微處理器 - NXP LPC810 - Assembly - Button

參考資訊：
https://www-users.cs.york.ac.uk/~pcc/Circuits/LPC800/data/lpc810.html
https://github.com/microbuilder/LPC810_CodeBase/blob/master/doc/LPC81x%20User%20Manual.pdf

預設PIO0_2是SWDIO


DIR


SET


CLR


main.s

    .cpu cortex-m0
    .thumb

    .equ PINENABLE0, 0x4000c1c0
    .equ GPIO_DIR0,  0xa0002000
    .equ GPIO_PIN0,  0xa0002100
    .equ GPIO_SET0,  0xa0002200
    .equ GPIO_CLR0,  0xa0002280
    .equ BIT1,       1
    .equ BIT2,       2

    .thumb_func
    .global _start
_start:
    .word 0x10000400 @ stacktop
    .word reset @ reset
    .word hang @ nmi
    .word hang @ hardfault
    .word hang @ reserved
    .word hang @ reserved
    .word hang @ reserved
    .word hang @ reserved
    .word hang @ reserved
    .word hang @ reserved
    .word hang @ reserved
    .word hang @ svcall
    .word hang @ reserved
    .word hang @ reserved
    .word hang @ pendsv
    .word hang @ systick
     
    .thumb_func
reset:
    ldr r0, =PINENABLE0
    ldr r1, =0xffffffff
    str r1, [r0]

    ldr r0, =GPIO_DIR0
    ldr r1, =(1 << BIT2)
    str r1, [r0]

loop:
    ldr r0, =GPIO_PIN0
    ldr r1, [r0]
    lsl r1, r1, #1
    str r1, [r0]
    b loop

hang:
    b .
    .end

完成