?? startup.s
字號(hào):
;/****************************************Copyright (c)**************************************************
;** Guangzou ZLG-MCU Development Co.,LTD.
;** graduate school
;** http://www.zlgmcu.com
;**
;**--------------File Info-------------------------------------------------------------------------------
;** File name: Startup.s
;** Last modified Date: 2004-09-17
;** Last Version: 1.0
;** Descriptions: The start up codes for LPC2200, including the initializing codes for the entry point of exceptions and the stacks of user tasks.
;** Every project should have a independent copy of this file for related modifications
;**------------------------------------------------------------------------------------------------------
;** Created by: Chenmingji
;** Created date: 2004-02-02
;** Version: 1.0
;** Descriptions: The original version
;**
;**------------------------------------------------------------------------------------------------------
;** Modified by: Chenmingji
;** Modified date: 2004-09-17
;** Version: 1.01
;** Descriptions: Modified the bus setting to adapt for many common situations
;**
;**------------------------------------------------------------------------------------------------------
;** Modified by: Chenmingji
;** Modified date: 2004-09-17
;** Version: 1.02
;** Descriptions: Added codes to support the enciphering of the chip
;**
;**------------------------------------------------------------------------------------------------------
;** Modified by: Chenmingji
;** Modified date: 2004-09-17
;** Version: 1.04
;** Descriptions: Renewed the template, added codes to support more compilers
;**
;**------------------------------------------------------------------------------------------------------
;** Modified by:
;** Modified date:
;** Version:
;** Descriptions:
;**
;********************************************************************************************************/
;define the stack size
;定義堆棧的大小
FIQ_STACK_LEGTH EQU 0
IRQ_STACK_LEGTH EQU 9*8 ;every layer need 9 bytes stack , permit 8 layer .每層嵌套需要9個(gè)字堆棧，允許8層嵌套
ABT_STACK_LEGTH EQU 0
UND_STACK_LEGTH EQU 0
NoInt EQU 0x80
USR32Mode EQU 0x10
SVC32Mode EQU 0x13
SYS32Mode EQU 0x1f
IRQ32Mode EQU 0x12
FIQ32Mode EQU 0x11
PINSEL2 EQU 0xE002C014
BCFG0 EQU 0xFFE00000
BCFG1 EQU 0xFFE00004
BCFG2 EQU 0xFFE00008
BCFG3 EQU 0xFFE0000C
IMPORT __use_no_semihosting_swi
IMPORT __use_two_region_memory
;The imported labels
;引入的外部標(biāo)號(hào)在這聲明
IMPORT FIQ_Exception ;Fast interrupt exceptions handler 快速中斷異常處理程序
IMPORT __main ;The entry point to the main function C語言主程序入口
IMPORT TargetResetInit ;initialize the target board 目標(biāo)板基本初始化
IMPORT SoftwareInterrupt
;The emported labels
;給外部使用的標(biāo)號(hào)在這聲明
EXPORT bottom_of_heap
EXPORT bottom_of_Stacks
EXPORT top_of_heap
EXPORT StackUsr
EXPORT Reset
EXPORT __user_initial_stackheap
CODE32
AREA vectors,CODE,READONLY
ENTRY
;interrupt vectors
;中斷向量表
Reset
LDR PC, ResetAddr
LDR PC, UndefinedAddr
LDR PC, SWI_Addr
LDR PC, PrefetchAddr
LDR PC, DataAbortAddr
DCD 0xb9205f80
LDR PC, [PC, #-0xff0]
LDR PC, FIQ_Addr
ResetAddr DCD ResetInit
UndefinedAddr DCD Undefined
SWI_Addr DCD SoftwareInterrupt
PrefetchAddr DCD PrefetchAbort
DataAbortAddr DCD DataAbort
Nouse DCD 0
IRQ_Addr DCD 0
FIQ_Addr DCD FIQ_Handler
;未定義指令
Undefined
B Undefined
;取指令中止
PrefetchAbort
B PrefetchAbort
;取數(shù)據(jù)中止
DataAbort
B DataAbort
;快速中斷
FIQ_Handler
STMFD SP!, {R0-R3, LR}
BL FIQ_Exception
LDMFD SP!, {R0-R3, LR}
SUBS PC, LR, #4
;/*********************************************************************************************************
;** unction name 函數(shù)名稱: InitStack
;** Descriptions 功能描述: Initialize the stacks 初始化堆棧
;** input parameters 輸 入: None 無
;** Returned value 輸 出 : None 無
;** Used global variables 全局變量: None 無
;** Calling modules 調(diào)用模塊: None 無
;**
;** Created by 作 者: Chenmingji 陳明計(jì)
;** Created Date 日 期: 2004/02/02 2004年2月2日
;**-------------------------------------------------------------------------------------------------------
;** Modified by 修 改:
;** Modified date 日 期:
;**-------------------------------------------------------------------------------------------------------
;********************************************************************************************************/
InitStack
MOV R0, LR
;Build the SVC stack
;設(shè)置中斷模式堆棧
MSR CPSR_c, #0xd2
LDR SP, StackIrq
;Build the FIQ stack
;設(shè)置快速中斷模式堆棧
MSR CPSR_c, #0xd1
LDR SP, StackFiq
;Build the DATAABORT stack
;設(shè)置中止模式堆棧
MSR CPSR_c, #0xd7
LDR SP, StackAbt
;Build the UDF stack
;設(shè)置未定義模式堆棧
MSR CPSR_c, #0xdb
LDR SP, StackUnd
;Build the SYS stack
;設(shè)置系統(tǒng)模式堆棧
