STM32启动文件详解及SystemInit函数分析

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Lumhao 发布时间：2016-7-20 11:05

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先在RAM中分配系统使用的栈，RAM的起始地址为0x2000_0000然后在RAM中分配变量使用的堆然后在CODE区(flash)分配中断向量表，flash的起始地址为0x0800_0000，该中断向量表就从这个起始地址开始分配分配完成后，再定义和实现相应的中断函数，所有的中断函数全部带有[weak]特性，即弱定义，如果编译器发现在别处文件中定义了同名函数，在链接时用别处的地址进行链接。中断函数仅仅实现了Reset_Handler,其他要么是死循环，要么仅仅定义了函数名称STM32被设置为从内部FLASH启动时（这也是最常见的一种情况），当STM32遇到复位信号后，从0x0800_0000处取出栈顶地址存放于MSP寄存器，从0x0800_0004处取出复位中断服务入口地址放入PC寄存器，继而执行复位中断服务程序Reset_Handler，Reset_Handler仅仅执行了两个函数调用,一个是SystemInit，另一个__main,SystemInit定义在system_stm32f10x.c中,主要初始化了STM的时钟系统:HSI,HSE,LSI,LSE,PLL,SYSCLK,USBCLK,APECLK等等.__main函数由编译器生成，负责初始化栈、堆等，并在最后跳转到用户自定义的main()函数，来到C的世界。

Stack_Size EQU 0x00000400 ;//定义堆栈大小8 K; \) J# G: C, T* {
AREA STACK, NOINIT, READWRITE, ALIGN=3 ;//定义一个数据段按8字节对齐 ;AREA 伪指令用于定义一个代码段或数据段 NOINIT：指定此数据段仅仅保留了内存单元，而没有将各初始值写入内存单元，或者将各个内存单元值初始化为0! d) @' D4 J9 y/ d& `
Stack_Mem SPACE Stack_Size ;//保留Stack_Size大小的堆栈空间分配连续 Stack_Size 字节的存储单元并初始化为 0
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__initial_sp ;//标号，代表堆栈顶部地址，后面有用
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<h> Heap Configuration0 i0 U5 ^6 |) A4 O! b8 h5 E
<o> Heap Size (in Bytes) <0x0-0xFFFFFFFF:8>
# {$ f% b* @( t/ P
</h>* ?$ {# x/ T h- I# F
Heap_Size EQU 0x00000200 ;//定义堆空间大小
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AREA HEAP, NOINIT, READWRITE, ALIGN=3 ;//定义一个数据段，8字节对齐
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__heap_base ;//标号，代表堆末底部地址，后面有用
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Heap_Mem SPACE Heap_Size ;//保留Heap_Size的堆空间 * j0 A$ M- K" ?2 L
__heap_limit ;//标号，代表堆界限地址，后面有用
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PRESERVE8 指令指定当前文件保持堆栈八字节对齐。它设置 PRES8 编译属性以通知链接器。
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链接器检查要求堆栈八字节对齐的任何代码是否仅由保持堆栈八字节对齐的代码直接或间接地调用。6 {/ j" m+ P9 {% @; |* X
PRESERVE8 ;//指示编译器8字节对齐2 O' v6 \& [' J% y
THUMB ;//指示编译器以后的指令为THUMB指令 ( j/ C' _' e, ?. y5 L7 O- t
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中断向量表定义
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Vector Table Mapped to Address 0 at Reset/ H3 b5 a3 c! h+ _6 [9 B' u
AREA RESET, DATA, READONLY ;//定义只读数据段，其实放在CODE区，位于0地址
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EXPORT __Vectors ;EXPORT：在程序中声明一个全局的标号__Vectors，该标号可在其他的文件中引用
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EXPORT __Vectors_End" ~- h" h2 v1 r
EXPORT __Vectors_Size
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__Vectors DCD __initial_sp ; Top of Stack ;给__initial_sp分配4字节32位的地址0x0
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DCD Reset_Handler ; Reset Handler ; 给标号Reset Handler分配地址为0x00000004
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DCD NMI_Handler ; NMI Handler ; 给标号NMI Handler分配地址0x00000008- u, ^, E+ ?7 E; ^1 ~6 m
DCD HardFault_Handler ; Hard Fault Handler8 G* M* K" C. c! {
DCD MemManage_Handler ; MPU Fault Handler
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DCD BusFault_Handler ; Bus Fault Handler! i" X1 s- M" O
DCD UsageFault_Handler ; Usage Fault Handler6 K2 ^4 ^9 H; E2 `( M% t& E* R
DCD 0 ; Reserved ; 这种形式就是保留地址，不给任何标号分配5 \& ^8 G9 |+ w
DCD 0 ; Reserved
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DCD 0 ; Reserved% d( C$ ~# y9 |1 B
