829 Bluetooth® LE SoC

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')

• AIROC™ CYW20829 Bluetooth® LE Evaluation Kit(CYW920829M2EVK-02) – Default value of TARGET
• [AIROC™ CYW89829 Bluetooth® LE evaluation kit] (CYW989829M2EVB-01)

Hardware setup

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

Note: The AIROC™ CYW20829 Bluetooth® kit (CYW920829M2EVK-02) ships with KitProg3 version 2.21 installed. The ModusToolbox™ software requires KitProg3 with latest version 2.40. 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 If you do not upgrade, you will see an error such as "unable to find CMSIS-DAP device" or "KitProg firmware is out of date".

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

1. Click the New Application link in the Quick Panel (or, use File > New > ModusToolbox™ Application). This launches the Project Creator 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 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™ software user guide (locally available at {ModusToolbox™ software install directory}/docs_{version}/mtb_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 clones the "LE PAwR Server" application with the desired name "MyPAwRServer" configured for the CYW920829M2EVK-02/CYW989829M2EVB-01 BSP into the specified working directory, C:/mtb_projects:

project-creator-cli --board-id CYW920829M2EVK-02 --app-id mtb-example-btstack-freertos-pawr-server --user-app-name "MyPAwRServer" --target-dir "C:/mtb_projects"
project-creator-cli --board-id CYW989829M2EVB-01 --app-id mtb-example-btstack-freertos-pawr-client --user-app-name "MyPAwRServer" --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

The following example adds the CYW20829/CYW89829 BSP to the already created application and makes it the active BSP for the app:

library-manager-cli --project "C:/mtb_projects/MyPAwRServer" --add-bsp-name CYW920829M2EVK-02 --add-bsp-version "latest-v4.X" --add-bsp-location "local"

library-manager-cli --project "C:/mtb_projects/MyPAwRServer" --set-active-bsp APP_CYW920829M2EVK-02

library-manager-cli --project "C:/mtb_projects/MyPAwRServer" --add-bsp-name CYW989829M2EVB-01 --add-bsp-version "latest-v4.X" --add-bsp-location "local"

library-manager-cli --project "C:/mtb_projects/MyPAwRServer" --set-active-bsp APP_CYW989829M2EVB-01

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

1. Connect the board to your PC using the provided USB cable through the KitProg3 USB connector.

2. Use your favorite serial terminal application tool and connect to the KitProg3 COM port. Configure the terminal application to access the serial port using the following settings:

   Baud rate: 115200 bps; Data: 8 bits; Parity: None; stop: 1 bit; Flow control: None; New line for receiving data: Line Feed (LF) or auto setting

3. Program the board using one of the following:

   Using Eclipse IDE for ModusToolbox™ software

   1. Select the application project in 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 TARGET=<BSP> TOOLCHAIN=<toolchain>
   

   Example:

   make program TARGET=CYW920829M2EVK-02 TOOLCHAIN=GCC_ARM
   make program TARGET=CYW989829M2EVB-01 TOOLCHAIN=GCC_ARM
   

4. After programming, PAwR Client and multiple PAwR Server the application starts automatically. Observe the messages on the UART terminal, and wait for PAwR Central and Peripheral sync established. Use the KitProg3 COM port to view the Bluetooth® stack and application trace messages in the terminal window: the PAwR Client and Server will exchange data.

5. Configure the PAwR parameters

   In the PAwR Client:

   Parameter	Description
   PAWR_EVT_PERIOD	Event period
   PAWR_SUB_EVT_PERIOD	Sub event period
   PAWR_SUB_EVT_NUM	Sub event number
   PAWR_RESPONSE_DELAY	Response delay
   PAWR_RESPONSE_SPACE	Response space

   In the PAwR Server

   Parameter	Description
   PAWR_PERIPHERAL_RSP_SLOT	Response slot

The log from the PAwR Client show that the PAwR Client receives a response from the PAwR Server. The log from the PAwR Server show that the PAwR receives a response report from the PAwR Client.

Steps to enable BTSpy logs

1. Navigate to the application Makefile and open it. Find the Makefile variable ENABLE_SPY_TRACES and set it to the value 1 as shown:

   ENABLE_SPY_TRACES = 1
   

2. Save the Makefile, and then build and program the application to the board.

3. Open the ClientControl application and make the following settings:

   • Set the baud rate to 3000000.
   • Deselect flow control.
   • Select the serial port and click on an open port.

