tes.s

自己写的ARM移植代码

	AREA TEST,CODE,READONLY
	   ENTRY
IOPMOD	 EQU  0x3ff5000
IOPCON   EQU  0x3FF5004
IOPDATA  EQU  0x3FF5008	   
   EXPORT STAR
STAR
	LDR	r1, =IOPMOD
	LDR	r0, =0xFF
	STR	r0, [r1]
loop
	LDR	r1, =IOPDATA
	LDR	r0, =0xF0 
	STR	r0, [r1]
	
	mov r6,#0xff
dlay1
	MOV r7,#0xff
delay1
 	SUBS r7,r7,#1
    BNE  delay1
    subs r6,r6,#1
    bne dlay1
    
    LDR	r1, =IOPDATA
	LDR	r0, =0x0F 
	STR	r0, [r1]
	
	mov r6,#0xff
dlay2
	MOV r7,#0xff
delay2
 	SUBS r7,r7,#1
    BNE  delay2    
	subs r6,r6,#1
	bne dlay2
    B loop
    END