External programming Using nRF52-DK

RE: External programming Using nRF52-DK

user78382 — Thu, 02 Apr 2020 15:11:43 GMT

user6490 can you tell, how to check if the external board is programmed correctly. Because I am using this wiring setup, and compilation and flashing is working, but when I think only the dev board is being flashed. Also can you give example how to power the external board from the nrf52840 dev board. Thanks in advance

RE: External programming Using nRF52-DK

user77380 — Mon, 11 Nov 2019 21:06:33 GMT

The schematic provide by Remi without GND DETECT work fine,Thanks.

I am using a switch to power VTG from Vdd. When VTG is disconnect, I can program the nrf52 main board. When VTG is connect, I can program the external board. This is very useful when programming a transmitter / receiver application.

RE: External programming Using nRF52-DK

user17778 — Mon, 20 Aug 2018 13:16:51 GMT

Hi,

Can I use this setup to program nrf51822

RE: External programming Using nRF52-DK

user17044 — Tue, 10 Jan 2017 16:50:22 GMT

GND DETECT is not necessary.

RE: External programming Using nRF52-DK

user15250 — Sun, 09 Oct 2016 11:47:09 GMT

I believe the issue OP may of been having was that he's using pin 1 instead of pin 2 for VDD. This is my current setup and it's working well for programming an UNPOWERED external board.

nRF52-DK           Custom / External Board


VDD ------+-------------> VDD
         /
VTG ----+

GND ------------+-------> GND
               /
GND DETECT ---+

SWD IO -----------------> SWD IO

SWD CLK ----------------> SWD CLK

RE: External programming Using nRF52-DK

Petter Myhre — Mon, 03 Oct 2016 10:59:58 GMT

@Remi Isn't this explained in "More info here" in Wojtek's answer?

RE: External programming Using nRF52-DK

user15250 — Sun, 02 Oct 2016 17:46:13 GMT

This question is still outstanding. Can someone please answer. From what I gather it should be possible using the P20 pins. Can someone please please please provide a wiring diagram for connecting P20 to SWIO, SWDLK, VDD & GND on an external board. Also explain what we are supposed to do when our external boards are powered by a 3V battery. Do we take the battery out and power it from nRF52-DK?? Asking simply because I don't have the correct connector for P19 :)

RE: External programming Using nRF52-DK

user3788 — Tue, 24 May 2016 11:45:57 GMT

It is possible. I am using P19 on nRF52-DK, and i just connect 4 lines from it: VCC(pin1), SWDIO(pin2), GND(pin3), SWDCLK(pin4 and wire them to corresponding pins on nRF51 chip. I am programming/debugging without problems that way.

External (nRF51) chip has to be powered to be detected by programmer that way (if not, nRF52-DK onboard nrf52832 will be detected only).

More info here