ARM stm32点灯实验

.text 
.global _start
_start: 
	bl LED1_INIT
	bl LED2_INIT
	bl LED3_INIT
loop:
	
	bl LED1_ON
	bl delay_1s
	bl LED1_OFF

	bl LED2_ON
	bl delay_1s
	bl LED2_OFF

	bl LED3_ON
	bl delay_1s
	bl LED3_OFF

	b loop

LED1_INIT:
	@/**************RCC章节*************/
	@1.通过RCC_MP_AHB4ENSETR寄存器设置GPIOE时钟使能 0x50000A28[4] = 1
	ldr r0,=0x50000A28
	ldr r1,[r0]
	orr r1,r1,#(0x1 << 4)
	str r1,[r0]

	@/**************GPIO章节************/
	@1.通过GPIOE_MODER寄存器设置PE10引脚为输出模式 0x50006000[21:20] = 01
	ldr r0,=0x50006000
	ldr r1,[r0]
	and r1,#(~(0x3 << 20))
	orr r1,#(0x1 << 20)
	str r1,[r0]

	@2.通过GPIOE_OTYPER寄存器设置PE10引脚为推晚输出模式 0x50006004[10] = 0
	ldr r0,=0x50006004
	ldr r1,[r0]
	and r1,#(~(0x1 << 10))
	str r1,[r0]

	@3.通过GPIOE_OSPEEDR寄存器设置PE10引脚为低速输出模式 0x50006008[21:20] = 00
	ldr r0,=0x50006008
	ldr r1,[r0]
	bic r1,#(0x3 << 20)
	str r1,[r0]

	@4.通过GPIOE_PUPDR寄存器设置PE10引脚禁止上下拉电阻 0x5000600C[21:20] = 00
	ldr r0,=0x5000600c
	ldr r1,[r0]
	bic r1,#(0x3 << 20)
	str r1,[r0]
	mov pc, lr

LED1_ON:
	@1.通过GPIOE_ODR寄存器设置PE10引脚输出高电平 0x50006014[10] = 1
	ldr r0,=0x50006014
	ldr r1,[r0]
	orr r1,#(0x1 << 10)
	str r1,[r0]
	mov pc, lr

LED1_OFF:
	@1.通过GPIOE_ODR寄存器设置PE10引脚输出低电平 0x50006014[10] = 0
	ldr r0,=0x50006014
	ldr r1,[r0]
	bic r1,#(0x1 << 10)
	str r1,[r0]
	mov pc, lr
	
LED2_INIT:
	@/**************RCC章节*************/
	@1.通过RCC_MP_AHB4ENSETR寄存器设置GPIOF时钟使能 0x50000A28[5] = 1
	ldr r0,=0x50000A28
	ldr r1,[r0]
	orr r1,r1,#(0x1 << 5)
	str r1,[r0]

	@/**************GPIO章节************/
	@1.通过GPIOE_MODER寄存器设置PF10引脚为输出模式 0x50007000[21:20] = 01
	ldr r0,=0x50007000
	ldr r1,[r0]
	and r1,#(~(0x3 << 20))
	orr r1,#(0x1 << 20)
	str r1,[r0]

	@2.通过GPIOE_OTYPER寄存器设置PF10引脚为推晚输出模式 0x50007004[10] = 0
	ldr r0,=0x50007004
	ldr r1,[r0]
	bic r1,#(0x1 << 10)
	str r1,[r0]

	@3.通过GPIOE_OSPEEDR寄存器设置PF10引脚为低速输出模式 0x50007008[21:20] = 00
	ldr r0,=0x50007008
	ldr r1,[r0]
	bic r1,#(0x3 << 20)
	str r1,[r0]

	@4.通过GPIOE_PUPDR寄存器设置PF10引脚禁止上下拉电阻 0x5000700C[21:20] = 00
	ldr r0,=0x5000700c
	ldr r1,[r0]
	bic r1,#(0x3 << 20)
	str r1,[r0]
	mov pc, lr

LED2_ON:
	@1.通过GPIOE_ODR寄存器设置PF10引脚输出高电平 0x50007014[10] = 1
	ldr r0,=0x50007014
	ldr r1,[r0]
	orr r1,#(0x1 << 10)
	str r1,[r0]
	mov pc, lr

LED2_OFF:
	@1.通过GPIOE_ODR寄存器设置PF10引脚输出低电平 0x50007014[10] = 0
	ldr r0,=0x50007014
	ldr r1,[r0]
	bic r1,#(0x1 << 10)
	str r1,[r0]
	mov pc, lr

LED3_INIT:
	@/**************RCC章节*************/
	@1.通过RCC_MP_AHB4ENSETR寄存器设置GPIOE时钟使能 0x50000A28[4] = 1
	ldr r0,=0x50000A28
	ldr r1,[r0]
	orr r1,r1,#(0x1 << 4)
	str r1,[r0]

	@/**************GPIO章节************/
	@1.通过GPIOE_MODER寄存器设置PE8引脚为输出模式 0x50006000[17:16] = 01
	ldr r0,=0x50006000
	ldr r1,[r0]
	and r1,#(~(0x3 << 16))
	orr r1,#(0x1 << 16)
	str r1,[r0]

	@2.通过GPIOE_OTYPER寄存器设置PE8引脚为推晚输出模式 0x50006004[8] = 0
	ldr r0,=0x50006004
	ldr r1,[r0]
	bic r1,#(0x1 << 8)
	str r1,[r0]

	@3.通过GPIOE_OSPEEDR寄存器设置PE8引脚为低速输出模式 0x50006008[17:16] = 00
	ldr r0,=0x50006008
	ldr r1,[r0]
	bic r1,#(0x3 << 16)
	str r1,[r0]

	@4.通过GPIOE_PUPDR寄存器设置PE8引脚禁止上下拉电阻 0x5000600C[17:16] = 00
	ldr r0,=0x5000600c
	ldr r1,[r0]
	bic r1,#(0x3 << 16)
	str r1,[r0]
	mov pc, lr

LED3_ON:
	@1.通过GPIOE_ODR寄存器设置PE8引脚输出高电平 0x50006014[8] = 1
	ldr r0,=0x50006014
	ldr r1,[r0]
	orr r1,#(0x1 << 8)
	str r1,[r0]
	mov pc, lr

LED3_OFF:
	@1.通过GPIOE_ODR寄存器设置PE8引脚输出低电平 0x50006014[8] = 0
	ldr r0,=0x50006014
	ldr r1,[r0]
	bic 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