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  • (转)CortexM3 (NXP LPC1788)之启动代码分析

    在Keil uVision4中新建一个基于NXP1788的工程后，会提示添加启动汇编代码startup_LPC177x_8x.S。该文件进行从汇编到C语言运行环境的初始化工作。

    [cpp]
    1. ;/*****************************************************************************
    2. ; * @file:    startup_LPC177x_8x.s
    3. ; * @purpose: CMSIS Cortex-M3 Core Device Startup File
    4. ; *           for the NXP LPC177x_8x Device Series
    5. ; * @version: V1.20
    6. ; * @date:    07. October 2010
    7. ; *------- <<< Use Configuration Wizard in Context Menu >>> ------------------
    8. ; *
    9. ; * Copyright (C) 2010 ARM Limited. All rights reserved.
    10. ; * ARM Limited (ARM) is supplying this software for use with Cortex-M3
    11. ; * processor based microcontrollers.  This file can be freely distributed
    12. ; * within development tools that are supporting such ARM based processors.
    13. ; *
    14. ; * THIS SOFTWARE IS PROVIDED "AS IS".  NO WARRANTIES, WHETHER EXPRESS, IMPLIED
    15. ; * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
    16. ; * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
    17. ; * ARM SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR
    18. ; * CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
    19. ; *
    20. ; *****************************************************************************/ 
    21.  
    22.  
    23. ; <h> Stack Configuration 
    24. ;   <o> Stack Size (in Bytes) <0x0-0xFFFFFFFF:8> 
    25. ; </h> 
    26.  
    27. Stack_Size      EQU     0x00000200 
    28.  
    29.                 AREA    STACK, NOINIT, READWRITE, ALIGN=3 
    30. Stack_Mem       SPACE   Stack_Size 
    31. __initial_sp 
    32.  
    33.  
    34. ; <h> Heap Configuration 
    35. ;   <o>  Heap Size (in Bytes) <0x0-0xFFFFFFFF:8> 
    36. ; </h> 
    37.  
    38. Heap_Size       EQU     0x00000400 
    39.  
    40.                 AREA    HEAP, NOINIT, READWRITE, ALIGN=3 
    41. __heap_base 
    42. Heap_Mem        SPACE   Heap_Size 
    43. __heap_limit 
    44.  
    45.  
    46.                 PRESERVE8 
    47.                 THUMB 
    48.  
    49.  
    50. ; Vector Table Mapped to Address 0 at Reset 
    51.  
    52.                 AREA    RESET, DATA, READONLY 
    53.                 EXPORT  __Vectors 
    54.  
    55. __Vectors       DCD     __initial_sp              ; Top of Stack 
    56.                 DCD     Reset_Handler             ; Reset Handler 
    57.                 DCD     NMI_Handler               ; NMI Handler 
    58.                 DCD     HardFault_Handler         ; Hard Fault Handler 
    59.                 DCD     MemManage_Handler         ; MPU Fault Handler 
    60.                 DCD     BusFault_Handler          ; Bus Fault Handler 
    61.                 DCD     UsageFault_Handler        ; Usage Fault Handler 
    62.                 DCD     0                         ; Reserved 
    63.                 DCD     0                         ; Reserved 
    64.                 DCD     0                         ; Reserved 
    65.                 DCD     0                         ; Reserved 
    66.                 DCD     SVC_Handler               ; SVCall Handler 
    67.                 DCD     DebugMon_Handler          ; Debug Monitor Handler 
    68.                 DCD     0                         ; Reserved 
    69.                 DCD     PendSV_Handler            ; PendSV Handler 
    70.                 DCD     SysTick_Handler           ; SysTick Handler 
    71.  
    72.                 ; External Interrupts 
    73.                 DCD     WDT_IRQHandler            ; 16: Watchdog Timer 
    74.                 DCD     TIMER0_IRQHandler         ; 17: Timer0 
    75.                 DCD     TIMER1_IRQHandler         ; 18: Timer1 
