;/****************************************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 LPC2100, 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

    IMPORT __use_no_semihosting_swi
    
;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(yǔ)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  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

        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(yǔ)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(kù)函數(shù)初始化堆和棧，不能刪除
;** input parameters 	輸　入:   	reference by function library 參考庫(kù)函數(shù)手冊(cè)
;** Returned value   	輸　出 :  	reference by function library 參考庫(kù)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			
    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    Stacks, DATA, NOINIT
StackUsr

    END
;/*********************************************************************************************************
;**                            End Of File
;********************************************************************************************************/