2410init.s

ARM9 ADS1.2编译器的串口源程序 其中含汇编和C源程序

;=========================================
; NAME: 2410INIT.S
; DESC: C start up codes
;       Configure memory, ISR ,stacks
;	Initialize C-variables
; HISTORY:
; 2002.02.25:kwtark: ver 0.0
; 2002.03.20:purnnamu: Add some functions for testing STOP,POWER_OFF mode
;=========================================

	GET option.inc
	GET memcfg.inc
	GET 2410addr.inc

BIT_SELFREFRESH EQU	(1<<22)

;Pre-defined constants
USERMODE    EQU 	0x10
FIQMODE     EQU 	0x11
IRQMODE     EQU 	0x12
SVCMODE     EQU 	0x13
ABORTMODE   EQU 	0x17
UNDEFMODE   EQU 	0x1b
MODEMASK    EQU 	0x1f
NOINT       EQU 	0xc0

;The location of stacks
UserStack	EQU	(_STACK_BASEADDRESS-0x3800)	;0x33ff4800 ~ 
SVCStack        EQU	(_STACK_BASEADDRESS-0x2800) 	;0x33ff5800 ~
UndefStack	EQU	(_STACK_BASEADDRESS-0x2400) 	;0x33ff5c00 ~
AbortStack	EQU	(_STACK_BASEADDRESS-0x2000) 	;0x33ff6000 ~
IRQStack        EQU	(_STACK_BASEADDRESS-0x1000)	;0x33ff7000 ~
FIQStack	EQU	(_STACK_BASEADDRESS-0x0)	;0x33ff8000 ~ 

;Check if tasm.exe(armasm -16 ...@ADS 1.0) is used.
	GBLL    THUMBCODE
	[ {CONFIG} = 16 
THUMBCODE SETL  {TRUE}
	    CODE32
    	|   
THUMBCODE SETL  {FALSE}
    	]

    	MACRO
	MOV_PC_LR
    	[ THUMBCODE
            bx lr
    	|
            mov	pc,lr
    	]
	MEND

    	MACRO
	MOVEQ_PC_LR
    	[ THUMBCODE
    	    bxeq lr
    	|
            moveq pc,lr
    	]
	MEND

    	MACRO
$HandlerLabel HANDLER $HandleLabel

$HandlerLabel
	sub	sp,sp,#4        ;decrement sp(to store jump address)
	stmfd	sp!,{r0}        ;PUSH the work register to stack(lr does't push because it return to original address)
	ldr     r0,=$HandleLabel;load the address of HandleXXX to r0
	ldr     r0,[r0]         ;load the contents(service routine start address) of HandleXXX
	str     r0,[sp,#4]      ;store the contents(ISR) of HandleXXX to stack
	ldmfd   sp!,{r0,pc}     ;POP the work register and pc(jump to ISR)
	MEND
	

	IMPORT  |Image$$RO$$Limit|  ; End of ROM code (=start of ROM data)
	IMPORT  |Image$$RW$$Base|   ; Base of RAM to initialise
	IMPORT  |Image$$ZI$$Base|   ; Base and limit of area
	IMPORT  |Image$$ZI$$Limit|  ; to zero initialise
	
	IMPORT  Main    ; The main entry of mon program 
	
	AREA    Init,CODE,READONLY

	ENTRY 

	;1)The code, which converts to Big-endian, should be in little endian code.
	;2)The following little endian code will be compiled in Big-Endian mode. 
	;  The code byte order should be changed as the memory bus width.
	;3)The pseudo instruction,DCD can't be used here because the linker generates error.
	ASSERT	:DEF:ENDIAN_CHANGE
	[ ENDIAN_CHANGE
	    ASSERT  :DEF:ENTRY_BUS_WIDTH
	    [ ENTRY_BUS_WIDTH=32
		b	ChangeBigEndian	    ;DCD 0xea000007 
	    ]
	    
	    [ ENTRY_BUS_WIDTH=16
		andeq	r14,r7,r0,lsl #20   ;DCD 0x0007ea00
	    ]
	    
	    [ ENTRY_BUS_WIDTH=8
		streq	r0,[r0,-r10,ror #1] ;DCD 0x070000ea
            ]
	|
	    b	ResetHandler  
    	]
	b	HandlerUndef	;handler for Undefined mode
	b	HandlerSWI	;handler for SWI interrupt
	b	HandlerPabort	;handler for PAbort
	b	HandlerDabort	;handler for DAbort
	b	.		;reserved
	b	HandlerIRQ	;handler for IRQ interrupt 
	b	HandlerFIQ	;handler for FIQ interrupt