    76.                 DCD     TIMER2_IRQHandler         ; 19: Timer2 
    77.                 DCD     TIMER3_IRQHandler         ; 20: Timer3 
    78.                 DCD     UART0_IRQHandler          ; 21: UART0 
    79.                 DCD     UART1_IRQHandler          ; 22: UART1 
    80.                 DCD     UART2_IRQHandler          ; 23: UART2 
    81.                 DCD     UART3_IRQHandler          ; 24: UART3 
    82.                 DCD     PWM1_IRQHandler           ; 25: PWM1 
    83.                 DCD     I2C0_IRQHandler           ; 26: I2C0 
    84.                 DCD     I2C1_IRQHandler           ; 27: I2C1 
    85.                 DCD     I2C2_IRQHandler           ; 28: I2C2 
    86.                 DCD     SPIFI_IRQHandler          ; 29: SPIFI 
    87.                 DCD     SSP0_IRQHandler           ; 30: SSP0 
    88.                 DCD     SSP1_IRQHandler           ; 31: SSP1 
    89.                 DCD     PLL0_IRQHandler           ; 32: PLL0 Lock (Main PLL) 
    90.                 DCD     RTC_IRQHandler            ; 33: Real Time Clock 
    91.                 DCD     EINT0_IRQHandler          ; 34: External Interrupt 0 
    92.                 DCD     EINT1_IRQHandler          ; 35: External Interrupt 1 
    93.                 DCD     EINT2_IRQHandler          ; 36: External Interrupt 2 
    94.                 DCD     EINT3_IRQHandler          ; 37: External Interrupt 3 
    95.                 DCD     ADC_IRQHandler            ; 38: A/D Converter 
    96.                 DCD     BOD_IRQHandler            ; 39: Brown-Out Detect 
    97.                 DCD     USB_IRQHandler            ; 40: USB 
    98.                 DCD     CAN_IRQHandler            ; 41: CAN 
    99.                 DCD     DMA_IRQHandler            ; 42: General Purpose DMA 
    100.                 DCD     I2S_IRQHandler            ; 43: I2S 
    101.                 DCD     ENET_IRQHandler           ; 44: Ethernet 
    102.                 DCD     MCI_IRQHandler            ; 45: SD/MMC card I/F 
    103.                 DCD     MCPWM_IRQHandler          ; 46: Motor Control PWM 
    104.                 DCD     QEI_IRQHandler            ; 47: Quadrature Encoder Interface 
    105.                 DCD     PLL1_IRQHandler           ; 48: PLL1 Lock (USB PLL) 
    106.                 DCD     USBActivity_IRQHandler    ; 49: USB Activity interrupt to wakeup 
    107.                 DCD     CANActivity_IRQHandler    ; 50: CAN Activity interrupt to wakeup 
    108.                 DCD     UART4_IRQHandler          ; 51: UART4 
    109.                 DCD     SSP2_IRQHandler           ; 52: SSP2 
    110.                 DCD     LCD_IRQHandler            ; 53: LCD 
    111.                 DCD     GPIO_IRQHandler           ; 54: GPIO 
    112.                 DCD     PWM0_IRQHandler           ; 55: PWM0 
    113.                 DCD     EEPROM_IRQHandler         ; 56: EEPROM 
    114.  
    115.  
    116.                 IF      :LNOT::DEF:NO_CRP 
    117.                 AREA    |.ARM.__at_0x02FC|, CODE, READONLY 
    118. CRP_Key         DCD     0xFFFFFFFF 
    119.                 ENDIF 
    120.  
    121.  
    122.                 AREA    |.text|, CODE, READONLY 
    123.  
    124.  
    125. ; Reset Handler 
    126.  
    127. Reset_Handler   PROC 
    128.                 EXPORT  Reset_Handler             [WEAK] 
    129.                 IMPORT  SystemInit 
    130.                 IMPORT  __main 
    131.                 LDR     R0, =SystemInit 
    132.                 BLX     R0 
    133.                 LDR     R0, =__main 
    134.                 BX      R0 
    135.                 ENDP 
    136.  
    137.  
    138. ; Dummy Exception Handlers (infinite loops which can be modified) 
    139.  
