LPC2103 >> Assembly

Button

---

參考資料：
1. pdf

暫存器


main.s

  .equ IOPIN, 0xe0028000
  .equ IOSET, 0xe0028004
  .equ IODIR, 0xe0028008
  .equ IOCLR, 0xe002800c

  .text
  .align 2
  .global _start
_start:    b reset
_undef:    b .
_swi:      b .
_pabort:   b .
_dabort:   b .
_reserved: b .
_irq:      b .
_fiq:      b .

reset:
  ldr r0, =IODIR
  ldr r1, =(1 << 22)
  str r1, [r0]
loop:
  ldr r0, =IOPIN
  ldr r0, [r0]
  and r0, #(1 << 14)
  cmp r0, #(1 << 14)
  bne 1f
0:
  ldr r0, =IOCLR
  ldr r1, =(1 << 22)
  str r1, [r0]
  b loop
1:
  ldr r0, =IOSET
  ldr r1, =(1 << 22)
  str r1, [r0]
  b loop
  .end 

完成

返回上一頁