三盏灯流水

.text 
.global _start
_start: 
@1.
	LDR R0,=0X50000A28
	LDR R1,[R0]
	ORR R1,R1,#(0X1<<4)
	STR R1,[R0]
@1.
	LDR R0,=0X50000A28
	LDR R1,[R0]
	ORR R1,R1,#(0X1<<5)
	STR R1,[R0]
@2.
	LDR R0,=0X50006000
	LDR R1,[R0]
	BIC R1,R1,#(0X3<<20)
	ORR R1,R1,#(0X1<<20)
	STR R1,[R0]
@3.
	LDR R0,=0X50006004
	LDR R1,[R0]
	BIC R1,R1,#(0X1<<10)
	STR R1,[R0]


@4.
	LDR R0,=0X50006008
	LDR R1,[R0]
	BIC R1,R1,#(0X3<<20)
	STR R1,[R0]



@5.
	LDR R0,=0X5000600C
	LDR R1,[R0]
	BIC R1,R1,#(0X3<<20)
	STR R1,[R0]

@2.
	LDR R0,=0X50007000
	LDR R1,[R0]
	BIC R1,R1,#(0X3<<20)
	ORR R1,R1,#(0X1<<20)
	STR R1,[R0]
@3.
	LDR R0,=0X50007004
	LDR R1,[R0]
	BIC R1,R1,#(0X1<<10)
	STR R1,[R0]


@4.
	LDR R0,=0X50007008
	LDR R1,[R0]
	BIC R1,R1,#(0X3<<20)
	STR R1,[R0]



@5.
	LDR R0,=0X5000700C
	LDR R1,[R0]
	BIC R1,R1,#(0X3<<20)
	STR R1,[R0]

@2.
	LDR R0,=0X50006000
	LDR R1,[R0]
	BIC R1,R1,#(0X3<<16)
	ORR R1,R1,#(0X1<<16)
	STR R1,[R0]
@3.
	LDR R0,=0X50006004
	LDR R1,[R0]
	BIC R1,R1,#(0X1<<8)
	STR R1,[R0]


@4.
	LDR R0,=0X50006008
	LDR R1,[R0]
	BIC R1,R1,#(0X3<<16)
	STR R1,[R0]



@5.
	LDR R0,=0X5000600C
	LDR R1,[R0]
	BIC R1,R1,#(0X3<<16)
	STR R1,[R0]

@6.
LOOP:
	@亮
	LDR R0,=0X50006014
	LDR R1,[R0]
	ORR R1,R1,#(0X1<<10)
	STR R1,[R0]
	BL delay
	@灭
	LDR R0,=0X50006014
	LDR R1,[R0]
	BIC R1,R1,#(0X1<<10)
	STR R1,[R0]
	BL delay
	
	@亮
	LDR R0,=0X50007014
	LDR R1,[R0]
	ORR R1,R1,#(0X1<<10)
	STR R1,[R0]
	BL delay
	@灭
	LDR R0,=0X50007014
	LDR R1,[R0]
	BIC R1,R1,#(0X1<<10)
	STR R1,[R0]
	BL delay

	@亮
	LDR R0,=0X50006014
	LDR R1,[R0]
	ORR R1,R1,#(0X1<<8)
	STR R1,[R0]
	BL delay
	@灭
	LDR R0,=0X50006014
	LDR R1,[R0]
	BIC R1,R1,#(0X1<<8)
	STR R1,[R0]
	BL delay
	b LOOP

@封装函数
delay:
	LDR R4,=0X10000000
mm:
	cmp R4,#0
	subne R4,R4,#1
	bne mm
	mov pc,lr


		

.end

测试结果