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Error when programming a custom board using nRF52-DK

Dear colleagues,

I am trying to erase / program the custom board ( with nRF52832 SoC installed) using nRF52-DK. The setup looks like that:

nRF52-DK Custom / External Board

VDD ------+-------------> VDD

VTG ----+/

GND ------------------------> GND

GND DETECT -----/

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

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

image description

As the picture shows, the custom board nRF52-DK is powered from USB, and the custom board is powered from the nRF52-DK. The voltage on VDD (P20), VTG (P20), and external board is 2.86V. The voltage on SWDCLC and SWDIO (P20) is 2.63V.

When I try to use nRFGO, the program just reloads whenever I click on motherboard's name. When I try to use nrfjprog, it shows the following error in log file:

image description

When I try to connect using JLinkExe, it shows the error:

image description

The schematic of the custom board is represented on the picture bellow: image description

I will appreciate any help!

P.S. programming the nRF52-DK (without custom board) works just fine.

UPDATE: when I power the custom board from the external power supply:

  1. custom board and DK not connected:
  • voltage at DK: VDD - 2.88V, VTG - 0, SWDIO-2.65V, SWDCLC-2.65V
  • voltage at custom board: VDD - 3.26V, SWDIO-3.21V, SWDCLC-0V
  1. custom board and DK are connected

nRF52-DK Custom / External Board

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

GND ------------------------> GND

GND DETECT -----/

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

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

image description

  • VTG - 3.26V, SWDIO: 3.30V, SWDCLC - 0.52V on both
  • if I disconnect SWDCLCs, when SWDCLC at DK is 3.56V, at custom board - 0V
  • if I disconnect SWDIOS, when SWDIO at DK is 3.56V, at custom board - 3.21V

The setup was tested with another nRF52-DK and it also did not work, so DK is not the problem.

The closer photo of how the chip is mounted is attached: DSC00364.png

Parents
  • Hi, it's not really visible from your photo but I guess you have VTG and GND DETECT PINs wrongly connected on nRF52 DK P20 header. VTG must be linked to 3V3 (ideally by short to some VDD PIN on nRF52 because you are powering everything through it) and GND DETECT should be grounded (again ideally to some GND PIN on nRF52). See scheme in this Q&A and alternatively other Q&As like this one when debugging flashing through P19 and P20 of nRF5x DK boards.

  • We already did it on Windows machine but also did not have luck with it :( Today I will try to power the custom board with 12V and see if it will help

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