nRF52 DK not detected through USB

[emlynkz]

Hi,

after having issues with my devkit flashing the main MCU, the interface MCU isn't being seen on USB anymore.

LED5 is blinking rapidly.

 nrf52 DK keeps resecuring itself 

The board is a PCA10040 v3.0.4 with the nRF5340 as interface MCU.

All the documentation is only about the older version with the Atmel MCU, which can be recovered with its bootloader.

Is a similar thing possible with the v3.x and up?

I have access to other devkits and programmers.

Thanks!

Étienne Machabée

Lynkz Instruments Inc.

[JONATHAN LL]

Hi, 

Can you share the info that is on the sticker with us ?

And just to confirm that the nRF52 on the DK is working, can you try to use another DK or external programmer to program the "broken" DK?


Regards,
Jonathan

[emlynkz]

Hi,

yes I can flash with an external programmer the target nRF52 on the DK. It's only the J-Link portion that is not working.

The sticker says

PCA10040

3.0.4

2024.19

1050384200

Thanks,

Étienne Machabée

[JONATHAN LL]

What is the voltage on SB29 and SB36?



Regards,
Jonathan

[emlynkz]

Hi Jonathan, here are the requested voltages:

SB29 -> 3.035V

SB36 -> 3.034V

Étienne Machabée
Lynkz Instruments Inc

[JONATHAN LL]

Thanks Étienne,  I would like to have the DK sendt to us. I will arrange something with RSM to get you a replacement for you and to acquire the unit you have.  You will be contacted with further info shortly. 

[Prasad_2001]

Actually the nrf52 dk has gone into the Boot Loader Mode which leads to the blinking of LED5. It is written on the pg. No 9 of the DK's user manual the way it enters the Boot Loader mode. I am also having the same issue. And just want to know how to get out of the Bootloader Mode?

[JONATHAN LL]

 Prasad_2001 , what version of the DK are you referring to ? In the latest version of the DK v3.x.x, (link: https://docs-be.nordicsemi.com/bundle/ug_nrf52832_dk/attach/nRF52_DK_User_Guide_v3.x.x.pdf?_LANG=enus ) 

The new DK's do not work the same way the old ones did. There is a difference on hoe the interface MCU is used here. 

Ref: https://docs.nordicsemi.com/bundle/ug_nrf52832_dk/page/UG/dk/revision_history.html 

[Prasad_2001]

Oh Thanks, I was referring the old versions manual but got into the same issue. My nrf52832 DK is currently in Bootloader mode. And is not detected in laptop when I connect with cable. how should i get out of the bootloader mode?

[JONATHAN LL]

You have a newer version of the DK with the new debugger? 

If that is the case then you are not able to recover the interface MCU in the same way and if you have tried to do that then you might have broken the device if that is the case as the interface MCS does not have the same support for being re-flashed. 

You can also create a new ticket with all this info and link to this case as reference and we can follow up there. 

IF only the interface MCU is what does not behave properly then you might still be able to program the onboard nRF SoC with another Debugger\Programmer through the Debug In connector. 

Regards,
Jonathan