司徒的教學網站

Game Gear Micro

找出LCD初始化代碼

參考資料：
1. gamegearmicrohack

司徒想了想，發現有一個位置可以用來擺放MicroSD

F1C200S左邊是屏的走線，右邊則是用來跳線連接MicroSD，這改機難度屬於中上...

為了方便跳線，司徒先將10uPF、1M電阻拆掉

原本想直接使用MicroSD元件，但是，發現接觸的排針會脫落，需要固定，因此，司徒找來一個肉雞

電宰後...

相當完美的位置

但是，下方是屏的走線，假如先改造MicroSD，這屏的問題可能就很難解

因此，司徒打算先把屏的初始化代碼找出來，於是開始刮線

腳位圖

標示位置

跳線

屏的走線真的蠻細的，需要一點苦工，司徒一想到後面的MicroSD跳線，有種想哭的感覺...

寨機邏輯分析儀上場

由上而下分別是：CS、RD、RS、WR、PD0、DB0~DB7、PD8，從這個圖，得到四個資訊：
1. 屏的驅動方式是MCU方式(i80)
2. 屏有TE腳位(Screen Tearing)
3. PD0是TE腳位
4. PD8是RESET腳位

TE腳位剛好是60Hz，代表這個屏的顯示可以達60FPS，相當不錯的屏

邏輯分析儀取得的資料

0.000000000,1,1,1,0,0,0,0,0,0,0,0,1
0.000002600,1,1,1,0,0,0,0,0,0,0,0,0
0.000003200,1,1,1,0,0,0,0,0,0,0,0,1
0.110548360,1,1,1,0,0,0,0,0,0,0,0,0
0.220564240,1,1,1,0,0,0,0,0,0,0,0,1
0.230566400,1,1,1,0,0,0,0,0,0,0,0,0
0.240566320,1,1,1,0,0,0,0,0,0,0,0,1
0.340535600,0,0,1,0,0,0,1,0,0,0,1,1
0.340535640,0,0,0,0,0,0,1,0,0,0,1,1
0.340535680,0,0,1,0,0,0,1,0,0,0,1,1
0.340535720,1,1,1,0,0,0,0,0,0,0,0,1
0.460496120,0,0,0,0,0,1,1,0,1,1,0,1
0.460496200,1,1,1,0,0,0,0,0,0,0,0,1
0.460598320,0,1,0,0,0,0,0,1,1,0,0,1
0.460598400,1,1,1,0,0,0,0,0,0,0,0,1
0.460699800,0,0,1,0,0,0,0,1,0,0,0,1
0.460699840,0,0,0,0,0,1,1,1,1,0,0,1
0.460699880,0,0,1,0,0,1,1,1,1,0,0,1
0.460699920,1,1,1,0,0,0,0,0,0,0,0,1
0.460801720,0,1,1,0,0,0,0,0,0,1,1,1
0.460801760,0,1,0,0,0,0,0,0,0,1,1,1
0.460801800,0,1,1,0,0,0,0,0,0,1,1,1
0.460801840,1,1,1,0,0,0,0,0,0,0,0,1
0.460902760,0,0,0,0,0,1,1,0,0,1,0,1
0.460902840,1,1,1,0,0,0,0,0,0,0,0,1
0.461004640,0,0,1,0,0,1,1,0,0,1,1,1
0.461004680,0,0,0,0,0,1,1,0,0,1,1,1
0.461004720,0,0,1,0,0,1,1,0,0,1,1,1
0.461004760,1,1,1,0,0,0,0,0,0,0,0,1
0.461105680,0,1,1,0,0,0,0,0,0,0,0,1
0.461105720,0,1,0,0,0,0,0,0,0,0,0,1
0.461105760,1,1,1,0,0,0,0,0,0,0,0,1
0.461206600,0,0,1,1,0,1,1,0,1,0,0,1
0.461206640,0,0,0,1,0,1,1,0,1,0,0,1
0.461206680,0,0,1,1,0,1,1,0,1,0,0,1
0.461206720,1,1,1,0,0,0,0,0,0,0,0,1
0.461308600,0,1,1,0,0,0,0,1,0,1,0,1
0.461308640,0,1,0,0,0,0,0,1,0,1,0,1
0.461308680,0,1,1,0,0,0,0,1,0,1,0,1
0.461308720,1,1,1,0,0,0,0,0,0,0,0,1
0.461409520,0,1,1,0,0,0,0,0,0,0,0,1
0.461409560,0,1,0,0,0,0,0,1,0,1,0,1
0.461409600,0,1,1,0,0,0,0,1,0,1,0,1
0.461409640,1,1,1,0,0,0,0,0,0,0,0,1
0.461510560,0,1,1,0,0,0,0,0,0,0,0,1
0.461510600,0,1,0,0,0,0,0,0,0,0,0,1
0.461510640,0,1,1,0,0,0,0,0,0,0,0,1
0.461510680,1,1,1,0,0,0,0,0,0,0,0,1
0.461612480,0,1,0,0,0,1,1,0,1,0,1,1
0.461612560,1,1,1,0,0,0,0,0,0,0,0,1
0.461713480,0,1,1,0,0,1,0,0,1,0,1,1
0.461713520,0,1,0,0,0,1,1,0,1,0,1,1
0.461713560,0,1,1,0,0,1,1,0,1,0,1,1
0.461713600,1,1,1,0,0,0,0,0,0,0,0,1
0.461815400,0,0,1,1,0,1,1,0,1,1,1,1
0.461815440,0,0,0,1,0,1,1,0,1,1,1,1