4. Launch the BTSpy tool.

5. Press and release the reset button on the board to get the BTSpy logs on the BTSpy tool.

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

Design and implementation

The code example configures the device as a Bluetooth® Periodic Advertisement with Response (PAwR) Server, which works with the PAwR Client. The PAwR Client starts extended advertising with the PAwR parameters and PAwR advertising. The PAwR Server starts scan when it finds the PAwR configuration in extended advertising, and then starts to sync with the PAwR Client using PAwR parameters.

After the PAwR Server is synced with the PAwR Client, the PAwR Client can send data to the PAwR Server using PAwR indication event; the PAwR Server will respond with its data using the PAwR Response event. The PAwR Client and Server receive data in a sub event; the response slot can be seen in the UART log.

The application uses a UART resource from the Hardware Abstraction Layer (HAL) to print debug messages on a UART terminal emulator. The UART resource initialization and retargeting of standard I/O to the UART port are done using the retarget-io library.

Log from PAwR client	Log from PAwR server
central addr:	central addr:
C0:01:02:03:04:05	C0:01:02:03:04:05
set_pawr_params:	peripheral addr:
status:0,	C0:00:00:01:00:00
pawr_evt_period:4000,
sub_evt_period:250,
sub_evt_num:16
... ...	... ...
pawr start	pawr start
rcv:se:0,sl:0,cnt:1	rcv:se:0,cnt:1
rcv:se:1,sl:0,cnt:1	rcv:se:1,cnt:1
rcv:se:0,sl:0,cnt:2	rcv:se:0,cnt:2
rcv:se:1,sl:0,cnt:2	rcv:se:1,cnt:2
rcv:se:0,sl:0,cnt:3	rcv:se:0,cnt:3
rcv:se:1,sl:0,cnt:3	rcv:se:1,cnt:3

PAwR client receive message from server at subevt0 and subevt1 in slot0. PAwR server receive message from client at subevt0 and subevt1.

Resources and settings

This section explains the ModusToolbox™ software resources and their configurations as used in this code example. Note that all the configurations explained in this section have already been implemented in the code example.

• Device Configurator: ModusToolbox™ software stores the configuration settings of the application in the design.modus file. This file is used by the Device Configurator, which generates the configuration firmware. This firmware is stored in the application’s GeneratedSource folder.

  By default, all applications in a workspace share the same design.modus file - i.e., they share the same pin configuration. Each BSP has a default design.modus file in the mtb_shared\TARGET_<bsp name><version>\COMPONENT_BSP_DESIGN_MODUS directory. It is not recommended to modify the configuration of a standard BSP directly.

  To modify the configuration for a single application or to create a custom BSP, see the ModusToolbox™ user guide. This example uses the default configuration. See the Device Configurator guide.

• Bluetooth® Configurator: The Bluetooth® peripheral has an additional configurator called the “Bluetooth® Configurator” that is used to generate the Bluetooth® LE GATT database and various Bluetooth® settings for the application. These settings are stored in the file named design.cybt.

  Note that unlike the Device Configurator, the Bluetooth® configurator settings and files are local to each respective application. The services and characteristics added are explained in the Design and implementation section. See the Bluetooth® Configurator guide.

Note: For CYW20829/CYW89829, if you want to use the Bluetooth® Configurator tool, select the AIROC™ BTSTACK with Bluetooth® LE only (CYW20829/CYW89829, PSoC™ 6 with CYW43xxx Connectivity device) option from the drop-down menu to select the device. Do not use the PSoC™ Bluetooth® LE Legacy Stack (PSoC™ 6-BLE) option because it is not compatible with AIROC™ BTSTACK.

Table 1. Application resources

Resource	Alias/object	Purpose
UART (HAL)	cy_retarget_io_uart_obj	UART HAL object used by Retarget-IO for Debug UART port

Related resources

Resources	Links
Application notes	AN228571 – Getting started with PSoC™ 6 MCU on ModusToolbox™ software AN215656 – PSoC™ 6 MCU: Dual-CPU system design
Code examples	Using ModusToolbox™ software on GitHub
Device documentation	PSoC™ 6 MCU datasheets PSoC™ 6 technical reference manuals AIROC™ CYW20829 Bluetooth® LE SoC [AIROC™ CYW89829 Bluetooth® LE SoC]
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	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 and Bluetooth® connectivity 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: CE238989 – AIROC™: Bluetooth® LE PAwR Server

Version	Description of change
1.0.0	New code example
1.1.0	Add support for CYW989829M2EVB-01

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