Debug pointer lost while SWD_IO Pin initialisation

[niket_zope]

I am working on a project on the board frdm-ke15z my problem is in my code there's a function to initialize the pins with there default values. But when I run the code in debug mode (using on-chip CMSIS Debugger)at the time when I try to initialize SWD_IO pin the debug pointer is lost.
strange part is the same code runs in debug mode perfectly when I debug using J-link.
I'm not able to understand what could be the possible problem.kerryzhou‌

[niket_zope]

Thanks for your input,

I'm new to embedded, Please forgive if any mistakes.

Yes the functionality I'm providing to the pin is SWD_IO only which is its default value.

I checked the PORTA_PCR4 (MUX) value with CMSIS Debugger its shows  MUX=7 (i.e. 111)  seems like its chip specific what is refers ? can you explain ?

[kerryzhou]

Hi Niket Zope,

  Do you run the SDK code for your  frdm-ke15z directly, which can be downloaded from this link:

   Welcome | MCUXpresso SDK Builder 

  If you still want to use the PTA4 as the SWD_DIO, you don't need to configure it.

  Could you also please share which detail code you run then you lost the CMSIS DAP debugger?

   I highly suggest you use the NXP official code to test it at first, whether you still have the issue or not.

Any updated information, just kindly let me know.

Kerry

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[kerryzhou]

Hi Niket Zope ，

  Thanks for your cooperation.

   What's the function you want to configure the SWD_DIO in the code? Not the SWD function?

  If yes, your debugger must be lost.

 If you still want to use the SWD_DIO pin function, you don't need to configure it, as the default function is the SWD function.

About the JLINK didn't lost issue, you can check PORTA_PCR4 register, what's the mux data now?

  Maybe the JLINK debugger even didn't modify the PTA4 mux function.

Wish it helps you!

If you still have questions about it, please kindly let me know.

Kerry

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