STM32啟動過程詳解

一、STM32啟動文件詳細解析

STM32啟動文件詳細解析（V3.5.0） 以:startup_stm32f10x_hd.s為例

;********************(C)COPYRIGHT2011STMicroelectronics********************

;*FileName:startup_stm32f10x_hd.s

;*Author:MCDApplicationTeam

;*Version:V3.5.0

;*Date:11-March-2011

;*Description:STM32F10xHighDensityDevicesvectortableforMDK-ARM

;*toolchain.

;*Thismoduleperforms:

;*-SettheinitialSP

;*-SettheinitialPC==Reset_Handler

;*-SetthevectortableentrieswiththeexceptionsISRaddress

;*-Configuretheclocksystemandalsoconfiguretheexternal

;*SRAMmountedonSTM3210E-EVALboardtobeusedasdata

;*memory(optional,tobeenabledbyuser)

;*-Branchesto__mainintheClibrary(whicheventually

;*callsmain()).

;*AfterResettheCortexM3processorisinThreadmode,

;*priorityisPrivileged,andtheStackissettoMain.

;*<<>>

;*******************************************************************************

;THEPRESENTFIRMWAREWHICHISFORGUIDANCEONLYAIMSATPROVIDINGCUSTOMERS

;WITHCODINGINFORMATIONREGARDINGTHEIRPRODUCTSINORDERFORTHEMTOSAVETIME.

;ASARESULT,STMICROELECTRONICSSHALLNOTBEHELDLIABLEFORANYDIRECT,

;INDIRECTORCONSEQUENTIALDAMAGESWITHRESPECTTOANYCLAIMSARISINGFROMTHE

;CONTENTOFSUCHFIRMWAREAND/ORTHEUSEMADEBYCUSTOMERSOFTHECODING

;INFORMATIONCONTAINEDHEREININCONNECTIONWITHTHEIRPRODUCTS.

;*******************************************************************************

;Amountofmemory(inbytes)allocatedforStack

;Tailorthisvaluetoyourapplicationneeds

;StackConfiguration;棧定義

;StackSize(inBytes)<0x0-0xFFFFFFFF:8>

;

Stack_SizeEQU0x00000400;EQU偽指令，作用是左邊的符號名代表右邊的表達式

AREASTACK,NOINIT,READWRITE,ALIGN=3;定義棧段：名稱為STACK，未初始化，可讀寫，ELF的棧段按2^3=8對齊

Stack_MemSPACEStack_Size;分配一片連續(xù)的存儲區(qū)域并初始化為0，棧空間：0x400個字節(jié)

__initial_sp;?？臻g頂?shù)刂?/p>

;HeapConfiguration;堆定義

;HeapSize(inBytes)<0x0-0xFFFFFFFF:8>

;

Heap_SizeEQU0x00000200

AREAHEAP,NOINIT,READWRITE,ALIGN=3

__heap_base;堆空間起始地址

Heap_MemSPACEHeap_Size;堆空間:0x200個字節(jié)

__heap_limit;堆空間結束地址

PRESERVE8;PRESERVE8指令指定當前文件保持堆棧八字節(jié)對齊

THUMB;告訴匯編器下面是32位的Thumb指令，如果需要匯編器將插入位以保證對齊

;VectorTableMappedtoAddress0atReset;中斷向量表定義

;實際上是在CODE區(qū)（假設STM32從FLASH啟動，則此中斷向量表起始地址即為0x8000000）

AREARESET,DATA,READONLY;定義一塊數(shù)據(jù)段，只可讀，段名字是RESET

EXPORT__Vectors;EXPORT:在程序中聲明一個全局的標號__Vectors，該標號可在其他的文件中引用