0.461815480,1,1,1,1,0,1,0,0,0,0,0,1
0.461815520,1,1,1,0,0,0,0,0,0,0,0,1
0.461916440,0,1,0,0,0,0,0,0,1,0,0,1
0.461916520,1,1,1,0,0,0,0,0,0,0,0,1
0.462017360,0,0,1,1,0,1,1,1,1,0,1,1
0.462017400,0,0,0,1,0,1,1,1,1,0,1,1
0.462017440,1,1,1,0,0,0,0,0,0,0,0,1
0.462119360,0,1,1,0,0,1,1,0,0,0,0,1
0.462119400,0,1,0,0,0,1,1,0,0,0,0,1
0.462119440,1,1,1,0,0,1,0,0,0,0,0,1
0.462119480,1,1,1,0,0,0,0,0,0,0,0,1
0.462220280,0,0,1,1,1,0,0,0,0,0,0,1
0.462220320,0,0,0,1,1,0,0,0,0,0,0,1
0.462220360,0,0,1,1,1,0,0,0,0,0,0,1
0.462220400,1,1,1,0,0,0,0,0,0,0,0,1
0.462321200,0,1,1,0,0,1,0,1,0,1,0,1
0.462321240,0,1,0,0,0,1,0,1,0,1,0,1
0.462321280,0,1,1,0,0,1,0,1,0,1,0,1
0.462321320,1,1,1,0,0,0,0,0,0,0,0,1
0.462422240,0,0,1,1,1,0,0,0,1,0,0,1
0.462422280,0,0,0,1,1,0,0,0,1,0,0,1
0.462422320,1,1,1,1,1,0,0,0,1,0,0,1
0.462422360,1,1,1,0,0,0,0,0,0,0,0,1
0.462523160,0,1,1,0,0,0,0,0,0,0,1,1
0.462523200,0,1,0,0,0,0,0,0,0,0,1,1
0.462523240,0,1,1,0,0,0,0,0,0,0,1,1
0.462523280,1,1,1,0,0,0,0,0,0,0,0,1
0.462624200,0,0,1,1,1,0,0,0,1,0,1,1
0.462624240,0,0,0,1,1,0,0,0,1,0,1,1
0.462624280,1,1,1,0,0,0,0,0,0,0,0,1
0.462725120,0,1,1,0,0,0,1,0,1,1,1,1
0.462725160,0,1,0,0,0,0,1,0,1,1,1,1
0.462725200,0,1,1,0,0,0,1,0,1,1,1,1
0.462725240,1,1,1,0,0,0,0,0,0,0,0,1
0.462826040,0,0,1,1,1,0,0,0,0,1,0,1
0.462826080,0,0,0,1,1,0,0,0,0,1,0,1
0.462826120,0,0,1,1,1,0,0,0,0,1,0,1
0.462826160,1,1,1,0,0,0,0,0,0,0,0,1
0.462927960,0,1,1,0,0,1,0,0,0,0,0,1
0.462928000,0,1,0,0,0,1,0,0,0,0,0,1
0.462928040,1,1,1,0,0,0,0,0,0,0,0,1
0.463029000,0,0,0,1,1,0,0,0,1,1,0,1
0.463029080,1,1,1,0,0,0,0,0,0,0,0,1
0.463130000,0,1,1,0,0,0,0,1,1,1,1,1
0.463130040,0,1,0,0,0,0,0,1,1,1,1,1
0.463130080,0,1,1,0,0,0,0,1,1,1,1,1
0.463130120,1,1,1,0,0,0,0,0,0,0,0,1
0.463231920,0,0,1,1,1,0,1,0,0,0,0,1
0.463231960,0,0,0,1,1,0,1,0,0,0,0,1
0.463232000,1,1,1,0,0,0,0,0,0,0,0,1
0.463332960,0,1,0,1,0,1,0,0,0,1,0,1
0.463333000,0,1,1,1,0,1,0,0,0,1,0,1
0.463333040,1,1,1,0,0,0,0,0,0,0,0,1
0.463434840,0,1,1,1,0,1,0,0,0,0,1,1
0.463434880,0,1,0,1,0,1,0,0,0,0,1,1
0.463434920,0,1,1,1,0,1,0,0,0,0,1,1
0.463434960,1,1,1,0,0,0,0,0,0,0,0,1
0.463535760,0,0,1,1,1,0,1,0,1,1,0,1
0.463535800,0,0,0,1,1,0,1,0,1,1,0,1
0.463535840,0,0,1,1,1,0,1,0,1,1,0,1
0.463535880,1,1,1,0,0,0,0,0,0,0,0,1
0.463636800,0,1,1,1,0,1,0,0,0,0,1,1
0.463636840,0,1,0,1,0,1,0,0,0,0,1,1
0.463636880,1,1,1,0,0,1,0,0,0,0,0,1
0.463636920,1,1,1,0,0,0,0,0,0,0,0,1
0.463738720,0,0,0,1,1,1,0,0,0,0,0,1
0.463738800,1,1,1,0,0,0,0,0,0,0,0,1
0.463839720,0,1,1,1,1,0,1,0,0,0,0,1
0.463839760,0,1,0,1,1,0,1,0,0,0,0,1
0.463839800,0,1,1,1,1,0,1,0,0,0,0,1
0.463839840,1,1,1,0,0,0,0,0,0,0,0,1