DCD 0 ; Reserved
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DCD SVC_Handler ; SVCall Handler
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DCD DebugMon_Handler ; Debug Monitor Handler
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DCD 0 ; Reserved* N5 {! G. g7 n. m% m3 W9 Z3 e
DCD PendSV_Handler ; PendSV Handler, C2 I6 Y+ _2 q, `# Q* V
DCD SysTick_Handler ; SysTick Handler, u: _8 E& ?1 w2 @9 n4 s$ e% o
; External Interrupts
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DCD WWDG_IRQHandler ; Window Watchdog, n/ D$ f+ i9 I" ^
DCD PVD_IRQHandler ; PVD through EXTI Line detect9 s$ e. h" N2 ?- c6 z& F! i
DCD TAMPER_IRQHandler ; Tamper. h+ N; [+ J' P5 h& i
DCD RTC_IRQHandler ; RTC, q9 D6 ~( h: u; ?
DCD FLASH_IRQHandler ; Flash; m" x# g7 V; z1 R/ y
DCD RCC_IRQHandler ; RCC* t) R! K# `7 M+ B$ T
DCD EXTI0_IRQHandler ; EXTI Line 09 C- j8 a. j h m) @$ S3 @* B; s
DCD EXTI1_IRQHandler ; EXTI Line 1+ R; B/ J _6 \
DCD EXTI2_IRQHandler ; EXTI Line 2
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DCD EXTI3_IRQHandler ; EXTI Line 33 }3 t G* \" ?) ~1 W
DCD EXTI4_IRQHandler ; EXTI Line 4& z1 C: ?4 A% p* e2 @0 l d6 y$ g
DCD DMA1_Channel1_IRQHandler ; DMA1 Channel 17 }, @3 u( }- h4 l" {( {) q
DCD DMA1_Channel2_IRQHandler ; DMA1 Channel 2
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DCD DMA1_Channel3_IRQHandler ; DMA1 Channel 3
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DCD DMA1_Channel4_IRQHandler ; DMA1 Channel 4
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DCD DMA1_Channel5_IRQHandler ; DMA1 Channel 5
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DCD DMA1_Channel6_IRQHandler ; DMA1 Channel 6
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DCD DMA1_Channel7_IRQHandler ; DMA1 Channel 71 ~, r; K0 c! }) }; K* ]
DCD ADC1_2_IRQHandler ; ADC1 & ADC2
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DCD USB_HP_CAN1_TX_IRQHandler ; USB High Priority or CAN1 TX
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DCD USB_LP_CAN1_RX0_IRQHandler ; USB Low Priority or CAN1 RX0
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DCD CAN1_RX1_IRQHandler ; CAN1 RX1& a' Z' x4 u& o( s( K
DCD CAN1_SCE_IRQHandler ; CAN1 SCE
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DCD EXTI9_5_IRQHandler ; EXTI Line 9..5
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DCD TIM1_BRK_IRQHandler ; TIM1 Break6 a5 Q/ E: z! h
DCD TIM1_UP_IRQHandler ; TIM1 Update. ]; P) |, s' B, a% J; L
DCD TIM1_TRG_COM_IRQHandler ; TIM1 Trigger and Commutation
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DCD TIM1_CC_IRQHandler ; TIM1 Capture Compare8 L0 X- f# D& a4 g
DCD TIM2_IRQHandler ; TIM22 \& }' q8 ~, q
DCD TIM3_IRQHandler ; TIM3# @$ ]3 ? ]( }. w: r0 C& _3 x
DCD TIM4_IRQHandler ; TIM4
4 M. [. Y7 Z2 p% K
DCD I2C1_EV_IRQHandler ; I2C1 Event, I1 `% G* t5 Y8 a I
DCD I2C1_ER_IRQHandler ; I2C1 Error- g7 E# E ~4 w' D4 o8 [
DCD I2C2_EV_IRQHandler ; I2C2 Event
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DCD I2C2_ER_IRQHandler ; I2C2 Error4 w9 j8 R0 M; E! j5 M
DCD SPI1_IRQHandler ; SPI1
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DCD SPI2_IRQHandler ; SPI2! Y. O( c7 ?. H4 N. @: ~
DCD USART1_IRQHandler ; USART1
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DCD USART2_IRQHandler ; USART2
