infineon / mtb-example-btsdk-cyw208xx-keyboard-scanner

This code example demonstrates the dedicated keyscan hardware which processes key press events from LHL GPIOs without interrupting the CPU core. This code example also demonstrates low power entry when the system is idle (no activity/keypress) and wakes up when there is key press.

AIROC™ CYW208xx Bluetooth® devices: HAL keyboard scanner

This code example demonstrates the dedicated keyscan hardware, which processes key press events from proprietary GPIOs (LHL GPIOs) without interrupting the CPU core. This code example also demonstrates low power entry when the system is idle (no activity or keypress) and wake up when there is key press. This code example is developed using ModusToolbox™ software integrated development environment.

Features demonstrated:

1. Functionality of keyscan with maximum possible buttons (that is, 63 in 7 rows * 9 columns) on CYW9208xxEVB-0X.
2. Configuring extended power down state (ePDS) low power mode and post wake-up.

View this README on GitHub.

Provide feedback on this code example.

Requirements

• ModusToolbox™ software v2.4 or later (tested with v2.4).

• Board support package (BSP) minimum required version: 3.0.0

• Programming language: C

• Associated parts: AIROC™ CYW20819 Bluetooth® & Bluetooth® LE system on chip, AIROC™ CYW20820 Bluetooth® & Bluetooth® LE system on chip

Supported toolchains (make variable 'TOOLCHAIN')

• GNU Arm® embedded compiler v9.3.1 (GCC_ARM) – Default value of TOOLCHAIN

Supported kits (make variable 'TARGET')

• CYW920820M2EVB-01 evaluation kit (CYW920820M2EVB-01) – Default value of TARGET
• CYW920819EVB-02 evaluation kit (CYW920819EVB-02)
• CYW920820EVB-02 evaluation kit (CYW920820EVB-02)

Hardware setup

This example uses the board's default configuration. See the kit user guide to ensure that the board is configured correctly. However, some of the default super-muxable functions are remapped to the keyscan hardware block.

Software setup

Install a terminal emulator if you don't have one. Instructions in this document use Tera Term. All other required software comes bundled with the ModusToolbox™ software.

To use a Windows PC as the Bluetooth® LE Central device for the GATT Client application, install CySmart host emulation tool. You will also need CY5677 CySmart Bluetooth® LE 4.2 USB dongle.

To use an iOS or Android smartphone as the Bluetooth® LE Central device, download the CySmart app. Scan the following QR codes from your mobile phone to download the CySmart app.

This example requires no additional software or tools.

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 HAL Keyboard Scanner 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}/ide_{version}/docs/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.

This 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 "HAL Keyboard Scanner" application with the desired name "MyKeyboardScanner" configured for the CYW920820M2EVB-01 BSP into the specified working directory, C:/mtb_projects:

project-creator-cli --board-id CYW920820M2EVB-01 --app-id mtb-example-btsdk-cyw208xx-keyboard-scanner --user-app-name MyKeyboardScanner --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).

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, and then import the libraries using the make getlibs command.

  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 USB connector.

   The USB serial interface on the kit provides access to the two UART interfaces of the CYW208xx/CYW207xx device: WICED HCI UART and WICED peripheral.

2. Open any serial terminal program and select the WICED PUART COM port. Set the serial port parameters to 8N1 and 115200 baud.

3. Program the board with the mtb-example-btsdk-cyw208xx-keyboard-scanner application.

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**.

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=CYW920820M2EVB-01 TOOLCHAIN=GCC_ARM
  ```

4. Following instructions appear on the terminal on application start.

   Figure 1. PUART messages

Design and implementation

The objective of the application is to demonstrate how you can make use of the keyboard scanner block available in the CYW20xxx Bluetooth® devices. This application also exhibits the procedure to configure ePDS low power mode when the keyscan block is inactive. This application uses custom board support package (BSP/design.modus) as it overrides the default LHL GPIO pin configurations with the help of super-mux functionality. See the datasheet for more details on super-mux functionality. The application also uses a 100 millisecond timer to track the key pressed time.

The following LHL GPIO pins are configured as keyscan rows and columns:

Table 1. Mapped rows to GPIO's

ROW	Mapped Px#
0	P0
1	P1
2	P2
3	P3
4	P4
5	P5
6	P6

Table 2. Mapped columns to GPIO's

COL	Mapped Px#
0	P8
1	P9
2	P10
3	P11
4	P12
5	P13
6	P14
7	P15
8	P17

This section explains the ModusToolbox™ software 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. Eclipse IDE for ModusToolbox™ software stores the configuration settings of the application in the design.modus file. This file is used by the graphical configurators, which generate the configuration firmware. This firmware is stored in the application’s GeneratedSource folder.

• Device configurator: Used to enable/configure the peripherals and the pins used in the application. See the Device configurator guide.

• Bluetooth® configurator: Used for generating/modifying the Bluetooth® LE GATT database. See the Bluetooth® configurator guide.

Related resources

Resources	Links
Application notes	AN225684 – Getting started with CYW208xx
Code examples	Using ModusToolbox™ software on GitHub Using Bluetooth® SDK
Device documentation	CYW20819 device datasheet CYW20820 device datasheet
Development kits	Visit https://www.infineon.com/cms/en/product/wireless-connectivity/airoc-bluetooth-le-bluetooth-multiprotocol/
Libraries on GitHub	btsdk-drivers – Bluetooth® SDK drivers library btsdk-mesh – Bluetooth® LE mesh libraries btsdk-ota – Bluetooth® LE OTA libraries btsdk-ble – Bluetooth® LE profile libraries
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. btsdk-utils – Bluetooth® SDK utilities btsdk-peer-apps-ota – Bluetooth® LE OTA peer applications btsdk-host-peer-apps – Bluetooth® LE mesh host and peer applications btsdk-host-apps-bt-ble – Bluetooth® and Bluetooth® LE host applications

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: CE229928 - AIROC™ CYW208xx Bluetooth® devices: HAL keyboard scanner

Version	Description of change
1.0.0	New code example
1.1.0	Folders restructured
2.0.0	Updated for ModusToolbox™ software v2.4 This version is not backward compatible with ModusToolbox™ software v2.1 Added CYW920820M2EVB-01 platform support

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