0.463940760,0,1,1,0,0,0,0,0,0,1,0,1
0.463940800,0,1,0,0,0,0,0,0,0,1,0,1
0.463940840,1,1,1,0,0,0,0,0,0,0,0,1
0.464042680,0,1,0,0,0,0,0,1,0,1,0,1
0.464042720,0,1,1,0,0,0,0,1,0,1,0,1
0.464042760,1,1,1,0,0,0,0,0,0,0,0,1
0.464143680,0,1,1,0,0,0,1,0,0,0,1,1
0.464143720,0,1,0,0,0,0,1,0,0,0,1,1
0.464143760,0,1,1,0,0,0,1,0,0,0,1,1
0.464143800,1,1,1,0,0,0,0,0,0,0,0,1
0.464245600,0,1,1,0,0,0,1,0,1,0,1,1
0.464245640,0,1,0,0,0,0,1,0,1,0,1,1
0.464245680,1,1,1,0,0,0,0,0,0,0,0,1
0.464346520,0,1,1,0,0,1,0,1,0,1,0,1
0.464346560,0,1,0,0,0,1,0,1,0,1,0,1
0.464346600,1,1,1,0,0,1,0,0,0,0,0,1
0.464346640,1,1,1,0,0,0,0,0,0,0,0,1
0.464447560,0,1,0,0,0,1,1,1,1,0,1,1
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0.464549480,0,1,0,0,1,0,1,0,0,1,1,1
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0.464953400,0,1,0,0,0,0,0,1,1,0,1,1
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0.465054280,0,1,1,0,0,0,1,1,1,1,1,1
0.465054320,0,1,0,0,0,0,1,1,1,1,1,1
0.465054360,0,1,1,0,0,0,1,1,1,1,1,1
0.465054400,1,1,1,0,0,0,0,0,0,0,0,1
0.465155200,0,1,1,0,0,1,0,0,0,0,1,1
0.465155240,0,1,0,0,0,1,0,0,1,0,1,1
0.465155280,0,1,1,0,0,1,0,0,1,0,1,1
0.465155320,1,1,1,0,0,0,0,0,0,0,0,1
0.465256240,0,0,1,1,1,1,0,0,0,0,1,1
0.465256280,0,0,0,1,1,1,0,0,0,0,1,1
0.465256320,0,0,1,1,1,1,0,0,0,0,1,1
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0.467181600,0,1,1,0,0,0,0,0,0,0,0,1
0.467181640,0,1,0,0,0,0,0,0,0,0,0,1
0.467181680,1,1,1,0,0,0,0,0,0,0,0,1
0.467283520,0,1,0,1,1,1,0,1,1,1,1,1
0.467283560,0,1,1,1,1,1,0,1,1,1,1,1
0.467283600,1,1,1,0,0,0,0,0,0,0,0,1
0.467384520,0,0,1,0,0,1,0,1,1,0,1,1
0.467384560,0,0,0,0,0,1,0,1,1,0,1,1
0.467384600,0,0,1,0,0,1,0,1,1,0,1,1
0.467384640,1,1,1,0,0,0,0,0,0,0,0,1
0.467486440,0,1,1,0,0,0,0,0,0,0,0,1
0.467486480,0,1,0,0,0,0,0,0,0,0,0,1
0.467486520,1,1,1,0,0,0,0,0,0,0,0,1
0.467587440,0,1,1,0,0,0,0,0,0,0,0,1
0.467587480,0,1,0,0,0,0,0,0,0,0,0,1
0.467587520,0,1,1,0,0,0,0,0,0,0,0,1
0.467587560,1,1,1,0,0,0,0,0,0,0,0,1
0.467688480,0,1,1,0,0,0,0,0,0,0,0,1
0.467688520,0,1,0,0,0,0,0,0,0,0,0,1
0.467688560,0,1,1,0,0,0,0,0,0,0,0,1
0.467688600,1,1,1,0,0,0,0,0,0,0,0,1
0.467790400,0,1,0,1,1,1,0,1,1,1,1,1
0.467790480,1,1,1,0,0,0,0,0,0,0,0,1
0.467891400,0,0,1,0,0,0,0,0,0,0,0,1
0.467891440,0,0,0,0,0,0,0,0,0,0,0,1
0.467891480,0,0,1,0,0,0,0,0,0,0,0,1
0.467891520,1,1,1,0,0,0,0,0,0,0,0,1
0.467992360,0,0,0,0,0,1,0,1,0,0,1,1
0.467992440,1,1,1,0,0,0,0,0,0,0,0,1
0.587952560,0,0,0,0,0,1,0,1,0,1,0,1
0.587952640,1,1,1,0,0,0,0,0,0,0,0,1
0.588053280,0,0,1,0,0,1,0,1,0,1,0,1
0.588053320,0,0,0,0,0,1,0,1,0,1,0,1
0.588053360,1,1,1,0,0,1,0,0,0,0,0,1

