;先在RAM中分配系統使用的棧,RAM的起始地址爲0x2000_0000
;然後在RAM中分配變量使用的堆
;然後在CODE區(flash)分配中斷向量表,flash的起始地址爲0x0800_0000,該中斷向量表就從這個起始地址開始分配
;分配完成後,再定義和實現相應的中斷函數,
;所有的中斷函數全部帶有[weak]特性,即弱定義,如果編譯器發現在別處文件中定義了同名函數,在鏈接時用別處的地址進行鏈接。
;中斷函數僅僅實現了Reset_Handler,其他要麼是死循環,要麼僅僅定義了函數名稱
;STM32被設置爲從內部FLASH啓動時(這也是最常見的一種情況),當STM32遇到復位信號後,
;從0x0800_0000處取出棧頂地址存放於MSP寄存器,從0x0800_0004處取出復位中斷服務入口地址放入PC寄存器,
;繼而執行復位中斷服務程序Reset_Handler,
;Reset_Handler僅僅執行了兩個函數調用,一個是SystemInit,另一個__main,
;SystemInit定義在system_stm32f10x.c中,主要初始化了STM的時鐘系統:HSI,HSE,LSI,LSE,PLL,SYSCLK,USBCLK,APECLK等等.
;__main函數由編譯器生成,負責初始化棧、堆等,並在最後跳轉到用戶自定義的main()函數,來到C的世界。
Stack_Size EQU 0x00000400 ;//定義堆棧大小
AREA STACK, NOINIT, READWRITE, ALIGN=3 ;//定義一個數據段 按8字節對齊 ;AREA 僞指令用於定義一個代碼段或數據段 NOINIT:指定此數據段僅僅保留了內存單元,而沒有將各初始值寫入內存單元,或者將各個內存單元值初始化爲0
Stack_Mem SPACE Stack_Size ;//保留Stack_Size大小的堆棧空間 分 配連續 Stack_Size 字節的存儲單元並初始化爲 0
__initial_sp ;//標號,代表堆棧頂部地址,後面有用
; <h> Heap Configuration
; <o> Heap Size (in Bytes) <0x0-0xFFFFFFFF:8>
; </h>
Heap_Size EQU 0x00000200 ;//定義堆空間大小
AREA HEAP, NOINIT, READWRITE, ALIGN=3 ;//定義一個數據段,8字節對齊
__heap_base ;//標號,代表堆末底部地址,後面有用
Heap_Mem SPACE Heap_Size ;//保留Heap_Size的堆空間
__heap_limit ;//標號,代表堆界限地址,後面有用
;PRESERVE8 指令指定當前文件保持堆棧八字節對齊。 它設置 PRES8 編譯屬性以通知鏈接器。
;鏈接器檢查要求堆棧八字節對齊的任何代碼是否僅由保持堆棧八字節對齊的代碼直接或間接地調用。
PRESERVE8 ;//指示編譯器8字節對齊
THUMB ;//指示編譯器以後的指令爲THUMB指令
;中斷向量表定義
; Vector Table Mapped to Address 0 at Reset
AREA RESET, DATA, READONLY ;//定義只讀數據段,其實放在CODE區,位於0地址
EXPORT __Vectors ;EXPORT:在程序中聲明一個全局的標號__Vectors,該標號可在其他的文件中引用
EXPORT __Vectors_End
EXPORT __Vectors_Size
__Vectors DCD __initial_sp ; Top of Stack ;給__initial_sp分配4字節32位的地址0x0
DCD Reset_Handler ; Reset Handler ; 給標號Reset Handler分配地址爲0x00000004
DCD NMI_Handler ; NMI Handler ; 給標號NMI Handler分配地址0x00000008
DCD HardFault_Handler ; Hard Fault Handler
DCD MemManage_Handler ; MPU Fault Handler
DCD BusFault_Handler ; Bus Fault Handler
DCD UsageFault_Handler ; Usage Fault Handler
DCD 0 ; Reserved ; 這種形式就是保留地址,不給任何標號分配
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD SVC_Handler ; SVCall Handler
DCD DebugMon_Handler ; Debug Monitor Handler
DCD 0 ; Reserved
DCD PendSV_Handler ; PendSV Handler
DCD SysTick_Handler ; SysTick Handler
; External Interrupts