;@0x20
	b	EnterPWDN
ChangeBigEndian
;@0x24
	[ ENTRY_BUS_WIDTH=32
	    DCD	0xee110f10	;0xee110f10 => mrc p15,0,r0,c1,c0,0
	    DCD	0xe3800080	;0xe3800080 => orr r0,r0,#0x80;  //Big-endian
	    DCD	0xee010f10	;0xee010f10 => mcr p15,0,r0,c1,c0,0
	]
	[ ENTRY_BUS_WIDTH=16
	    DCD 0x0f10ee11
	    DCD 0x0080e380	
	    DCD 0x0f10ee01	
	]
	[ ENTRY_BUS_WIDTH=8
	    DCD 0x100f11ee	
	    DCD 0x800080e3	
	    DCD 0x100f01ee	
    	]
	DCD 0xffffffff  ;swinv 0xffffff is similar with NOP and run well in both endian mode. 
	DCD 0xffffffff
	DCD 0xffffffff
	DCD 0xffffffff
	DCD 0xffffffff
	b ResetHandler
	
;Function for entering power down mode
; 1. SDRAM should be in self-refresh mode.
; 2. All interrupt should be maksked for SDRAM/DRAM self-refresh.
; 3. LCD controller should be disabled for SDRAM/DRAM self-refresh.
; 4. The I-cache may have to be turned on. 
; 5. The location of the following code may have not to be changed.

;void EnterPWDN(int CLKCON); 
EnterPWDN			
	mov r2,r0		;r2=rCLKCON
	tst r0,#0x8		;POWER_OFF mode?
	bne ENTER_POWER_OFF

ENTER_STOP	
	ldr r0,=REFRESH		
	ldr r3,[r0]		;r3=rREFRESH	
	mov r1, r3
	orr r1, r1, #BIT_SELFREFRESH
	str r1, [r0]		;Enable SDRAM self-refresh

	mov r1,#16	   	;wait until self-refresh is issued. may not be needed.
0	subs r1,r1,#1
	bne %B0

	ldr r0,=CLKCON		;enter STOP mode.
	str r2,[r0]    

	mov r1,#32
0	subs r1,r1,#1	;1) wait until the STOP mode is in effect.
	bne %B0		;2) Or wait here until the CPU&Peripherals will be turned-off
			;   Entering POWER_OFF mode, only the reset by wake-up is available.

	ldr r0,=REFRESH ;exit from SDRAM self refresh mode.
	str r3,[r0]
	
	MOV_PC_LR

ENTER_POWER_OFF	
	;NOTE.
	;1) rGSTATUS3 should have the return address after wake-up from POWER_OFF mode.
	
	ldr r0,=REFRESH		
	ldr r1,[r0]		;r1=rREFRESH	
	orr r1, r1, #BIT_SELFREFRESH
	str r1, [r0]		;Enable SDRAM self-refresh

	mov r1,#16	   	;Wait until self-refresh is issued,which may not be needed.
0	subs r1,r1,#1
	bne %B0

	ldr 	r1,=MISCCR
	ldr	r0,[r1]
	orr	r0,r0,#(7<<17)  ;Make sure that SCLK0:SCLK->0, SCLK1:SCLK->0, SCKE=L during boot-up 
	str	r0,[r1]

	ldr r0,=CLKCON
	str r2,[r0]    

	b .			;CPU will die here.
	

WAKEUP_POWER_OFF
	;Release SCLKn after wake-up from the POWER_OFF mode.

	ldr 	r1,=MISCCR
	ldr	r0,[r1]
	bic	r0,r0,#(7<<17)  ;SCLK0:0->SCLK, SCLK1:0->SCLK, SCKE:L->H
	str	r0,[r1]

	;Set memory control registers
    	ldr	r0,=SMRDATA
	ldr	r1,=BWSCON	;BWSCON Address
	add	r2, r0, #52	;End address of SMRDATA
0       
	ldr	r3, [r0], #4    
	str	r3, [r1], #4    
	cmp	r2, r0		
	bne	%B0

	mov r1,#256
0	subs r1,r1,#1	;1) wait until the SelfRefresh is released.
	bne %B0		
	
	ldr r1,=GSTATUS3 	;GSTATUS3 has the start address just after POWER_OFF wake-up
	ldr r0,[r1]
	mov pc,r0

	LTORG   
HandlerFIQ      HANDLER HandleFIQ
HandlerIRQ      HANDLER HandleIRQ
HandlerUndef    HANDLER HandleUndef
HandlerSWI      HANDLER HandleSWI
HandlerDabort   HANDLER HandleDabort
HandlerPabort   HANDLER HandlePabort

IsrIRQ  
	sub	sp,sp,#4       ;reserved for PC
	stmfd	sp!,{r8-r9}   
	
	ldr	r9,=INTOFFSET
	ldr	r9,[r9]
	ldr	r8,=HandleEINT0
	add	r8,r8,r9,lsl #2
	ldr	r8,[r8]
	str	r8,[sp,#8]
	ldmfd	sp!,{r8-r9,pc}