    140. NMI_Handler     PROC 
    141.                 EXPORT  NMI_Handler               [WEAK] 
    142.                 B       . 
    143.                 ENDP 
    144. HardFault_Handler\ 
    145.                 PROC 
    146.                 EXPORT  HardFault_Handler         [WEAK] 
    147.                 B       . 
    148.                 ENDP 
    149. MemManage_Handler\ 
    150.                 PROC 
    151.                 EXPORT  MemManage_Handler         [WEAK] 
    152.                 B       . 
    153.                 ENDP 
    154. BusFault_Handler\ 
    155.                 PROC 
    156.                 EXPORT  BusFault_Handler          [WEAK] 
    157.                 B       . 
    158.                 ENDP 
    159. UsageFault_Handler\ 
    160.                 PROC 
    161.                 EXPORT  UsageFault_Handler        [WEAK] 
    162.                 B       . 
    163.                 ENDP 
    164. SVC_Handler     PROC 
    165.                 EXPORT  SVC_Handler               [WEAK] 
    166.                 B       . 
    167.                 ENDP 
    168. DebugMon_Handler\ 
    169.                 PROC 
    170.                 EXPORT  DebugMon_Handler          [WEAK] 
    171.                 B       . 
    172.                 ENDP 
    173. PendSV_Handler  PROC 
    174.                 EXPORT  PendSV_Handler            [WEAK] 
    175.                 B       . 
    176.                 ENDP 
    177. SysTick_Handler PROC 
    178.                 EXPORT  SysTick_Handler           [WEAK] 
    179.                 B       . 
    180.                 ENDP 
    181.  
    182. Default_Handler PROC 
    183.  
    184.                 EXPORT  WDT_IRQHandler            [WEAK] 
    185.                 EXPORT  TIMER0_IRQHandler         [WEAK] 
    186.                 EXPORT  TIMER1_IRQHandler         [WEAK] 
    187.                 EXPORT  TIMER2_IRQHandler         [WEAK] 
    188.                 EXPORT  TIMER3_IRQHandler         [WEAK] 
    189.                 EXPORT  UART0_IRQHandler          [WEAK] 
    190.                 EXPORT  UART1_IRQHandler          [WEAK] 
    191.                 EXPORT  UART2_IRQHandler          [WEAK] 
    192.                 EXPORT  UART3_IRQHandler          [WEAK] 
    193.                 EXPORT  PWM1_IRQHandler           [WEAK] 
    194.                 EXPORT  I2C0_IRQHandler           [WEAK] 
    195.                 EXPORT  I2C1_IRQHandler           [WEAK] 
    196.                 EXPORT  I2C2_IRQHandler           [WEAK] 
    197.                 EXPORT  SPIFI_IRQHandler          [WEAK] 
    198.                 EXPORT  SSP0_IRQHandler           [WEAK] 
    199.                 EXPORT  SSP1_IRQHandler           [WEAK] 
    200.                 EXPORT  PLL0_IRQHandler           [WEAK] 
    201.                 EXPORT  RTC_IRQHandler            [WEAK] 
    202.                 EXPORT  EINT0_IRQHandler          [WEAK] 
    203.                 EXPORT  EINT1_IRQHandler          [WEAK] 
    204.                 EXPORT  EINT2_IRQHandler          [WEAK] 
    205.                 EXPORT  EINT3_IRQHandler          [WEAK] 
    206.                 EXPORT  ADC_IRQHandler            [WEAK] 
    207.                 EXPORT  BOD_IRQHandler            [WEAK] 
    208.                 EXPORT  USB_IRQHandler            [WEAK] 
    209.                 EXPORT  CAN_IRQHandler            [WEAK] 
    210.                 EXPORT  DMA_IRQHandler            [WEAK] 
    211.                 EXPORT  I2S_IRQHandler            [WEAK] 
    212.                 EXPORT  ENET_IRQHandler           [WEAK] 
    213.                 EXPORT  MCI_IRQHandler            [WEAK] 
    214.                 EXPORT  MCPWM_IRQHandler          [WEAK] 
    215.                 EXPORT  QEI_IRQHandler            [WEAK] 
