GPBCON EQU 0X56000010  ;把地址0x56000010赋给GPBCON
GPBDAT EQU 0X56000014 

AREA RESET,CODE,READONLY
ENTRY

EXPORT __ENTRYa

__ENTRYa

ldr r0,=GPBCON ;r0->GPBCON
ldr r1,=(0x01<<10);
str r1,[r0];把r1写入r0

2
ldr r2,=GPBDAT
ldr r3,= (0x1<<5)
str r3,[r2]


ldr r3,= (0x0<<5)
str r3,[r2]

b %b2 ;开始循环





END

ARM 基础汇编笔记