一、思维导图

二、练习

实现三个灯闪烁

汇编代码

.text 
.global _start
_start: @使能GPIOE和F时钟LDR     r0,=0x50000A28LDR      r1,[R0]ORR     R1,R1,#(0X3<<4)STR      R1,[R0]@配置GPIOE和F的MODER寄存器LDR     r0,=0x50006000   @GPIOELDR     R1,=0X50007000   @GPIOFLDR      R2,[R0]BIC       R2,R2,#(0X3<<20)BIC       R2,R2,#(0X3<<16)ORR     R2,R2,#(0X1<<20)ORR     R2,R2,#(0X1<<16)STR      R2,[R0]LDR      R2,[R1]BIC       R2,R2,#(0X3<<20)ORR     R2,R2,#(0X1<<20)STR      R2,[R1]@配置GPIOE和F的OTYPER寄存器LDR     r0,=0x50006004   @GPIOELDR     R1,=0X50007004   @GPIOFLDR      R2,[R0]BIC       R2,R2,#(0X1<<10)BIC       R2,R2,#(0X1<<8)STR      R2,[R0]LDR      R2,[R1]BIC       R2,R2,#(0X1<<10)STR      R2,[R1]@配置GPIOE和F的OSPEEDR寄存器LDR     r0,=0x50006008   @GPIOELDR     R1,=0X50007008   @GPIOFLDR      R2,[R0].text 
.global _start
_start: @使能GPIOE和F时钟LDR     r0,=0x50000A28LDR      r1,[R0]ORR     R1,R1,#(0X3<<4)STR      R1,[R0]@配置GPIOE和F的MODER寄存器LDR     r0,=0x50006000   @GPIOELDR     R1,=0X50007000   @GPIOFLDR      R2,[R0]BIC       R2,R2,#(0X3<<20)BIC       R2,R2,#(0X3<<16)ORR     R2,R2,#(0X1<<20)ORR     R2,R2,#(0X1<<16)STR      R2,[R0]LDR      R2,[R1]BIC       R2,R2,#(0X3<<20)ORR     R2,R2,#(0X1<<20)STR      R2,[R1]@配置GPIOE和F的OTYPER寄存器LDR     r0,=0x50006004   @GPIOELDR     R1,=0X50007004   @GPIOFLDR      R2,[R0]BIC       R2,R2,#(0X1<<10)BIC       R2,R2,#(0X1<<8)STR      R2,[R0]BIC       R2,R2,#(0X3<<20)BIC       R2,R2,#(0X3<<16)STR      R2,[R0]LDR      R2,[R1]BIC       R2,R2,#(0X3<<20)STR      R2,[R1]@配置GPIOE和F的PUPDR寄存器LDR     r0,=0x5000600C   @GPIOELDR     R1,=0X5000700C   @GPIOFLDR      R2,[R0]BIC       R2,R2,#(0X3<<20)BIC       R2,R2,#(0X3<<16)STR      R2,[R0]LDR      R2,[R1]BIC       R2,R2,#(0X3<<20)STR      R2,[R1]
LOOP:BL  LED_ONBL  DELAYBL  LED_OFFBL  DELAYB  LOOPLED_ON:@GPIOELDR     r0,=0x50006014LDR      r1,[R0]ORR      R1,R1,#(0X1<<10)ORR      R1,R1,#(0X1<<8)STR      R1,[R0]@GPIOFLDR     r0,=0x50007014LDR      r1,[R0]ORR      R1,R1,#(0X1<<10)STR      R1,[R0]MOV PC,LRLED_OFF:@GPIOELDR     R0,=0x50006014LDR      R1,[R0]BIC      R1,R1,#(0X1<<10)BIC      R1,R1,#(0X1<<8)STR      R1,[R0]@GPIOFLDR     r0,=0x50007014LDR      r1,[R0]BIC      R1,R1,#(0X1<<10)STR      R1,[R0]MOV PC,LRDELAY:LDR R3,=0X10000000
MM:CMP R3,#0SUBNE R3,R3,#1BNE MMMOV PC,LR
.end

Makefile 

NAME=asm-led
CROSS_COMPILE = arm-linux-gnueabihf-CC = $(CROSS_COMPILE)gccLD = $(CROSS_COMPILE)ld
OBJCOPY = $(CROSS_COMPILE)objcopy
OBJDUMP = $(CROSS_COMPILE)objdumpall:$(CC) -O0 -g -c $(NAME).S -o $(NAME).o$(LD) -Ttext=0xC0008000 $(NAME).o -o $(NAME).elf $(OBJCOPY) -O binary $(NAME).elf  $(NAME).bin$(OBJDUMP) -D $(NAME).elf > $(NAME).dis
clean:rm -rf *.elf *.bin *.o *.disinstall:sudo cp $(NAME).bin  /mnt/hgfs/share/