;=======
; ENTRY  
;=======
ResetHandler
	ldr	r0,=WTCON       ;watch dog disable 
	ldr	r1,=0x0         
	str	r1,[r0]

	ldr	r0,=INTMSK
	ldr	r1,=0xffffffff  ;all interrupt disable
	str	r1,[r0]

	ldr	r0,=INTSUBMSK
	ldr	r1,=0x3ff		;all sub interrupt disable
	str	r1,[r0]

	[ {FALSE}
        ; rGPFDAT = (rGPFDAT & ~(0xf<<4)) | ((~data & 0xf)<<4);    
        ; Led_Display
	ldr	r0,=GPFCON
	ldr	r1,=0x5500		
	str	r1,[r0]
	ldr	r0,=GPFDAT
	ldr	r1,=0x10
	str	r1,[r0]
	]
	
	;To reduce PLL lock time, adjust the LOCKTIME register. 
	ldr	r0,=LOCKTIME
	ldr	r1,=0xffffff
	str	r1,[r0]
        
    	[ PLL_ON_START
	;Configure MPLL
	ldr	r0,=MPLLCON          
	ldr	r1,=((M_MDIV<<12)+(M_PDIV<<4)+M_SDIV)  ;Fin=12MHz,Fout=50MHz
	str	r1,[r0]
	]

	;Check if the boot is caused by the wake-up from POWER_OFF mode.
	ldr	r1,=GSTATUS2
	ldr	r0,[r1]
	tst	r0,#0x2
        ;In case of the wake-up from POWER_OFF mode, go to POWER_OFF_WAKEUP handler. 
	bne	WAKEUP_POWER_OFF

	EXPORT StartPointAfterPowerOffWakeUp
StartPointAfterPowerOffWakeUp

	;Set memory control registers
    	ldr	r0,=SMRDATA
	ldr	r1,=BWSCON	;BWSCON Address
	add	r2, r0, #52	;End address of SMRDATA
0       
	ldr	r3, [r0], #4    
	str	r3, [r1], #4    
	cmp	r2, r0		
	bne	%B0

    	;Initialize stacks
	bl	InitStacks
	
  	; Setup IRQ handler
	ldr	r0,=HandleIRQ       ;This routine is needed
	ldr	r1,=IsrIRQ          ;if there isn't 'subs pc,lr,#4' at 0x18, 0x1c
	str	r1,[r0]

	;Copy and paste RW data/zero initialized data
	ldr	r0, =|Image$$RO$$Limit| ; Get pointer to ROM data
	ldr	r1, =|Image$$RW$$Base|  ; and RAM copy
	ldr	r3, =|Image$$ZI$$Base|  
	
	;Zero init base => top of initialised data
	cmp	r0, r1      ; Check that they are different
	beq	%F2
1       
	cmp	r1, r3      ; Copy init data
	ldrcc	r2, [r0], #4    ;--> LDRCC r2, [r0] + ADD r0, r0, #4         
	strcc	r2, [r1], #4    ;--> STRCC r2, [r1] + ADD r1, r1, #4
	bcc	%B1
2       
	ldr	r1, =|Image$$ZI$$Limit| ; Top of zero init segment
	mov	r2, #0
3       
	cmp	r3, r1      ; Zero init
	strcc	r2, [r3], #4
	bcc	%B3

	

    [ :LNOT:THUMBCODE
    	bl	Main        ;Don't use main() because ......
    	b	.                       
    ]

    [ THUMBCODE         ;for start-up code for Thumb mode
    	orr	lr,pc,#1
    	bx	lr
    	CODE16
    	bl	Main        ;Don't use main() because ......
    	b	.
    	CODE32
    ]


;function initializing stacks
InitStacks
	;Don't use DRAM,such as stmfd,ldmfd......
	;SVCstack is initialized before
	;Under toolkit ver 2.5, 'msr cpsr,r1' can be used instead of 'msr cpsr_cxsf,r1'
	mrs	r0,cpsr
	bic	r0,r0,#MODEMASK
	orr	r1,r0,#UNDEFMODE|NOINT
	msr	cpsr_cxsf,r1		;UndefMode
	ldr	sp,=UndefStack
	
	orr	r1,r0,#ABORTMODE|NOINT
	msr	cpsr_cxsf,r1		;AbortMode
	ldr	sp,=AbortStack

	orr	r1,r0,#IRQMODE|NOINT
	msr	cpsr_cxsf,r1		;IRQMode
	ldr	sp,=IRQStack
    
	orr	r1,r0,#FIQMODE|NOINT
	msr	cpsr_cxsf,r1		;FIQMode
	ldr	sp,=FIQStack

	bic	r0,r0,#MODEMASK|NOINT
	orr	r1,r0,#SVCMODE
	msr	cpsr_cxsf,r1		;SVCMode
	ldr	sp,=SVCStack
	
	;USER mode has not be initialized.
	
	mov	pc,lr 
	;The LR register won't be valid if the current mode is not SVC mode.
	