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DCD USART3_IRQHandler ; USART3
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DCD EXTI15_10_IRQHandler ; EXTI Line 15..10: B5 k5 g0 z8 ^" G/ a7 l
DCD RTCAlarm_IRQHandler ; RTC Alarm through EXTI Line
$ j' f4 k0 }& \4 p
DCD USBWakeUp_IRQHandler ; USB Wakeup from suspend* w: A" g) \& S9 D% O; q- c/ P
DCD TIM8_BRK_IRQHandler ; TIM8 Break! _* q- }% z! t$ Q
DCD TIM8_UP_IRQHandler ; TIM8 Update6 e- v& `; Z; h1 T$ z; x$ D4 @4 d
DCD TIM8_TRG_COM_IRQHandler ; TIM8 Trigger and Commutation% | P& d8 D* M3 U- Z
DCD TIM8_CC_IRQHandler ; TIM8 Capture Compare0 K5 M1 \7 d* z* v" m
DCD ADC3_IRQHandler ; ADC3; x: o" J5 [. {% n
DCD FSMC_IRQHandler ; FSMC
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DCD SDIO_IRQHandler ; SDIO
1 P$ b9 ]2 G* Y- P# Q
DCD TIM5_IRQHandler ; TIM5
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DCD SPI3_IRQHandler ; SPI3: m) l1 o) U8 A
DCD UART4_IRQHandler ; UART48 b0 D U; a) w- V0 ~( v; m( g( B
DCD UART5_IRQHandler ; UART5
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DCD TIM6_IRQHandler ; TIM6
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DCD TIM7_IRQHandler ; TIM7, t+ i- d$ K7 |0 o' f4 I; x
DCD DMA2_Channel1_IRQHandler ; DMA2 Channel1! F9 D5 ~* H' u5 E/ y& \
DCD DMA2_Channel2_IRQHandler ; DMA2 Channel2
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DCD DMA2_Channel3_IRQHandler ; DMA2 Channel3
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DCD DMA2_Channel4_5_IRQHandler ; DMA2 Channel4 & Channel55 m3 N8 g9 L6 A! u; ~( g
__Vectors_End
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__Vectors_Size EQU __Vectors_End - __Vectors' X" P% |( P) B1 l9 N6 [$ y/ H
AREA |.text|, CODE, READONLY ;代码段定义& S- x" E3 X* J& Y) @9 V
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Reset Handler! \: f5 n5 W" G* `# w
利用PROC、ENDP这一对伪指令把程序段分为若干个过程，使程序的结构加清晰8 {) B6 e! Y! h
Reset_Handler PROC ;过程的开始
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EXPORT Reset_Handler [WEAK];[WEAK] 弱定义，意思是如果在别处也定义该标号(函数)，在链接时用别处的地址。2 i3 v7 L) W Y& C
;如果没有其它定方定义，编译器也不报错，以此处地址进行链接。/ h, C9 c! s. K* o, ^
;EXPORT提示编译器该标号可以为外部文件引用。
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IMPORT __main ;通知编译器要使用的标号在其他文件4 S% G9 Z' E. X
IMPORT SystemInit* u3 s5 @) @- ~- O# m X
LDR R0, =SystemInit
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BLX R0 ;BX是ARM指令集和THUMB指令集之间程序的跳转
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LDR R0, =__main ;使用“=”表示LDR目前是伪指令不是标准指令。这里是把__main的地址给RO。/ k0 J$ R1 N; t0 D
BX R0 ;BX是ARM指令集和THUMB指令集之间程序的跳转0 C( l1 N- p2 b% D) K: J
ENDP ;过程的结束
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Dummy Exception Handlers (infinite loops which can be modified)# |9 m; r, a! \9 I9 v
NMI_Handler PROC
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EXPORT NMI_Handler [WEAK], [3 g+ s, {/ O
B . ;原地跳转(即无限循环)，" O# g" ]4 t$ Q) q2 P
ENDP
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HardFault_Handler\
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PROC/ y: c* g" T" u% D5 d- K, o
EXPORT HardFault_Handler [WEAK]
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ENDP
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MemManage_Handler\$ X; U4 y8 G# o) f" d& L) t: N
PROC( ]7 g0 }: @: C" U7 a/ B! e
EXPORT MemManage_Handler [WEAK]* I* N3 E% I9 {
B .
