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GPBCON EQU 0x56000010
GPBDAT EQU 0x56000014
WTCON EQU 0X53000000
LED1 EQU (14<<5)
LED2 EQU (13<<5)
LED3 EQU (11<<5)
LED4 EQU (7<<5)
CODE32
AREA ASM_LED,CODE ,READONLY
ENTRY
LDR R0,=WTCON ;看门狗关闭
LDR R1,=0
STR R1,[R0]
LDR SP,=1024*4
LDR R0,=GPBCON
LDR R1,=(1<<10|1<<12|1<<14|1<<16)
STR R1,[R0]
AGAIN
LDR R0, =GPBDAT
;LDR R2,[R0]
MOV R1,#LED1
STR R1,[R0]
LDR R1,=0X01200000
NEXT1
SUB R1,R1,#1
CMP R1,#0
BNE NEXT1
LDR R0, =GPBDAT
;LDR R2,[R0]
MOV R1,#LED2
STR R1,[R0]
LDR R1,=0x01200000
NEXT2
SUB R1,R1,#1
CMP R1,#0
BNE NEXT2
LDR R0, =GPBDAT
;LDR R2,[R0]
MOV R1,#LED3
STR R1,[R0]
LDR R1,=0X01200000
NEXT3
SUB R1,R1,#1
CMP R1,#0
BNE NEXT3
LDR R0, =GPBDAT
;LDR R2,[R0]
MOV R1,#LED4
STR R1,[R0]
LDR R1,=0X01200000
NEXT4
SUB R1,R1,#1
CMP R1,#0
BNE NEXT4
B AGAIN
END
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