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 DMA1_Channel1_IRQHandler ; DMA1 Channel 1
DCD DMA1_Channel2_IRQHandler ; DMA1 Channel 2
DCD DMA1_Channel3_IRQHandler ; DMA1 Channel 3
DCD DMA1_Channel4_IRQHandler ; DMA1 Channel 4
DCD DMA1_Channel5_IRQHandler ; DMA1 Channel 5
DCD DMA1_Channel6_IRQHandler ; DMA1 Channel 6
DCD DMA1_Channel7_IRQHandler ; DMA1 Channel 7
DCD ADC1_2_IRQHandler ; ADC1 & ADC2
DCD USB_HP_CAN1_TX_IRQHandler ; USB High Priority or CAN1 TX
DCD USB_LP_CAN1_RX0_IRQHandler ; USB Low Priority or CAN1 RX0
DCD CAN1_RX1_IRQHandler ; CAN1 RX1
DCD CAN1_SCE_IRQHandler ; CAN1 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
DCD TIM8_BRK_IRQHandler ; TIM8 Break
DCD TIM8_UP_IRQHandler ; TIM8 Update
DCD TIM8_TRG_COM_IRQHandler ; TIM8 Trigger and Commutation
DCD TIM8_CC_IRQHandler ; TIM8 Capture Compare
DCD ADC3_IRQHandler ; ADC3
DCD FSMC_IRQHandler ; FSMC
DCD SDIO_IRQHandler ; SDIO
DCD TIM5_IRQHandler ; TIM5
DCD SPI3_IRQHandler ; SPI3
DCD UART4_IRQHandler ; UART4
DCD UART5_IRQHandler ; UART5
DCD TIM6_IRQHandler ; TIM6
DCD TIM7_IRQHandler ; TIM7
DCD DMA2_Channel1_IRQHandler ; DMA2 Channel1
DCD DMA2_Channel2_IRQHandler ; DMA2 Channel2
DCD DMA2_Channel3_IRQHandler ; DMA2 Channel3
DCD DMA2_Channel4_5_IRQHandler ; DMA2 Channel4 & Channel5
__Vectors_End
__Vectors_Size EQU __Vectors_End - __Vectors
AREA |.text|, CODE, READONLY ;代碼段定義
; Reset Handler
;利用PROC、ENDP這一對僞指令把程序段分爲若干個過程,使程序的結構加清晰
Reset_Handler PROC ;過程的開始
EXPORT Reset_Handler [WEAK];[WEAK] 弱定義,意思是如果在別處也定義該標號(函數),在鏈接時用別處的地址。
;如果沒有其它定方定義,編譯器也不報錯,以此處地址進行鏈接。
;EXPORT提示編譯器該標號可以爲外部文件引用。
IMPORT __main ;通知編譯器要使用的標號在其他文件
IMPORT SystemInit
LDR R0, =SystemInit
BLX R0 ;BX是ARM指令集和THUMB指令集之間程序的跳轉
LDR R0, =__main ;使用“=”表示LDR目前是僞指令不是標準指令。這裏是把__main的地址給RO。
BX R0 ;BX是ARM指令集和THUMB指令集之間程序的跳轉
ENDP ;過程的結束
; Dummy Exception Handlers (infinite loops which can be modified)
NMI_Handler PROC
EXPORT NMI_Handler [WEAK]
B . ;原地跳轉(即無限循環),
ENDP
HardFault_Handler\
PROC
EXPORT HardFault_Handler [WEAK]
B .
ENDP
MemManage_Handler\
PROC
EXPORT MemManage_Handler [WEAK]
B .
ENDP
BusFault_Handler\
PROC
EXPORT BusFault_Handler [WEAK]
B .
ENDP
UsageFault_Handler\
PROC
EXPORT UsageFault_Handler [WEAK]
B .
