Updating firmware with dfu bootloader

[Geoffroy]

Hi,

i would like to program my module nRF52840 via uart.

I generated private then public key using nrfutil.exe tool

i could programm softdevice and bootloader and flash them on my nRF52840.

I use : https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v11.0.0%2Fbledfu_example_serial.html

now i want to update firmware, first i'm testing an existing package : softdevice_s140.zip (nRF5_SDK_15.0.0_a53641a\examples\dfu\secure_dfu_test_images\uart\nrf52840)

so i try to execute this cmd : 

D:\Work\nRF5_SDK_15.0.0 ble_telechargement_uart\examples\dfu\secure_dfu_test_images>nrfutil.exe dfu serial --package softdevice_s140.zip --port 4 -fc 1 : here is the result : 

D:\Work\nRF5_SDK_15.0.0 ble_telechargement_uart\examples\dfu\secure_dfu_test_images>nrfutil.exe dfu serial --package softdevice_s140.zip --port 4 -fc 1
  [------------------------------------]    0%
Traceback (most recent call last):
  File "nordicsemi\__main__.py", line 987, in <module>
  File "site-packages\click\core.py", line 722, in __call__
  File "site-packages\click\core.py", line 697, in main
  File "site-packages\click\core.py", line 1066, in invoke
  File "site-packages\click\core.py", line 1066, in invoke
  File "site-packages\click\core.py", line 895, in invoke
  File "site-packages\click\core.py", line 535, in invoke
  File "nordicsemi\__main__.py", line 745, in serial
  File "nordicsemi\__main__.py", line 680, in do_serial
  File "nordicsemi\dfu\dfu.py", line 121, in dfu_send_images
  File "nordicsemi\dfu\dfu.py", line 90, in _dfu_send_image
  File "nordicsemi\dfu\dfu_transport_serial.py", line 200, in open
pc_ble_driver_py.exceptions.NordicSemiException: Serial port could not be opened on {0}. Reason: could not open port '4': WindowsError(2, 'Le fichier sp\xe9cifi\xe9 est introuvable.')
Failed to execute script __main__

on windows device manager , i have  : Jlink CDC UART Port (COM4) and USB Serial Port (COM5), i also tryed with com 5.

what is th correct arg pls ?

[Marjeris Romero]

Hi,

The right documentation page for SDK 15.0.0 will be this one: https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v15.0.0%2Fsdk_app_serial_dfu_bootloader.html&cp=5_5_1_4_3_4

If you are testing using one of the provided packages you need to use the default public key included in the bootloader project, do not use your own generated public key. Because these test packages have been generated using a private key that corresponds to the default public key included the project.

Also make sure the device has enter DFU mode (indicated by LED 3 being lit) before starting the DFU process.

Best regards,

Marjeris

[Geoffroy]

Oh ok thank you very much Marjeris for all those informations !

I'm goiing to restart all process before asking for more details !

[Geoffroy]

ok thanks to you i could program with examples provided !

it's a beginning, i try now to program my own program

[Marjeris Romero]

Happy to help!

Now for your own program you need to create your own private and public keys as you did before and create your own firmware zip package with your own application.

This blog is written for an older version of the SDK, but explains very well the steps to do to this, see: https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/getting-started-with-nordics-secure-dfu-bootloader

And more documentation for nrfutil can also be found in the nrfutil github page readme: https://github.com/NordicSemiconductor/pc-nrfutil

Best regards,

Marjeris

[Geoffroy]

Yes, i already looked posts that you mentionned.

I already generated keys.

I succeeded to program my own program with uart.

I must check all is fine.

Next step will be to program nRF52840 from another microcontroler via uart...

[Marjeris Romero]

Hi,

Good to hear you are making progress. To program a nRF52840 from another microcontroller via UART you need to make your own DFU master for the other microcontroller (while the nRF52840 will be your DFU target).

You can have a look at the sequence chart here, to see the opcodes and message sequence that need to be sent from the DFU master/controller.

It's also suggested that you get hold of a sniffer trace when you use the DFU app on the phone or PC to perform a DFU update. You can use this sniffer trace as the reference to create your own DFU master.

Take also a look at Appendix 1.5 in Hung's blogpost. He includes an example code for a very simple UART DFU master for nRF you can use as a reference.

Best regards,

Marjeris.

[Geoffroy]

can you give me a link to Appendix 1.5 in Hung's blogpost ?

i don' know this blogspot

[Marjeris Romero]

Hi yes, it's the same blogpost I linked to earlier: https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/getting-started-with-nordics-secure-dfu-bootloader

[Geoffroy]

ok thank you, I'll try to use this code...

[Geoffroy]

in my zip, i have a manifest.json, nrf52840.dat and nrf52840.bin

In DFU_SPI_readme.docx (from appendix 1.5), init.dat is mentionned, is it my file named nrf52840.dat (i don't have any file init.dat in my zip)

[Marjeris Romero]

Sorry for the late answer. Yes, nrf52840.dat is the init.dat file. If you open manifest.json you will see which file correspond to bin and dat file.