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发表于 2012-2-27 22:58:24
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回复【317楼】wazhiyi
mark，讲的很深入，能不能分析一下cm3的启动文件。
;***************************************************************************************
; amount of memory (in bytes) allocated for stack and heap
; tailor those values to your application needs
;***************************************************************************************
stack_size equ 0x200
heap_size equ 0x200
;***************......
-----------------------------------------------------------------------
看完这个帖子，分析下这个启动文件，理解如有错误，请指正，谢谢！
;***************************************************************************************
; Amount of memory (in bytes) allocated for Stack and Heap
; Tailor those values to your application needs
;***************************************************************************************
Stack_Size EQU 0x200 ;设置Stack_Size的大小为0x200
Heap_Size EQU 0x200 ;设置Heap_Size的大小为0x200
;*******************************************************************************
; Allocate space for the Stack
;*******************************************************************************
AREA STACK, NOINIT, READWRITE, ALIGN=3 ;段名STACK，属性可读写
Stack
SPACE Stack_Size ;为Stack分配Stack_Size大小的内存空间，并且Stack指向内存的开始
;*******************************************************************************
; Allocate space for the Heap
;*******************************************************************************
AREA HEAP, NOINIT, READWRITE, ALIGN=3
Heap
SPACE Heap_Size ;为Heap分配Heap_Size大小的内存空间，并且Heap指向内存的开始
;********************************************************************************
;* Declarations for the interrupt handlers that are used by the application.
;********************************************************************************
IMPORT __main ;声明__main，内部可用
IMPORT OSPendSV ;声明OSPendSV，内部可用
IMPORT SysTickHandler;下同
IMPORT WWDG_IRQHandler
IMPORT PVD_IRQHandler
IMPORT TAMPER_IRQHandler
IMPORT RTC_IRQHandler
IMPORT FLASH_IRQHandler
IMPORT RCC_IRQHandler
IMPORT EXTI0_IRQHandler
IMPORT EXTI1_IRQHandler
IMPORT EXTI2_IRQHandler
IMPORT EXTI3_IRQHandler
IMPORT EXTI4_IRQHandler
IMPORT DMAChannel1_IRQHandler
IMPORT DMAChannel2_IRQHandler
IMPORT DMAChannel3_IRQHandler
IMPORT DMAChannel4_IRQHandler
IMPORT DMAChannel5_IRQHandler
IMPORT DMAChannel6_IRQHandler
IMPORT DMAChannel7_IRQHandler
IMPORT ADC_IRQHandler
IMPORT USB_HP_CAN_TX_IRQHandler
IMPORT USB_LP_CAN_RX0_IRQHandler
IMPORT CAN_RX1_IRQHandler
IMPORT CAN_SCE_IRQHandler
IMPORT EXTI9_5_IRQHandler
IMPORT TIM1_BRK_IRQHandler
IMPORT TIM1_UP_IRQHandler
IMPORT TIM1_TRG_COM_IRQHandler
IMPORT TIM1_CC_IRQHandler
IMPORT TIM2_IRQHandler
IMPORT TIM3_IRQHandler
IMPORT TIM4_IRQHandler
IMPORT I2C1_EV_IRQHandler
IMPORT I2C1_ER_IRQHandler
IMPORT I2C2_EV_IRQHandler
IMPORT I2C2_ER_IRQHandler
IMPORT SPI1_IRQHandler
IMPORT SPI2_IRQHandler
IMPORT USART1_IRQHandler
IMPORT USART2_IRQHandler
IMPORT USART3_IRQHandler
IMPORT EXTI15_10_IRQHandler
IMPORT RTCAlarm_IRQHandler
IMPORT USBWakeUp_IRQHandler
PRESERVE8
;**********************************************************************************
;* Reset code section.
