AIROC™ CYW43907 Wi-Fi scan

This example demonstrates how to configure different scan filters provided in the Wi-Fi connection manager (WCM) middleware and scan for the available Wi-Fi networks.

The example initializes the Wi-Fi device, starts a Wi-Fi scan without any filter, and prints the results on the serial terminal. The example starts a scan every three seconds after the previous scan completes. Press the user button to change the type of scan filter applied and print the scan results on the serial terminal. Press the button again to observe the scan output for a different scan filter. The type of scan filter applied wraps around to no filter when the number of button presses exceeds the number of supported scan filters.

View this README on GitHub.

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Requirements

ModusToolbox™ software v3.1 or later (tested with v3.1)
Board support package (BSP) minimum required version: 1.0.0
Programming language: C
Associated parts: AIROC™ CYW43907 embedded wireless SoC

Supported toolchains (make variable 'TOOLCHAIN')

GNU Arm® embedded compiler v11.3.1 (GCC_ARM) - Default value of TOOLCHAIN

Supported kits (make variable 'TARGET')

AIROC™ CYW43907 embedded wireless SoC kit (CYW943907AEVAL1F) – Default value of TARGET

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

Install a terminal emulator if you don't have one. Instructions in this document use PuTTY.

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

Click the New Application link in the Quick Panel (or, use File > New > ModusToolbox™ Application). This launches the Project Creator tool.
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.
In the Project Creator - Select Application dialog, choose the example by enabling the checkbox.
(Optional) Change the suggested New Application Name.
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.
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}/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.

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 "mtb-example-cyw43907-wifi-scan" application with the desired name "WifiScan" configured for the CYW943907AEVAL1F BSP into the specified working directory, C:/mtb_projects:

project-creator-cli --board-id CYW943907AEVAL1F --app-id mtb-example-cyw43907-wifi-scan --user-app-name WifiScan --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

Following example adds the CYW943907AEVAL1F BSP to the already created application and makes it the active BSP for the app:

~/ModusToolbox/tools_{version}/library-manager/library-manager-cli --project "C:/mtb-example-cyw43907-wifi-scan" --add-bsp-name CYW943907AEVAL1F --add-bsp-version "latest-v1.X" --add-bsp-location "local"

~/ModusToolbox/tools_{version}/library-manager/library-manager-cli --project "C:/mtb-example-cyw43907-wifi-scan" --set-active-bsp APP_CYW943907AEVAL1F

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.

Export the application to a supported IDE using the make <ide> command.
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

Connect the board to your PC using the provided USB cable through the micro-USB connector.
Add the filter parameters to the SCAN_FOR_SSID_VALUE, SCAN_FOR_MAC_ADDRESS, SCAN_FOR_BAND_VALUE, and SCAN_FOR_RSSI_VALUE macros defined in scan_task.h.
Open a terminal program and select the respective COM port. Set the serial port parameters to 8N1 and 115200 baud.
Program the board using one of the following:
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 (FTDI).
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 these values manually:
```
make program TARGET=<BSP> TOOLCHAIN=<toolchain>
```
Example:
```
make program TARGET=CYW943907AEVAL1F TOOLCHAIN=GCC_ARM
```
By default, there is no scan filter applied as shown in the sample output.

Figure 1. Scan output with no filter

Note: The serial terminal output contains duplicate SSID scan results because the WHD successively scans each channel and it may detect multiple probe responses from a network while scanning in the channel is occupied by the network.
Press the user button to switch to the SSID scan filter, which scans only the network whose SSID is present in the SCAN_FOR_SSID_VALUE.

Figure 2. Scan output with SSID filter
Press the user button (SW1) to switch to the MAC address scan filter, which scans only the network whose MAC address is present in the SCAN_FOR_MAC_ADDRESS.

Figure 3. Scan output with MAC address
Press SW1 again to switch to the ISM band scan filter, which scans only for the networks that advertize in the frequency band provided in SCAN_FOR_BAND_VALUE.

Figure 4. Scan output with frequency band filter
Press SW1 again to switch to the RSSI range scan filter, which scans only for the networks whose RSSI is better than the RSSI provided in SCAN_FOR_RSSI_VALUE.

Figure 5. Scan output with RSSI filter
Press SW1 again to wrap around to scan with no filter.

Debugging

You can debug the example to step through the code. In the IDE, use the <Application Name> Debug (FTDI) 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 main function initializes the user button (CYBSP_SW1), user LED (CYBSP_USER_LED2), and UART, and creates scan_task before starting the FreeRTOS scheduler. The scan_task is responsible for initializing the Wi-Fi device and starting the scan based on the filter type. The WCM middleware supports the following filter types:

No filter: All the Wi-Fi networks are provided to the scan callback function.
Filtering for SSID: The scan callback receives only the networks whose SSID matches with the SSID filter parameter.
Filtering for MAC address: The scan callback receives only the networks whose MAC address matches with the MAC address filter parameter.
Filtering for frequency band: The scan callback receives only the networks that advertize in the frequency band provided as the filter parameter.
Filtering for RSSI: The scan callback receives only the networks that have RSSI greater than the RSSI provided as the filter parameter.

The scan callback function is executed under the context of the WCM middleware's worker thread. After the scan is completed, the scan callback sends a task notification to scan_task because cy_wcm_start_scan is a non-blocking function and returns without waiting for the scan to complete.

In this example, you can switch to a different type of filter by pressing SW1. An ISR increments the scan_filter_mode_select global variable of the scan_filter_mode enumeration type to let the scan_task know the type of the filter to be applied. The value of scan_filter_mode is reset to SCAN_FILTER_NONE when the variable is incremented to SCAN_FILTER_INVALID.

Resources and settings

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
GPIO (HAL)	CYBSP_USER_LED2	Turns ON when there is an irrecoverable error
GPIO (HAL)	CYBSP_SW1	Used to change the type of Wi-Fi scan filter applied

Related resources

Resources	Links
Code examples	Using ModusToolbox™ software on GitHub
Device documentation	AIROC™ CYW43907 datasheet
Development kits	Select your kits from the evaluation board finder
Libraries on GitHub	mtb-hal-cat4 – AIROC™ CYW43907 Hardware abstraction layer (HAL) library retarget-io – Utility library to retarget STDIO messages to a UART port
Middlewares on GitHub	ModusToolbox™ software – Links to all ModusToolbox™ middlewares, libraries and documents
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: CE234099 - AIROC™ CYW43907 Wi-Fi scan

Version	Description of change
1.0.0	New code example
2.0.0	Major update to support ModusToolbox™ v3.1 and BSPs v1.0.0 This version is not backward compatible with previous versions (below ModusToolbox™ v3.0) of ModusToolbox™ software

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