ENDP
SVC_Handler PROC
EXPORT SVC_Handler [WEAK]
B .
ENDP
DebugMon_Handler\
PROC
EXPORT DebugMon_Handler [WEAK]
B .
ENDP
PendSV_Handler PROC
EXPORT PendSV_Handler [WEAK]
B .
ENDP
SysTick_Handler PROC
EXPORT SysTick_Handler [WEAK]
B .
ENDP
Default_Handler PROC
EXPORT WWDG_IRQHandler [WEAK]
EXPORT PVD_IRQHandler [WEAK]
EXPORT TAMPER_IRQHandler [WEAK]
EXPORT RTC_IRQHandler [WEAK]
EXPORT FLASH_IRQHandler [WEAK]
EXPORT RCC_IRQHandler [WEAK]
EXPORT EXTI0_IRQHandler [WEAK]
EXPORT EXTI1_IRQHandler [WEAK]
EXPORT EXTI2_IRQHandler [WEAK]
EXPORT EXTI3_IRQHandler [WEAK]
EXPORT EXTI4_IRQHandler [WEAK]
EXPORT DMA1_Channel1_IRQHandler [WEAK]
EXPORT DMA1_Channel2_IRQHandler [WEAK]
EXPORT DMA1_Channel3_IRQHandler [WEAK]
EXPORT DMA1_Channel4_IRQHandler [WEAK]
EXPORT DMA1_Channel5_IRQHandler [WEAK]
EXPORT DMA1_Channel6_IRQHandler [WEAK]
EXPORT DMA1_Channel7_IRQHandler [WEAK]
EXPORT ADC1_2_IRQHandler [WEAK]
EXPORT USB_HP_CAN1_TX_IRQHandler [WEAK]
EXPORT USB_LP_CAN1_RX0_IRQHandler [WEAK]
EXPORT CAN1_RX1_IRQHandler [WEAK]
EXPORT CAN1_SCE_IRQHandler [WEAK]
EXPORT EXTI9_5_IRQHandler [WEAK]
EXPORT TIM1_BRK_IRQHandler [WEAK]
EXPORT TIM1_UP_IRQHandler [WEAK]
EXPORT TIM1_TRG_COM_IRQHandler [WEAK]
EXPORT TIM1_CC_IRQHandler [WEAK]
EXPORT TIM2_IRQHandler [WEAK]
EXPORT TIM3_IRQHandler [WEAK]
EXPORT TIM4_IRQHandler [WEAK]
EXPORT I2C1_EV_IRQHandler [WEAK]
EXPORT I2C1_ER_IRQHandler [WEAK]
EXPORT I2C2_EV_IRQHandler [WEAK]
EXPORT I2C2_ER_IRQHandler [WEAK]
EXPORT SPI1_IRQHandler [WEAK]
EXPORT SPI2_IRQHandler [WEAK]
EXPORT USART1_IRQHandler [WEAK]
EXPORT USART2_IRQHandler [WEAK]
EXPORT USART3_IRQHandler [WEAK]
EXPORT EXTI15_10_IRQHandler [WEAK]
EXPORT RTCAlarm_IRQHandler [WEAK]
EXPORT USBWakeUp_IRQHandler [WEAK]
EXPORT TIM8_BRK_IRQHandler [WEAK]
EXPORT TIM8_UP_IRQHandler [WEAK]
EXPORT TIM8_TRG_COM_IRQHandler [WEAK]
EXPORT TIM8_CC_IRQHandler [WEAK]
EXPORT ADC3_IRQHandler [WEAK]
EXPORT FSMC_IRQHandler [WEAK]
EXPORT SDIO_IRQHandler [WEAK]
EXPORT TIM5_IRQHandler [WEAK]
EXPORT SPI3_IRQHandler [WEAK]
EXPORT UART4_IRQHandler [WEAK]
EXPORT UART5_IRQHandler [WEAK]
EXPORT TIM6_IRQHandler [WEAK]
EXPORT TIM7_IRQHandler [WEAK]
EXPORT DMA2_Channel1_IRQHandler [WEAK]
EXPORT DMA2_Channel2_IRQHandler [WEAK]
EXPORT DMA2_Channel3_IRQHandler [WEAK]