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ENDP
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BusFault_Handler\
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PROC
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EXPORT BusFault_Handler [WEAK]
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ENDP; s( S& D! r0 o
UsageFault_Handler\
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PROC
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EXPORT UsageFault_Handler [WEAK]6 N; Q4 R+ L, E0 E( f: X' Z5 X& H
B .
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ENDP# g/ `3 G2 R) c8 y, \2 y
SVC_Handler PROC# P( z+ [% m5 ~. ?( l3 |; ?, i
EXPORT SVC_Handler [WEAK]
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ENDP
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DebugMon_Handler\
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PROC
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EXPORT DebugMon_Handler [WEAK]
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B .
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ENDP
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PendSV_Handler PROC
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EXPORT PendSV_Handler [WEAK]1 D7 g+ x8 x3 D
B .
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ENDP
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SysTick_Handler PROC! f2 u" |4 N/ d. l! G
EXPORT SysTick_Handler [WEAK]! T% u# A& R/ x
B .
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ENDP' m5 M$ ~* d. Z; A
Default_Handler PROC: Y% p: |" F; Z( u
EXPORT WWDG_IRQHandler [WEAK]6 q6 t J5 q# N- V+ ^- j
EXPORT PVD_IRQHandler [WEAK], }" A( e% U, S% O! b0 K
EXPORT TAMPER_IRQHandler [WEAK]
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EXPORT RTC_IRQHandler [WEAK]% x2 M& W/ _% V1 u3 z
EXPORT FLASH_IRQHandler [WEAK]
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EXPORT RCC_IRQHandler [WEAK]' a6 o% G8 R: ]
EXPORT EXTI0_IRQHandler [WEAK]
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EXPORT EXTI1_IRQHandler [WEAK]
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EXPORT EXTI2_IRQHandler [WEAK]
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EXPORT EXTI3_IRQHandler [WEAK]3 m. I- }7 Q8 ~3 x
EXPORT EXTI4_IRQHandler [WEAK]6 r' |5 u. W% t/ U3 u
EXPORT DMA1_Channel1_IRQHandler [WEAK]1 Y8 `) E- u" Y+ ^
EXPORT DMA1_Channel2_IRQHandler [WEAK] f" f% C* r* ^& e& v6 N, Q p
EXPORT DMA1_Channel3_IRQHandler [WEAK]
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EXPORT DMA1_Channel4_IRQHandler [WEAK]/ n0 B$ G; ^) u j
EXPORT DMA1_Channel5_IRQHandler [WEAK]
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EXPORT DMA1_Channel6_IRQHandler [WEAK]& j! x$ O# D0 t! p( h
EXPORT DMA1_Channel7_IRQHandler [WEAK]
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EXPORT ADC1_2_IRQHandler [WEAK]
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EXPORT USB_HP_CAN1_TX_IRQHandler [WEAK]
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EXPORT USB_LP_CAN1_RX0_IRQHandler [WEAK]
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EXPORT CAN1_RX1_IRQHandler [WEAK]; `5 L, R" i, [: m: s- @$ M3 @$ K; \
EXPORT CAN1_SCE_IRQHandler [WEAK]
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EXPORT EXTI9_5_IRQHandler [WEAK]- Q8 }# {2 g1 H
EXPORT TIM1_BRK_IRQHandler [WEAK]' z3 {) j; |% ?$ p1 p
EXPORT TIM1_UP_IRQHandler [WEAK]+ ]# _, p+ K' s8 E/ k" r
EXPORT TIM1_TRG_COM_IRQHandler [WEAK]
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EXPORT TIM1_CC_IRQHandler [WEAK]9 f4 n/ `( z9 l q; N1 ]# n2 G) E
EXPORT TIM2_IRQHandler [WEAK]8 Q3 F0 }* t( ~2 Q8 a
EXPORT TIM3_IRQHandler [WEAK]! G x) s0 `- D2 L4 D. p
EXPORT TIM4_IRQHandler [WEAK]7 {1 k3 N1 M5 k5 y
EXPORT I2C1_EV_IRQHandler [WEAK]
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EXPORT I2C1_ER_IRQHandler [WEAK]3 ~ r9 Z0 x( W, y2 q0 E