司徒寫了一隻Python用來解資料

#!/usr/bin/python
import os
import sys

f = open('digital.csv')
c = f.readlines()
f.close()

for x in c:
  l = x.replace('\r', '').replace('\n', '').split(',')
  t0 = l[0]
  cs = l[1]
  rs = l[2]
  wr = l[3]
  db = '0x%02x' % int(''.join('{:x}'.format(int(v)) for v in l[4:12]), 2)
  rst = l[12]

  if cs == '0' and wr == '0':
    if rs == '0':
      print 'CMD:{}'.format(db)
    else:
      print 'DAT:{}'.format(db)

解譯後的屏初始化資料

CMD:0x11
CMD:0x36
DAT:0x0c
CMD:0x3c
DAT:0x03
CMD:0x32
CMD:0x33
DAT:0x00
CMD:0xb4
DAT:0x0a
DAT:0x0a
DAT:0x00
DAT:0x35
DAT:0x35
CMD:0xb7
DAT:0x04
CMD:0xbd
DAT:0x30
CMD:0xc0
DAT:0x2a
CMD:0xc4
DAT:0x01
CMD:0xc5
DAT:0x17
CMD:0xc2
DAT:0x20
CMD:0xc6
DAT:0x0f
CMD:0xd0
DAT:0xa2
DAT:0xa1
CMD:0xd6
DAT:0xa1
CMD:0xe0
DAT:0xd0
DAT:0x02
DAT:0x0a
DAT:0x11
DAT:0x15
DAT:0x2a
DAT:0x3d
DAT:0x53
DAT:0x42
DAT:0x16
DAT:0x0b
DAT:0x0d
DAT:0x1f
DAT:0x25
CMD:0xe1
DAT:0xd0
DAT:0x02
DAT:0x0d
DAT:0x10
DAT:0x15
DAT:0x2a
DAT:0x3c
DAT:0x42
DAT:0x51
DAT:0x26
DAT:0x1f
DAT:0x1f
DAT:0x20
DAT:0x25
CMD:0x21
CMD:0x2c
DAT:0x00
DAT:0x00
DAT:0x00
DAT:0xef
CMD:0x2d
DAT:0x00
DAT:0x00
DAT:0x00
DAT:0xef
CMD:0x00
CMD:0x29
CMD:0x2a
CMD:0x2a