    216.                 EXPORT  PLL1_IRQHandler           [WEAK] 
    217.                 EXPORT  USBActivity_IRQHandler    [WEAK] 
    218.                 EXPORT  CANActivity_IRQHandler    [WEAK] 
    219.                 EXPORT  UART4_IRQHandler          [WEAK] 
    220.                 EXPORT  SSP2_IRQHandler           [WEAK] 
    221.                 EXPORT  LCD_IRQHandler            [WEAK] 
    222.                 EXPORT  GPIO_IRQHandler           [WEAK] 
    223.                 EXPORT  PWM0_IRQHandler           [WEAK] 
    224.                 EXPORT  EEPROM_IRQHandler         [WEAK] 
    225.  
    226. WDT_IRQHandler 
    227. TIMER0_IRQHandler 
    228. TIMER1_IRQHandler 
    229. TIMER2_IRQHandler 
    230. TIMER3_IRQHandler 
    231. UART0_IRQHandler 
    232. UART1_IRQHandler 
    233. UART2_IRQHandler 
    234. UART3_IRQHandler 
    235. PWM1_IRQHandler 
    236. I2C0_IRQHandler 
    237. I2C1_IRQHandler 
    238. I2C2_IRQHandler 
    239. SPIFI_IRQHandler             
    240. SSP0_IRQHandler 
    241. SSP1_IRQHandler 
    242. PLL0_IRQHandler 
    243. RTC_IRQHandler 
    244. EINT0_IRQHandler 
    245. EINT1_IRQHandler 
    246. EINT2_IRQHandler 
    247. EINT3_IRQHandler 
    248. ADC_IRQHandler 
    249. BOD_IRQHandler 
    250. USB_IRQHandler 
    251. CAN_IRQHandler 
    252. DMA_IRQHandler 
    253. I2S_IRQHandler 
    254. ENET_IRQHandler 
    255. MCI_IRQHandler           
    256. MCPWM_IRQHandler 
    257. QEI_IRQHandler 
    258. PLL1_IRQHandler 
    259. USBActivity_IRQHandler 
    260. CANActivity_IRQHandler 
    261. UART4_IRQHandler 
    262. SSP2_IRQHandler 
    263. LCD_IRQHandler 
    264. GPIO_IRQHandler 
    265. PWM0_IRQHandler 
    266. EEPROM_IRQHandler 
    267.  
    268.                 B       . 
    269.  
    270.                 ENDP 
    271.  
    272.  
    273.                 ALIGN 
    274.  
    275.  
    276. ; User Initial Stack & Heap 
    277.  
    278.                 IF      :DEF:__MICROLIB 
    279.  
    280.                 EXPORT  __initial_sp 
    281.                 EXPORT  __heap_base 
    282.                 EXPORT  __heap_limit 
    283.  
    284.                 ELSE 
    285.  
    286.                 IMPORT  __use_two_region_memory 
    287.                 EXPORT  __user_initial_stackheap 
    288. __user_initial_stackheap 
    289.  
    290.                 LDR     R0, =  Heap_Mem 
    291.                 LDR     R1, =(Stack_Mem + Stack_Size) 
    292.                 LDR     R2, = (Heap_Mem +  Heap_Size) 
    293.                 LDR     R3, = Stack_Mem 
    294.                 BX      LR 
    295.  
    296.                 ALIGN 
    297.  
    298.                 ENDIF 
    299.  
    300.  
    301.                 END  
    ;/*****************************************************************************
; * @file:    startup_LPC177x_8x.s
; * @purpose: CMSIS Cortex-M3 Core Device Startup File
; *           for the NXP LPC177x_8x Device Series 
; * @version: V1.20
; * @date:    07. October 2010
; *------- <<< Use Configuration Wizard in Context Menu >>> ------------------
; *
; * Copyright (C) 2010 ARM Limited. All rights reserved.
; * ARM Limited (ARM) is supplying this software for use with Cortex-M3
; * processor based microcontrollers.  This file can be freely distributed
; * within development tools that are supporting such ARM based processors.
; *
; * THIS SOFTWARE IS PROVIDED "AS IS".  NO WARRANTIES, WHETHER EXPRESS, IMPLIED
; * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
; * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
; * ARM SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR
; * CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
; *
; *****************************************************************************/


