📄 init.s
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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}
;*****************************************************************************
;
; ResetHandler is the startup code to be used
;
;*****************************************************************************
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,=0x7ff ;all sub interrupt disable, 2002/04/10
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]
]
[ {TRUE}
; rGPFDAT = (rGPFDAT & ~(0xf<<4)) | ((~data & 0xf)<<4);
; Led_Display
ldr r0,=GPGCON
ldr r1,=0xff95ffb6
str r1,[r0]
ldr r0,=GPGUP
ldr r1,=0xffff
str r1,[r0]
ldr r0,=GPGDAT
ldr r1,=0x0000
str r1,[r0]
bl Delay
ldr r1,=0xffff
str r1,[r0]
bl Delay
ldr r1,=0x0000
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
;add by lzf
; 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]
;********************************************************************
; End of Stack Setup
;********************************************************************
;
; Copy the read-write data block from ROM to RAM.
;
IMPORT |Image$$RO$$Limit| ; End of ROM code (=start of ROM data)
IMPORT |Image$$RW$$Base| ; Base of RAM to initialize
IMPORT |Image$$ZI$$Base| ; Base and limit of area
IMPORT |Image$$ZI$$Limit| ; to zero initialize
;modified by lzf
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
IMPORT C_vMain
program
[ :LNOT:THUMBCODE
bl C_vMain ;Don't use main() because ......
b .
]
[ THUMBCODE ;for start-up code for Thumb mode
orr lr,pc,#1
bx lr
CODE16
bl C_vMain ;Don't use main() because ......
b .
CODE32
]
Delay
ldr r3,=0x100000
Delay1
nop
nop
subs r3,r3,#1
bne Delay1
mov pc,lr
InitStacks
; Don't use DRAM,such as stmfd,ldmfd......
; SVCstack is initialized before
; Under toolkit ver 2.50, '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 is not initialized.
mov pc,lr ; The LR register may be not valid for the mode changes.
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
;
;*****************************************************************************
;
; Zero-initialized read/write data area for stacks.
; This area is determined by the RW value in the Linker under "entry and base".
;*****************************************************************************
AREA SYS_STK, DATA, READWRITE, NOINIT
;*****************************************************************************
;
; Memory buffers to contain the stacks for the various processor modes which
; we will be using.
;
;*****************************************************************************
^ STK_SADDR
UserStack # _SVC_STKSIZE
SVCStack # _UND_STKSIZE
UndefStack # _ABT_STKSIZE
AbortStack # _IRQ_STKSIZE
IRQStack # _FIQ_STKSIZE
FIQStack # 0
AREA ISR_HOOK, DATA, READWRITE, NOINIT
^ ISR_BADDR
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
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