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This code example demonstrates the implementation of a simple BLE GAP Peripheral - GATT Client with Current Time Service using the Cypress Combo (Wi-Fi+BT) SoCs

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Bluetooth® LE CTS client

This code example demonstrates the implementation of a simple AIROC™ Bluetooth® LE GAP Peripheral - GATT Client with Current Time Service (CTS) using PSoC™ 6 MCU, AIROC™ CYW20829/CYW89829, and ModusToolbox™ software environment.

In this code example, the kit advertises as 'CTS Client' and after connection with a CTS-based server, enables notifications for the 'Current Time' characteristic. The time and date received through the notification are printed on the serial terminal.

This code example along with Bluetooth® LE CTS Server CE are low-power enabled for Bluetooth® LE and can be used to measure the current consumption by PSoC™ 6 (not optimized for power) and CYW43xxx when using AIROC™ Bluetooth® LE feature. See AN227910: Low-power system design with CYW43012 and PSoC™ 6 MCU to learn about Bluetooth® power optimization techniques and power measurement using this CE.

Use this code example with Bluetooth® LE CTS Server.

View this README on GitHub.

Provide feedback on this code example.

Requirements

Supported toolchains (make variable 'TOOLCHAIN')

  • GNU Arm® Embedded Compiler v11.3.1 (GCC_ARM) – Default value of TOOLCHAIN
  • Arm® Compiler v6.16 (ARM)
  • IAR C/C++ Compiler v9.30.1 (IAR)

Supported kits (make variable 'TARGET')

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 PSoC™ 6 Bluetooth® LE Pioneer Kit (CY8CKIT-062-BLE) and the PSoC™ 6 Wi-Fi Bluetooth® Pioneer Kit (CY8CKIT-062-WIFI-BT) ship with KitProg2 installed. ModusToolbox™ requires KitProg3. 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 If you do not upgrade, you will see an error like "unable to find CMSIS-DAP device" or "KitProg firmware is out of date".

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

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.

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 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.

  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 "Bluetooth® LE CTS client" application with the desired name "WPSenrollee" configured for the CY8CKIT-062-WIFI-BT BSP into the specified working directory, C:/mtb_projects:

project-creator-cli --board-id CY8CKIT-062-WIFI-BT --app-id mtb-example-btstack-freertos-cts-client --user-app-name CTSClient --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

If using a PSoC™ 64 "Secure" MCU kit (like CY8CKIT-064B0S2-4343W), the PSoC™ 64 device must be provisioned with keys and policies before being programmed. Follow the instructions in the "Secure Boot" SDK user guide to provision the device. If the kit is already provisioned, copy-paste the keys and policy folder to the application folder.

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

  2. Open a terminal program and select the KitProg3 COM port. Set the serial port parameters to 8N1 and 115200 baud.

  3. 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

  4. After programming, the application starts automatically. Observe the messages on the UART terminal. Use the KitProg3 COM port to view the Bluetooth® stack and application trace messages in the terminal window as shown in Figure 1.

    Figure 1. Terminal output when the device is programmed with the CE

  5. Use another supported PSoC™ 6 kit and program it with the Bluetooth® LE CTS Server code example.

  6. Press the user button (SW2) on the kit to start high duty advertisement. After 30 seconds, if the device is still not connected, it switches to low-duty advertisements without timeout.

    Figure 2. Terminal output showing connection

  7. After connecting with the CTS Server device, press the same user button (SW2) to enable or disable notifications.

    Figure 3. Terminal output showing notifications

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

Note: (Only while debugging PSoC™ 6 MCU) On the CM4 CPU, some code in main() may execute before the debugger halts at the beginning of main(). This means that some code executes twice – once before the debugger stops execution, and again after the debugger resets the program counter to the beginning of main(). See KBA231071 to learn about this and for the workaround.

Design and implementation

The code example configures the device as a AIROC™ Bluetooth® LE GAP Peripheral and GATT Client. Current Time Service(CTS) is showcased in the example. The device advertises with the name 'CTS Client'. After connection with the AIROC™ Bluetooth® LE Central device, it sends a Service Discovery (by UUID) request. If the CTS UUID is present in the server GATT database, the client device enables notifications for CTS by writing into the Client Characteristic Configuration Descriptor (CCCD). The date and time notifications received are printed on the terminal.

A user button is used to start advertisement or enable/disable notifications from the server device.

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.

