nRF52840 custom Dongle - first programming

[Raulld]

Hello, Nordic team.

 

We replicated the nRF52840 Dongle.

The problem is that our Windows PC does not detect our custom USB PCB after pressing the reset button.

 

VDDH is 5 V, and VDD is 1.8 V (not 3 V as measured in the nRF52840 dongle).

 

Do we need a first programming process using the nRF52840 DK via (here) to get the expected programming nRF52840 Dongle behavior via USB?

 

Thank you very much!

[SwRa]

Hello,

Yes, you ae right.. The nRF52840-Dongle also doesn't have on-board debugger.. Hence it is necessary to use an external debugger to program the dongle.. You will need to use a DK or JLink to program it.

Regards,

Swathy

[Raulld]

Hello SwRa.

Thanks.

SwRa said:

You will need to use a DK or JLink to program it.

The original nRF52840 Dongle can be programmed via USB using the nRF Programmer app.

That is what we want to replicate.

Should we assume there is a problem with our PCB?

Can we discover the issue through the nRF52840 DK debugging/programming?

Thank you again!

[James168]

The 52840 dongle has a bootloader already, so it can boot in bootloader mode through USB to program it.

You can program your dongle bootloader first.

1665.pca10059_bootloader.zip

[Raulld]

Hello James168 .

 

It worked!

We verified our PCB works as expected.

 

If someone is in a similar situation, these links help use the P20 connector of the nRF52840 DK to program a custom nRF52840-based PCB:

https://devzone.nordicsemi.com/f/nordic-q-a/33741/nrf52840-preview-dk-program-custom-board-issue

https://docs.nordicsemi.com/bundle/ug_nrf52840_dk/page/UG/dk/hw_debug_out.html

https://docs.nordicsemi.com/bundle/ug_nrf52840_dk/page/UG/dk/ext_programming_support.html

Thank you very much, James168  .