收到了STM32L073RZ_NUCLEO板子，想使用printf 通过SWO输出打印，参考的方法是
http://www.keil.com/support/man/docs/jlink/jlink_trace_itm_viewer.htm



Debug (printf) Viewer

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The Debug (printf) Viewer window displays data streams that are transmitted sequentially through the ITM Stimulus Port 0. Enable ITM Stimulus Port 0.

To use the Debug (printf) Viewer for tracing:

•   Add ITM Port register definitions to your source code.     #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
•   Add an fputc function to your source code that writes to  the ITM Port 0 register. The fputc function enables   printf to output messages.     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);}
•   Add your debugging trace messages to your source code using     printf.     printf("AD value = 0x%04X\r\n", AD_value);
•   Set the ITM Port 0 to capture the information. Clear the   Port 7..0 privilege bit to access ITM Port 0 from User mode.     
  
•   Open the View - Serial Windows - Debug (printf) Viewer  window.
  

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请问下 各位高手是否有遇到类似的情况

F0 L0系列的没有SWO引脚，所以估计不支持

可以尝试一下降低Core Clock

STM3240G-EVAL评估板提示"Trace HW not present"的解决方法

yklstudent-1794 发表于 2016-4-9 21:17
F0 L0系列的没有SWO引脚，所以估计不支持

看了下 L073的芯片datasheet 是没有发现此管脚，被原理图上的 PB3（SWO）给误导了下

z00 发表于 2016-4-12 22:07
可以尝试一下降低Core Clock

STM3240G-EVAL评估板提示"Trace HW not present"的解决方法 ...

3Q 以后在其他支出SWO的芯片上 在测试下