SRAM初始化和设置NVIC中断表偏移
//=====================================================================
//TITLE:
// SRAM初始化和设置NVIC中断表偏移
//AUTHOR:
// norains
//DATE:
// Friday 8-October-2010
//Environment:
// KEIL MDK 4.0
// .NET Micro Framework Porting 4.1
// RedCow Board
//=====================================================================
关于SRAM的初始化和NVIC的设置，其实在叶帆的《【.Net Micro Framework PortingKit - 05】SRAM初始化&设置NVIC中断表偏移》（http://blog.csdn.net/yefanqiu/archive/2010/01/03/5125786.aspx）已经有过详细的描述，只不过我并不太喜欢直接在微软的代码上直接修改，所以才有了本文的一系列繁琐的设置。两种方法各有利弊，大家可以随自己的喜好进行选择。另外，在此注明一下，本文所涉及到的所有代码部分，都来源于叶帆的文章。
1.在我们自己的Solution下以此路径建立一系列文件夹：./Solutions/[MySolution]/DeviceCode/Drivers/Stubs/Processor/stubs_PreStackInit
2.将./Solution /DeviceCode/Drivers/Stubs/Processor/stubs_PreStackInit/dotNetMF.proj拷贝到./Solutions/[MySolution]/DeviceCode/Drivers/Stubs/Processor/stubs_PreStackInit，将dotNetMF.proj文件中相关联地路径改为绝对路径。可能修改有点麻烦，现在将完整的内容列举如下，需要注意的是STM32F103ZE_RedCow是我的Solution名字，请各位读者根据实际情况进行改写。完整内容如下：
<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<PropertyGroup>
<AssemblyName>cpu_prestackinit_stubs</AssemblyName>
<ProjectGuid>{19b183cc-474f-47ce-a544-390acc3e2b62}</ProjectGuid>
<Size>
</Size>
<Description>Pre stack initialization stub driver</Description>
<Level>HAL</Level>
<LibraryFile>cpu_prestackinit_stubs.$(LIB_EXT)</LibraryFile>
<ProjectPath>$(SPOCLIENT)/Solutions/STM32F103ZE_RedCow/DeviceCode/Drivers/Stubs/Processor/stubs_PreStackInitdotNetMF.proj</ProjectPath>
<ManifestFile>cpu_prestackinit_stubs.$(LIB_EXT).manifest</ManifestFile>
<Groups>Processor/stubs</Groups>
<LibraryCategory>
<MFComponent xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" Name="PreStackInit_HAL" Guid="{5A9E3217-7D6D-40de-A685-28BA44D31E9A}" ProjectPath="" Conditional="" xmlns="">
<VersionDependency xmlns="http://schemas.microsoft.com/netmf/InventoryFormat.xsd">
<Major>4</Major>
<Minor>0</Minor>
<Revision>0</Revision>
<Build>0</Build>
<Extra />
<Date>2009-04-30</Date>
<Author>Microsoft</Author>
</VersionDependency>
<ComponentType xmlns="http://schemas.microsoft.com/netmf/InventoryFormat.xsd">LibraryCategory</ComponentType>
</MFComponent>
</LibraryCategory>
<Documentation>
</Documentation>
<PlatformIndependent>False</PlatformIndependent>
<CustomFilter>
</CustomFilter>
<Required>False</Required>
<IgnoreDefaultLibPath>False</IgnoreDefaultLibPath>
<IsStub>True</IsStub>
<HasLibraryCategory>True</HasLibraryCategory>
<Directory>/Solutions/STM32F103ZE_RedCow/DeviceCode/Drivers/Stubs/Processor/stubs_PreStackInit</Directory>
<PlatformIndependentBuild>false</PlatformIndependentBuild>
<Version>4.0.0.0</Version>
</PropertyGroup>
<Import Project="$(SPOCLIENT)/tools/targets/Microsoft.SPOT.System.Settings" />
<PropertyGroup>
<OutputType >Library</OutputType>
</PropertyGroup>
<ItemGroup>
<Compile Include="$(SPOCLIENT)/DeviceCode/Drivers/Stubs/Processor/stubs_PreStackInit/$(AS_SUBDIR)/PreStackInit_stub.s" />
</ItemGroup>
<ItemGroup />
<Import Project="$(SPOCLIENT)/tools/targets/Microsoft.SPOT.System.Targets" />
</Project>
3.打开NativeSample.proj文件，将依赖的工程做修改。
原语句：
<RequiredProjects Include="$(SPOCLIENT)/DeviceCode/Drivers/Stubs/Processor/stubs_PreStackInit/dotNetMF.proj" />
更改为：
