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Problem programming and debugging after using SWD and CLK ports as GPIO MKE02Z64

Question asked by on May 18, 2015
Latest reply on Apr 20, 2016 by Gaston Schelotto

Hi all,


we are facing problem as in subject, about Sharing SWD debug ports with GPIO features.


Is it possible to use the programming / debugging ports SWD_DIO and SWD_CLK as general purpose I/O on MKE02Z64VLH4 controller?

Following datasheet, I set up SIM_SOPT register, putting SWDE = 0.

After this I set GPIO register for using SWD_DIO/PTA4 as output port, and SWD_CLK/PTC4 as input port. Both ports have pull-up disabled. Here is portion of code (some of it is "copied" from Processor Expert generation):


/* SIM_SOPT: SWDE=0 */

SIM_SOPT = (uint32_t)((SIM_SOPT & (uint32_t)~(uint32_t)(



// setting SWD as GPIO ports configuration

// PTA4 = Output, Pull up disabled, PTC4 = Input Pull up disabled


PORT_PUEL = (uint32_t)((PORT_PUEL & (uint32_t)~(uint32_t)(

                      PORT_PUEL_PTCPE4_MASK |



GPIOA_PSOR &= (uint32_t)~(uint32_t)(0x00000010);

// PTA4 = 0

GPIOA_PCOR |= (uint32_t)(0x00000010);


// PTC4 input. PTA4 output

GPIOA_PDDR = (uint32_t)((GPIOA_PDDR & (uint32_t)~(uint32_t)(


                           )) | (uint32_t)(



// Enable port input of PTA4 and PTC4

GPIOA_PIDR = (uint32_t)((GPIOA_PIDR & (uint32_t)~(uint32_t)(




.....................          // do some stuff


// Reset ports to the start-up default settings



// Restore SWD debug functionality

/* SIM_SOPT: SWDE=1 */

SIM_SOPT = (uint32_t)((SIM_SOPT | (uint32_t)(




The result is that after some programmings, using PE Micro U-MULTILINK with SWD connection, che controller become non-programmable anymore.

Programming procedure's log reports the error "Memory secured" (or "Memory protected", I'm sorry but I cant remeber precisly...).

So, I have a dubt: before start programming, shouldn't the MULTILINK do a controller reset and, consequently, gets control on programming lines?


Moreover and seriously bad, after some attempts, the debbuger got broken...!


I have read this post, it seems he has similar issue: Controller gets locked if SWDE pins are configured as GPIO 

But I see no solving answer...


What can be problem, is there some mistakes in the code? Can u help me?

Thanks in advance,