MDK下仿真实现printf功能

1.MDK工程设置如下

stm32dbg,ini文件内容：

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


/* STM32DBG.INI: STM32 Debugger Initialization File */


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


// <<< Use Configuration Wizard in Context Menu >>> // 


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


/* This file is part of the uVision/ARM development tools. */


/* Copyright (c) 2005-2007 Keil Software. All rights reserved. */


/* This software may only be used under the terms of a valid, current, */


/* end user licence from KEIL for a compatible version of KEIL software */


/* development tools. Nothing else gives you the right to use this software. */


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


FUNC void DebugSetup (void) {


// Debug MCU Configuration


// DBG_SLEEP Debug Sleep Mode


// DBG_STOP Debug Stop Mode


// DBG_STANDBY Debug Standby Mode


// TRACE_IOEN Trace I/O Enable 


// TRACE_MODE Trace Mode


// <0=> Asynchronous


// <1=> Synchronous: TRACEDATA Size 1


// <2=> Synchronous: TRACEDATA Size 2


// <3=> Synchronous: TRACEDATA Size 4


// DBG_IWDG_STOP Independant Watchdog Stopped when Core is halted


// DBG_WWDG_STOP Window Watchdog Stopped when Core is halted


// DBG_TIM1_STOP Timer 1 Stopped when Core is halted


// DBG_TIM2_STOP Timer 2 Stopped when Core is halted


// DBG_TIM3_STOP Timer 3 Stopped when Core is halted


// DBG_TIM4_STOP Timer 4 Stopped when Core is halted


// DBG_CAN_STOP CAN Stopped when Core is halted


//


_WDWORD(0xE0042004, 0x00000027); // DBGMCU_CR


_WDWORD(0xE000ED08, 0x20000000); // Setup Vector Table Offset Register


}


DebugSetup(); // Debugger Setup

3.项目工程加载retarget.c或者debugprint.c，其中retarget.c内容如下

1. #include
   
2. 
   
3. #include "stm32f10x.h"
   
4. 
   
5. #pragma import(__use_no_semihosting_swi)
   
6. 
   
7. struct __FILE { int handle; /* Add whatever you need here */ };
   
8. 
   
9.     FILE __stdout;
   
10. 
    
11.     FILE __stdin;
    
12. 
    
13. int fputc(int ch, FILE *f) 
    
14. 
    
15. {
    
16. 
    
17.     return ITM_SendChar(ch);
    
18. 
    
19. }
    
20. 
    
21. volatile int32_t ITM_RxBuffer;
    
22. 
    
23. int fgetc(FILE *f)
    
24. 
    
25. {
    
26. 
    
27.   while (ITM_CheckChar() != 1) __NOP();
    
28. 
    
29.   return (ITM_ReceiveChar());
    
30. 
    
31. }
    
32. 
    
33. int ferror(FILE *f)
    
34. 
    
35. {
    
36. 
    
37.     /* Your implementation of ferror */
    
38. 
    
39.     return EOF;
    
40. 
    
41. }
    
42. 
    
43. void _ttywrch(int c)
    
44. 
    
45. {
    
46. 
    
47.     fputc(c, 0);
    
48. 
    
49. }
    
50. 
    
51. int __backspace()
    
52. 
    
53. {
    
54. 
    
55.     return 0;
    
56. 
    
57. }
    
58. 
    
59. void _sys_exit(int return_code)
    
60. 
    
61. {
    
62. 
    
63. label:
    
64. 
    
65.     goto label; /* endless loop */
    
66. 
    
67. }

debugprint.c内容如下：

1. #include
   
2. 
   
3. #define ITM_Port8(n) (*((volatile unsigned char *)(0xE0000000+4*n)))
   
4. 
   
5. #define ITM_Port16(n) (*((volatile unsigned short*)(0xE0000000+4*n)))
   
6. 
   
7. #define ITM_Port32(n) (*((volatile unsigned long *)(0xE0000000+4*n)))
   
8. 
   
9. #define DEMCR (*((volatile unsigned long *)(0xE000EDFC)))
   
10. 
    
11. #define TRCENA 0x01000000
    
12. 
    
13. struct __FILE { int handle; /* Add whatever you need here */ };
    
14. 
    
15.     FILE __stdout;
    
16. 
    
17.     FILE __stdin;
    
18. 
    
19. int fputc(int ch, FILE *f) 
    
20. 
    
21. {
    
22. 
    
23.     if (DEMCR & TRCENA) 
    
24. 
    
25.     {
    
26. 
    
27.         while (ITM_Port32(0) == 0);
    
28. 
    
29.         ITM_Port8(0) = ch;
    
30. 
    
31.     }
    
32. 
    
33.     return(ch);
    
34. 
    
35. }

4.包含头文件#include ,并调用printf

5在debug中打开输出仿真：View-serial-debug(printf)