Power measurement: Implementation of low power for AIROC™ Bluetooth® LE

This examples enables you to measure the power consumption in three different AIROC™ Bluetooth® LE states: Standby, Advertising, and Connected. Do the following to enter each state and the measure the power consumption for different kits.

  1. Standby state: After programming the device, AIROC™ Bluetooth® LE is initialized and stays in standby state. On the terminal, check for the message 'Bluetooth® stack initialization successful'; you can measure the power consumption for standby state.

  2. Advertising state: Press the user button (SW2) on your kit to start advertising. Note that the kit with the CTS Server CE must not be scanning when advertising is started because the peer will send a connection request as soon as it discovers the device. High duty advertisements start and stay for 30 seconds. After 30 seconds, the device switches to low duty advertisements. If required, this configuration can be changed using the 'bt-configurator' tool that comes with ModusToolbox™ installation.

  3. Connected state: Start scanning on the CTS Server and ensure that the kit is advertising. Once the scanner finds the advertiser, connection is established. The terminal displays the message 'Connected : BDA xx:xx:xx:xx:xx:xx'.

Current measuring points for kits

CY8CKIT-062S2-43012, CYW9P62S1-43438EVB-01, CYW9P62S1-43012EVB-01 and CY8CKIT-064B0S2-4343W

For PSoC™ 6 MCU:

  1. Remove J25 to eliminate leakage currents across potentiometer R1.

  2. Measure the current at J15 across VTARG and P6_VDD.

For CYW43xxx:

  • Measure the current at VBAT across VBAT and VCC_VBAT at J8.

CY8CEVAL-062S2-LAI-4373M2

For PSoC™ 6 MCU:

  1. Remove J21 to eliminate leakage currents across potentiometer R1.

  2. Measure the current at J15 across VTARG and P6_VDD.

For CYW4373E:

  • Measure the current at VBAT across VBAT and VCC_VBAT at J11.

CY8CPROTO-062-4343W

For PSoC™ 6 MCU:

  1. Remove R65 on the right of the board close to the USB connector of the PSoC™ 6 MCU device.

  2. Connect an ammeter between VTARG (J2.32) and P6_VDD (J2.24).

  3. Remove R24 at the back of the board, below J1.9, to eliminate the leakage current.

    R24 is the pull-up resistor attached to the WL_HOST_WAKE pin P0_4, which leaks approximately 330 µA because P0_4 is driven LOW when there is no network activity. In total, the PSoC™ 6 MCU deep sleep current is approximately 350 µA.

For CYW4343W:

  1. Measure the current at VBAT1 and VBAT2 supplies used for powering CYW4343W. VBAT1 and VABT2 are shorted to each other.

  2. Remove R87 on the back of the board towards the right and above J2.33.

  3. Connect an ammeter between the pads of R87 to measure the current.

CY8CKIT-062-WIFI-BT

For PSoC™ 6 MCU:

  • Measure the current by connecting an ammeter to the PWR MON jumper J8.

For CYW4343W:

  • Measure the current at WL_VBAT (used for powering CYW4343W) by removing L3 along the right edge of the board close to the CYW4343W module, and connecting an ammeter between the pads of L3.

CY8CPROTO-062S3-4343W

For PSoC™ 6 MCU:

  • Measure the current by removing R59 and connecting an ammeter across VTARG (J2.32) and P6_VDD (J2.31)

For CYW4343W:

  • Measure the current by removing R55 and connecting an ammeter between the resistor pads (VCC_3V6 and VBAT_WL).

Table 1 captures the current numbers measured using this CE for two BSPs. The kits have different connectivity devices - CYW43012 and CYW43438. The measurement is not performed in a radio isolated environment. The current consumption by the PSoC™ 6 device is also measured; it was identical across all Bluetooth® states. The average current value is given below:

  1. For PSoC™ 6 device in CY8CKIT-062S2-43012: 27 µA

  2. For PSoC™ 6 device in CYW9P62S1-43438EVB-01: 620 µA

  3. For PSoC™ 6 device in CY8CEVAL-062S2-LAI-4373M2: 23 µA

Table 1. Current consumption

Bluetooth® state Setting CY8CKIT-062S2-43012 CYW9P62S1-43438EVB-01 CY8CEVAL-062S2-LAI-4373M2
Standby Stack initialized 3.65 mA 4.20 mA 8.4 mA
High duty advertisement ADV interval: 30 ms 1.37 mA 2.15 mA 3.34 mA
Low duty advertisement ADV interval: 1.28 s 43 µA 70 µA 480 µA
Connected Conn interval: 8.75 ms 1.88 mA 3.16 mA 7.05 mA
Connected Conn interval: 10 ms 1.66 mA 2.7 mA 5.09 mA
Connected Conn interval: 50 ms 410 µA 594 µA 1.32 mA
Connected Conn interval: 500 ms 60.17 µA 213 µA 652.3 µA
Connected Conn interval: 1 s 46.6 µA 69.32 µA 495 µA

Resources and settings

This section explains the ModusToolbox™ resources and their configuration as used in this code example. Note that all the configuration explained in this section has already been done in the code example.

