STM32單片的啟動過程解析

STM32單片的啟動過程解析一、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?HeapConfiguration;堆定義;HeapSize（inBytes）《0x0-0xFFFFFFFF:8》;Heap_SizeEQU0x00000200AREAHEAP，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(jié)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(shè)STM32從FLASH啟動，則此中斷向量表起始地址即為0x800000