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getting mass storage example to work using J-link

omid aramoon

HI

I am completely new to keil MCB 4300 !!

im trying to run the USB Host Mass Storage example using j link . but nothing is shown in my debug(printf) viewer !! i tried couple of solutions like this link :

www.keil.com/.../jlink_trace_itm_viewer.htm

but i get the error that says : stdin stdout multiply defined .........

can anyone help me please ?

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  • 0

    You need a #pragma to stop in including library stuff in the linker,

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

/* Implementation of putchar (also used by printf function to output data)    */
int SendChar(int ch)                    /* Write character to Serial Port     */
{
        ITM_SendChar(ch); // From core_cm4.c

  return(ch);
}

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

#include <rt_misc.h>

#pragma import(__use_no_semihosting_swi)

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

int fputc (int ch, FILE *f) { return (SendChar(ch)); }

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

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

void _sys_exit (int return_code) { for (;;); }

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

    You'll need to #include <stdio.h> and make sure you have the trace clock matching the system clock. There are other retargeting examples, you might want to check those and the documentation.

Reply
  • 0

    You need a #pragma to stop in including library stuff in the linker,

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

/* Implementation of putchar (also used by printf function to output data)    */
int SendChar(int ch)                    /* Write character to Serial Port     */
{
        ITM_SendChar(ch); // From core_cm4.c

  return(ch);
}

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

#include <rt_misc.h>

#pragma import(__use_no_semihosting_swi)

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

int fputc (int ch, FILE *f) { return (SendChar(ch)); }

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

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

void _sys_exit (int return_code) { for (;;); }

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

    You'll need to #include <stdio.h> and make sure you have the trace clock matching the system clock. There are other retargeting examples, you might want to check those and the documentation.

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