PSOC6 Serial Wire Viewer

Hi, I am searching for information on how to get printf working over the SWD port.

I have a miniprog3 connected and I would like a terminal on my computer where I can see debug messages.

Does anyone have some code to set this up? (I guess more is needed than selecting "SWD+SWV" in Programming/Debugging)

Also what is the best way to watch the output? Is it getting a J-link, looking in the Output tab of PSOC Creator, or something else?

So far I have borrowed this together off the internet,

best regards

Anders

/*********************************************************************

*

*       Defines for Cortex-M debug unit

*/

#define ITM_STIM_U32 (*(volatile unsigned int*)0xE0000000)    // Stimulus Port Register word access

#define ITM_STIM_U8  (*(volatile         char*)0xE0000000)    // Stimulus Port Register byte access

#define ITM_ENA      (*(volatile unsigned int*)0xE0000E00)    // Trace Enable Ports Register

#define ITM_TCR      (*(volatile unsigned int*)0xE0000E80)    // Trace control register

/*********************************************************************

*

*       SWO_PrintChar()

*

* Function description

*   Checks if SWO is set up. If it is not, return,

*    to avoid program hangs if no debugger is connected.

*   If it is set up, print a character to the ITM_STIM register

*    in order to provide data for SWO.

* Parameters

*   c:    The Chacracter to be printed.

* Notes

*   Additional checks for device specific registers can be added.

*/

void SWO_PrintChar(char c) {

  //

  // Check if ITM_TCR.ITMENA is set

  //

  if ((ITM_TCR & 1) == 0) {

    return;

  }

  //

  // Check if stimulus port is enabled

  //

  if ((ITM_ENA & 1) == 0) {

    return;

  }

  //

  // Wait until STIMx is ready,

  // then send data

  //

  while ((ITM_STIM_U8 & 1) == 0);

  ITM_STIM_U8 = c;

}

int _write(int file, char *ptr, int len)

{

    int i;

    for (i = 0; i < len; i++)

    {

        SWO_PrintChar(*ptr++);

    }

    return len;

}