TRIMUI >> Assembly

Button

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參考資料：
1. pdf
2. lichee
3. mangopi_r
4. allwinner

按鍵A是接到PD12


暫存器


提昇電阻


main.s

  .global _start
   
  .equiv GPIO_BASE,  0x01c20800 
   
  .equiv PD,         (0x24 * 3)
  .equiv PE,         (0x24 * 4)
  .equiv PORT_CFG0,  0x00
  .equiv PORT_CFG1,  0x04
  .equiv PORT_CFG2,  0x08
  .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, =0x100000
  str r1, [r0, #(PE + PORT_CFG0)]
  ldr r1, =0x20
  str r1, [r0, #(PE + PORT_DATA)]
   
  ldr r1, =0x0000
  str r1, [r0, #(PD + PORT_CFG2)]
  ldr r1, =0x40
  str r1, [r0, #(PD + PORT_PUL0)]
 
0: 
  ldr r1, [r0, #(PD + PORT_DATA)]
  lsr r1, #14
  str r1, [r0, #(PE + PORT_DATA)]
  b 0b
  .end

完成

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