;//
;//
;//
Stack_Size EQU 0x00000200 ;//界说仓库巨细
AREA STACK, NOINIT, READWRITE, ALIGN=3 ;//界说一个数据段 按8字节对齐 ;AREA 伪指令用于界说一个代码段或数据段 NOINIT：指定此数据段只是保存了内存单元，而没有将各初始值写入内存单元，或许将各个内存单元值初始化为0
Stack_Mem SPACE Stack_Size ;//保存Stack_Size巨细的仓库空间 分 配接连 Stack_Size 字节的存储单元并初始化为 0
__initial_sp ;//标号，代表仓库顶部地址，后边有用
;//
;//
;//
Heap_Size EQU 0x00000020 ;//界说堆空间巨细
AREA HEAP, NOINIT, READWRITE, ALIGN=3 ;//界说一个数据段，8字节对齐
__heap_base
Heap_Mem SPACE Heap_Size ;//保存Heap_Size的堆空间
__heap_limit ;//标号，代表堆结尾地址，后边有用
PRESERVE8 ;//指示编译器8字节对齐
THUMB ;//指示编译器为THUMB指令
; Vector Table Mapped to Address 0 at Reset
AREA RESET, DATA, READONLY ;//界说只读数据段，其实放在CODE区，坐落0地址
EXTERN NMIException
EXTERN HardFaultException
EXTERN MemManageException
EXTERN BusFaultException
EXTERN UsageFaultException
EXTERN SVCHandler
EXTERN DebugMonitor
EXTERN PendSVC
EXTERN SysTickHandler ;//声明这些符号在外部界说，同C
;//在××it.c中完结这些函数 ，中止就能主动调用了
EXPORT __Vectors
EXPORT __initial_sp ;EXPORT：在程序中声明一个大局的标号__Vectors，该标号可在其他的文件中引证；IMPORT：伪指令用于告诉编译器要运用的标号在其他的源文件中界说， ;但要在当时源文件中引证，并且不管当时源文件是否引证该标号，该标号均会被加入到当时源文件的符号表中
__Vectors DCD __initial_sp ; Top of Stack //Cotex-M 要求此处为仓库顶部地址
DCD Reset_Handler ; Reset Handler
DCD NMIException ; NMI Handler
DCD HardFaultException ; Hard Fault Handler
DCD MemManageException ; MPU Fault Handler
DCD BusFaultException ; Bus Fault Handler
DCD UsageFaultException ; Usage Fault Handler
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD SVCHandler ; SVCall Handler
DCD DebugMonitor ; Debug Monitor Handler
DCD 0 ; Reserved
DCD PendSVC ; PendSV Handler
DCD SysTickHandler ; SysTick Handler //一大堆的反常处理函数地址
; External Interrupts
EXTERN WWDG_IRQHandler
EXTERN PVD_IRQHandler
EXTERN TAMPER_IRQHandler
EXTERN RTC_IRQHandler
EXTERN FLASH_IRQHandler
EXTERN RCC_IRQHandler
EXTERN EXTI0_IRQHandler
EXTERN EXTI1_IRQHandler
EXTERN EXTI2_IRQHandler
EXTERN EXTI3_IRQHandler
EXTERN EXTI4_IRQHandler
EXTERN DMAChannel1_IRQHandler
EXTERN DMAChannel2_IRQHandler
EXTERN DMAChannel3_IRQHandler
EXTERN DMAChannel4_IRQHandler
EXTERN DMAChannel5_IRQHandler
EXTERN DMAChannel6_IRQHandler
EXTERN DMAChannel7_IRQHandler
EXTERN ADC_IRQHandler
EXTERN USB_HP_CAN_TX_IRQHandler
EXTERN USB_LP_CAN_RX0_IRQHandler
EXTERN CAN_RX1_IRQHandler
EXTERN CAN_SCE_IRQHandler
EXTERN EXTI9_5_IRQHandler
EXTERN TIM1_BRK_IRQHandler
EXTERN TIM1_UP_IRQHandler
EXTERN TIM1_TRG_COM_IRQHandler
EXTERN TIM1_CC_IRQHandler
EXTERN TIM2_IRQHandler
EXTERN TIM3_IRQHandler
EXTERN TIM4_IRQHandler
EXTERN I2C1_EV_IRQHandler
EXTERN I2C1_ER_IRQHandler
EXTERN I2C2_EV_IRQHandler
EXTERN I2C2_ER_IRQHandler
EXTERN SPI1_IRQHandler
EXTERN SPI2_IRQHandler
EXTERN USART1_IRQHandler
EXTERN USART2_IRQHandler
EXTERN USART3_IRQHandler
EXTERN EXTI15_10_IRQHandler
EXTERN RTCAlarm_IRQHandler
EXTERN USBWakeUp_IRQHandler ;//同上，
DCD WWDG_IRQHandler ; Window Watchdog
DCD PVD_IRQHandler ; PVD through EXTI Line detect
DCD TAMPER_IRQHandler ; Tamper
DCD RTC_IRQHandler ; RTC
DCD FLASH_IRQHandler ; Flash
