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Debug is getting stuck at "BKPT 0XAB"

Hi. I'm a newbie coding for an STM32F4 Discovery board. I'm working with some modified sample code and when I try to debug it, I'm getting stuck at "BKPT 0XAB", and I can't progress any further.

Can someone help me understand what causes this and how I can fix it?

Parents

0 Westonsupermare Pier over 10 years ago in reply to J Stevens

Ok, but just be clear you shouldn't be #include'ing .C files, this will charge the ownership to the file doing the #include, you simply add the .C file to the project.

If you don't want to add files to the project, you'd paste something like this directly into the primary source file.

//******************************************************************************
// Hosting of stdio functionality through ITM/SWV
//******************************************************************************

#include <stdio.h>
#include <rt_misc.h>

#pragma import(__use_no_semihosting_swi)

struct __FILE { int handle; /* Add whatever you need here */ };
FILE __stdout;
FILE __stdin;

int fputc(int ch, FILE *f)
{
  ITM_SendChar(ch);

  return(ch);
}

int fgetc(FILE *f)
{
  char ch = 0;

  return((int)ch);
}

int ferror(FILE *f)
{
  /* Your implementation of ferror */
  return EOF;
}

void _ttywrch(int ch)
{
  ITM_SendChar(ch);
}

void _sys_exit(int return_code)
{
label:  goto label;  /* endless loop */
}

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

When using SWV via the trace set up you must set the frequency of the processor correctly for the data to show up in the Serial Debug (printf) tab.

Reply

0 Westonsupermare Pier over 10 years ago in reply to J Stevens

Ok, but just be clear you shouldn't be #include'ing .C files, this will charge the ownership to the file doing the #include, you simply add the .C file to the project.

If you don't want to add files to the project, you'd paste something like this directly into the primary source file.

//******************************************************************************
// Hosting of stdio functionality through ITM/SWV
//******************************************************************************

#include <stdio.h>
#include <rt_misc.h>

#pragma import(__use_no_semihosting_swi)

struct __FILE { int handle; /* Add whatever you need here */ };
FILE __stdout;
FILE __stdin;

int fputc(int ch, FILE *f)
{
  ITM_SendChar(ch);

  return(ch);
}

int fgetc(FILE *f)
{
  char ch = 0;

  return((int)ch);
}

int ferror(FILE *f)
{
  /* Your implementation of ferror */
  return EOF;
}

void _ttywrch(int ch)
{
  ITM_SendChar(ch);
}

void _sys_exit(int return_code)
{
label:  goto label;  /* endless loop */
}

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

When using SWV via the trace set up you must set the frequency of the processor correctly for the data to show up in the Serial Debug (printf) tab.

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