Update NRF52 Firmware (DFU) via External MCU STM32

[Mayur Patel]

Hi all,

I am new to NRF world & I have gone through Nordic's Tutorials about

• Getting Started
• custom Services / Characteristics
• Bootloader, Softdevices
• DFU via OTA / UART (PC)
• creating/signing DFU packet etc..

So now in my case, main (Host) CPU is the STM32 and main Programme runs on this. nRF52832 is on the same PCB as BT connectivity provider. 
I want to update the firmware of the nRF not via Standard ways like OTA but via STM32. (reason: due to complete system update in one go).

So my Que.:

1. nRF side: How this can be done on the  (while prev. firmare + softdevice is already running) via UART / SPI Bootloader?
   (Info: I know that to go again to Bootloader mode we need to impl. Buttonless DFU via PINRESET or GPREGRET register set)
   
2. Which is the best interface to connect both ? SPI or UART?
   
   
3. STM32 side: What type of implementation / Bootloader is required (with STM32 Host App Binary) so that DFU packet can be catched abd then can be send to nRF?

complete step by step explaination to acheive this will be a really helpfull for me.
(Info: I have already seen the posts of updating the STM32 via nRF but in my case its reverse.)

Dev-Setup:

• nRF52832 Evalboard (PCA10040)
• Nordic Tools (pc-nrfconnect, nrfutils, nrfconnect-App, etc...)
• STM32F10xxx

[Louis_263]

Hi,
I am currently facing the same problem and would like to update the nRF52 from a STM32 as well. Do you possibly still have the code for the STM32 and would share it?

Best regards

Louis

[Edvin]

Hello,

I am not quite sure what you mean. I don't have anything other than what I already linked in this ticket. But perhaps this question was not meant for me?

BR,

Edvin

[Louis_263]

Hi Edvin,

the question was related to the original post. I also want to update the firmware of a nRF52 with a STM32 and wanted to ask the author of the question how he solved the problem.

BR,

Louis

[JuanAlm]

Did you find finally something? Im currently with the same problem but Im using nrf connect sdk... so the project Serial DFU Host Application (By using C programming language) doesnt work for me.

[Edvin]

Hello,

This ticket was originally for the nRF5 SDK, while you seems to be using the nRF Connect SDK. So for follow up questions, please create a new DevZone ticket. 

However, we don't have any mcumgr implementation for embedded devices. So in the case if you want to update the nRF with another MCU, you need to implement mcumgr on that device, so that it can push the FW update to the nRF over the protocol that you are using.

Best regards,

Edvin