how to debug my board through nRF52 DK?

[kfcube]

I have a nRF52 DK. I'd like to debug my board which has nRF51822 and sensors, and has SWCLK, SWDIO, VCC, GND, RX, TX, VCC, GND. Please provide detail steps on how to wire, and how to connect. I am a beginner here.

Thanks a lot,

[Vidar Berg]

Hi,

You can use one of the Debug output headers and make the following connections to your target (easiest from P20 if you have Arduino type jumper cables and connectors): 1. GND <--> GND, 2. SWCLK <<->SWCLK,  3. SWDIO <--> SWDIO,  4. VDD <--> VCC (supply target with voltage from DK to ensure same voltage level).  5. VDD <-->VTG

[kfcube]

Thanks. What's the 5th (VDD <->VTG) for? I don't have the VTG on my board.