<RequiredProjects Include="$(SPOCLIENT)/Solutions/STM32F103ZE_RedCow/DeviceCode/Drivers/Stubs/Processor/stubs_PreStackInit/dotNetMF.proj" />
修改完毕之后，最后调用msbuild命令来编译一次，以确定修改正确。当确定修改正确之后，我们就可以进入下一步了。
4．将./DeviceCode/Drivers/Stubs/Processor/stubs_PreStackInit/RVD_S/PreStackInit_stub.S文件拷贝到./Solutions/STM32F103ZE_RedCow/DeviceCode/Drivers/Stubs/Processor/stubs_PreStackInit/RVDS路径。然后再次用文本编辑器打开之前我们修改好的./Solutions/[MySolution]/DeviceCode/Drivers/Stubs/Processor/stubs_PreStackInit/dotNetMF.proj文件，并做如下修改。
原语句：
<Compile Include="$(SPOCLIENT)/DeviceCode/Drivers/Stubs/Processor/stubs_PreStackInit/$(AS_SUBDIR)/PreStackInit_stub.s" />
修改为：
<Compile Include="$(SPOCLIENT)/Solutions/STM32F103ZE_RedCow/DeviceCode/Drivers/Stubs/Processor/stubs_PreStackInit/RVDS/PreStackInit_stub.s" />
修改完毕后，再一次编译NativeSample工程，以确保路径修改正确。当这一步也能够正常编译通过之后，那么接下来我们就可以着手修改PreStackInit_stub.s文件了。
5. 用文本编辑器打开拷贝过来的PreStackInit_stub.s文件，完善PreStackInit函数。为了简单起见，这里直接将所有的源代码贴出来：
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Copyright (c) Microsoft Corporation. All rights reserved.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
EXPORT PreStackInit
IMPORT PreStackInit_Exit_Pointer
PRESERVE8
AREA SectionForBootstrapOperations, CODE, READONLY
ENTRY
; ARM directive is only valid for ARM/THUMB processor, but not CORTEX
IF :DEF:COMPILE_ARM :LOR: :DEF:COMPILE_THUMB
ARM
ENDIF
PreStackInit
;*************************************************************************
;
; TODO: Enter your pre stack initialization code here (if needed)
; e.g. SDRAM initialization if you don't have/use SRAM for the stack
;
;Initialize the SRAM
; Enable FSMC clock
LDR R0,= 0x00000114
LDR R1,= 0x40021014
STR R0,[R1]
; Enable GPIOD, GPIOE, GPIOF and GPIOG clocks
LDR R0,= 0x000001E0
LDR R1,= 0x40021018
STR R0,[R1]
; SRAM Data lines, NOE and NWE configuration
; SRAM Address lines configuration
; NOE and NWE configuration
; NE3 configuration
; NBL0, NBL1 configuration
LDR R0,= 0x44BB44BB
LDR R1,= 0x40011400
STR R0,[R1]
LDR R0,= 0xBBBBBBBB
LDR R1,= 0x40011404
STR R0,[R1]
LDR R0,= 0xB44444BB
LDR R1,= 0x40011800
STR R0,[R1]
LDR R0,= 0xBBBBBBBB
LDR R1,= 0x40011804
STR R0,[R1]
LDR R0,= 0x44BBBBBB
LDR R1,= 0x40011C00
STR R0,[R1]
LDR R0,= 0xBBBB4444
LDR R1,= 0x40011C04
STR R0,[R1]
LDR R0,= 0x44BBBBBB
LDR R1,= 0x40012000
STR R0,[R1]
LDR R0,= 0x44444B44
LDR R1,= 0x40012004
STR R0,[R1]
; FSMC Configuration
; Enable FSMC Bank1_SRAM Bank
LDR R0,= 0x00001000
LDR R1,= 0xA0000010
STR R0,[R1]
LDR R0,= 0x00000200
LDR R1,= 0xA0000014
STR R0,[R1]
LDR R0,= 0x0FFFFFFF
LDR R1,= 0xA0000114
STR R0,[R1]
LDR R0,= 0x00001001
LDR R1,= 0xA0000010
STR R0,[R1]
; Reset the vector list address to the begin of SRAM which is 0x20000000
IF TargetLocation="RAM"
LDR R0,= 0x20000000
LDR R1,= 0xE000ED08
STR R0,[R1]
ENDIF
;*************************************************************************
; DO NOT CHANGE THE FOLLOWING CODE! we can not use pop to return because we
; loaded the PC register to get here (since the stack has not been initialized).
; Make sure the PreStackInit_Exit_Pointer is within range and
; in the SectionForBootstrapOperations
; go back to the firstentry(_loader) code
;
;
PreStackEnd
B PreStackInit_Exit_Pointer
;
;**************************************************************************
IF :DEF:COMPILE_THUMB
THUMB
ENDIF
END
