[ARM -- stm32 assembly code lights up LED lights]

ARM -- stm32 assembly code to light up the LED light

Implementation process

Implementation process

Query development manual

Analyzing RCC Chapters

1. Determine the RCC base address
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2. Analyze the RCC_MP_AHB4ENSETR register

1. The function of the RCC_MP_AHB4ENSETR register is to enable the GPIO group-related controller;< /span> 2. Enable the GPIO group and set the fourth bit to one;
2. RCC_MP_AHB4ENSETR address: base address + offset address = 0x5000A28;

Analyzing GPIO Chapter

1. The role of registers
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2. Analysis of each register
Base address + offset address

1. GPIOx_MODER
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Set the PE10 pin to output mode: set [21:20] to 01;
2. GPIOx_OTYPER [10]=1 >>>>The high-level LED is on [10]=0 >>>>The low-level LED is off Set the PE10 pin output high and low frequency: 5. GPIOx_ODR Set the PE10 pin to disable external pull-up and pull-down resistors: set [21: 20] is set to 00; 4. GPIOx_PUPDR Set the PE10 pin to Low-speed output mode: Set [21:20] to 00; 3. GPIOx_OSPEEDR
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Set the PE10 pin to push-pull output type: Set [10] to 0;

Write code

.text 
.global _start
_start: 
	/**********LED1点灯LED1----->PE10/
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,r1,#(~(0x3<<20))
	orr r1,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]
	and 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]
	and r1,#(~(0x3<<20))
	str r1,[r0]

LED2_INIT:
	@1.通过RCC_MP_AHB4ENSETR寄存器设置GPIOE时钟使能 0x50000A28[5] = 1
	ldr r0,=0x50000A28
	ldr r1,[r0]
	orr r1,r1,#(0x1 << 5)
	str r1,[r0]
	@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,r1,#(~(0x3<<20))
	orr r1,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]
	and 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]
	and 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]
	and r1,#(~(0x3<<20))
	str r1,[r0]

LED3_INIT:
	@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]

	@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,r1,#(~(0x3<<16))
	orr r1,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]
	and r1,#(~(0x1<<8))
	str r1,[r0]

	@3.通过GPIOE_OSPEEDR寄存器设置PE10引脚为低速输出模式 0x50006008[17:16] = 00
	ldr r0,=0x50006008
	ldr r1,[r0]
	and r1,#(~(0x3<<16))
	str r1,[r0]
	@4.通过GPIOE_PUPDR寄存器设置PE10引脚禁止上下拉电阻 0x5000600C[17:16] = 00
	ldr r0,=0x5000600C
	ldr r1,[r0]
	and r1,#(~(0x3<<16))
	str r1,[r0]

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_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,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]
	and r1,r1,#(~(0x1<<10))
	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,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]
	and r1,r1,#(~(0x1<<10))
	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,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]
	and 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