STM32 keil mdk启动代码发分析

妖狐艹你老母 2022-08-25 08:25 182阅读 0赞

学习STM32,看了一堆乱七八糟的文档，准备写程序了，先分析了下STM32的启动代码，看着这堆鬼鬼的汇编代码，挺吓人的，看看帮助，查查网路，还是不那么难懂。

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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

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