ARM day4

1、实现LED1/LED2/LED3三盏灯循环点亮熄灭(统一上传链接，代码截图、实验现象图片)

.text 
.global _start
_start: 
	/**********LED1点灯**************/
/*初始化RCC章节*/
RCC_INIT:
	@通过RCC_MP_AHB4ENSETR寄存器，使能GPIOE组控制器
	LDR R0,=0X50000A28
	LDR R1,[R0]
	ORR R1,R1,#(0X1 << 4)
	STR R1,[R0]
	
	LDR R2,=0X50000A28
	LDR R3,[R2]
	ORR R3,R3,#(0X1 << 5)
	STR R3,[R2]

LED1_INIT:
	@通过GPIOE_MODER寄存器设置PE10引脚为输出模式
	LDR R0,=0X50006000
	LDR R1,[R0]
	ORR R1,R1,#(0X1 << 20)
	BIC R1,R1,#(0X1 << 21)
	STR R1,[R0]

	LDR R2,=0X50007000
	LDR R3,[R2]
	ORR R3,R3,#(0X1 << 20)
	BIC R3,R3,#(0X1 << 21)
	STR R3,[R2]

	LDR R0,=0X50006000
	LDR R1,[R0]
	ORR R1,R1,#(0X1 << 16)
	BIC R1,R1,#(0X1 << 17)
	STR R1,[R0]

	@通过GPIOE_OTYPER寄存器设置PE10引脚为推挽输出类型
	LDR R0,=0X50006004
	LDR R1,[R0]
	BIC R1,R1,#(0X1 << 10)
	STR R1,[R0]

	LDR R2,=0X50007004
	LDR R3,[R2]
	BIC R3,R3,#(0X1 << 10)
	STR R3,[R2]

	LDR R0,=0X50006004
	LDR R1,[R0]
	BIC R1,R1,#(0X1 << 8)
	STR R1,[R0]

	@通过GPIOE_OSPEEDR寄存器设置PE10引脚为低速输出
	LDR R0,=0X50006008
	LDR R1,[R0]
	BIC R1,R1,#(0X1 << 20)
	BIC R1,R1,#(0X1 << 21)
	STR R1,[R0]

	LDR R2,=0X50007008
	LDR R3,[R2]
	BIC R3,R3,#(0X1 << 20)
	BIC R3,R3,#(0X1 << 21)
	STR R3,[R2]

	LDR R0,=0X50006008
	LDR R1,[R0]
	BIC R1,R1,#(0X1 << 16)
	BIC R1,R1,#(0X1 << 17)
	STR R1,[R0]

	@通过GPIOE_PUPDR寄存器设置PE10引脚禁止上下拉电阻
	LDR R0,=0X5000600C
	LDR R1,[R0]
	BIC R1,R1,#(0X1 << 20)
	BIC R1,R1,#(0X1 << 21)
	STR R1,[R0]

	LDR R2,=0X5000700C
	LDR R3,[R2]
	BIC R3,R3,#(0X1 << 20)
	BIC R3,R3,#(0X1 << 21)
	STR R3,[R2]

	LDR R0,=0X5000600C
	LDR R1,[R0]
	BIC R1,R1,#(0X1 << 16)
	BIC R1,R1,#(0X1 << 17)
	STR R1,[R0]

LED_ON:
	@通过GPIOE_ODR寄存器设置PE10引脚输出高电平
	LDR R0,=0X50006014
	LDR R1,[R0]
	ORR R1,R1,#(0X1 << 10)
	STR R1,[R0]
	bl delay_1s

	LDR R2,=0X50007014
	LDR R3,[R2]
	ORR R3,R3,#(0X1 << 10)
	STR R3,[R2]
	bl delay_1s

	LDR R0,=0X50006014
	LDR R1,[R0]
	ORR R1,R1,#(0X1 << 8)
	STR R1,[R0]
	bl delay_1s

LED1_OFF:
	@通过GPIOE_ODR寄存器设置PE10引脚输出低电平
	LDR R0,=0X50006014
	LDR R1,[R0]
	BIC R1,R1,#(0X1 << 10)
	STR R1,[R0]
	bl delay_1s

	LDR R2,=0X50007014
	LDR R3,[R2]
	BIC R3,R3,#(0X1 << 10)
	STR R3,[R2]
	bl delay_1s

	LDR R0,=0X50006014
	LDR R1,[R0]
	BIC R1,R1,#(0X1 << 8)
	STR R1,[R0]
	bl delay_1s
	b LED_ON
@ 大概1s的延时函数
delay_1s:
	mov r3, #0x10000000
	mm:
	cmp r3, #0
	subne r3, r3, #1
	bne mm
	mov pc, lr

.end

led

2、思维导图