; <h> Stack Configuration
;   <o> Stack Size (in Bytes) <0x0-0xFFFFFFFF:8>
; </h>

Stack_Size      EQU     0x00000200

                AREA    STACK, NOINIT, READWRITE, ALIGN=3
Stack_Mem       SPACE   Stack_Size
__initial_sp


; <h> Heap Configuration
;   <o>  Heap Size (in Bytes) <0x0-0xFFFFFFFF:8>
; </h>

Heap_Size       EQU     0x00000400

                AREA    HEAP, NOINIT, READWRITE, ALIGN=3
__heap_base
Heap_Mem        SPACE   Heap_Size
__heap_limit


                PRESERVE8
                THUMB


; Vector Table Mapped to Address 0 at Reset

                AREA    RESET, DATA, READONLY
                EXPORT  __Vectors

__Vectors       DCD     __initial_sp              ; Top of Stack
                DCD     Reset_Handler             ; Reset Handler
                DCD     NMI_Handler               ; NMI Handler
                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
                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     WDT_IRQHandler            ; 16: Watchdog Timer
                DCD     TIMER0_IRQHandler         ; 17: Timer0
                DCD     TIMER1_IRQHandler         ; 18: Timer1
                DCD     TIMER2_IRQHandler         ; 19: Timer2
                DCD     TIMER3_IRQHandler         ; 20: Timer3
                DCD     UART0_IRQHandler          ; 21: UART0
                DCD     UART1_IRQHandler          ; 22: UART1
                DCD     UART2_IRQHandler          ; 23: UART2
                DCD     UART3_IRQHandler          ; 24: UART3
                DCD     PWM1_IRQHandler           ; 25: PWM1
                DCD     I2C0_IRQHandler           ; 26: I2C0
                DCD     I2C1_IRQHandler           ; 27: I2C1
                DCD     I2C2_IRQHandler           ; 28: I2C2
                DCD     SPIFI_IRQHandler          ; 29: SPIFI
                DCD     SSP0_IRQHandler           ; 30: SSP0
                DCD     SSP1_IRQHandler           ; 31: SSP1
                DCD     PLL0_IRQHandler           ; 32: PLL0 Lock (Main PLL)
                DCD     RTC_IRQHandler            ; 33: Real Time Clock
                DCD     EINT0_IRQHandler          ; 34: External Interrupt 0
                DCD     EINT1_IRQHandler          ; 35: External Interrupt 1
                DCD     EINT2_IRQHandler          ; 36: External Interrupt 2
                DCD     EINT3_IRQHandler          ; 37: External Interrupt 3
                DCD     ADC_IRQHandler            ; 38: A/D Converter
                DCD     BOD_IRQHandler            ; 39: Brown-Out Detect
                DCD     USB_IRQHandler            ; 40: USB
                DCD     CAN_IRQHandler            ; 41: CAN
                DCD     DMA_IRQHandler            ; 42: General Purpose DMA
                DCD     I2S_IRQHandler            ; 43: I2S
                DCD     ENET_IRQHandler           ; 44: Ethernet
                DCD     MCI_IRQHandler            ; 45: SD/MMC card I/F
                DCD     MCPWM_IRQHandler          ; 46: Motor Control PWM
                DCD     QEI_IRQHandler            ; 47: Quadrature Encoder Interface
                DCD     PLL1_IRQHandler           ; 48: PLL1 Lock (USB PLL)
				DCD		USBActivity_IRQHandler    ; 49: USB Activity interrupt to wakeup
				DCD		CANActivity_IRQHandler    ; 50: CAN Activity interrupt to wakeup
				DCD		UART4_IRQHandler          ; 51: UART4
				DCD		SSP2_IRQHandler           ; 52: SSP2
				DCD		LCD_IRQHandler            ; 53: LCD
				DCD		GPIO_IRQHandler           ; 54: GPIO
				DCD		PWM0_IRQHandler           ; 55: PWM0
				DCD		EEPROM_IRQHandler         ; 56: EEPROM