main.s

  .global _start
   
  .equiv PIO_BASE,  0x01c20800 
  .equiv PA,        (0x24 * 0)
  .equiv PB,        (0x24 * 1)
  .equiv PC,        (0x24 * 2)
  .equiv PD,        (0x24 * 3)
  .equiv PE,        (0x24 * 4)
  .equiv PIO_CFG0,  0x00
  .equiv PIO_CFG1,  0x04
  .equiv PIO_CFG2,  0x08
  .equiv PIO_DATA,  0x10
 
  .equiv LCD_CS,    (1 << 21)
  .equiv LCD_RD,    (1 << 20)
  .equiv LCD_RS,    (1 << 19)
  .equiv LCD_WR,    (1 << 18)
  .equiv LCD_RST,   (1 << 0)
 
  .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 r4, =PIO_BASE + PD
  ldr r1, =0x11111111
  str r1, [r4, #PIO_CFG0]
  str r1, [r4, #PIO_CFG1]
  str r1, [r4, #PIO_CFG2]
  
  ldr r4, =PIO_BASE + PE
  ldr r1, =0x11111111
  str r1, [r4, #PIO_CFG0]
  str r1, [r4, #PIO_CFG1]
  str r1, [r4, #PIO_CFG2]
 
  ldr r4, =PIO_BASE + PD
  ldr r1, =0xffffffff
  str r1, [r4, #PIO_DATA]
 
  ldr r4, =PIO_BASE + PE
  ldr r1, =0xffffffff
  str r1, [r4, #PIO_DATA]
 