	LTORG

SMRDATA DATA
; Memory configuration should be optimized for best performance 
; The following parameter is not optimized.                     
; Memory access cycle parameter strategy
; 1) The memory settings is  safe parameters even at HCLK=75Mhz.
; 2) SDRAM refresh period is for HCLK=75Mhz. 

        DCD (0+(B1_BWSCON<<4)+(B2_BWSCON<<8)+(B3_BWSCON<<12)+(B4_BWSCON<<16)+(B5_BWSCON<<20)+(B6_BWSCON<<24)+(B7_BWSCON<<28))
    	DCD ((B0_Tacs<<13)+(B0_Tcos<<11)+(B0_Tacc<<8)+(B0_Tcoh<<6)+(B0_Tah<<4)+(B0_Tacp<<2)+(B0_PMC))   ;GCS0
    	DCD ((B1_Tacs<<13)+(B1_Tcos<<11)+(B1_Tacc<<8)+(B1_Tcoh<<6)+(B1_Tah<<4)+(B1_Tacp<<2)+(B1_PMC))   ;GCS1 
    	DCD ((B2_Tacs<<13)+(B2_Tcos<<11)+(B2_Tacc<<8)+(B2_Tcoh<<6)+(B2_Tah<<4)+(B2_Tacp<<2)+(B2_PMC))   ;GCS2
    	DCD ((B3_Tacs<<13)+(B3_Tcos<<11)+(B3_Tacc<<8)+(B3_Tcoh<<6)+(B3_Tah<<4)+(B3_Tacp<<2)+(B3_PMC))   ;GCS3
    	DCD ((B4_Tacs<<13)+(B4_Tcos<<11)+(B4_Tacc<<8)+(B4_Tcoh<<6)+(B4_Tah<<4)+(B4_Tacp<<2)+(B4_PMC))   ;GCS4
    	DCD ((B5_Tacs<<13)+(B5_Tcos<<11)+(B5_Tacc<<8)+(B5_Tcoh<<6)+(B5_Tah<<4)+(B5_Tacp<<2)+(B5_PMC))   ;GCS5
    	DCD ((B6_MT<<15)+(B6_Trcd<<2)+(B6_SCAN))    ;GCS6
    	DCD ((B7_MT<<15)+(B7_Trcd<<2)+(B7_SCAN))    ;GCS7
    	DCD ((REFEN<<23)+(TREFMD<<22)+(Trp<<20)+(Trc<<18)+(Tchr<<16)+REFCNT)    



	DCD 0x32            ;SCLK power saving mode, BANKSIZE 128M/128M

    	DCD 0x30            ;MRSR6 CL=3clk
    	DCD 0x30            ;MRSR7
;    	DCD 0x20            ;MRSR6 CL=2clk
;    	DCD 0x20            ;MRSR7

    	ALIGN


    	AREA RamData, DATA, READWRITE

        ^   _ISR_STARTADDRESS
HandleReset 	#   4
HandleUndef 	#   4
HandleSWI   	#   4
HandlePabort    #   4
HandleDabort    #   4
HandleReserved  #   4
HandleIRQ   	#   4
HandleFIQ   	#   4

;Don't use the label 'IntVectorTable',
;The value of IntVectorTable is different with the address you think it may be.
;IntVectorTable
HandleEINT0   	#   4
HandleEINT1   	#   4
HandleEINT2   	#   4
HandleEINT3   	#   4
HandleEINT4_7	#   4
HandleEINT8_23	#   4
HandleRSV6	#   4
HandleBATFLT   	#   4
HandleTICK   	#   4
HandleWDT	#   4
HandleTIMER0 	#   4
HandleTIMER1 	#   4
HandleTIMER2 	#   4
HandleTIMER3 	#   4
HandleTIMER4 	#   4
HandleUART2  	#   4
HandleLCD 	#   4
HandleDMA0	#   4
HandleDMA1	#   4
HandleDMA2	#   4
HandleDMA3	#   4
HandleMMC	#   4
HandleSPI0	#   4
HandleUART1	#   4
HandleRSV24	#   4
HandleUSBD	#   4
HandleUSBH	#   4
HandleIIC   	#   4
HandleUART0 	#   4
HandleSPI1 	#   4
HandleRTC 	#   4
HandleADC 	#   4

        END