Using EFR Connect Mobile App for OTA DFU
This tutorial explains how to perform a Device Firmware Upgrade (DFU) with Bluetooth Over-The-Air (OTA) update. Any chip that has OTA-updates enabled in their GATT profile can have an OTA upgrade. Most of the example applications provided in the Bluetooth SDK already have OTA support built into the code. In these examples, the DFU mode is triggered through the Silicon Labs OTA service that is included as part of the application’s GATT database. This can be checked and added in the BLE GATT Configurator in Simplicity Studio.
For tutorial purposes, the
SOC - Empty SDK example application will be upgraded to the
SoC - Thermometer example application.
SoC - Thermometer has the Health Thermometer service for visual feedback, users can easily check that the functionality of the user application has changed.
- Wireless Starter Kit and Bluetooth-capable radio board
- Simplicity Studio
- Android or iOS mobile device
Download EFR Connect mobile app (Android / iOS).
Connect the kit to your computer and select it in Simplicity Studio.
SOC - Emptydemo from Simplicity Studio Launcher.
SoC - ThermometreSoftware Examples project.
SoC - Thermometerproject and run
create_bl_files.bat/shscript from the smart phone project tree. This creates a folder named
output_gblunder your project. There are three
.gblupgrade image files in this folder:
application.gbl: user application (including full Bluetooth stack)
apploader.gbl: AppLoader (including minimal Bluetooth stack)
full.gbl: For UART DFU, not needed in this example. Starting from SDK 2.7.0, the user application also includes the Bluetooth stack and therefore the Bluetooth stack can be updated without a full update. A full update is needed only if the AppLoader needs to be updated. See AN1086 for more details.
- Transfer the
.gblfiles to your smart phone so the mobile app can find them. You can either transfer them via USB to any folder on your phone or just place it to a cloud storage which is available from your phone (e.g. Google Drive, Dropbox, iCLoud)
Launch the EFR Connect mobile app.
In the EFR Connect mobile app
Once in the app,
Go to the
Bluetooth Browserand find and connect to your kit (default name "Empty Example").
Open the pop-up menu in the upper right corner and select
Partial OTAand look for the gbl file in your smartphone
OTAand your upgrade should start.
After the OTA process has finished, verify that the kit is now running the
SoC - Thermometer example.
You can find the kit in the
Bluetooth Browser with a new name "Thermometer Example".
To enable the Bluetooth OTA upgrade, the target device must be programmed with the Gecko Bootloader that is configured as an Internal Storage Bootloader. This is an application bootloader, which requires that the new firmware image acquisition is managed by the application.
Running the "Demos" in Simplicity Studio will include the bootloader and user application. However, flashing a "Software Example" does not. If your OTA upload stops at 0 % and you get a message on an Android phone saying "GATT CMD STARTED", that might indicate a missing or incorrect bootloader. In this case do the following:
Go to New Project -> Gecko Bootloader -> Gecko Bootloader 1.5.0 and create that for your kit. Remember to choose the "Internal Storage Bootloader" option suitable for your storage size.
.isc-file for the bootloader project, you can configure some options, but for this example, press
Generatewith the default settings.
Build the project and find the folder in your bootloader project tree that is named
“GNU ARM <compiler version number> - Default”. Flash the
.s37-file to the device. This includes the first stage and main bootloaders.
Now, proceed with flashing the
SOC - Empty-project as in First steps #3.
AN1086: Using the Gecko Bootloader with the Silicon Labs Bluetooth® Applications
UG266: Silicon Labs Gecko Bootloader User's Guide