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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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    Hmm. Figuring out the correct value for the load caps turns out to be harder than it should be. I looked at the white paper entitled "Crystal Oscillator Design Considerations" and the calculations it suggest are simple enough. However, it contains the following sentence:

    When buying crystals you can usually choose from a range of capacitive loads (ex: 8-20pF). When ordering a crystal you must choose a CL (ex: 12 pF) that is within the range of the CL specified for the nRF device. The CL range that nRF devices can operate in is only limited by the maximum CL (ex: CL < 16 pF). This maximum CL depends on the on-chip crystal oscillator design and is specified in the device data sheet.

    I can't find a data sheet listed here.

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  • 0

    Hmm. Figuring out the correct value for the load caps turns out to be harder than it should be. I looked at the white paper entitled "Crystal Oscillator Design Considerations" and the calculations it suggest are simple enough. However, it contains the following sentence:

    When buying crystals you can usually choose from a range of capacitive loads (ex: 8-20pF). When ordering a crystal you must choose a CL (ex: 12 pF) that is within the range of the CL specified for the nRF device. The CL range that nRF devices can operate in is only limited by the maximum CL (ex: CL < 16 pF). This maximum CL depends on the on-chip crystal oscillator design and is specified in the device data sheet.

    I can't find a data sheet listed here.

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