7

Firmware upgrade

Bluetooth is a consolidated and well known standard, anyhow interoperability issues may arise whenever a new

version of an operating system (Android, Windows, Linux, iOS, etc.) appear on the market. Bug fixes and new

features may also become available.

The SPBT3.0DP2 Data Package firmware has been designed to be upgradable via UART interface.

It is recommended to support the firmware update procedure in order to always get the benefit of latest firmware

versions.

ST may update the FW provided with the modules at any time. ST recommends that users regularly check for

documentation.

The SPBT3.0DP2 module leverages the STM32 built-in bootloader to load the new firmware. It is a three-step

procedure:

1.

Enter bootloader mode

2.

Transfer the new firmware

3.

Exit bootloader mode

7.1

Enter bootloader mode

To enter the Bootloader mode:

1.

Set the BOOT pin to HIGH level

2.

Reset the module:

a.

Set the RESET pin to HIGH

b.

Pause

c.

Set the RESET pin to LOW

7.2

Transfer the new firmware

The specification of the protocol used in the STM32 bootloader to download the new firmware is described in the

document:

http://www.st.com/web/en/resource/technical/document/application_note/CD00264342.pdf

A reference implementation of the STM32 bootloader protocol can be found at the following link:

http://sourceforge.net/projects/stm32flash/

The STM32 Flash loader demonstrator, a Windows GUI that implement that protocol can be downloaded at the

following link:

http://www.st.com/web/en/catalog/tools/PF257525

7.3

Exit bootloader mode

To exit Bootloader mode:

1.

Set the BOOT pin to LOW

2.

Reset the module:

a.

Set the RESET pin to HIGH

b.

Pause

c.

Set the RESET pin to LOW

SPBT3.0DP2

Firmware upgrade

DS11599 - Rev 7

page 20/31