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Segger Debug Out on DK can't see my target

Bret Foreman

I just got a new target board back from fab/assembly and I'm trying to use the debug out connector on the PCA10028 to program the new target.

My target is the NRF51822-CFAC-R

I've wired J19 on the DK as follows:

Pin 1 - tied to the same 3V supply that powers the DK and my target
Pin 2 - SWDIO (pin H2) on my target
Pin 3 - GND on my target
Pin 4 - SWDCLK (pin C8) on my target

In nRFgo Studio, I'm able to see the Segger on the DK but the Segger is not able to see my target device. Is there any additional setup I need to do on the DK in order to download to my device?

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    It looks as though the 16MHz crystal is not starting. I'm not sure if that will prevent the JTAG from working but this thread seems to indicate so. I used 12pF caps on the crystal, copied from the reference design. But I see the values are rather critical as specified in section 3.6.1 of the Product Specification. I'll do some measurements and calculations and see if changing the caps will get the crystal to start. Does anyone know if that would prevent the JTAG from working?

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    It looks as though the 16MHz crystal is not starting. I'm not sure if that will prevent the JTAG from working but this thread seems to indicate so. I used 12pF caps on the crystal, copied from the reference design. But I see the values are rather critical as specified in section 3.6.1 of the Product Specification. I'll do some measurements and calculations and see if changing the caps will get the crystal to start. Does anyone know if that would prevent the JTAG from working?

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