MSR CPSR_c, #0xdf
LDR SP, =StackUsr
MOV PC, R0
;/*********************************************************************************************************
;** unction name 函數(shù)名稱: ResetInit
;** Descriptions 功能描述: RESET 復(fù)位入口
;** input parameters 輸 入: None 無
;** Returned value 輸 出 : None 無
;** Used global variables 全局變量: None 無
;** Calling modules 調(diào)用模塊: None 無
;**
;** Created by 作 者: Chenmingji 陳明計(jì)
;** Created Date 日 期: 2004/02/02 2004年2月2日
;**-------------------------------------------------------------------------------------------------------
;** Modified by 修 改: Chenmingji 陳明計(jì)
;** Modified date 日 期: 2004/02/02 2004年3月3日
;**-------------------------------------------------------------------------------------------------------
;********************************************************************************************************/
ResetInit
;Initial the extenal bus controller
;初始化外部總線控制器，根據(jù)目標(biāo)板決定配置
LDR R0, =PINSEL2
IF :DEF: EN_CRP
LDR R1, =0x0f814910
ELSE
LDR R1, =0x0f814914
ENDIF
STR R1, [R0]
LDR R0, =BCFG0
LDR R1, =0x1000ffef
STR R1, [R0]
LDR R0, =BCFG1
LDR R1, =0x1000ffef
STR R1, [R0]
; LDR R0, =BCFG2
; LDR R1, =0x2000ffef
; STR R1, [R0]
; LDR R0, =BCFG3
; LDR R1, =0x2000ffef
; STR R1, [R0]
BL InitStack ; Initialize the stack 初始化堆棧
BL TargetResetInit ; Initialize the target board 目標(biāo)板基本初始化
; Jump to the entry point of C program 跳轉(zhuǎn)到c語言入口
B __main
;/*********************************************************************************************************
;** unction name 函數(shù)名稱: __user_initial_stackheap
;** Descriptions 功能描述: Initial the function library stacks and heaps, can not deleted! 庫函數(shù)初始化堆和棧，不能刪除
;** input parameters 輸 入: reference by function library 參考庫函數(shù)手冊(cè)
;** Returned value 輸 出 : reference by function library 參考庫函數(shù)手冊(cè)
;** Used global variables 全局變量: None 無
;** Calling modules 調(diào)用模塊: None 無
;**
;** Created by 作 者: Chenmingji 陳明計(jì)
;** Created Date 日 期: 2004/02/02 2004年2月2日
;**-------------------------------------------------------------------------------------------------------
;** Modified by
;** Modified date
;**-------------------------------------------------------------------------------------------------------
;********************************************************************************************************/
__user_initial_stackheap
LDR r0,=bottom_of_heap
; LDR r1,=StackUsr
LDR r2,=top_of_heap
LDR r3,=bottom_of_Stacks
MOV pc,lr
StackIrq DCD IrqStackSpace + (IRQ_STACK_LEGTH - 1)* 4
StackFiq DCD FiqStackSpace + (FIQ_STACK_LEGTH - 1)* 4
StackAbt DCD AbtStackSpace + (ABT_STACK_LEGTH - 1)* 4
StackUnd DCD UndtStackSpace + (UND_STACK_LEGTH - 1)* 4
;/*********************************************************************************************************
;** unction name 函數(shù)名稱: CrpData
;** Descriptions 功能描述: encrypt the chip
;** input parameters 輸 入: None 無
;** Returned value 輸 出 : None 無
;** Used global variables 全局變量: None 無
;** Calling modules 調(diào)用模塊: None 無
;**
;** Created by 作 者: Chenmingji 陳明計(jì)
;** Created Date 日 期: 2004/03/27 2004年3月27日
;**-------------------------------------------------------------------------------------------------------
;** Modified by 修 改:
;** Modified date 日 期:
;**-------------------------------------------------------------------------------------------------------
;********************************************************************************************************/
IF :DEF: EN_CRP
IF . >= 0x1fc
INFO 1,"\nThe data at 0x000001fc must be 0x87654321.\nPlease delete some source before this line."
ENDIF
CrpData
WHILE . < 0x1fc
NOP
WEND
CrpData1
DCD 0x87654321 ;/*When the Data is 為0x87654321,user code be protected. 當(dāng)此數(shù)為0x87654321時(shí)，用戶程序被保護(hù) */
ENDIF
;/* 分配堆棧空間 */
AREA MyStacks, DATA, NOINIT, ALIGN=2
IrqStackSpace SPACE IRQ_STACK_LEGTH * 4 ;Stack spaces for Interrupt ReQuest Mode 中斷模式堆棧空間
FiqStackSpace SPACE FIQ_STACK_LEGTH * 4 ;Stack spaces for Fast Interrupt reQuest Mode 快速中斷模式堆棧空間
AbtStackSpace SPACE ABT_STACK_LEGTH * 4 ;Stack spaces for Suspend Mode 中止義模式堆棧空間
UndtStackSpace SPACE UND_STACK_LEGTH * 4 ;Stack spaces for Undefined Mode 未定義模式堆棧
AREA Heap, DATA, NOINIT
bottom_of_heap SPACE 1
AREA StackBottom, DATA, NOINIT
bottom_of_Stacks SPACE 1
AREA HeapTop, DATA, NOINIT
top_of_heap
AREA Stacks, DATA, NOINIT
StackUsr
END
;/*********************************************************************************************************
;** End Of File
;********************************************************************************************************/
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