单片机解密工作环境说明:

1.硬件平台: DX开发板主板 + DX103核心板

2.硬件平台: Eclipse IDE for C/C++ Developers + GNU Tools ARM Embedded
  (1) IDE:    Eclipse IDE for C/C++ Developers
  (2) 编译器: GNU Tools ARM Embedded编译器，支持STM32F407最新的HAL驱动库


用Eclipse IDE for C/C++ Developers新建一个C工程模板，主函数代码如下：

//
// This file is part of the GNU ARM Eclipse distribution.
// Copyright (c) 2014 Liviu Ionescu.
//

// ----------------------------------------------------------------------------

#include ＜stdio.h>
#include "diag/Trace.h"

#include "Timer.h"
#include "BlinkLed.h"

// ----------------------------------------------------------------------------
//
// STM32F4 led blink sample (trace via ITM).
//
// In debug configurations, demonstrate how to print a greeting message
// on the trace device. In release configurations the message is
// simply discarded.
//
// To demonstrate POSIX retargetting, reroute the STDOUT a.n.d STDERR to the
// trace device a.n.d display messages on both of them.
//
// Then demonstrates how to blink a led with 1Hz, using a
// continuous loop a.n.d SysTick delays.
//
// On DEBUG, the uptime in seconds is also displayed on the trace device.
//
// Trace support is enabled by adding the TRACE macro definition.
// By default the trace messages are forwarded to the ITM output,
// but can be rerouted to any device o.r completely suppressed, by
// changing the definitions required in system/src/diag/trace_impl.c
// (currently OS_USE_TRACE_ITM, OS_USE_TRACE_SEMIHOSTING_DEBUG/_STDOUT).
//