Custom DFU imlementation

RE: Custom DFU imlementation

Menon — Mon, 31 Mar 2025 13:19:08 GMT

Hello,

Glad to hear that your issue has been resolved.

Kind Regards,

Abhijith

RE: Custom DFU imlementation

KentOverton — Mon, 31 Mar 2025 11:25:35 GMT

I removed the three lines in prj.conf that enabled DFU vie Bluetoot (using Android NRF CONNECT).

The update now works, I can download a new app_update.bin, reboot, see that the new app_update.bin is running, reboot again and see that it's the same new firmware.

Note that I don't have to do a b oot_write_img_confired().

I'm not sure why this worked - it woud be convienient to be able to use both the Bluetooth DFU update and my custom dfu_update.

RE: Custom DFU imlementation

KentOverton — Fri, 28 Mar 2025 11:01:55 GMT

Abhijith

I'm not sure how to use the 'Insert Tab' to paste a log

I've copied the build log to my google drive at

https://drive.google.com/file/d/1lNcQtgqpXq1MvOrlFGtU_-Y1Mu6NSRTr/view?usp=sharing

I've copied my prj.conf to my googled drive at

https://drive.google.com/file/d/1og7hsGK8A5sq-NTyEQYt3sUoY5zYObPK/view?usp=sharing

I have no mcuboot.conf

Kent

RE: Custom DFU imlementation

Menon — Thu, 27 Mar 2025 18:32:14 GMT

Hello,

Could you share the complete build log, prj.conf, and mcuboot.conf files here? Please use the Insert tab to paste the full log.

Kind regards,
Abhijith

RE: Custom DFU imlementation

KentOverton — Tue, 25 Mar 2025 18:39:36 GMT

They are already enabled.

RE: Custom DFU imlementation

Menon — Tue, 25 Mar 2025 17:02:24 GMT

Hello,

Try enabling the CONFIG_MCUBOOT_IMG_MANAGER and this will select the BOOTUTIL_LIB.

CONFIG_FLASH_MAP=y
CONFIG_MCUBOOT_IMG_MANAGER=y

Kind Regards,

Abhijith

RE: Custom DFU imlementation

KentOverton — Mon, 24 Mar 2025 23:00:51 GMT

I tried it. My main()starts

err=boot_write_img_confirmed();
sprintf(buff,"Err=%d",err);

Err is a 0 - but the device reverted to the previosus version on the next boot.

Are tjhere reuired CONFIG.... lines in prj.conf?

RE: Custom DFU imlementation

Menon — Mon, 24 Mar 2025 15:48:44 GMT

Hello,

You can make use of the function boot_write_image_confirmed, which marks the currently running firmware image as confirmed and prevents MCUboot from reverting to an older image at the next reset. Take a look at MCUboot image control APIs.

Kind Regards,
Abhijith

RE: Custom DFU imlementation

KentOverton — Sun, 23 Mar 2025 17:17:18 GMT

Menon,

Sorry to be such a bother - burt I still have an issue.

My DFU logic woeks perfectly. I can download an update, load it inti the secondary slot and when I reboot the new firmware runs.

When I reboot a second time the firmware reverts to the old version.

I am sure that the mechanism is fully documented documented - but I have spent more than a little time serchig for a clear description of how to confirm the download.

We are akready using FOTA over BLE, using an Android phone and nRF Connect

I want to do the equivalent of TEST and CONFIRM in nRF Connect.

If you could point me at an example - or documentation - of how to implement this I would greatly appreciate it.

RE: Custom DFU imlementation

Menon — Tue, 18 Mar 2025 16:56:56 GMT

Hello,

Good to hear that you were able to make the DFU work.

This makes sense because if you look at dfu_target_mcuboot_init(), you can see that if no buffer is assigned using dfu_target_mcuboot_set_buf(), the initialization will fail, and the error message you are seeing is generated from here.

I think the appropriate buffer size depends on the flash page size. Since you are working with the nRF52840, I recommend at least 4096 bytes (or try 8192 bytes).

Kind regards,
Abhijith

RE: Custom DFU imlementation

KentOverton — Mon, 17 Mar 2025 14:00:38 GMT

I've done some more research and testing.

After looking at aother post here I added

buffer4[1024] to line 44 of dfutest.c, giving

uint8_t buffer[1200],buffer2[1200],buffer3[100],buffer4[1024];

I added

i=dfu_target_mcuboot_set_buf(buffer4,sizeof(buffer4)); at line 140 of dfutest.c.

dfu_target_init(...) now returns 0.

After just a little bit of playing around my firmwar now does the complete DFU update.

Could you please

1. tell me why this worked

2. tell me an appropriate size for the buffer in

dfu_target_mcuboot_set_buf

RE: Custom DFU imlementation

KentOverton — Sun, 16 Mar 2025 22:32:49 GMT

It.s a NRF52840-CKAA-R7.

I'm developing under 2.6.0.

It's a Custom Configuration - I've attached a version of my firmware to this note. You will see boards directory in the project.

devzone.nordicsemi.com/.../DFUTEST_5F00_NORDIC.zip

I've modified my project, - isolating the failing code in src/dfutest.c

In my production code there's a lot of stuff surrounding this code, A connection is made to my AWS server, a firmwaere download is requeted, the firmare downloads blocks of code from the server and processes these blocks.

dfutest.c has an image of the first block of code I get from the server.

main.c loops at the very top, continuously running the test.

RE: Custom DFU imlementation

Menon — Fri, 14 Mar 2025 15:17:02 GMT

Hello,

Which Nordic chip or DK are you using here? What build configuration did you use for building the application?

Inside the pm_static file, mcuboot_primary seems to overlap with mcuboot_pad. Try shifting mcuboot_primary to avoid potential conflicts.

Kind regards,
Abhijith