微處理器 - Allwinner F133-A (MangoPi MQ-R) - Assembly - Button

FEL按鍵是連接到SPI0_MOSI



SPI0_MOSI是PC4


GPIO位址


PC_CFG0


PD_DAT


PC_PULL0


main.s

    .global _start
 
    .equ GPIO_BASE, 0x02000000
    .equ PD_CFG2,   0x0098
    .equ PD_DAT,    0x00a0
    .equ PC_CFG0,   0x0060
    .equ PC_DAT,    0x0070
    .equ PC_PULL0,  0x0084
  
    .text
    .long 0x0a00006f
    .byte 'e','G','O','N','.','B','T','0'
    .long 0x5F0A6C39
    .long 0x8000
    .long 0, 0
    .long 0, 0, 0, 0, 0, 0, 0, 0
    .long 0, 0, 0, 0, 0, 0, 0, 0

    .org 0x00a0
_vector:
    j _start
  
    .org 0x0100
_start:
    li t0, 0x00000000
    li a0, GPIO_BASE + PC_CFG0
    sw t0, 0(a0)

    li t0, 0x55555555
    li a0, GPIO_BASE + PC_PULL0
    sw t0, 0(a0)

    li t0, (1 << 24)
    li a0, GPIO_BASE + PD_CFG2
    sw t0, 0(a0)

    li a0, GPIO_BASE + PC_DAT
    li a1, GPIO_BASE + PD_DAT
0:
    lw t0, 0(a0)
    sll t0, t0, 18
    sw t0, 0(a1)
    j 0b
    .end

完成