                IF      :LNOT::DEF:NO_CRP
                AREA    |.ARM.__at_0x02FC|, CODE, READONLY
CRP_Key         DCD     0xFFFFFFFF
                ENDIF


                AREA    |.text|, CODE, READONLY


; Reset Handler

Reset_Handler   PROC
                EXPORT  Reset_Handler             [WEAK]
				IMPORT  SystemInit
                IMPORT  __main
				LDR     R0, =SystemInit
                BLX     R0
                LDR     R0, =__main
                BX      R0
                ENDP


; Dummy Exception Handlers (infinite loops which can be modified)

NMI_Handler     PROC
                EXPORT  NMI_Handler               [WEAK]
                B       .
                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  WDT_IRQHandler            [WEAK]
                EXPORT  TIMER0_IRQHandler         [WEAK]
                EXPORT  TIMER1_IRQHandler         [WEAK]
                EXPORT  TIMER2_IRQHandler         [WEAK]
                EXPORT  TIMER3_IRQHandler         [WEAK]
                EXPORT  UART0_IRQHandler          [WEAK]
                EXPORT  UART1_IRQHandler          [WEAK]
                EXPORT  UART2_IRQHandler          [WEAK]
                EXPORT  UART3_IRQHandler          [WEAK]
                EXPORT  PWM1_IRQHandler           [WEAK]
                EXPORT  I2C0_IRQHandler           [WEAK]
                EXPORT  I2C1_IRQHandler           [WEAK]
                EXPORT  I2C2_IRQHandler           [WEAK]
                EXPORT  SPIFI_IRQHandler          [WEAK]
                EXPORT  SSP0_IRQHandler           [WEAK]
                EXPORT  SSP1_IRQHandler           [WEAK]
                EXPORT  PLL0_IRQHandler           [WEAK]
                EXPORT  RTC_IRQHandler            [WEAK]
                EXPORT  EINT0_IRQHandler          [WEAK]
                EXPORT  EINT1_IRQHandler          [WEAK]
                EXPORT  EINT2_IRQHandler          [WEAK]
                EXPORT  EINT3_IRQHandler          [WEAK]
                EXPORT  ADC_IRQHandler            [WEAK]
                EXPORT  BOD_IRQHandler            [WEAK]
                EXPORT  USB_IRQHandler            [WEAK]
                EXPORT  CAN_IRQHandler            [WEAK]
                EXPORT  DMA_IRQHandler            [WEAK]
                EXPORT  I2S_IRQHandler            [WEAK]
                EXPORT  ENET_IRQHandler           [WEAK]
                EXPORT  MCI_IRQHandler            [WEAK]
                EXPORT  MCPWM_IRQHandler          [WEAK]
                EXPORT  QEI_IRQHandler            [WEAK]
                EXPORT  PLL1_IRQHandler           [WEAK]
				EXPORT  USBActivity_IRQHandler    [WEAK]
				EXPORT  CANActivity_IRQHandler    [WEAK]
				EXPORT  UART4_IRQHandler          [WEAK]
				EXPORT  SSP2_IRQHandler           [WEAK]
				EXPORT  LCD_IRQHandler            [WEAK]
				EXPORT  GPIO_IRQHandler           [WEAK]
				EXPORT  PWM0_IRQHandler           [WEAK]
				EXPORT  EEPROM_IRQHandler         [WEAK]