;**********************************************************************************
AREA RESET, CODE, READONLY ;声明一个名称为RESET的代码段，属性只读
THUMB ;THUMB 不太清楚，猜测是THUMB状态
;*******************************************************************************
; Fill-up the Vector Table entries with the exceptions ISR address
;*******************************************************************************
EXPORT __Vectors ;声明__Vectors 外部可用
__Vectors ;这里设置了中断向量表，当发生中断时，跳到这里，再由这里，跳转到中断处理函数。
;这里比ARM7好的是直接跳转，不用二级跳转，所以这里的速度比ARM7的非向量中断快。在中断上性能较高
DCD Stack + Stack_Size ; Top of Stack 分配4字节内存，指向Stack + Stack_Size出的内存。（由其初始化）
DCD Reset_Handler ;分配4字节内存，指向Reset_Handler出的内存。（由Reset_Handler初始化）
DCD NMIException ;下同
DCD HardFaultException
DCD MemManageException
DCD BusFaultException
DCD UsageFaultException
DCD 0 ; Reserved 这里分配四字节内存，由0初始化，所以是保留。
DCD 0 ; Reserved 下同
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD SVCHandler
DCD DebugMonitor
DCD 0 ; Reserved
DCD OSPendSV
DCD SysTickHandler
DCD WWDG_IRQHandler
DCD PVD_IRQHandler
DCD TAMPER_IRQHandler
DCD RTC_IRQHandler
DCD FLASH_IRQHandler
DCD RCC_IRQHandler
DCD EXTI0_IRQHandler
DCD EXTI1_IRQHandler
DCD EXTI2_IRQHandler
DCD EXTI3_IRQHandler
DCD EXTI4_IRQHandler
DCD DMAChannel1_IRQHandler
DCD DMAChannel2_IRQHandler
DCD DMAChannel3_IRQHandler
DCD DMAChannel4_IRQHandler
DCD DMAChannel5_IRQHandler
DCD DMAChannel6_IRQHandler
DCD DMAChannel7_IRQHandler
DCD ADC_IRQHandler
DCD USB_HP_CAN_TX_IRQHandler
DCD USB_LP_CAN_RX0_IRQHandler
DCD CAN_RX1_IRQHandler
DCD CAN_SCE_IRQHandler
DCD EXTI9_5_IRQHandler
DCD TIM1_BRK_IRQHandler
DCD TIM1_UP_IRQHandler
DCD TIM1_TRG_COM_IRQHandler
DCD TIM1_CC_IRQHandler
DCD TIM2_IRQHandler
DCD TIM3_IRQHandler
DCD TIM4_IRQHandler
DCD I2C1_EV_IRQHandler
DCD I2C1_ER_IRQHandler
DCD I2C2_EV_IRQHandler
DCD I2C2_ER_IRQHandler
DCD SPI1_IRQHandler
DCD SPI2_IRQHandler
DCD USART1_IRQHandler
DCD USART2_IRQHandler
DCD USART3_IRQHandler
DCD EXTI15_10_IRQHandler
DCD RTCAlarm_IRQHandler
DCD USBWakeUp_IRQHandler
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD 0 ; Reserved
;******************************************************************************************
;* Reset entry
;******************************************************************************************
EXPORT Reset_Handler ;声明外部可用，当发生Reset_Handler中断时（即复位），跳到这里执行处理
Reset_Handler
IMPORT __main
LDR R0, =__main ;C 语言入口标识
BX R0
;******************************************************************************************
;* NMI exception handler.
;* It simply enters an infinite loop.
;******************************************************************************************
NMIException ;当发生NMIException 中断时，跳到这里执行处理
B NMIException ;这里默认死循环，既没有处理。下面同样的格式，和这里处理结果相同
;******************************************************************************************
;* Fault interrupt handler.
;* It simply enters an infinite loop.
;******************************************************************************************
HardFaultException ;当发生NMIException 中断时，跳到这里执行处理
B HardFaultException
;******************************************************************************************
;* MemManage interrupt handler.
;* It simply enters an infinite loop.
;******************************************************************************************
MemManageException
B MemManageException
;******************************************************************************************
;* Bus Fault interrupt handler.
;* It simply enters an infinite loop.
;******************************************************************************************
BusFaultException
B BusFaultException
;******************************************************************************************
;* UsageFault interrupt handler.
;* It simply enters an infinite loop.
;******************************************************************************************
UsageFaultException
B UsageFaultException
;******************************************************************************************
;* DebugMonitor interrupt handler.
;* It simply enters an infinite loop.
;******************************************************************************************
DebugMonitor
B DebugMonitor
;******************************************************************************************
;* SVCall interrupt handler.
;* It simply enters an infinite loop.
;******************************************************************************************
SVCHandler
B SVCHandler
;*******************************************************************************************
;* Make sure the end of this section is aligned.
;*******************************************************************************************
ALIGN ;字节对齐
;********************************************************************************************
;* Code section for initializing the heap and stack
;********************************************************************************************
AREA |.text|, CODE, READONLY ;声明一个代码段，属性为只读
;********************************************************************************************
;* The function expected of the C library startup
;* code for defining the stack and heap memory locations.
;********************************************************************************************
IMPORT __use_two_region_memory
EXPORT __user_initial_stackheap
__user_initial_stackheap ;初始化堆栈，为C库运行准备
LDR R0, =Heap ;初始化堆起始地址
LDR R1, =(Stack + Stack_Size) ;初始化栈起始地址，满栈递减
LDR R2, =(Heap + Heap_Size) ;堆最大地址
LDR R3, =Stack ;栈最小地址
BX LR ;
;******************************************************************************************
;* Make sure the end of this section is aligned.
;******************************************************************************************
ALIGN
;*******************************************************************************************
;* End Of File
;*******************************************************************************************
END |
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