BM70 Firmware Update

 Objective

This lab takes you step-by-step through the process of updating the firmware on the BM70 module. New firmware can add Bluetooth® Low Energy (BLE) specific functionality for new revisions of the Bluetooth specification as well as provide a way to fix bugs discovered in the current device Bluetooth operation.

​

Contact your local Microchip Sales office to obtain BM70 firmware package updates.

 Materials

Hardware Tools

Software Tools

 Connection Diagram

Lab1_Connection_Diagram.png

The Universal Asynchronous Receiver Transmitter (UART) RX and TX lines are used to communicate between the Host MCU and the BM70.

 Procedure

​

Be sure to install the MCP2200 USB drivers before starting. Also, extract the BM70 Firmware Package files to your computer.

The first thing we will do is check which firmware version we currently have on the module.

1

Connect the BM70 PICtail to your PC. Ensure the jumpers are set as shown.

Connected.png

a

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 BM70 PICtail. In this case, it is COM18. Please note that yours will probably be different.

DeviceManager.png

b

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

BM70Update.png
​

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 above.

c

Launch the ISupdate Programming Utility and select the correct COM port (from substep a). Set baudrate to 115200 and memory type/subtype to Flash/Embedded. Then click Connect.

isupdate.png

If the connection was successful you will see the following message:

ConnectionSuccess.png

2

Verify the current firmware version.

To find the currently installed version, under the Flash/EEPRom/MCU/AHB Accesss pane, enter "100e" in the Address field and "2" in the Length(Hex) field. Then, click Read.

ReadVersion.png

In this case, we can see that version 1.03 is installed.

VersionRead.png

3

Update the firmware.

Click on the Browse button and navigate to the folder where you extracted the BM70 Firmware Package earlier. Select all the needed HEX files in the dialog box and click Open.

Update.png

a

Click the Update button.

Update2.png

b

After a few seconds, the update will be complete and you will see a screen like the one below.

Updated.png

 Results

You can verify that you have the new firmware version by clicking Read under the Flash/EEPRom/MCU/AHB Access pane again.

FinalResult.png

Lastly, you can click Disconnect and close the ISupdate tool.

  Return to Top

© 2024 Microchip Technology, Inc.
Notice: ARM and Cortex are the registered trademarks of ARM Limited in the EU and other countries.
Information contained on this site regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights.