1.汇编代码

.text 
.global _start
_start: 

//RCC初始化
RCC_INIT:
	//设置GPIOE组使能
	ldr r0,=0x50000A28
	ldr r1,[r0]
	orr r1,r1,#(0x1<<4)
	str r1,[r0]

	//设置GPIOF组使能 
	ldr r0,=0x50000A28
	ldr r1,[r0]
	orr r1,r1,#(0x1<<5)
	str r1,[r0]

//LED1灯初始化
LED1_INIT:
	//设置模式为输出模式
@	0x50006000[21:20]=01
	ldr r0,=0x50006000
	ldr r1,[r0]
	orr r1,r1,#(0x1<<20)
	bic r1,r1,#(0x1<<21)
	str r1,[r0]

	//设置输出类型为推挽输出
@	0x50006004[10]=0
	ldr r0,=0x50006004
	ldr r1,[r0]
	bic r1,r1,#(0x1<<10)
	str r1,[r0]

	//设置输出速率为低速
@	0x50006008[21:20]=00
	ldr r0,=0x50006008
	ldr r1,[r0]
	bic r1,r1,#(0x3<<20)
	str r1,[r0]

	//设置上下拉电阻为不上下拉
@	0x5000600C[21:20]=00
	ldr r0,=0x5000600C
	ldr r1,[r0]
	bic r1,r1,#(0x3<<20)
	str r1,[r0]


//LED2灯初始化
LED2_INIT:
	//设置模式为输出模式
@	0x50007000[21:20]=01
	ldr r0,=0x50007000
	ldr r1,[r0]
	orr r1,r1,#(0x1<<20)
	bic r1,r1,#(0x1<<21)
	str r1,[r0]

	//设置输出类型为推挽输出
@	0x50007004[10]=0
	ldr r0,=0x50007004
	ldr r1,[r0]
	bic r1,r1,#(0x1<<10)
	str r1,[r0]

	//设置输出速率为低速
@	0x50007008[21:20]=00
	ldr r0,=0x50007008
	ldr r1,[r0]
	bic r1,r1,#(0x3<<20)
	str r1,[r0]

	//设置上下拉电阻为不上下拉
@	0x5000700C[21:20]=00
	ldr r0,=0x5000700C
	ldr r1,[r0]
	bic r1,r1,#(0x3<<20)
	str r1,[r0]

//LED3灯初始化
LED3_INIT:
	//设置模式为输出模式
@	0x50006000[17:16]=01
	ldr r0,=0x50006000
	ldr r1,[r0]
	orr r1,r1,#(0x1<<16)
	bic r1,r1,#(0x1<<17)
	str r1,[r0]

	//设置输出类型为推挽输出
@	0x50006004[8]=0
	ldr r0,=0x50006004
	ldr r1,[r0]
	bic r1,r1,#(0x1<<8)
	str r1,[r0]

	//设置输出速率为低速
@	0x50006008[17:16]=00
	ldr r0,=0x50006008
	ldr r1,[r0]
	bic r1,r1,#(0x3<<16)
	str r1,[r0]

	//设置上下拉电阻为不上下拉
@	0x5000600C[17:16]=00
	ldr r0,=0x5000600C
	ldr r1,[r0]
	bic r1,r1,#(0x3<<16)
	str r1,[r0]

@循环函数
loop:
	bl LED1_ON
	bl delay_1s
	bl LED1_OFF
	bl delay_1s
	
	bl LED2_ON
	bl delay_1s
	bl LED2_OFF
	bl delay_1s

	bl LED3_ON
	bl delay_1s
	bl LED3_OFF
	bl delay_1s

	b loop

//LED1灯点亮
LED1_ON:
@	0x50006014[10]=1
	ldr r0,=0x50006014
	ldr r1,[r0]
	orr r1,r1,#(0x1<<10)
	str r1,[r0]
	mov pc,lr

//LED1灯熄灭
LED1_OFF:
	ldr r0,=0x50006014
	ldr r1,[r0]
	bic r1,r1,#(0x1<<10)
	str r1,[r0]
	mov pc,lr

//LED2灯点亮
LED2_ON:
@	0x50007014[10]=1
	ldr r0,=0x50007014
	ldr r1,[r0]
	orr r1,r1,#(0x1<<10)
	str r1,[r0]
	mov pc,lr


//LED2灯熄灭
LED2_OFF:
	ldr r0,=0x50007014
	ldr r1,[r0]
	bic r1,r1,#(0x1<<10)
	str r1,[r0]
	mov pc,lr


//LED3灯点亮
LED3_ON:
@	0x50006014[8]=1
	ldr r0,=0x50006014
	ldr r1,[r0]
	orr r1,r1,#(0x1<<8)
	str r1,[r0]
	mov pc,lr


//LED3灯熄灭
LED3_OFF:
	ldr r0,=0x50006014
	ldr r1,[r0]
	bic r1,r1,#(0x1<<8)
	str r1,[r0]
	mov pc,lr


@ 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

实现现象

2.思维导图