boot.s

pxa270嵌入式开发板中断应用实例

	IMPORT	postDelay
	IMPORT	osStack
	
	IMPORT	init_Stack

	IMPORT	post_initGpio
	IMPORT	init_Memory
	IMPORT	post_initKey
	IMPORT	dummyOs
	IMPORT	IRQ_Handler
	
	IMPORT	ICMR
	IMPORT	init_ICMR
	
	IMPORT	PSSR
	
	

	AREA boot ,CODE ,READONLY

	ENTRY
	
	B Reset_Handler
	B Undefined_Handler
	B SWI_Handler
	B Prefetch_Handler
	B DataAbort_Handler
	NOP
	B IRQ_Handler 
	B FIQ_Handler



Undefined_Handler	
	B	Undefined_Handler
	
SWI_Handler 
	B	SWI_Handler
	
Prefetch_Handler
	B	Prefetch_Handler
	

DataAbort_Handler
	B	DataAbort_Handler
	

FIQ_Handler
	B	FIQ_Handler			;Defined by yourself



Reset_Handler

	;*************************
	;Check if run in the SDRAM
	;*************************
	MOV	R0,PC
	CMP R0,#0x0000003C
	BNE Stack
		
	;**************************
	;Init Memory
	;**************************
	mov r14,pc
	ldr pc,=init_Memory



	;**************************
	;Init Stack
	;**************************
Stack
	mov r14,pc
	ldr pc,=init_Stack

	
	
	;**************************
	;Init Gpio
	;**************************
	mov r14, pc
	ldr pc, =post_initGpio


	;***************************
	;Enable & Set Interrupt
	;***************************
	mrs  r1, CPSR
	bic  r1, r1,#0x80
	msr  CPSR_c, r1
			
	ldr  r1, =ICMR
	ldr  r2, =init_ICMR
	str  r2,[r1]



	;****************************
	;Init Keypad
	;****************************
	mov r14,pc
	ldr pc,=post_initKey




	;***************************
	;Power Manager Sleep Status Register
	;***************************
	ldr  r1, =PSSR
	mov r2, #0x30
	str  r2, [r1]

	
	
	;***************************
	;Loop
	;***************************
	ldr r0,=postDelay
postLoop	
	sub r0,r0,#0x1
	cmp r0,#0x0
	bne postLoop

	
	;***************************
	;Turn on the light of board
	;***************************
	MOV	R0,	#0xa000000
	LDR	R2,	=0xCFFF
	STRH	R2,	[R0,#0]

	
	ldr pc,=dummyOs
	
	END