ucOS_II移植:Stm32启动代码分析

用的编译工具是keil，在用keil建立stm32工程时，一般会产生一个启动文件，STM32F10x.s,在st提供的库函数里，用cortexm3_macro.s和stm32f10x_vector.s来代替这个文件。不过内容都大同小异。

我在csdn上搜到了一个在stm32上移植好的ucos,打算在这个代码的基础上，添加注释，先学别人的，然后再自己移植。

我获得的这份例程，使用了startup_stm32f10x_md.s作为启动文件，其中，删去了部分采用扩展SRAM的代码。

其文件内容为

startup_stm32f10x_md.s

;* File Name : startup_stm32f10x_md.s

;* Author : MCD Application Team

;* Version : V3.3.0

;* Date : 04/16/2010

;* Description:STM32F10x Medium Density Devices vector table for RVMDK

;* toolchain.

;* This module performs:

;* - Set the initial SP

;* - Set the initial PC ==Reset_Handler

;* - Set the vector table entries withthe exceptions ISR address

;* - Configure the clocksystem

;* - Branches to __main in the C library(which eventually

;* calls main()).

;* After Reset the CortexM3 processoris in Thread mode,

;* priority is Privileged, and theStack is set to Main.

;* <<< UseConfiguration Wizard in Context Menu >>>

;***********************************************************************

; THE PRESENT FIRMWAREWHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS

; WITH CODINGINFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.

; AS A RESULT, STMICROELECTRONICSSHALL NOT BE HELD LIABLE FOR ANY DIRECT,

; INDIRECT ORCONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE

; CONTENT OF SUCHFIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING

; INFORMATION CONTAINEDHEREIN IN CONNECTION WITH THEIR PRODUCTS.

;**********************************************************************

; Amount of memory (inbytes) allocated for Stack

; Tailor this value toyour application needs

; <h> StackConfiguration

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

; </h>

Stack_Size EQU 0x00000400

;定义堆栈大小

AREA STACK, NOINIT, READWRITE, ALIGN=3

Stack_Mem SPACE Stack_Size

__initial_sp

;此处定义STACK段的程序，该段入口为__initial_sp,这是值在后面放在了0x00000000的位置处，作为MSP的初始值，一般程序

;编译的时候，由编译器赋值。我的编译器将其赋为0x20001138,如果用到了外接的SRAM,需要用

;__initial_sp EQU0x20000000 + Stack_Size 来定义

; <h> HeapConfiguration

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

; </h>

Heap_Size EQU 0x00000200

AREA HEAP, NOINIT, READWRITE, ALIGN=3

__heap_base

Heap_Mem SPACE Heap_Size

__heap_limit

PRESERVE8

THUMB

; Vector Table Mapped toAddress 0 at Reset

;下面是地址0x00000000 开始处的中断向量表，此段名RESET不可更改，是编译器里默认的起始段

AREA RESET, DATA, READONLY

EXPORT __Vectors

EXPORT __Vectors_End

EXPORT __Vectors_Size

__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 SVC_Handler ; SVCall Handler

DCD DebugMon_Handler ; Debug Monitor Handler

DCD 0 ; Reserved

;DCD PendSV_Handler ; PendSV Handler

DCD OSPendSV ;PendSV Handler(for uCOS-II)

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_2

DCD USB_HP_CAN1_TX_IRQHandler; USB HighPriority 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

__Vectors_End

__Vectors_Size EQU __Vectors_End - __Vectors

AREA |.text|, CODE, READONLY

; Reset handler

Reset_Handler PROC

;此处删除了原有的关于扩展SRAM的代码，看来这个是默认内部SRAM的 EXPORT Reset_Handler [WEAK]

IMPORT __main

IMPORT SystemInit ;是初始化RCC外设等的函数，原来的程序是在main起来之后初始化的

LDR R0, =SystemInit ;这里多了一个SystemInit函数的调用，原来的是直接跳到__main

BLX R0

LDR R0, =__main

BX R0

ENDP

; Dummy ExceptionHandlers (infinite loops which can be modified)

;这一段的函数定义和声明很是麻烦，其实，只要在DCD前面，用命令IMPORT 来声明一下也是可以的

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]

; (for uCOS-II)

OSPendSV PROC

EXPORT OSPendSV [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]

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

B .

ENDP

ALIGN

;*******************************************************************************

; User Stack and Heapinitialization

;*******************************************************************************

IF :DEF:__MICROLIB

;这里是定义了microlib的情况，一般用在单片机上，都定义这个库

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

startup_stm32f10x_md.s结束

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