Program custom board with nrf52832

[Stas]

Hello! I know there're a lot of questions about program custom board. I try to programm my board used onboard j-link (p19 socket) I can't pass the first step - can't force j-link to detect external chip. It's all the time programm internal chip. The power supply for my board I take from P20 connector (VDD NRF - 2.85V. I used external - result the same) and general for PCA100400 - GND. What I do: Custom PCA100400 VDD VDD NRF (P20 connector - 1 pin = 2.85v) GND GND of PCA100400 board SWDIO P19 - 2 pin (EXT SWDIO) SWDCLK P19 - 4 pin (EXT SWDCLK) VDD P19 - 1 pin (EXT VTG) GND P19 - 9 pin (EXT_GND_DETECT)

try to programm the simplest blinky app

[Stas]

I solved problem using p20 connector instead of p19 thanking for Endnode's answer in this post: devzone.nordicsemi.com/.../

[endnode]

I do use P19 as well but only if I have full JTAG/SWD 10-pin connector on the other side and all lines are connected properly so SEGGER J-Link OB detects it and flashes external target not internal nRF5x chip on the DK. If I'm not sure that P19 detection works for particular custom board I switch to P20 where I can "force" detection by shorting two PINs...