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1、自己圍觀，自我滿足STM32啟動(dòng)代碼分析??啟動(dòng)代碼文件名是STM32F10X.S，它的作用先總結(jié)下，然后再分析。啟動(dòng)代碼作用一般是：1）堆和棧的初始化；2）向量表定義；3）地址重映射及中斷向量表的轉(zhuǎn)移；4）設(shè)置系統(tǒng)時(shí)鐘頻率；5）中斷寄存器的初始化；6）進(jìn)入C應(yīng)用程序。??（1）按啟動(dòng)代碼的次序，先看堆和棧的初始化：Stack_Size????EQU????0x00000200????；定義Stack_Size為0x00000200??????????AREA??STACK,NOINIT,READWRITE,ALIGN=3??；定義棧，可初始為0，8字節(jié)對(duì)齊Stack_Mem????SPACE
2、??Stack_Size????；分配0x200個(gè)連續(xù)字節(jié)，并初始化為0__initial_sp??；匯編代碼地址標(biāo)號(hào)Heap_Size????EQU????0x00000000??????????AREA??HEAP,NOINIT,READWRITE,ALIGN=3__heap_baseHeap_Mem??????SPACE??Heap_Size__heap_limit??????????PRESERVE8；指定當(dāng)前文件堆棧8字節(jié)對(duì)齊??????????THUMB????；告訴匯編器下面是32為的Thumb指令，如果需要匯編器將插入位以保證對(duì)齊??（2）中斷向量表定義AREA??RESET,
3、DATA,READONLY;定義復(fù)位向量段，只讀??????????EXPORT??__Vectors??；定義一個(gè)可以在其他文件中使用的全局標(biāo)號(hào)。此處表示中斷地址__Vectors????DCD????__initial_sp??????????;給__initial_sp分配4字節(jié)32位的地址0x0??????????DCD????Reset_Handler????????;給標(biāo)號(hào)ResetHandler分配地址為0x00000004??????????DCD????NMI_Handler??????????;給標(biāo)號(hào)NMIHandler分配地址0x00000008??????????DCD
4、????HardFault_Handler??????;HardFaultHandler??????????DCD????MemManage_Handler??????;MPUFaultHandler??????????DCD????BusFault_Handler??????;BusFaultHandler??????????DCD????UsageFault_Handler??????;UsageFaultHandler??????????DCD????0????????????????;這種形式就是保留地址，不給任何標(biāo)號(hào)分配??????????DCD????0??????????????
5、??;Reserved??????????DCD????0????????????????;Reserved??????????DCD????0????????????????;Reserved??????????DCD????SVC_Handler??????????;SVCallHandler??????????DCD????DebugMon_Handler??????;DebugMonitorHandler??????????DCD????0????????????????;Reserved??????????DCD????PendSV_Handler????????;PendSVHan
6、dler??????????DCD????SysTick_Handler????????;SysTickHandler??????????;ExternalInterrupts??????????DCD????WWDG_IRQHandler????????;WindowWatchdog??????????DCD????PVD_IRQHandler????????;PVDthroughEXTILinedetect??????????DCD????TAMPER_IRQHandler??????;Tamper??????????DCD????RTC_IRQHandler????????;RTC???
7、???????DCD????FLASH_IRQHandler??????;Flash??????????DCD????RCC_IRQHandler????????;RCC??????????DCD????EXTI0_IRQHandler??????;EXTILine0??????????DCD????EXTI1_IRQHandler??????;EXTILine1??????????DCD????
