掌機 - Miyoo - Assembly - Button


參考資料：
http://nano.lichee.pro/
https://mangopi.org/mangopi_r
https://www.allwinnertech.com/index.php?c=product&a=index&pid=4

電路圖


暫存器


main.s 

    .global _start
     
    .equiv GPIO_BASE,  0x01c20800 
     
    .equiv PA,         (0x24 * 0)
    .equiv PE,         (0x24 * 4)
    .equiv PORT_CFG0,  0x00
    .equiv PORT_CFG1,  0x04
    .equiv PORT_DATA,  0x10
    .equiv PORT_PUL0,  0x1c
     
    .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, =GPIO_BASE
    ldr r1, =0x10
    str r1, [r0, #(PA + PORT_CFG0)]
    ldr r1, =0x02
    str r1, [r0, #(PA + PORT_DATA)]
     
    ldr r1, =0x11000011
    str r1, [r0, #(PE + PORT_CFG0)]
    ldr r1, =0x01
    str r1, [r0, #(PE + PORT_CFG1)]
    ldr r1, =~0x380
    str r1, [r0, #(PE + PORT_DATA)]
 
0: 
    ldr r1, [r0, #(PE + PORT_DATA)]
    lsr r1, #1
    str r1, [r0, #(PA + PORT_DATA)]
    b 0b
    .end

完成