原创 STM32 keil mdk启动代码发分析

2011-7-19 21:57 3310 5 5 分类: MCU/ 嵌入式
  1. ;// <h> Stack Configuration   
  2. ;//   <o> Stack Size (in Bytes) <0x0-0xFFFFFFFF:8>   
  3. ;// </h>   
  4. Stack_Size      EQU     0x00000200                           ;//定义堆栈大小   
  5.                 AREA    STACK, NOINIT, READWRITE, ALIGN=3    ;//定义一个数据段 按8字节对齐   
  6. Stack_Mem       SPACE   Stack_Size                           ;//保留Stack_Size大小的堆栈空间   
  7. __initial_sp                                                 ;//标号,代表堆栈顶部地址,后面有用   
  8.   
  9. ;// <h> Heap Configuration   
  10. ;//   <o>  Heap Size (in Bytes) <0x0-0xFFFFFFFF:8>   
  11. ;// </h>   
  12. Heap_Size       EQU     0x00000020                            ;//定义堆空间大小   
  13.                 AREA    HEAP, NOINIT, READWRITE, ALIGN=3      ;//定义一个数据段,8字节对齐   
  14. __heap_base  
  15. Heap_Mem        SPACE   Heap_Size                             ;//保留Heap_Size的堆空间   
  16. __heap_limit                                                  ;//标号,代表堆末尾地址,后面有用   
  17.   
  18.                 PRESERVE8                                     ;//指示编译器8字节对齐   
  19.                 THUMB                                         ;//指示编译器为THUMB指令   
  20.   
  21. ; Vector Table Mapped to Address 0 at Reset  
  22.                 AREA    RESET, DATA, READONLY                  ;//定义只读数据段,其实放在CODE区,位于0地址   
  23.                   
  24.                 EXTERN  NMIException  
  25.                 EXTERN  HardFaultException  
  26.                 EXTERN  MemManageException  
  27.                 EXTERN  BusFaultException  
  28.                 EXTERN  UsageFaultException  
  29.                 EXTERN  SVCHandler  
  30.                 EXTERN  DebugMonitor  
  31.                 EXTERN  PendSVC  
  32.                 EXTERN  SysTickHandler                         ;//声明这些符号在外部定义,同C   
  33.                                                                ;//在××it.c中实现这些函数 ,中断就能自动调用了   
  34.                 EXPORT  __Vectors  
  35. __Vectors       DCD     __initial_sp              ; Top of Stack         //Cotex-M  要求此处为堆栈顶部地址   
  36.                 DCD     Reset_Handler             ; Reset Handler  
  37.                 DCD     NMIException              ; NMI Handler  
  38.                 DCD     HardFaultException        ; Hard Fault Handler  
  39.                 DCD     MemManageException        ; MPU Fault Handler  
  40.                 DCD     BusFaultException         ; Bus Fault Handler  
  41.                 DCD     UsageFaultException       ; Usage Fault Handler  
  42.                 DCD     0                         ; Reserved  
  43.                 DCD     0                         ; Reserved  
  44.                 DCD     0                         ; Reserved  
  45.                 DCD     0                         ; Reserved  
  46.                 DCD     SVCHandler                ; SVCall Handler  
  47.                 DCD     DebugMonitor              ; Debug Monitor Handler  
  48.                 DCD     0                         ; Reserved  
  49.                 DCD     PendSVC                   ; PendSV Handler  
  50.                 DCD     SysTickHandler            ; SysTick Handler      //一大堆的异常处理函数地址   
  51.                 ; External Interrupts  
  52.                 EXTERN  WWDG_IRQHandler  
  53.                 EXTERN  PVD_IRQHandler  
  54.                 EXTERN  TAMPER_IRQHandler  
  55.                 EXTERN  RTC_IRQHandler  
  56.                 EXTERN  FLASH_IRQHandler  
