Posted on May 17, 2011 at 14:14I’m looking for a small example on how to printf over the SWO to the Keil IDE, I can do it by RS323 to a terminal, but how do I point it to the SWO instead of the UART, can someone please provide me with a small example or a link to where I can read about it. Thanks
Replace the semi-hosting routines, specifically the fputc() and _ttywrch() with routines that access the M3's debug channel.
Something along the following lines, using the core_cm3 CMSIS Core Support package.
#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) {
return (ITM_SendChar((uint32_t)ch));
}
int fgetc(FILE *f) {
return ((int)ITM_ReceiveChar());
}
int ferror(FILE *f) {
/* Your implementation of ferror */
return EOF;
}
void _ttywrch(int ch) {
ITM_SendChar((uint32_t)ch);
}
void _sys_exit(int return_code) {
label: goto label; /* endless loop */
}