EXPORT DMA2_Channel4_5_IRQHandler [WEAK]
WWDG_IRQHandler
PVD_IRQHandler
TAMPER_IRQHandler
RTC_IRQHandler
FLASH_IRQHandler
RCC_IRQHandler
EXTI0_IRQHandler
EXTI1_IRQHandler
EXTI2_IRQHandler
EXTI3_IRQHandler
EXTI4_IRQHandler
DMA1_Channel1_IRQHandler
DMA1_Channel2_IRQHandler
DMA1_Channel3_IRQHandler
DMA1_Channel4_IRQHandler
DMA1_Channel5_IRQHandler
DMA1_Channel6_IRQHandler
DMA1_Channel7_IRQHandler
ADC1_2_IRQHandler
USB_HP_CAN1_TX_IRQHandler
USB_LP_CAN1_RX0_IRQHandler
CAN1_RX1_IRQHandler
CAN1_SCE_IRQHandler
EXTI9_5_IRQHandler
TIM1_BRK_IRQHandler
TIM1_UP_IRQHandler
TIM1_TRG_COM_IRQHandler
TIM1_CC_IRQHandler
TIM2_IRQHandler
TIM3_IRQHandler
TIM4_IRQHandler
I2C1_EV_IRQHandler
I2C1_ER_IRQHandler
I2C2_EV_IRQHandler
I2C2_ER_IRQHandler
SPI1_IRQHandler
SPI2_IRQHandler
USART1_IRQHandler
USART2_IRQHandler
USART3_IRQHandler
EXTI15_10_IRQHandler
RTCAlarm_IRQHandler
USBWakeUp_IRQHandler
TIM8_BRK_IRQHandler
TIM8_UP_IRQHandler
TIM8_TRG_COM_IRQHandler
TIM8_CC_IRQHandler
ADC3_IRQHandler
FSMC_IRQHandler
SDIO_IRQHandler
TIM5_IRQHandler
SPI3_IRQHandler
UART4_IRQHandler
UART5_IRQHandler
TIM6_IRQHandler
TIM7_IRQHandler
DMA2_Channel1_IRQHandler
DMA2_Channel2_IRQHandler
DMA2_Channel3_IRQHandler
DMA2_Channel4_5_IRQHandler
B .
ENDP
ALIGN ;填充字節使地址對齊
;*******************************************************************************
; User Stack and Heap initialization
;*******************************************************************************
;堆和棧的初始化
IF :DEF:__MICROLIB ;“DEF”的用法——:DEF:X 就是說X定義了則爲真,否則爲假
;如果定義了MICORLIB,
EXPORT __initial_sp ;則將棧頂地址,
EXPORT __heap_base ;堆起始地址賦予全局屬性,
EXPORT __heap_limit ;堆末端界限地址賦予全局屬性,使外部程序可調用
ELSE ;如果沒定義__MICROLIB,則使用默認的C運行時庫
IMPORT __use_two_region_memory ;;通知編譯器要使用的標號在其他文件__use_two_region_memory
EXPORT __user_initial_stackheap ;聲明全局標號__user_initial_stackheap,這樣外程序也可調用此標號
;則進行堆棧和堆的賦值,在__main函數執行過程中調用
;如果使用默認的C庫,程序啓動過程中就不會執行該標號下的代碼
__user_initial_stackheap ;標號__user_initial_stackheap,表示用戶堆棧初始化程序入口
;//則進行堆棧和堆的賦值,在__main函數執行過程中調用。
LDR R0, = Heap_Mem ;保存堆始地址
LDR R1, =(Stack_Mem + Stack_Size) ;保存棧的大小
LDR R2, = (Heap_Mem + Heap_Size) ;保存堆的大小
LDR R3, = Stack_Mem ;保存棧頂指針
BX LR
ALIGN ;填充字節使地址對齊
ENDIF
END
STM32啓動文件詳解
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