  57.                 EXTERN  RCC_IRQHandler  
  58.                 EXTERN  EXTI0_IRQHandler  
  59.                 EXTERN  EXTI1_IRQHandler  
  60.                 EXTERN  EXTI2_IRQHandler  
  61.                 EXTERN  EXTI3_IRQHandler  
  62.                 EXTERN  EXTI4_IRQHandler  
  63.                 EXTERN  DMAChannel1_IRQHandler  
  64.                 EXTERN  DMAChannel2_IRQHandler  
  65.                 EXTERN  DMAChannel3_IRQHandler  
  66.                 EXTERN  DMAChannel4_IRQHandler  
  67.                 EXTERN  DMAChannel5_IRQHandler  
  68.                 EXTERN  DMAChannel6_IRQHandler  
  69.                 EXTERN  DMAChannel7_IRQHandler  
  70.                 EXTERN  ADC_IRQHandler  
  71.                 EXTERN  USB_HP_CAN_TX_IRQHandler  
  72.                 EXTERN  USB_LP_CAN_RX0_IRQHandler  
  73.                 EXTERN  CAN_RX1_IRQHandler  
  74.                 EXTERN  CAN_SCE_IRQHandler  
  75.                 EXTERN  EXTI9_5_IRQHandler  
  76.                 EXTERN  TIM1_BRK_IRQHandler  
  77.                 EXTERN  TIM1_UP_IRQHandler  
  78.                 EXTERN  TIM1_TRG_COM_IRQHandler  
  79.                 EXTERN  TIM1_CC_IRQHandler  
  80.                 EXTERN  TIM2_IRQHandler  
  81.                 EXTERN  TIM3_IRQHandler  
  82.                 EXTERN  TIM4_IRQHandler  
  83.                 EXTERN  I2C1_EV_IRQHandler  
  84.                 EXTERN  I2C1_ER_IRQHandler  
  85.                 EXTERN  I2C2_EV_IRQHandler  
  86.                 EXTERN  I2C2_ER_IRQHandler  
  87.                 EXTERN  SPI1_IRQHandler  
  88.                 EXTERN  SPI2_IRQHandler  
  89.                 EXTERN  USART1_IRQHandler  
  90.                 EXTERN  USART2_IRQHandler  
  91.                 EXTERN  USART3_IRQHandler  
  92.                 EXTERN  EXTI15_10_IRQHandler  
  93.                 EXTERN  RTCAlarm_IRQHandler  
  94.                 EXTERN  USBWakeUp_IRQHandler                    ;//同上,   
  95.                   
  96.                 DCD     WWDG_IRQHandler           ; Window Watchdog  
  97.                 DCD     PVD_IRQHandler            ; PVD through EXTI Line detect  
  98.                 DCD     TAMPER_IRQHandler         ; Tamper  
  99.                 DCD     RTC_IRQHandler            ; RTC  
  100.                 DCD     FLASH_IRQHandler          ; Flash  
  101.                 DCD     RCC_IRQHandler            ; RCC  
  102.                 DCD     EXTI0_IRQHandler          ; EXTI Line 0  
  103.                 DCD     EXTI1_IRQHandler          ; EXTI Line 1  
  104.                 DCD     EXTI2_IRQHandler          ; EXTI Line 2  
  105.                 DCD     EXTI3_IRQHandler          ; EXTI Line 3  
  106.                 DCD     EXTI4_IRQHandler          ; EXTI Line 4  
  107.                 DCD     DMAChannel1_IRQHandler    ; DMA Channel 1  
  108.                 DCD     DMAChannel2_IRQHandler    ; DMA Channel 2  
  109.                 DCD     DMAChannel3_IRQHandler    ; DMA Channel 3  
  110.                 DCD     DMAChannel4_IRQHandler    ; DMA Channel 4  
  111.                 DCD     DMAChannel5_IRQHandler    ; DMA Channel 5  
  112.                 DCD     DMAChannel6_IRQHandler    ; DMA Channel 6  
  113.                 DCD     DMAChannel7_IRQHandler    ; DMA Channel 7  
  114.                 DCD     ADC_IRQHandler            ; ADC  
  115.                 DCD     USB_HP_CAN_TX_IRQHandler  ; USB High Priority or CAN TX  
  116.                 DCD     USB_LP_CAN_RX0_IRQHandler ; USB Low  Priority or CAN RX0  
