nRF52820 secure bootloader uart

RE: nRF52820 secure bootloader uart

JoEi — Thu, 27 Jan 2022 15:41:51 GMT

Hi Vidar,

as expected the app timer wasn't needed.
After removing it, everything worked fine.

Best regards,
Johannes

RE: nRF52820 secure bootloader uart

JoEi — Wed, 19 Jan 2022 13:49:55 GMT

Hi Vidar,

thanks, that would be awesome. =)
I'll try it and let you know if it worked.

Best regards,
Johannes

RE: nRF52820 secure bootloader uart

Vidar Berg — Wed, 19 Jan 2022 13:46:01 GMT

Hi Johannes,

Yes I think so. Our example does not rely on the app timer library at least. You can of course make sure yours doesn't either by searching through it and see if any of the app timer functions are being used or not.

Best regards,

Vidar

RE: nRF52820 secure bootloader uart

JoEi — Wed, 19 Jan 2022 13:42:47 GMT

Hi Vidar,

thanks for the fast response.
A colleague of mine ported the bootloader and it works for our nRF52840 devices.

I just had a quick look through the new pca10056_uart example and I've noticed that it doesn't use the app_timer.
Just a quick thought of mine but could it be enough to just remove the app_timer from the bootloader?

Best regards,
Johannes

RE: nRF52820 secure bootloader uart

Vidar Berg — Wed, 19 Jan 2022 13:14:56 GMT

Hi Johannes,

Maybe this is what you did already, but I generally find that it's easier to start with the project from the most recent SDK, then integrate the necessary modifications from your previous version, rather than trying to port a whole project from one SDK to another.

One approach could be to start with the 'pca10100e_usb' project and replace the USB transport with UART using 'pca10056_uart' as a reference.

Best regards,

Vidar

RE: nRF52820 secure bootloader uart

JoEi — Wed, 19 Jan 2022 12:45:10 GMT

Hi Vidar,

we use a bootloader that is based on the pca10056 examples, since we already use this one for other devices that use the nRF52840.

FYI: This bootloader was originally written with the SDK14.2.0 but has been ported to the SDK17.1.0

Best regards,
Johannes

RE: nRF52820 secure bootloader uart

Vidar Berg — Wed, 19 Jan 2022 12:11:35 GMT

Hello,

It's not possible to share the same RTC instance between these two implementations. That's why we only use the "dfu timers" in our example (lower memory footprint). Did you use one of the PCA10100E projects as a starting point?

Best regards,

Vidar