WDT_IRQHandler
TIMER0_IRQHandler
TIMER1_IRQHandler
TIMER2_IRQHandler
TIMER3_IRQHandler
UART0_IRQHandler
UART1_IRQHandler
UART2_IRQHandler
UART3_IRQHandler
PWM1_IRQHandler
I2C0_IRQHandler
I2C1_IRQHandler
I2C2_IRQHandler
SPIFI_IRQHandler            
SSP0_IRQHandler
SSP1_IRQHandler
PLL0_IRQHandler
RTC_IRQHandler
EINT0_IRQHandler
EINT1_IRQHandler
EINT2_IRQHandler
EINT3_IRQHandler
ADC_IRQHandler
BOD_IRQHandler
USB_IRQHandler
CAN_IRQHandler
DMA_IRQHandler
I2S_IRQHandler
ENET_IRQHandler
MCI_IRQHandler          
MCPWM_IRQHandler
QEI_IRQHandler
PLL1_IRQHandler
USBActivity_IRQHandler
CANActivity_IRQHandler
UART4_IRQHandler
SSP2_IRQHandler
LCD_IRQHandler
GPIO_IRQHandler
PWM0_IRQHandler
EEPROM_IRQHandler

                B       .

                ENDP


                ALIGN


; User Initial Stack & Heap

                IF      :DEF:__MICROLIB

                EXPORT  __initial_sp
                EXPORT  __heap_base
                EXPORT  __heap_limit

                ELSE

                IMPORT  __use_two_region_memory
                EXPORT  __user_initial_stackheap
__user_initial_stackheap

                LDR     R0, =  Heap_Mem
                LDR     R1, =(Stack_Mem + Stack_Size)
                LDR     R2, = (Heap_Mem +  Heap_Size)
                LDR     R3, = Stack_Mem
                BX      LR

                ALIGN

                ENDIF


                END

    程序完成如下内容的工作：

            开辟一块大小为Stack_Size的栈空间；

            标号__initial_sp指向栈顶位置；

            定义堆空间大小为Heap_Size；

            建立中断向量表Vectors，cortex-M3规定起始地址必须存放栈顶地址即__initial_sp，紧接着存放复位入口地址，这样内核复位后就会自动从起始地址的下32位取出复位地址执行复位中断服务函数。

            Reset_Handler复位中断函数中先EXPORT声明Reset_Handler的全局性，然后分别执行外部的函数SystemInit和__main。

    下面对汇编程序中的几个关键字做说明：

            AREA伪指令：用于定义代码段和数据段，后跟属性标号。其中“READWRITE”表示可读写，“READONLY”只读属性。根据LPC1788的数据手册描述的存储介质，可知可读写段保持在SRAM区，起始地址为0x1000 0000，代码中的堆栈保存在SRAM空间。只读段保存在Flash区，起始地址为0x0000 0000，代码中的中断向量表保存在Flash空间。 因此可以总结出，在0x0000 0000 存放的是栈顶的地址__initial_sp（即0x1000 0200），在0x0000 0004 存放的是Reset_Handler的地址。

    LPCaddresS

    图1：LPC1788 地址映射

    memoryLPC

    图2： debug中 0地址的值0x1000 0200 即栈顶地址， 0x0000 0004 地址值为0x0000 00F9（看反汇编可知该值 即Reset_Handler的入口如下图）。

    0XF9

            DCD指令：开辟内存空间，中断向量表建立中使用相当于C语言中的函数指针，每个成员都是函数指针，指向各个中断服务函数。

            自此分析了LPC1788的启动，主要包括堆栈初始化，和中断向量表的初始化。LPC1788有内部Flash，所以上点从内部Flash启动，内部Flash的起始地址为0x0000 0000，存放栈顶的地址0x1000 0200。 0x0000 0004存放复位中断的入口地址。LPC1788复位后，从0x0000 0004取出复位入口地址，执行中断复位函数，从而跳转到SystemInit和main C语言函数执行。
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  • 原文地址：https://www.cnblogs.com/tdyizhen1314/p/2703307.html
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