解析STM32启动过程

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相对于ARM上一代的主流ARM7/ARM9内核架构，新一代Cortex内核架构的启动方式有了比较大的变化。ARM7/ARM9内核的控制器在复位后，CPU会从存储

空间的绝对地址0x000000取出第一条指令执行复位中断服务程序的方式启动，即固定了复位后的起始地址为0x000000（PC = 0x000000）同时中断向量表

的位置并不是固定的。而Cortex-M3内核则正好相反，有3种情况:

1、通过boot引脚设置可以将中断向量表定位于SRAM区，即起始地址为0x2000000，同时复位后PC指针位于0x2000000处；

2、通过boot引脚设置可以将中断向量表定位于FLASH区，即起始地址为0x8000000，同时复位后PC指针位于0x8000000处；

3、通过boot引脚设置可以将中断向量表定位于内置Bootloader区，本文不对这种情况做论述；

而Cortex-M3内核规定，起始地址必须存放堆顶指针，而第二个地址则必须存放复位中断入口向量地址，这样在Cortex-M3内核复位后，会自动从起始地址

的下一个32位空间取出复位中断入口向量，跳转执行复位中断服务程序。对比ARM7/ARM9内核，Cortex-M3内核则是固定了中断向量表的位置而起始地址

是可变化的。

有了上述准备只是后，下面以STM32的2.02固件库提供的启动文件“stm32f10x_vector.s”为模板，对STM32的启动过程做一个简要而全面的解析。

程序清单一：

；文件“stm32f10x_vector.s”，其中注释为行号

DATA_IN_ExtSRAMEQU0；1

Stack_SizeEQU0x00000400；2

AREASTACK,NOINIT,READWRITE,ALIGN=3；3

Stack_MemSPACEStack_Size；4

__initial_sp；5

Heap_SizeEQU0x00000400；6

AREAHEAP,NOINIT,READWRITE,ALIGN=3；7

__heap_base；8

Heap_MemSPACEHeap_Size；9

__heap_limit；10

THUMB；11

PRESERVE8；12

IMPORTNMIException；13

IMPORTHardFaultException；14

IMPORTMemManageException；15

IMPORTBusFaultException；16

IMPORTUsageFaultException；17

IMPORTSVCHandler；18

IMPORTDebugMonitor；19

IMPORTPendSVC；20

IMPORTSysTickHandler；21

IMPORTWWDG_IRQHandler；22

IMPORTPVD_IRQHandler；23

IMPORTTAMPER_IRQHandler；24

IMPORTRTC_IRQHandler；25

IMPORTFLASH_IRQHandler；26

IMPORTRCC_IRQHandler；27

IMPORTEXTI0_IRQHandler；28

IMPORTEXTI1_IRQHandler；29

IMPORTEXTI2_IRQHandler；30

IMPORTEXTI3_IRQHandler；31

IMPORTEXTI4_IRQHandler；32

IMPORTDMA1_Channel1_IRQHandler；33

IMPORTDMA1_Channel2_IRQHandler；34

IMPORTDMA1_Channel3_IRQHandler；35

IMPORTDMA1_Channel4_IRQHandler；36

IMPORTDMA1_Channel5_IRQHandler；37

IMPORTDMA1_Channel6_IRQHandler；38

IMPORTDMA1_Channel7_IRQHandler；39

IMPORTADC1_2_IRQHandler；40

IMPORTUSB_HP_CAN_TX_IRQHandler；41

IMPORTUSB_LP_CAN_RX0_IRQHandler；42

IMPORTCAN_RX1_IRQHandler；43

IMPORTCAN_SCE_IRQHandler；44

IMPORTEXTI9_5_IRQHandler；45

IMPORTTIM1_BRK_IRQHandler；46

IMPORTTIM1_UP_IRQHandler；47

IMPORTTIM1_TRG_COM_IRQHandler；48

IMPORTTIM1_CC_IRQHandler；49

IMPORTTIM2_IRQHandler；50

IMPORTTIM3_IRQHandler；51

IMPORTTIM4_IRQHandler；52

IMPORTI2C1_EV_IRQHandler；53

IMPORTI2C1_ER_IRQHandler；54

IMPORTI2C2_EV_IRQHandler；55

IMPORTI2C2_ER_IRQHandler；56

IMPORTSPI1_IRQHandler；57

IMPORTSPI2_IRQHandler；58

IMPORTUSART1_IRQHandler；59

IMPORTUSART2_IRQHandler；60

IMPORTUSART3_IRQHandler；61

IMPORTEXTI15_10_IRQHandler；62

IMPORTRTCAlarm_IRQHandler；63

IMPORTUSBWakeUp_IRQHandler；64

IMPORTTIM8_BRK_IRQHandler；65