  • Device Configurator: ModusToolbox™ 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 refer to the ModusToolbox™ user guide. This example uses the default configuration.

    For detailed information on how to use the Device Configurator, see the Device Configurator guide.

  • Bluetooth® Configurator: The Bluetooth® peripheral has an additional configurator called the “Bluetooth® Configurator” that is used to generate the AIROC™ 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.

    For detailed information on how to use the Bluetooth® Configurator, see the Bluetooth® Configurator guide.

Note: For PSoC™ 6 Bluetooth® LE-based BSPs (CY8CKIT-062-BLE, CY8CPROTO-063-BLE, CYBLE-416045-EVAL) with support for AIROC™ BTSTACK, if you want to use the bt-configurator tool, select the AIROC™ BTSTACK with Bluetooth® LE only (CYW20829, PSoC™ 6 with CYW43xxx Connectivity device) option from the dropdown 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 2. Application resources

Resource Alias/object Purpose
UART (HAL) cy_retarget_io_uart_obj UART HAL object used by Retarget-IO for Debug UART port
GPIO (HAL) CYBSP_USER_BTN Start advertisement or enable/disable notification

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™ on GitHub
Device documentation PSoC™ 6 MCU datasheets
PSoC™ 6 technical reference manuals
AIROC™ CYW20829 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 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.

For PSoC™ 6 MCU devices, see How to design with PSoC™ 6 MCU – KBA223067 in the Infineon Developer Community.

Document history

Document title: CE230304 – Bluetooth® LE CTS Client

Version Description of change
1.0.0 New code example
2.0.0 Major update to support ModusToolbox™ software v2.3.1,
This version is not backward compatible with ModusToolbox™ software v2.2 or older versions,
Added support for new kits
Enabled for CYW43xxx Low power and addition of current number
3.0.0 Added support for CYW43439 kit
Updated BSP to 3.0.0
4.0.0 Updated to support ModusToolbox™ software v3.0 and BSPs v4.x
4.1.0 Added support for CYW920829M2EVB-01,CY8CKIT-062-BLE,CY8CPROTO-063-BLE, CYBLE-416045-EVAL
4.2.0 Added support for CY8CEVAL-062S2-LAI-43439M2,CY8CPROTO-062S2-43439
4.3.0 Removed CYW920829M2EVB-01 from supported kits
Added support for CYW920829M2EVK-02
4.4.0 Added support for CY8CEVAL-062S2-MUR-4373EM2 and CY8CEVAL-062S2-MUR-4373M2
4.4.1 README.md update
4.5.0 Update the README with new template and added support for CYW989829M2EVB-01 and CY8CEVAL-062S2-CYW43022CUB
4.6.0 Added support for CY8CKIT-062S2-AI
5.0.0 BSP and BTStack-integration major update for BT Firmware as a separate asset and removal of combo devices as doesn't support fw as separate asset
5.1.0 Added support for CY8CEVAL-062S2-CYW955513SDM2WLIPA

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The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc., and any use of such marks by Infineon is under license.

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This code example demonstrates the implementation of a simple BLE GAP Peripheral - GATT Client with Current Time Service using the Cypress Combo (Wi-Fi+BT) SoCs

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bluetooth cy8ckit-062-wifi-bt cy8cproto-062-4343w cy8ckit-062-ble cy8cproto-063-ble cy8ckit-062s2-43012 cy8cproto-062s3-4343w cyw9p62s1-43438evb-01 cyw9p62s1-43012evb-01 cy8ckit-064b0s2-4343w cy8ceval-062s2 cy8ceval-062s2-lai-4373m2 cy8ceval-062s2-mur-43439m2 cyble-416045-eval cy8ceval-062s2-lai-43439m2 cyw920829m2evk-02 cy8ceval-062s2-mur-4373em2 cy8ceval-062s2-mur-4373m2 cy8ceval-062s2-cyw43022cub cyw989829m2evb-01

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