DCD RCC_IRQHandler ; RCC
DCD EXTI0_IRQHandler ; EXTI Line 0
DCD EXTI1_IRQHandler ; EXTI Line 1
DCD EXTI2_IRQHandler ; EXTI Line 2
DCD EXTI3_IRQHandler ; EXTI Line 3
DCD EXTI4_IRQHandler ; EXTI Line 4
DCD DMAChannel1_IRQHandler ; DMA Channel 1
DCD DMAChannel2_IRQHandler ; DMA Channel 2
DCD DMAChannel3_IRQHandler ; DMA Channel 3
DCD DMAChannel4_IRQHandler ; DMA Channel 4
DCD DMAChannel5_IRQHandler ; DMA Channel 5
DCD DMAChannel6_IRQHandler ; DMA Channel 6
DCD DMAChannel7_IRQHandler ; DMA Channel 7
DCD ADC_IRQHandler ; ADC
DCD USB_HP_CAN_TX_IRQHandler ; USB High Priority or CAN TX
DCD USB_LP_CAN_RX0_IRQHandler ; USB Low Priority or CAN RX0
DCD CAN_RX1_IRQHandler ; CAN RX1
DCD CAN_SCE_IRQHandler ; CAN SCE
DCD EXTI9_5_IRQHandler ; EXTI Line 9..5
DCD TIM1_BRK_IRQHandler ; TIM1 Break
DCD TIM1_UP_IRQHandler ; TIM1 Update
DCD TIM1_TRG_COM_IRQHandler ; TIM1 Trigger and Commutation
DCD TIM1_CC_IRQHandler ; TIM1 Capture Compare
DCD TIM2_IRQHandler ; TIM2
DCD TIM3_IRQHandler ; TIM3
DCD TIM4_IRQHandler ; TIM4
DCD I2C1_EV_IRQHandler ; I2C1 Event
DCD I2C1_ER_IRQHandler ; I2C1 Error
DCD I2C2_EV_IRQHandler ; I2C2 Event
DCD I2C2_ER_IRQHandler ; I2C2 Error
DCD SPI1_IRQHandler ; SPI1
DCD SPI2_IRQHandler ; SPI2
DCD USART1_IRQHandler ; USART1
DCD USART2_IRQHandler ; USART2
DCD USART3_IRQHandler ; USART3
DCD EXTI15_10_IRQHandler ; EXTI Line 15..10
DCD RTCAlarm_IRQHandler ; RTC Alarm through EXTI Line
DCD USBWakeUp_IRQHandler ; USB Wakeup from suspend ;//同上
AREA |.text|, CODE, READONLY ;//界说代码段
; Reset Handler
Reset_Handler PROC ;进程的开端
;//Rset_Handler的完结 运用PROC、ENDP这一对伪指令把程序段分为若干个进程，使程序的结构加明晰
EXPORT Reset_Handler [WEAK] ;//在外部没有界说该符号时导出该符号，见HELP中[WEAK]
IMPORT __main ;//导入符号,__main为 运行时库供给的函数；完结仓库，堆的初始话
LDR R0, =__main ;//等作业，会调用下面界说的__user_initial_stackheap；
BX R0 ;//跳到__main，进入C的国际
ENDP ;进程的完毕
ALIGN
; User Initial Stack & Heap
IF :DEF:__MICROLIB ;//假如运用micro lib,micro lib 描绘见armlib.chm
EXPORT __heap_base
EXPORT __heap_limit ;//只导出几个界说
ELSE ;//假如运用默许C运行时库
IMPORT __use_two_region_memory
EXPORT __user_initial_stackheap
__user_initial_stackheap ;//则进行仓库和堆的赋值，在__main函数履行进程中调用。
LDR R0, = Heap_Mem
LDR R1, =(Stack_Mem + Stack_Size)
LDR R2, = (Heap_Mem + Heap_Size)
LDR R3, = Stack_Mem
BX LR
ALIGN
ENDIF
END ;//OK ，完了
http://blog.csdn.net/chehlcy/archive/2010/01/09/5164472.aspx
http://files.ourdev.cn/bbs_upload134190/files_11/ourdev_495775.txt
======================================================================
Reset_Handler PROC
EXPORT Reset_Handler [WEAK]
IMPORT __main
LDR R0, =__main
BX R0
ENDP
这段代码什么意思。
有2个当地不理解
一：PROC ENDP
二： [WEAK] 什么意思
——————————————————————————-
一：PROC为子程序开端，ENDP为子程序完毕
二：[weak]的意思便是弱。
怎样弱呢？假如你在其他当地写一个同名函数，比方Reset_handler, 你写的这个函数就可以替代它这个函数了。
语法格局：
EXPORT 标号 {[WEAK]}
EXPORT 伪指令用于在程序中声明一个大局的标号，该标号可在其他的文件中引证。 EXPORT可用 GLOBAL 替代。标号在程序中区别巨细写， [WEAK] 选项声明其他的同名标号优先于该标号被引证。
运用示例：
AREA Init ， CO
EXPORT Stest ；声明一个可大局引证的标号Stest……
END
