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
https://img2024.cnblogs.com/blog/1379107/202507/1379107-20250727163744772-535118714.png
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
/*******************
*
* Copyright 1998-2017 IAR Systems AB.
*
* This is a template implementation of the "__write" function used by
* the standard library.Replace it with a system-specific
* implementation.
*
* The "__write" function should output "size" number of bytes from
* "buffer" in some application-specific way.It should return the
* number of characters written, or _LLIO_ERROR on failure.
*
* If "buffer" is zero then __write should perform flushing of
* internal buffers, if any.In this case "handle" can be -1 to
* indicate that all handles should be flushed.
*
* The template implementation below assumes that the application
* provides the function "MyLowLevelPutchar".It should return the
* character written, or -1 on failure.
*
********************/
#include <LowLevelIOInterface.h>
#pragma module_name = "?__write"
int MyLowLevelPutchar(int x)
{
comSendChar(COM1, x);
return x;
}
/*
* If the __write implementation uses internal buffering, uncomment
* the following line to ensure that we are called with "buffer" as 0
* (i.e. flush) when the application terminates.
*/
size_t __write(int handle, const unsigned char * buffer, size_t size)
{
/* Remove the #if #endif pair to enable the implementation */
#if 1
size_t nChars = 0;
if (buffer == 0)
{
/*
* This means that we should flush internal buffers.Since we
* don't we just return.(Remember, "handle" == -1 means that all
* handles should be flushed.)
*/
return 0;
}
/* This template only writes to "standard out" and "standard err",
* for all other file handles it returns failure. */
if (handle != _LLIO_STDOUT && handle != _LLIO_STDERR)
{
return _LLIO_ERROR;
}
for (/* Empty */; size != 0; --size)
{
if (MyLowLevelPutchar(*buffer++) < 0)
{
return _LLIO_ERROR;
}
++nChars;
}
return nChars;
#else
/* Always return error code when implementation is disabled. */
return _LLIO_ERROR;
#endif
}
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