Introduction

This instructional guide offers a detailed walkthrough of the hardware and software setup necessary to run the demo app on STM32U575I-EV with IF513. Given that we are using IF513 in M.2 2230 E Key form factor for SDIO, and the STM32U575I-EV board does not have an M.2 slot but includes a micro-SD slot, it becomes essential to employ an M.2 to micro-SD adapter for seamless compatibility.

Prerequisites

The STM32U575I-EV is a development board designed for the STM32 microcontroller, providing a platform for evaluation and prototyping.
IF513 DVK (part number: 453-00186-K1) contains the Module, Sona IF513, M.2, Key E, SDIO, UART (part number: 453-00186), CABLINE VSII 40P cable and micro-SD adapter.
STM32CubeMX is a tool used to generate code by integrating STM32 platform firmware and additional packages.
STM32CubeIDE serves as an IDE for compiling applications, flashing them to STM32xx, and debugging via the ST-Link(JTAG-like debug interface)
Infineon’s STM32 expansion pack v1.7.0, available at Infineon GitHub repository, includes essential resources to support Wi-Fi and Bluetooth functionalities on STM32 platforms.

Hardware setup

The IF513 DVK kit includes a micro-SD adapter and CABLINE VSII 40P cable, which should be connected as depicted in the image below. Additionally, CON2 should receive power from a 12V/1A power supply.

Jumper wire should be connected between CN8, pin#1 on STM32U575I-EV and J6, pin#1 (WL_REG_ON) to enable power to the WLAN radio. This GPIO setup will be explained more in later section.

1-hw_setup

STM32CubeMx: Install STM32 Expansion Pack v1.7.0

In this example, STM32CubeMX v6.13 was used. To verify your version, go to Help > About. If your version is older than v6.13, select Check for Updates and proceed to update STM32CubeMX.

The expansion pack comprises embedded software packages that complement STM32Cube MCU packages with supplementary software components offered by Infineon. To begin, open STM32CubeMx and select Install/Remove within the section labeled as Manage Software Installation.

2-mx-main

Select the option “ From Local “ and then find the “ v1.7.0 pack file “. After locating it, ensure that you check the box for it and continue with the installation of the package.

3-mx-software-package-manager

Close STM32CubeMx.

Build wifi_bt_tester application

Open project in STM32CubeMX

The .ioc file serves as a storage solution for initialization settings, enabling the customization of parameters and the generation of C code. After installing the expansion pack in the previous step, sample applications are created within the repository folder. It is recommended to copy a demo application into your personal directory while keeping the repository intact. This way, you can refer back to the original applications if needed.

To begin, please copy the wifi_bt_tester folder from the following location:

C:\Users\%USERNAME%\STM32Cube\Repository\Packs\Infineon\AIROC-Wi-Fi-Bluetooth-
STM32\1.7.0\Projects\STM32U575I-EV\Applications

C:\Users\%USERNAME%\STM32Cube\Examples.

Open the file wifi_bt_tester.ioc using a text editor and locate the line that specifies the STM32U5 firmware version. By default, the older version, v1.2.0, is set, and it needs to be updated.

Original:

ProjectManager.FirmwarePackage=STM32Cube FW_U5 V1.2.0

New:
```
ProjectManager.FirmwarePackage=STM32Cube FW_U5 V1.7.0
```
After making the change, save the file and then open wifi_bt_tester.ioc in STM32CubeMX by double-clicking it.

Next, navigate to Pinout & Configuration , and click on Software Packs > Select Components.

4-pinout-config

In this example, we will not be utilizing Bluetooth. Please navigate to Infineon AIROC-Wi-Fi-Bluetooth-STM32 > Wireless Connectivity > Bluetooth, and disable both btstack and btstack-integration.

Next, under Infineon AIROC-Wi-Fi-Bluetooth-STM32 > Wireless Connectivity > Platform, select CYW55500 as the device and SONA-IF513 as the module.

5-wireless-config

Generate Code.

6-generate-code

Open Project.

7-open-project

Build project in STM32CubeIDE

Edit files in STM32CubeIDE

Ensure that your project is open in STM32CubeIDE. To begin, please delete bt_cfg.c and bt_utility located under Middlewares > Connectivity > Wireless > MfgTools > command-console.

8-delete-files

Comment out the bt_utility_init() in Application > User > Core > console_task.c - line# 230.

cy_rslt_t command_console_add_command(void)
{}
(...)

/* Initialize Bluetooth utility and add BT commands */
//bt_utility_init();

9-comment-out

Apply wifi_utility_12172024.patch that modifies \Middlewares\Connectivity\Wireless\MfgTools\command- console\wifi_utility.c.

Apply a patch

Right-click on the project → Team → Apply Patch.
Under Patch Input Specification, select File and browse to wifi_utility_12172024.patch. Click Next.
Choose Apply the patch to the selected file, folder, or project, and select: \Middlewares\Connectivity\Wireless\MfgTools\command-console\wifi_utility.c, and click Next.
Set Ignore leading path name segments to 8. Click Finish to apply the patch.

Modify build settings

To add a build macro, please follow these steps:

Right-click on wifi_bt_tester in the Project Explorer and select Properties.
Navigate to C/C++ Build > Settings , then go to MCU GCC Compiler > Preprocessor under the Tool Settings.
Click the + button to include the macro “BLHS_SUPPORT”.
Apply the changes and close the window.

10-BLHS_SUPPORT

Remove “libbstack.a” in C/C++ Build > Settings > MCU G++ Linker > Libraries

11-libbstack.a

Set GPIO to control WL_REG_ON

As previously outlined in the HW setup, pin #1 on the CN8 connector should be configured to control the WL_REG_ON function. In this demonstration, the CYBSP_WIFI_WL_REG_ON will be linked to PA4.

To make this adjustment, navigate to the file explorer and locate the file at …\wifi_bt_tester\Core\Inc\cybsp.h. Once found, edit line #77 as follows:

#define CYBSP_WIFI_WL_REG_ON      PB4

Change it to:

#define CYBSP_WIFI_WL_REG_ON      PA4

To compile the source code, navigate to the menu and select Project > Build All.

12-build

Flash application in STM32CubeIDE

Right-click on wifi_bt_tester in the Project Explorer, then select Run As > 1 STM32 C/C++ Application.

13-flash

In the “Edit Configuration” pop-up, make sure to select Debug/wifi_bt_tester.elf before clicking OK.

14-run-config

Run application

Start by launching Teraterm (or your preferred terminal emulator) with the appropriate port settings.

15-teraterm-config

The Wi-Fi radio should initialize smoothly, and you can access the list of available commands by typing help.

16-init-help

To begin, use the wifi_scan command to search for available Wi-Fi networks. Once you identify a network, connect to it using the wifi_join command. Pay attention to how the ping speed varies before and after enabling TWT (Target Wake Time).

Noticed that ping latency increased after enabling TWT. This is expected, as Target Wake Time (TWT) schedules specific wake periods for the device to save power, which can introduce additional delay for packets like ICMP (ping) that may arrive while the device is in a sleep state.

17-wifi-commands

You can capture an RF trace that displays information similar to the following. The first Action packet (packet #69) originates from IF513, requesting TWT from the AP, while the second Action packet (packet #73) serves to accept that request.

Example RF trace: TWT success - wlan.addr==E8_CB_F5_40_02_D8.pcapng

18-rftrace