This discussion has been locked.

You can no longer post new replies to this discussion. If you have a question you can start a new discussion

What does retarget.c work?

ele over 8 years ago

Dear All,

Now I'm trying to use Hello example of cortex-m3 for study on KEIL (uVision)

I came across "retarget.c" when I was opening the project file.

Does anyone know what does regret.c work? Why do I need or use this file what for?

#include <stdio.h>

extern unsigned char UartPutc(unsigned char my_ch);

FILE __stdout;

FILE __stdin;

int fputc(int ch, FILE *f) {

return (UartPutc(ch));

}

int fgetc(FILE *f) {

return (UartPutc(UartGetc()));

}

int ferror(FILE *f) {

/* Your implementation of ferror */

return EOF;

}

void _ttywrch(int ch) {

UartPutc (ch);

}

...

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

/* Retarget functions for GNU Tools for ARM Embedded Processors */

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

#include <stdio.h>

__attribute__ ((used)) int _write (int fd, char *ptr, int len)

{

for (i=0; i<len;i++) {

UartPutc(ptr[i]); // call character output function

}