  bl lcd_rst

  ldr r0, =0x11
  bl lcd_cmd
  ldr r0, =0x36
  bl lcd_cmd
  ldr r1, =0x0c
  bl lcd_dat
  ldr r0, =0x3c
  bl lcd_cmd
  ldr r1, =0x03
  bl lcd_dat
  ldr r0, =0x32
  bl lcd_cmd
  ldr r0, =0x33
  bl lcd_cmd
  ldr r1, =0x00
  bl lcd_dat
  ldr r0, =0xb4
  bl lcd_cmd
  ldr r1, =0x0a
  bl lcd_dat
  ldr r1, =0x0a
  bl lcd_dat
  ldr r1, =0x00
  bl lcd_dat
  ldr r1, =0x35
  bl lcd_dat
  ldr r1, =0x35
  bl lcd_dat
  ldr r0, =0xb7
  bl lcd_cmd
  ldr r1, =0x04
  bl lcd_dat
  ldr r0, =0xbd
  bl lcd_cmd
  ldr r1, =0x30
  bl lcd_dat
  ldr r0, =0xc0
  bl lcd_cmd
  ldr r1, =0x2a
  bl lcd_dat
  ldr r0, =0xc4
  bl lcd_cmd
  ldr r1, =0x01
  bl lcd_dat
  ldr r0, =0xc5
  bl lcd_cmd
  ldr r1, =0x17
  bl lcd_dat
  ldr r0, =0xc2
  bl lcd_cmd
  ldr r1, =0x20
  bl lcd_dat
  ldr r0, =0xc6
  bl lcd_cmd
  ldr r1, =0x0f
  bl lcd_dat
  ldr r0, =0xd0
  bl lcd_cmd
  ldr r1, =0xa2
  bl lcd_dat
  ldr r1, =0xa1
  bl lcd_dat
  ldr r0, =0xd6
  bl lcd_cmd
  ldr r1, =0xa1
  bl lcd_dat
  ldr r0, =0xe0
  bl lcd_cmd
  ldr r1, =0xd0
  bl lcd_dat
  ldr r1, =0x02
  bl lcd_dat
  ldr r1, =0x0a
  bl lcd_dat
  ldr r1, =0x11
  bl lcd_dat
  ldr r1, =0x15
  bl lcd_dat
  ldr r1, =0x2a
  bl lcd_dat
  ldr r1, =0x3d
  bl lcd_dat
  ldr r1, =0x53
  bl lcd_dat
  ldr r1, =0x42
  bl lcd_dat
  ldr r1, =0x16
  bl lcd_dat
  ldr r1, =0x0b
  bl lcd_dat
  ldr r1, =0x0d
  bl lcd_dat
  ldr r1, =0x1f
  bl lcd_dat
  ldr r1, =0x25
  bl lcd_dat
  ldr r0, =0xe1
  bl lcd_cmd
  ldr r1, =0xd0
  bl lcd_dat
  ldr r1, =0x02
  bl lcd_dat
  ldr r1, =0x0d
  bl lcd_dat
  ldr r1, =0x10
  bl lcd_dat
  ldr r1, =0x15
  bl lcd_dat
  ldr r1, =0x2a
  bl lcd_dat
  ldr r1, =0x3c
  bl lcd_dat
  ldr r1, =0x42
  bl lcd_dat
  ldr r1, =0x51
  bl lcd_dat
  ldr r1, =0x26
  bl lcd_dat
  ldr r1, =0x1f
  bl lcd_dat
  ldr r1, =0x1f
  bl lcd_dat
  ldr r1, =0x20
  bl lcd_dat
  ldr r1, =0x25
  bl lcd_dat
  ldr r0, =0x21
  bl lcd_cmd
  ldr r0, =0x2c
  bl lcd_cmd
  ldr r1, =0x00
  bl lcd_dat
  ldr r1, =0x00
  bl lcd_dat
  ldr r1, =0x00
  bl lcd_dat
  ldr r1, =0xef
  bl lcd_dat
  ldr r0, =0x2d
  bl lcd_cmd
  ldr r1, =0x00
  bl lcd_dat
  ldr r1, =0x00
  bl lcd_dat
  ldr r1, =0x00
  bl lcd_dat
  ldr r1, =0xef
  bl lcd_dat
  ldr r0, =0x00
  bl lcd_cmd
  ldr r0, =0x29
  bl lcd_cmd
  ldr r0, =0x2a
  bl lcd_cmd
  ldr r0, =0x2a
  bl lcd_cmd

  ldr r4, =240*180
  ldr r5, =0xffff
0:
  lsr r0, r5, #8
  bl lcd_dat
  mov r0, r5
  bl lcd_dat
  subs r4, #1
  bne 0b

loop:
  b loop

delay:
  push {lr}
0:
  subs r0, #1
  bne 0b
  pop {pc}
 
lcd_rst:
  push {r4, r5, lr}
  ldr r4, =PIO_BASE + PD
  ldr r5, =0xffffffff
 
  bic r5, #LCD_RST
  str r5, [r4, #PIO_DATA]
  ldr r0, =10000
  bl delay
 
  orr r5, #LCD_RST
  str r5, [r4, #PIO_DATA]
  ldr r0, =10000
  bl delay
  pop {r4, r5, pc}
 
lcd_wr:
  push {r4, r5, lr}
  ldr r4, =PIO_BASE + PD

  and r0, #0xff
  lsl r0, #1
  mov r5, r0
  orr r5, r1
  orr r5, #LCD_RST
  orr r5, #LCD_RD
  str r5, [r4, #PIO_DATA]
 
  orr r5, #LCD_WR
  str r5, [r4, #PIO_DATA]
  pop {r4, r5, pc}
 
lcd_dat:
  push {lr}
  mov r1, #LCD_RS
  bl lcd_wr
  pop {pc}
 
lcd_cmd:
  push {lr}
  mov r1, #0
  bl lcd_wr
  pop {pc}
  .end

main.ld

OUTPUT_FORMAT("elf32-littlearm", "elf32-bigarm", "elf32-littlearm")
OUTPUT_ARCH(arm)
ENTRY(_start)

MEMORY {
  ram : ORIGIN = 0x00000000, LENGTH = 32M
}

SECTIONS {
  .text :
  {
    PROVIDE(__spl_start = .);
    *(.text*)
    PROVIDE(__spl_end = .);
    *(.init.text)
    *(.exit.text)
    *(.glue*)
    *(.note.gnu.build-id)
  } > ram
  PROVIDE(__spl_size = __spl_end - __spl_start);