EXPORT I2C2_EV_IRQHandler [WEAK]- B$ c+ S* {5 X& v( V4 L
EXPORT I2C2_ER_IRQHandler [WEAK]
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EXPORT SPI1_IRQHandler [WEAK]
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EXPORT SPI2_IRQHandler [WEAK]
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EXPORT USART1_IRQHandler [WEAK]
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EXPORT USART2_IRQHandler [WEAK]3 P& i4 x: A/ K& W S
EXPORT USART3_IRQHandler [WEAK]
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EXPORT EXTI15_10_IRQHandler [WEAK]
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EXPORT RTCAlarm_IRQHandler [WEAK]. p0 E$ u; D* c. P& L
EXPORT USBWakeUp_IRQHandler [WEAK]
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EXPORT TIM8_BRK_IRQHandler [WEAK]* w' p5 ?6 x; \& H% p
EXPORT TIM8_UP_IRQHandler [WEAK]6 _1 G8 d4 d. N% A, y% Z
EXPORT TIM8_TRG_COM_IRQHandler [WEAK]
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EXPORT TIM8_CC_IRQHandler [WEAK]
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EXPORT ADC3_IRQHandler [WEAK]. E. M1 s% {" t" j1 P, n! C
EXPORT FSMC_IRQHandler [WEAK]: |7 x2 w- ]6 R& {
EXPORT SDIO_IRQHandler [WEAK]
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EXPORT TIM5_IRQHandler [WEAK]& P: H6 ^* N( {9 N6 Z, C4 U4 x
EXPORT SPI3_IRQHandler [WEAK] }4 f$ q# Y) L4 R7 f6 u
EXPORT UART4_IRQHandler [WEAK]
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EXPORT UART5_IRQHandler [WEAK]' M2 D8 A# k& h# V7 n. G0 ^) z$ Q' r
EXPORT TIM6_IRQHandler [WEAK]
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EXPORT TIM7_IRQHandler [WEAK]
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EXPORT DMA2_Channel1_IRQHandler [WEAK]
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EXPORT DMA2_Channel2_IRQHandler [WEAK]
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EXPORT DMA2_Channel3_IRQHandler [WEAK]
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EXPORT DMA2_Channel4_5_IRQHandler [WEAK]
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WWDG_IRQHandler
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PVD_IRQHandler
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TAMPER_IRQHandler% i- L4 x+ R* u2 }
RTC_IRQHandler1 X' ?4 Y) p- i9 c
FLASH_IRQHandler
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RCC_IRQHandler+ s! h4 \; A0 o; Y
EXTI0_IRQHandler
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EXTI1_IRQHandler
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EXTI2_IRQHandler
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EXTI3_IRQHandler
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EXTI4_IRQHandler
3 _7 X) M. u" g( B* _8 _
DMA1_Channel1_IRQHandler
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DMA1_Channel2_IRQHandler
: b% g( l1 \1 ]
DMA1_Channel3_IRQHandler, S& f! R+ C) S- H4 n' G
DMA1_Channel4_IRQHandler
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DMA1_Channel5_IRQHandler
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DMA1_Channel6_IRQHandler
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DMA1_Channel7_IRQHandler
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ADC1_2_IRQHandler
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USB_HP_CAN1_TX_IRQHandler
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USB_LP_CAN1_RX0_IRQHandler
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CAN1_RX1_IRQHandler% p, C$ k* [8 j% A% i! S9 d. Z7 n' p7 ^
CAN1_SCE_IRQHandler
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EXTI9_5_IRQHandler- h/ B) t" n6 J" o- C
TIM1_BRK_IRQHandler
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TIM1_UP_IRQHandler
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TIM1_TRG_COM_IRQHandler
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TIM1_CC_IRQHandler
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TIM2_IRQHandler1 O- Q! e" K- [/ |# t2 p+ ]
