creating bootloader for sensor tile

[Dilbert K]

Posted on September 29, 2017 at 21:33

I am using the ST SensorTile for development.  Now trying to understand the OTA and Bootloader.

Currently only able to find the binary for bootloader.

Does ST provide source code / project to build our own bootloader ?

As I would like to add the DFU into bootloader support.

[Nesrine M_O]

Posted on October 02, 2017 at 09:57

Hi

K.Dilbert

,

The embedded bootloader code is located in the system memory. It is programmed by ST during production. For full information, refer to the application note (

http://www.st.com/content/ccc/resource/technical/document/application_note/b9/9b/16/3a/12/1e/40/0c/CD001675pdf/files/CD001675pdf/jcr:content/translations/en.CD001675pdf

) STM32 microcontroller system memory boot mode.

-Nesrine-

[Dilbert K]

Posted on October 09, 2017 at 21:54

Hi Nesrine,

As I want to try out the DFU on ST SensorTile, I check the schematic again, the BOOT0 is connected to GND.

Is that meant, I would not able to test DFU for this platform ??

Regards

[Dilbert K]

Posted on October 09, 2017 at 22:48

I also got a B-L475E-IOT01A discovery board, but search the User Guide, do not find procedure how to enter DF mode.

[Girish Karnavat]

Posted on November 14, 2017 at 16:24

STM32 typically have a bootloader in system memory that can be used through various communication interfaces. In your case you are referring to the DFU USB bootloader.

See link below to the overview of which types of bootloaders are located on the STM32.

http://www.st.com/content/ccc/resource/technical/document/application_note/b9/9b/16/3a/12/1e/40/0c/CD00167594.pdf/files/CD00167594.pdf/jcr:content/translations/en.CD00167594.pdf

Here is a more in depth explanation about the USB bootloader.

http://www.st.com/content/ccc/resource/technical/document/application_note/6a/17/92/02/58/98/45/0c/CD00264379.pdf/files/CD00264379.pdf/jcr:content/translations/en.CD00264379.pdf

The sensor tile microcontroller is the STM32L476JGY. We have examples in our STM32 Cube L4 firmware library that is based on a similar microcontroller but a different package and memory size, 32L476GDISCOVERY. See link below.

http://www.st.com/content/st_com/en/products/evaluation-tools/product-evaluation-tools/mcu-eval-tools/stm32-mcu-eval-tools/stm32-mcu-discovery-kits/32l476gdiscovery.html

The example firmware code for this discovery kit for DFU USB bootloader can be found in the STM32CubeL4, 

http://www.st.com/content/st_com/en/products/embedded-software/mcus-embedded-software/stm32-embedded-software/stm32cube-embedded-software/stm32cubel4.html

If you unzip the folder structure you can find the example firmware here “\STM32Cube_FW_L4_V1.9.0\Projects\STM32L476G-Discovery\Applications\USB_Device\DFU_Standalone