请教关于STM32的STLINK进行SWD的printf输出设置

wjl13580445117 · 发表于 2020-2-4 11:51:45

我的环境：keil_v5
stm32f103c8t6

想用ITM调试，穷尽网上的各种方法，还是不能在DEBUG VIEWER中显示出来，我不知道是不是STLINK的原因，大家有没有遇过，
stlinkv2的SWIM接开发板的13口TDO,KEIL中也做了设置
#include <stdio.h>

#define ITM_Port8(n) (*((volatile unsigned char *)(0xE0000000+4*n)))
#define ITM_Port16(n) (*((volatile unsigned short*)(0xE0000000+4*n)))
#define ITM_Port32(n) (*((volatile unsigned long *)(0xE0000000+4*n)))
#define DEMCR          (*((volatile unsigned long *)(0xE000EDFC)))
#define TRCENA       0x01000000

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

int fputc(int ch, FILE *f)
{
if (DEMCR & TRCENA)
{
      while (ITM_Port32(0) == 0);
      ITM_Port8(0) = ch;
}
return(ch);
}