nRF52840 Firmware update from stm32f407 (non-OS)

[alex kim]

Hi Everyone,

I need to develop a bootloader and a firmware update procedure.
My development environment is nRF52840, sdk 15.3.
Program download configuration 
1) Download nRF52840's firmware to stm32f407 memory from server through LTE modem.
2) RS-232C is connected between stm32f407 and nRF52840.
3) The firmware update should be performed on the nRF52840 using the nRF52840 firmware stored in the stm32f407 memory.
4) stm32f407 is non-OS.

Please advise me to develop nRF52840 Bootloader and FW Update procedure in the above environment.

Alex

[bjorn-spockeli]

HI Alex, 

I recommend that you take a look at this C port of nrfutil: https://github.com/jimmywong2003/nrf-slim-serial-uart-dfu-host-c-code

I think you should be able to run this on the STM side and then you only need to flash the Secure DFU Bootloader over Serial Link (UART/USB) example to the nRF52840 to perform firmware updates of the nRF52840 from the STM. 

Best regards

Bjørn 

[alex kim]

Thank you for your quick reply.

Alex

[bjorn-spockeli]

Happy to help

[bjorn-spockeli]

Happy to help

[alex kim]

Hi Bjorn

I have two questions

1. I added DEBUG inside the preprocessor symbol in the keil environment.

    Undefined symbol app_error_save_and_stop (referred from app_error_weak.o) was printed when I build in keil

2. Which of the following messages would appear in uart of the secure_bootloader?

  <error> app: Received an error: 0x00000004!

Best regards,

Alex