设置芯片时钟

//=====================================================================
//TITLE:
// 设置芯片时钟
//AUTHOR:
// norains
//DATE:
// Friday 8-October-2010
//Environment:
// KEIL MDK 4.0
// .NET Micro Framework Porting 4.1
// RedCow Board
//=====================================================================

叶帆在《【.Net Micro Framework PortingKit - 06】设置芯片时钟》（http://blog.csdn.net/yefanqiu/archive/2010/01/03/5125786.aspx）一文已经有对芯片设置的详细方式，只不过没有用上ST给的Library库，觉得使用上有点不方便。所以，本文以另一种方式，直接调用ST的STM32F10x_StdPeriph_Driver代码，以达到设置芯片时钟的目的。

1.依次建立如下文件夹：./Solutions/STM32F103ZE_RedCow/DeviceCode/Drivers/Stubs/Processor/stubs_bootstrap。

2.将./DeviceCode/Drivers/Stubs/Processor/stubs_bootstrap的所有文件拷贝到./Solutions/STM32F103ZE_RedCow/DeviceCode/Drivers/Stubs/Processor/stubs_bootstrap文件夹中。

3. 打开./Solutions/STM32F103ZE_RedCow/DeviceCode/Drivers/Stubs/Processor/stubs_bootstrap/dotNetMF.proj文件，并进行修改。

原语句：
<ProjectPath>$(SPOCLIENT)/DeviceCode/drivers/stubs/processor/stubs_bootstrap/dotNetMF.proj</ProjectPath>

更改为：
<ProjectPath>$(SPOCLIENT)/Solutions/STM32F103ZE_RedCow/DeviceCode/Drivers/Stubs/Processor/stubs_bootstrap/dotNetMF.proj</ProjectPath>

原语句：
<Directory>DeviceCode/Drivers/Stubs/Processor/stubs_bootstrap</Directory>

更改为：
<Directory>Solutions/STM32F103ZE_RedCow/DeviceCode/Drivers/Stubs/Processor/stubs_bootstrap</Directory>

然后在</Project>之前增加如下内容：
<ItemGroup>
<DriverLibs Include="STM32F10x_StdPeriph_Driver.$(LIB_EXT)" />
<RequiredProjects Include="$(SPOCLIENT)/Solutions/STM32F103ZE_RedCow/DeviceCode/Libraries/Libraries.proj" />
</ItemGroup>
<ItemGroup>
<IncludePaths Include="Solutions/STM32F103ZE_RedCow/DeviceCode/Libraries/Configure" />
<IncludePaths Include="Solutions/STM32F103ZE_RedCow/DeviceCode/Libraries/STM32F10x_StdPeriph_Driver/inc" />
<IncludePaths Include="Solutions/STM32F103ZE_RedCow/DeviceCode/Libraries/CMSIS/Core/CM3/" />
</ItemGroup>

4.接下来就是修改C++代码了，在这里需要对时钟进行初始化。打开./ Solutions/STM32F103ZE_RedCow/DeviceCode/Drivers/Stubs/Processor/stubs_bootstrap/ stubs_functions_bootstrap.cpp文件，输入如下内容：

 #include "stm32f10x_conf.h"

void BootstrapCode()
{
 SystemInit();
}

5.打开./Solutions/STM32F103ZE_RedCow/NativeSample/NativeSample.proj文件，对依赖的stubs_bootstrap工程需要进行相应的更改。

原语句：
Include="$(SPOCLIENT)/DeviceCode/drivers/stubs/processor/stubs_bootstrap/dotNetMF.proj" />

更改为：
<RequiredProjects Include="$(SPOCLIENT)/Solutions/STM32F103ZE_RedCow/DeviceCode/Drivers/Stubs/Processor/stubs_bootstrap/dotNetMF.proj" />

6.对NativeSample进行重新编译，如果没有错误，那将编译好的程序下载到开发板中，会发现LED的闪烁会明显加快，也就意味着大功告成。