ARM day4 作业
1，点亮三个灯，并闪烁
.text
.global _start
_start:
@led1灯
@设置GPIOE时钟使能 RCC_MP_AHB4ENSETR[4]->1 @0X50000A28
LDR R0,=0X50000A28
LDR R1,[R0]
ORR R1,R1,#(0x1<<4)
STR R1,[R0]
@设置PE10为输出 GPIOE_MODER[21:20]->01 0X50006000
LDR R0,=0X50006000
LDR R1,[R0]
BIC R1,R1,#(0x3<<20)
ORR R1,R1,#(0x1<<20)
STR R1,[R0]
@设置PE10为推挽输出 GPIOE_OTYPER[10]->0 0X50006004
LDR R0,=0X50006004
LDR R1,[R0]
BIC R1,R1,#(0x1<<10)
STR R1,[R0]
@设置PE10为低速输出 GPIOE_OSPEEDR[21:20]->00 0X50006008
LDR R0,=0X50006008
LDR R1,[R0]
BIC R1,R1,#(0x3<<20)
STR R1,[R0]
@设置PE10输出时无上拉下拉电阻 GPIOE_PUPDR[21:20]->00 0X5000600C
LDR R0,=0X5000600C
LDR R1,[R0]
BIC R1,R1,#(0x3<<20)
STR R1,[R0]
@led2灯
LDR R2,=0X50000A28
LDR R3,[R2]
ORR R3,R3,#(0x1<<5)
STR R3,[R2]
LDR R2,=0X50007000
LDR R3,[R2]
BIC R3,R3,#(0x3<<20)
ORR R3,R3,#(0x1<<20)
STR R3,[R2]
LDR R2,=0X50007004
LDR R3,[R2]
BIC R3,R3,#(0x1<<10)
STR R3,[R2]
LDR R2,=0X50007008
LDR R3,[R2]
BIC R3,R3,#(0x3<<20)
STR R3,[R2]
LDR R2,=0X5000700C
LDR R3,[R2]
BIC R3,R3,#(0x3<<20)
STR R3,[R2]
@led3灯
LDR R4,=0X50006000
LDR R5,[R4]
BIC R5,R5,#(0x3<<16)
ORR R5,R5,#(0x1<<16)
STR R5,[R4]
LDR R4,=0X50006004
LDR R5,[R4]
BIC R5,R5,#(0x1<<8)
STR R5,[R4]
LDR R4,=0X50006008
LDR R5,[R4]
BIC R5,R5,#(0x3<<16)
STR R5,[R4]
LDR R4,=0X5000600C
LDR R5,[R4]
BIC R5,R5,#(0x3<<16)
STR R5,[R4]
loop:
bl led1_on
bl led2_on
bl led3_on
bl delay
bl led1_off
bl led2_off
bl led3_off
bl delay
b loop
led1_on:
LDR R0,=0X50006014
LDR R1,[R0]
ORR R1,R1,#(0x1<<10)
STR R1,[R0]
mov pc,lr
led1_off:
LDR R0,=0X50006014
LDR R1,[R0]
BIC R1,R1,#(0x1<<10)
STR R1,[R0]
mov pc,lr
led2_on:
LDR R2,=0X50007014
LDR R3,[R2]
ORR R3,R3,#(0x1<<10)
STR R3,[R2]
mov pc,lr
led2_off:
LDR R2,=0X50007014
LDR R3,[R2]
BIC R3,R3,#(0x1<<10)
STR R3,[R2]
mov pc,lr
led3_on:
LDR R4,=0X50006014
LDR R5,[R4]
ORR R5,R5,#(0x1<<8)
STR R5,[R4]
mov pc,lr
led3_off:
LDR R4,=0X50006014
LDR R5,[R4]
BIC R5,R5,#(0x1<<8)
STR R5,[R4]
mov pc,lr
delay:
LDR R6,=0X10000000
mm:
cmp r6,#0
subne r6,r6,#1
bne mm
mov pc,lr
.end
2，思维导图