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Instead of continuously checking for various events from the main() function, the code must register its tasks and BLE event handlers via the STM32 API and then let the scheduler handle them by calling SCH_Run() from main().

The task mechanism is used by the STM32WB samples to minimize the power consumption.

If you look up the references to shci_user_evt_proc(), you will see that it’s registered as a task by calling SCH_RegTask(): Instead, it was invoked via a function pointer from SCH_Run().

If you track the call stack down to main(), you will notice that shci_user_evt_proc() was not called explicitly.

Once the breakpoint triggers, observe the call stack:.

The go to the HRS_Init() function, set a breakpoint there and reset your device:.

First of all, find the aci_gatt_add_char() function and use CodeJumps to locate other functions calling it:

#Gbu421 bluetooth peripheral device driver

Now we will look through the STM32WB driver code to see the functions involved in managing the services and characteristics.

The Bluetooth LE explorer will begin receiving measurements from the device and displaying them in the “Read Value” field:

Click on the Heart Rate Measurement characteristic and enable the “Notify” switch.

Note the Heart Rate service with characteristics matching the list above: Bluetooth LE Explorer will show a list of the services and characteristics exposed by the device. Start scanning and wait for the app to discover the HRSTM peripheral:

#Gbu421 bluetooth peripheral device install

Install Bluetooth LE explorer on your computer (alternatively, see below for instructions for Raspberry Pi) and launch it. We will now use the Bluetooth LE Explorer app to locate the Heart Rate Service and its main characteristics in the output from our STM32WB project. Heart Rate Control Point (BLE characteristic, see this document for the description).Body sensor location (BLE characteristic, see this document for a list of values).Client Characteristic Configuration Descriptor (a.k.a.Heart Rate Measurement (BLE characteristic, see this document for the output value format).Heart Rate Service (BLE Service, see this document for the layout).Specifically the most important components for the Heart Rate Service are shown below: The layout of services, characteristics and descriptors for common service types (such as Heart Rate Service) is documented on the Bluetooth SIG website. Each characteristic may define additional descriptors used to control it. Each service defines one or more characteristics. peripheral) can define one or more services. The Bluetooth Low Energy devices output data in a structured way.Once the project is built, program the regular Bluetooth LE wireless stack into your device using the Wireless Stack Updater tool: Then connect the board via the ST-Link connector and press F5 to start debugging:.Press “Finish” to create the project, then build it via Build->Build Solution:.If you are not sure, follow our basic STM32WB tutorial to get started: On the last page of the wizard select the debug settings that match your configuration.

On the next page select “Heart Rate Service Demo” sample and proceed with the default configuration for Bluetooth LE services:.

In this tutorial we will use the STM32WB-Nucleo board that features an STM32WB55RGV6 device:

On the next page select your STM32WB device.

Hence, please ensure you use the MSBuild subsystem instead.

On the first page of the wizard select “ Create a new project -> Embedded Binary -> MSBuild“: Note that due to the excessive amounts of the include directories used by the STM32WB SDK, the GNU Make will not be able to build most STM32WB projects correctly.

Specify your project name and location and then press “Create” to launch the VisualGDB’s wizard:.

Open Visual Studio and launch the VisualGDB Embedded Project Wizard:.

We will create a basic Heart Rate Service peripheral (emulating a heart rate measurement device) and will show the Bluetooth LE services, characteristics and descriptors involved in getting a reading from that device and the STM32 functions used to control them.īefore you begin, ensure you have the STM32WB-Nucleo kit (including the Nucleo board and the USB dongle) and install VisualGDB 5.4R10 or later.

#Gbu421 bluetooth peripheral device how to

This tutorial shows how to create a basic Bluetooth LE Peripheral using the STM32WB-Nucleo board.