nRF52840 - Perform a firmware update via USB interface.

[marco c.]

Hi there,

we use the nRF52840 on a embedded system. The nRF52840 is connected via usb interface to the central cpu of the embedded system.
An embedded linux (buildroot) is running on the main cpu. Now we want to update the firmware of the nRF52840 via the usb interface.

As I read  here  the nRF52840 doesn't provide a bootloader in ROM that can be started by setting a "boostrap" pin before system startup like some other MCUs do.

Is that correct?

After some research the only way to update the firmware via USB seems to be to use a bootloader (e.g  one from the examples section of the SDK) that is located in flash and  to use

the nrfutil to perform the firmware update itself. Am I right or is there another way to do a firmware update especially without using the nrfutil?

Thanks for your help, Marco.

[Sigurd]

Hi,

marco c. said:

nRF52840 doesn't provide a bootloader in ROM that can be started by setting a "boostrap" pin before system startup like some other MCUs do

There are several ways to enter DFU mode, see this page. With the USB bootloader, you also have the DFU Trigger Library.

marco c. said:

Am I right or is there another way to do a firmware update especially without using the nrfutil?

Correct, see this and this post.

[marco c.]

Thanks for the detailed information. These helped me a lot.

First I decided to use nrfutil and I managed to install the tool  on my system and this works for me.

Thanks a lot for the help.