  117.                 DCD     CAN_RX1_IRQHandler        ; CAN RX1  
  118.                 DCD     CAN_SCE_IRQHandler        ; CAN SCE  
  119.                 DCD     EXTI9_5_IRQHandler        ; EXTI Line 9..5  
  120.                 DCD     TIM1_BRK_IRQHandler       ; TIM1 Break  
  121.                 DCD     TIM1_UP_IRQHandler        ; TIM1 Update  
  122.                 DCD     TIM1_TRG_COM_IRQHandler   ; TIM1 Trigger and Commutation  
  123.                 DCD     TIM1_CC_IRQHandler        ; TIM1 Capture Compare  
  124.                 DCD     TIM2_IRQHandler           ; TIM2  
  125.                 DCD     TIM3_IRQHandler           ; TIM3  
  126.                 DCD     TIM4_IRQHandler           ; TIM4  
  127.                 DCD     I2C1_EV_IRQHandler        ; I2C1 Event  
  128.                 DCD     I2C1_ER_IRQHandler        ; I2C1 Error  
  129.                 DCD     I2C2_EV_IRQHandler        ; I2C2 Event  
  130.                 DCD     I2C2_ER_IRQHandler        ; I2C2 Error  
  131.                 DCD     SPI1_IRQHandler           ; SPI1  
  132.                 DCD     SPI2_IRQHandler           ; SPI2  
  133.                 DCD     USART1_IRQHandler         ; USART1  
  134.                 DCD     USART2_IRQHandler         ; USART2  
  135.                 DCD     USART3_IRQHandler         ; USART3  
  136.                 DCD     EXTI15_10_IRQHandler      ; EXTI Line 15..10  
  137.                 DCD     RTCAlarm_IRQHandler       ; RTC Alarm through EXTI Line  
  138.                 DCD     USBWakeUp_IRQHandler      ; USB Wakeup from suspend   ;//同上   
  139.   
  140.                 AREA    |.text|, CODE, READONLY        ;//定义代码段   
  141.   
  142. ; Reset Handler  
  143. Reset_Handler   PROC                                        ;//Rset_Handler的实现   
  144.                 EXPORT  Reset_Handler             [WEAK]    ;//在外部没有定义该符号时导出该符号,见HELP中[WEAK]   
  145.                 IMPORT  __main                              ;//导入符号,__main为 运行时库提供的函数;完成堆栈,堆的初始话   
  146.                 LDR     R0, =__main                         ;//等工作,会调用下面定义的__user_initial_stackheap;   
  147.                 BX      R0                                  ;//跳到__main,进入C的世界   
  148.                 ENDP  
  149.   
  150.                 ALIGN  
  151.   
  152. ; User Initial Stack & Heap  
  153.                 IF      :DEF:__MICROLIB                     ;//如果使用micro lib,micro lib 描述见armlib.chm   
  154.                   
  155.                 EXPORT  __initial_sp  
  156.                 EXPORT  __heap_base  
  157.                 EXPORT  __heap_limit                        ;//只导出几个定义   
  158.                   
  159.                 ELSE                                        ;//如果使用默认C运行时库   
  160.                   
  161.                 IMPORT  __use_two_region_memory  
  162.                 EXPORT  __user_initial_stackheap  
  163. __user_initial_stackheap                                    ;//则进行堆栈和堆的赋值,在__main函数执行过程中调用。   
  164.                 LDR     R0, =  Heap_Mem  
  165.                 LDR     R1, =(Stack_Mem + Stack_Size)  
  166.                 LDR     R2, = (Heap_Mem +  Heap_Size)  
  167.                 LDR     R3, = Stack_Mem  
  168.                 BX      LR  
  169.                 ALIGN  
  170.                 ENDIF  
  171.   
  172.                 END                                         ;//OK ,完了  
PARTNER CONTENT

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