记录个IAR程序下载后硬件复位不运行，必须断电复位才运行的问题

【问题测试】
有个F407的跑马灯的例子，是MDK和IAR两个版本，MDK版本的例子下载并复位后可以正常看到LED闪烁，而IAR的例子下进去后，不会闪烁。
使用TOOL的上位机内核寄存器监测工具测试发现，硬件复位后竟然还在调试状态，邪门了

必须断电复位，断电复位后正常了：

或者LUA命令控制退出调试状态

【问题解决】

起初以为是启动代码里面封装的函数__iar_program_start造成，将其注释掉，直接跳转到mian也不行

最后测试发现是半主模式配置问题，之前测试的8.50版本是半主模式配置 + fputc重新写，实际测试不会再执行半主操作了

进入IAR9,X后，这种配置不行了，必执行半主操作，导致运行起来了，还处于调试模式状态。使用9.X要关闭半主，并且重新定向串口

1. /*******************
2. *
3. * Copyright 1998-2017 IAR Systems AB.
4. *
5. * This is a template implementation of the "__write" function used by
6. * the standard library.  Replace it with a system-specific
7. * implementation.
8. *
9. * The "__write" function should output "size" number of bytes from
10. * "buffer" in some application-specific way.  It should return the
11. * number of characters written, or _LLIO_ERROR on failure.
12. *
13. * If "buffer" is zero then __write should perform flushing of
14. * internal buffers, if any.  In this case "handle" can be -1 to
15. * indicate that all handles should be flushed.
16. *
17. * The template implementation below assumes that the application
18. * provides the function "MyLowLevelPutchar".  It should return the
19. * character written, or -1 on failure.
20. *
21. ********************/
23. #include <LowLevelIOInterface.h>
25. #pragma module_name = "?__write"
27. int MyLowLevelPutchar(int x)
28. {
29.   comSendChar(COM1, x);
30.    
31.   return x;
32.   
33. }
35. /*
36. * If the __write implementation uses internal buffering, uncomment
37. * the following line to ensure that we are called with "buffer" as 0
38. * (i.e. flush) when the application terminates.
39. */
41. size_t __write(int handle, const unsigned char * buffer, size_t size)
42. {
43.   /* Remove the #if #endif pair to enable the implementation */
44. #if 1
46.   size_t nChars = 0;
48.   if (buffer == 0)
49.   {
50.     /*
51.      * This means that we should flush internal buffers.  Since we
52.      * don't we just return.  (Remember, "handle" == -1 means that all
53.      * handles should be flushed.)
54.      */
55.     return 0;
56.   }
58.   /* This template only writes to "standard out" and "standard err",
59.    * for all other file handles it returns failure. */
60.   if (handle != _LLIO_STDOUT && handle != _LLIO_STDERR)
61.   {
62.     return _LLIO_ERROR;
63.   }
65.   for (/* Empty */; size != 0; --size)
66.   {
67.     if (MyLowLevelPutchar(*buffer++) < 0)
68.     {
69.       return _LLIO_ERROR;
70.     }
72.     ++nChars;
73.   }
75.   return nChars;
77. #else
79.   /* Always return error code when implementation is disabled. */
80.   return _LLIO_ERROR;
82. #endif
84. }

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