IMPORTTIM8_UP_IRQHandler；66

IMPORTTIM8_TRG_COM_IRQHandler；67

IMPORTTIM8_CC_IRQHandler；68

IMPORTADC3_IRQHandler；69

IMPORTFSMC_IRQHandler；70

IMPORTSDIO_IRQHandler；71

IMPORTTIM5_IRQHandler；72

IMPORTSPI3_IRQHandler；73

IMPORTUART4_IRQHandler；74

IMPORTUART5_IRQHandler；75

IMPORTTIM6_IRQHandler；76

IMPORTTIM7_IRQHandler；77

IMPORTDMA2_Channel1_IRQHandler；78

IMPORTDMA2_Channel2_IRQHandler；79

IMPORTDMA2_Channel3_IRQHandler；80

IMPORTDMA2_Channel4_5_IRQHandler；81

AREARESET,DATA,READONLY；82

EXPORT__Vectors；83

__Vectors；84

DCD__initial_sp；85

DCDReset_Handler；86

DCDNMIException；87

DCDHardFaultException；88

DCDMemManageException；89

DCDBusFaultException；90

DCDUsageFaultException；91

DCD0；92

DCD0；93

DCD0；94

DCD0；95

DCDSVCHandler；96

DCDDebugMonitor；97

DCD0；98

DCDPendSVC；99

DCDSysTickHandler；100

DCDWWDG_IRQHandler；101

DCDPVD_IRQHandler；102

DCDTAMPER_IRQHandler；103

DCDRTC_IRQHandler；104

DCDFLASH_IRQHandler；105

DCDRCC_IRQHandler；106

DCDEXTI0_IRQHandler；107

DCDEXTI1_IRQHandler；108

DCDEXTI2_IRQHandler；109

DCDEXTI3_IRQHandler；110

DCDEXTI4_IRQHandler；111

DCDDMA1_Channel1_IRQHandler；112

DCDDMA1_Channel2_IRQHandler；113

DCDDMA1_Channel3_IRQHandler；114

DCDDMA1_Channel4_IRQHandler；115

DCDDMA1_Channel5_IRQHandler；116

DCDDMA1_Channel6_IRQHandler；117

DCDDMA1_Channel7_IRQHandler；118

DCDADC1_2_IRQHandler；119

DCDUSB_HP_CAN_TX_IRQHandler；120

DCDUSB_LP_CAN_RX0_IRQHandler；121

DCDCAN_RX1_IRQHandler；122

DCDCAN_SCE_IRQHandler；123

DCDEXTI9_5_IRQHandler；124

DCDTIM1_BRK_IRQHandler；125

DCDTIM1_UP_IRQHandler；126

DCDTIM1_TRG_COM_IRQHandler；127

DCDTIM1_CC_IRQHandler；128

DCDTIM2_IRQHandler；129

DCDTIM3_IRQHandler；130

DCDTIM4_IRQHandler；131

DCDI2C1_EV_IRQHandler；132

DCDI2C1_ER_IRQHandler；133

DCDI2C2_EV_IRQHandler；134

DCDI2C2_ER_IRQHandler；135

DCDSPI1_IRQHandler；136

DCDSPI2_IRQHandler；137

DCDUSART1_IRQHandler；138

DCDUSART2_IRQHandler；139

DCDUSART3_IRQHandler；140

DCDEXTI15_10_IRQHandler；141

DCDRTCAlarm_IRQHandler；142

DCDUSBWakeUp_IRQHandler；143

DCDTIM8_BRK_IRQHandler；144

DCDTIM8_UP_IRQHandler；145

DCDTIM8_TRG_COM_IRQHandler；146

DCDTIM8_CC_IRQHandler；147

DCDADC3_IRQHandler；148

DCDFSMC_IRQHandler；149

DCDSDIO_IRQHandler；150

DCDTIM5_IRQHandler；151

DCDSPI3_IRQHandler；152

DCDUART4_IRQHandler；153

DCDUART5_IRQHandler；154

DCDTIM6_IRQHandler；155

DCDTIM7_IRQHandler；156

DCDDMA2_Channel1_IRQHandler；157

DCDDMA2_Channel2_IRQHandler；158

DCDDMA2_Channel3_IRQHandler；159

DCDDMA2_Channel4_5_IRQHandler；160

AREA|.text|,CODE,READONLY；161

Reset_HandlerPROC；162

EXPORTReset_Handler；163

IF DATA_IN_ExtSRAM ==