BM71 Static Configuration (UI Configuration Tool)

Last modified by Microchip on 2023/11/10 11:11


BM71 static device configuration settings are stored in separate non-volatile storage in the module. When the device powers up or resets, these settings are read into the device.

Configuration settings can change the behavior of the device, for example:

  • Advertising
  • Scanning
  • Connection intervals
  • General Purpose Input/Output (GPIO) functions, etc.

This page provides a brief introduction to the User Interface (UI) Configuration Tool, a Windows® PC-based utility used to edit a configuration text file, then program the settings into the configuration memory of the device.

It's also possible to update static configuration settings in-circuit via the host MCU.

Dynamic module configuration is achieved via specially formatted command/response packets exchanged over the Universal Asynchronous Receiver Transmitter (UART) interface.

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Reference Materials

This lab requires a BM71 PICtail with version 1.06 of the firmware. Visit the "BM71 Firmware Upgrade" page to learn how to verify/update module firmware.

Be sure to install the MCP2200 USB drivers before starting. Also, download and extract the UI Tool to your PC using the link above.

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Connection Diagram

Connection Diagram

The UART RX and TX lines are used to communicate between the host MCU and the BM70.

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Connect to BM71

Connect the BM71 PICtail board to your PC via the USB connector (bottom-side of the board) using the supplied USB Cable. Ensure the jumpers J3, JP8, and J1 (all yellow in this photo) are set as shown:

BM71 PICtail board connected to PC via the USB connector (bottom-side of the board)

COM Port

Open the Device Manager window by going to the Start Menu > Control Panel > Hardware and Sound and then selecting Device Manager. Once open, check which COM Port has been assigned to the BM71 PICtail. In this case, it is COM18. Please note that yours will probably be different.

Device Manager showing which COM Port has been assigned to the BM71 PICtail

Place the module in Test mode by setting SW7 in the ON position, then press SW5 (reset) to reset the module.

BM71 module in Test mode by setting SW7 in the ON position, then press SW5 (reset)

The module's basic operating mode (Test/Application) is sampled and established on a module reset condition. We recommend pressing the Reset (SW5) push button whenever SW7 is first changed, or when you want to be sure that SW7 is sampled and applied by the module.

With jumper JP8 shorted, LED0 will be lit (BLUE) indicating the module is in Test mode, as shown in the accompanying image.

Launch the User Interface Configuration Tool

After extracting the files from the UI Configuration Tool ZIP file, double click on the application file called IS187x_102_BLEDK3_UI v100.132.exe to launch the utility.

Immediately after launch, the Start Menu window will pop up. Before we can do anything with this tool, we must load a UI parameter table. One way to load the UI parameters is by using an existing UI text file.

Click on Load in the Start Menu window.

UI Config Tool:  Click on Load in the Start Menu window

Load Text File

Selecting Load Text File will open up another window. Choose the IS1871SF_102_BLEDK3_UI v100.132(BM71) default text file and click Open.

Select Load Text File. Choose the IS1871SF_102_BLEDK3_UI v100.132(BM71) default text file and click Open

Edit Text File

Once the text file has been loaded, the edit button will be enabled. Click on Edit.

Edit Text File Button

When you press the edit button to start editing UI parameters, the Main Feature window will pop up. This window is where the user will select the target application. BLEDK3 supports all Bluetooth® Low Energy (BLE) operations, while the Beacon mode is used for non-connectable advertising only. If BeaconThings is selected, the module will support both BLEDK and Beacon operations.

For this demo, we will only select BLEDK 0x01: BM71 and then click OK.

Select BLEDK 0x01: BM71 and then click OK Button

System Setup Window

Immediately after we click OK, we will see the Function Settings window pop up. It is in this window that most module parameters can be configured. As we can see, there are a few different tabs, each with different settings we can change. The first tab, System Setup, is where we find all the system configurations. We can change our device’s name, change the UART’s settings, select between Manual and Auto Pattern modes, change security settings, etc.

System Setup Window

In the second tab, System Setup2, we find the GPIO Configuration table as well as more system configuration settings. The I/O pins on the BM71 can be configured as either a control or an indication signal. The GPIO Configuration table shown on the System Setup2 tab provides configurable I/O pin assignment details for the control and indication signals of the BM71 BLEDK3 application.

Second tab, System Setup2, GPIO Configuration table

Feel free to browse the tabs and explore the different settings that can be configured to best fit your application. Below is a brief explanation of the rest of the tabs.

  • LE mode Setup: This tab contains the LE mode settings.
  • Generic Attribute Profile (GATT) Service Table: In this tab, the user can build their own GATT service table.
  • LED Setup: This tab is the P0_2/LED0 configuration page. This is a fixed-function status output in BLEDK3, and it indicates what state the module is currently in via the LED Flash pattern.
  • Beacon Setup: This tab contains all the iBeacon configurations.

Device Name

Usually, the first setting customers choose to change is the Name Fragment under the Device Information section of the System Setup tab. This allows you to easily identify your device on a smartphone during general discovery. In this case, we chose to name the module "DeveloperHelp".

Name Fragment under the Device Information section of the System Setup tab

The Name Fragment identifier becomes the module's Generic Access Profile (GAP) Service Device Name characteristic.


Another important setting on this tool is the UART RX_IND. To reduce current consumption, BLEDK3 will automatically enter Low-Power mode if UART RX_IND is enabled and the UART_RX_IND pin is assigned. When in the normal power mode of operation, the module runs a 16 MHz clock; in Low-Power mode, the module runs a 32 kHz clock. The Low-Power operation mode also disables the module UART section and thus the host MCU has no way to communicate with the module. If the host MCU needs to send/receive data/commands to the module, then the only way to do it is to pull the UART_RX_IND pin low. By default, the UART_RX_IND pin is enabled, but for this lab, we will disable it, therefore preventing the module from entering Low-Power mode.

UART RX IND Disable Selection

If you are using the Manual Pattern Tool with the BM-71-PICTail board, we recommend disabling the UART_RX_IND function, so that the utility can communicate with the module. In your final application, we recommend enabling this function to facilitate lower power consumption.

Operation Pattern

Using this UI Tool you can also select whether the BM71 will operate in Auto Pattern mode or Manual Pattern mode. Refer to the "BM71 Operating Modes" page to learn more about Auto and Manual Pattern modes.

Auto Pattern mode or Manual Pattern mode selection

Go ahead and select the mode you wish to use.

Save Settings

After we have made all the desired changes, we need to write these new configuration settings into our module. Click on Finish.

Finish Button Selection

After that window closes, select Save on the Start Menu to save the configuration settings to a text file on your computer. You will now have a starting point for further editing of your static parameters.

Save on the Start Menu

Write Settings

Next, select Write on the Start Menu to write the settings to the module.

Select Write on the Start Menu

On the window that opens, select the correct COM port that has been assigned to your BM71 PICtail, and for Baudrate select 115200. Then click on the Write button.

Write button selection


You will see a window asking if you are sure you want to write to the EFLASH, select Yes.

Yes Button Selection

Lastly, you will see a window letting you know the write has been successful. Click on OK.

OK Button Selection

You can now close the Start Menu window.

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The settings have now been saved to separate non-volatile storage. Next time the device powers up or resets, these settings will be read into the device.

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