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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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  • 0

    To address some of this items listed above.

    1. A target board running at 3.0vdc will program fine. (The Beacon Reference design for example runs on a button cell)
    2. The Unit will flash without the High speed crystal operating.
    3. The CL value can calculated : (CL*2)-4 (for the nRF51) The 4 is the stray capacitance in pf on the pins from the ESD protection and wire bonding. Pick the nearest standard value cap. CL=8pf then load cap SB 12pf (each side!)
    4. The high speed crystal clock comes on when needed.
    5. Rev 2 and Rev 3 silicon have pull ups and pull downs on the SWD lines. No external ones are needed but will not hamper it from working either.
    6. Pin 1 on P19 is not a voltage source, it is a reference input to the Segger part telling it that there is something connected and correct Vcc..
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  • 0

    To address some of this items listed above.

    1. A target board running at 3.0vdc will program fine. (The Beacon Reference design for example runs on a button cell)
    2. The Unit will flash without the High speed crystal operating.
    3. The CL value can calculated : (CL*2)-4 (for the nRF51) The 4 is the stray capacitance in pf on the pins from the ESD protection and wire bonding. Pick the nearest standard value cap. CL=8pf then load cap SB 12pf (each side!)
    4. The high speed crystal clock comes on when needed.
    5. Rev 2 and Rev 3 silicon have pull ups and pull downs on the SWD lines. No external ones are needed but will not hamper it from working either.
    6. Pin 1 on P19 is not a voltage source, it is a reference input to the Segger part telling it that there is something connected and correct Vcc..
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