TIM3_IRQHandler; i# y- T: t& z% w, J! ]: n0 x$ T- b
TIM4_IRQHandler
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I2C1_EV_IRQHandler
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I2C1_ER_IRQHandler
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I2C2_EV_IRQHandler$ v+ z ]; g4 z9 b, Y% t
I2C2_ER_IRQHandler1 a7 _+ b! L% f! O3 E. J) v
SPI1_IRQHandler
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SPI2_IRQHandler6 J$ [4 R, n, v- S2 ^6 q
USART1_IRQHandler
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USART2_IRQHandler! J2 W5 u4 o G) J
USART3_IRQHandler# E% V. y$ f* M. s
EXTI15_10_IRQHandler
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RTCAlarm_IRQHandler
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USBWakeUp_IRQHandler! ^ T8 ^* T" p( c9 S# W2 w$ R
TIM8_BRK_IRQHandler& r, o) o- f( f( ]
TIM8_UP_IRQHandler
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TIM8_TRG_COM_IRQHandler
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TIM8_CC_IRQHandler
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ADC3_IRQHandler
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FSMC_IRQHandler
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SDIO_IRQHandler. [, h/ |# o2 Q L
TIM5_IRQHandler
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SPI3_IRQHandler0 K) G) p- V/ p+ G0 t) C; |" w; W
UART4_IRQHandler6 U3 r6 s# g1 a* O3 N
UART5_IRQHandler
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TIM6_IRQHandler
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TIM7_IRQHandler. X! ]. f& F7 ^$ X
DMA2_Channel1_IRQHandler
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DMA2_Channel2_IRQHandler
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DMA2_Channel3_IRQHandler2 X' ], f/ @6 ~; B' |' e
DMA2_Channel4_5_IRQHandler
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B .; k: `7 T3 @& N3 Y+ a, |
ENDP( p0 v% O7 D6 P" n8 f
ALIGN ;填充字节使地址对齐# y: J% R" S( b& X1 ?, f: @
*******************************************************************************! W$ A+ [) G1 r' Q- x9 d+ s# d
User Stack and Heap initialization
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*******************************************************************************/ A' q5 w; \8 U0 N4 J$ z. ?
堆和栈的初始化
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IF :DEF:__MICROLIB ;“DEF”的用法——:DEF:X 就是说X定义了则为真，否则为假
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;如果定义了MICORLIB,
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EXPORT __initial_sp ;则将栈顶地址，0 _5 ]' G$ ^) I. ^. e
EXPORT __heap_base ;堆起始地址赋予全局属性，/ p: q$ W1 p- E7 Y
EXPORT __heap_limit ;堆末端界限地址赋予全局属性,使外部程序可调用4 d5 ~3 n E& a9 Z3 h# m
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ELSE ;如果没定义__MICROLIB,则使用默认的C运行时库
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f' _, ~4 W" H) v0 S+ j
IMPORT __use_two_region_memory ;;通知编译器要使用的标号在其他文件__use_two_region_memory 8 w" M2 k1 M4 ~3 T
EXPORT __user_initial_stackheap ;声明全局标号__user_initial_stackheap，这样外程序也可调用此标号
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;则进行堆栈和堆的赋值，在__main函数执行过程中调用: @. c: {$ T+ ]- y- G. R, ~
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;如果使用默认的C库,程序启动过程中就不会执行该标号下的代码( Q& v6 V$ T7 d
__user_initial_stackheap ;标号__user_initial_stackheap，表示用户堆栈初始化程序入口
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;//则进行堆栈和堆的赋值，在__main函数执行过程中调用。
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LDR R0, = Heap_Mem ;保存堆始地址0 | [( x, T5 w8 `) X
LDR R1, =(Stack_Mem + Stack_Size) ;保存栈的大小
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LDR R2, = (Heap_Mem + Heap_Size) ;保存堆的大小
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LDR R3, = Stack_Mem ;保存栈顶指针! z- E" A+ R' E' i% Q
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ALIGN ;填充字节使地址对齐) z2 x [0 i- n: B" I
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ENDIF
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END