Using JLinkExe to flash nRF52

[Jacob]

Hello, Our production systems run on Raspberry Pi, which is running on ARM. Currently the nRF5x command line tools are only available on x86, which means that we need to use JLinkExe directly.

We want to flash SoftDevice, bootloader and application. Things doesn't seem to work out - I have never seen the application load, for instance (I guess some pointer needs to be set up so that the bootloader is aware of the application). RTT logging output is very spotty, I sometimes see the bootloader initialize itself but after toggling the power I never get any logs again.

Is there a complete example (SD+bootloader+application) available somewhere where a nRF52 device is flashed using JLinkExe?

Thanks, Jacob

[Håkon Alseth]

You can use the "loadfile" command in JLinkExe for this after selecting your device. There's a shell script available for nrf51 that needs tweaking to work for nrf52, but it gives you most of the commands needed: github.com/.../nrfjprog.sh

[Jacob]

Thanks, I have something that starts the bootloader now. What memory area/register do I need to write to inform the bootloader about that there is a valid application in the application space? The system currently stops in the bootloader.

A side note: The SDK documentation mentions that the bootloader address must be specified in UICR.BOOTLOADERADDR. However, most of the UICR registers aren't defined in the nRF52 PS PDF.

[sdpan]

+1 ... @Håkon Alseth can you please help provide the info (addresses) needed to program the device via JLinkExe? nrf52 or nrf52840 (or any specific chip) Thank you!