微處理器 - Allwinner H3 (NanoPi M1) - Assembly - Button

參考資料：
https://github.com/friendlyarm/u-boot/tree/sunxi-v2017.x/arch/arm/include/asm/arch-sunxi

綠色LED是連接到PL10，按鍵則是連接到PL3


R_GPIO位址


PL_CFG0


PL_CFG1


PL_DATA


PL_PUL0


BUS_CLK_GATING_REG2


main.s

    .global _start

    .equ PRCM,      0x01f01400
    .equ CCU,       0x01c20000
    .equ PIO,       0x01c20800
    .equ R_PIO,     0x01f02c00
    .equ PA_CFG1,   (PIO + (0x24 * 0) + 0x04)
    .equ PA_DATA,   (PIO + (0x24 * 0) + 0x10)
    .equ PL_CFG0,   (R_PIO + (0x24 * 0) + 0x00)
    .equ PL_CFG1,   (R_PIO + (0x24 * 0) + 0x04)
    .equ PL_DATA,   (R_PIO + (0x24 * 0) + 0x10)
    .equ PL_PUL0,   (R_PIO + (0x24 * 0) + 0x1c)

    .equ BUS_CLK_GATING_REG2,  (CCU + 0x68)
    .equ PRCM_APB0_GATE,       (PRCM + 0x28)
    .equ PRCM_APB0_RESET,      (PRCM + 0xb0)
    .equ PRCM_SEC_SWITCH,      (PRCM + 0x1d0)
      
    .arm
    .text
_start:
    .long 0xea000016
    .byte 'e', 'G', 'O', 'N', '.', 'B', 'T', '0'
    .long 0, __spl_size
    .byte 'S', 'P', 'L', 2
    .long 0, 0
    .long 0, 0, 0, 0, 0, 0, 0, 0
    .long 0, 0, 0, 0, 0, 0, 0, 0
  
_vector:
    b reset
    b .
    b .
    b .
    b .
    b .
    b .
    b .

reset:
    ldr r0, =BUS_CLK_GATING_REG2
    ldr r1, [r0]
    orr r1, #(1 << 5)
    str r1, [r0]

    ldr r0, =PRCM_SEC_SWITCH
    ldr r1, =(1 << 2) | (1 << 1) | (1 << 0)
    str r1, [r0]

    ldr r0, =PRCM_APB0_GATE
    ldr r1, [r0]
    orr r1, #(1 << 0)
    str r1, [r0]

    ldr r0, =PRCM_APB0_RESET
    ldr r1, =(1 << 0)
    str r1, [r0]

    ldr r0, =PL_CFG0
    ldr r1, =0x00000000
    str r1, [r0]

    ldr r0, =PL_CFG1
    ldr r1, =0x00000100
    str r1, [r0]

    ldr r0, =PL_PUL0
    ldr r1, =0x00000040
    str r1, [r0]

    ldr r0, =PL_DATA
0:
    ldr r1, [r0]
    lsl r1, #7
    eor r1, #(1 << 10)
    str r1, [r0]
    b 0b
    .end

P.S. 由於沒有PRCM相關文件可以參考，所以司徒從U-Boot把PRCM初始化的部份抄出來

完成