  .rodata ALIGN(8) :
  {
    PROVIDE(__rodata_start = .);
    *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*)))
    PROVIDE(__rodata_end = .);
  } > ram

  .data ALIGN(8) :
  {
    PROVIDE(__data_start = .);  
    *(.data*)
    . = ALIGN(8);
      PROVIDE(__data_end = .);
    PROVIDE(__image_end = .);
  } > ram

  .bss ALIGN(8) (NOLOAD) :
  {
    PROVIDE(__bss_start = .);
    *(.bss*)
    *(.sbss*)
    *(COMMON)
    . = ALIGN(8);
    PROVIDE(__bss_end = .);
  } > ram

  .stab 0 : { *(.stab) }
  .stabstr 0 : { *(.stabstr) }
  .stab.excl 0 : { *(.stab.excl) }
  .stab.exclstr 0 : { *(.stab.exclstr) }
  .stab.index 0 : { *(.stab.index) }
  .stab.indexstr 0 : { *(.stab.indexstr) }
  .comment 0 : { *(.comment) }
  .debug_abbrev 0 : { *(.debug_abbrev) }
  .debug_info 0 : { *(.debug_info) }
  .debug_line 0 : { *(.debug_line) }
  .debug_pubnames 0 : { *(.debug_pubnames) }
  .debug_aranges 0 : { *(.debug_aranges) }
}

Makefile

all:
	arm-none-eabi-as -mcpu=arm9 -o main.o main.s
	arm-none-eabi-ld -T main.ld -o main.elf main.o
	arm-none-eabi-objcopy -O binary main.elf main.bin
	gcc mksunxi.c -o mksunxi
	./mksunxi main.bin

ram:
	sunxi-fel -p write 0 main.bin && sunxi-fel exec 0

clean:
	rm -rf main.bin main.o main.elf

進入下載模式

編譯下載

$ make
  arm-none-eabi-as -mcpu=arm9 -o main.o main.s
  arm-none-eabi-ld -T main.ld -o main.elf main.o
  arm-none-eabi-objcopy -O binary main.elf main.bin
  gcc mksunxi.c -o mksunxi
  ./mksunxi main.bin
  The bootloader head has been fixed, spl size is 1024 bytes.

$ make ram
  sunxi-fel -p write 0 main.bin && sunxi-fel exec 0
  100% [================================================]     1 kB,  167.0 kB/s

這...，讓司徒又陷入難點，應該是要顯示全白才對，從這個畫面顯示結果，代表屏初始化有問題，經過幾番查找，司徒發現一般屏的最後一道命令應該是0x2C，而且設定位址的命令一般是0x2A、0x2B，因此，比對了一下，司徒應該是記錯DB1和DB2的位置，導致解析錯誤

修正DB1和DB2

#!/usr/bin/python
import os
import sys

f = open('digital.csv')
c = f.readlines()
f.close()

for x in c:
  l = x.replace('\r', '').replace('\n', '').split(',')
  t0 = l[0]
  cs = l[1]
  rs = l[2]
  wr = l[3]
  t = l[9]
  l[9] = l[10]
  l[10] = t
  db = '0x%02x' % int(''.join('{:x}'.format(int(v)) for v in l[4:12]), 2)
  rst = l[12]

  if cs == '0' and wr == '0':
    if rs == '0':
      print 'CMD:{}'.format(db)
    else:
      print 'DAT:{}'.format(db)

最後一道命令是0x2C了～

CMD:0x11
CMD:0x36
DAT:0x0a
CMD:0x3a
DAT:0x05
CMD:0x34
CMD:0x35
DAT:0x00
CMD:0xb2
DAT:0x0c
DAT:0x0c
DAT:0x00
DAT:0x33
DAT:0x33
CMD:0xb7
DAT:0x02
CMD:0xbb
DAT:0x30
CMD:0xc0
DAT:0x2c
CMD:0xc2
DAT:0x01
CMD:0xc3
DAT:0x17
CMD:0xc4
DAT:0x20
CMD:0xc6
DAT:0x0f
CMD:0xd0
DAT:0xa4
DAT:0xa1
CMD:0xd6
DAT:0xa1
CMD:0xe0
DAT:0xd0
DAT:0x04
DAT:0x0c
DAT:0x11
DAT:0x13
DAT:0x2c
DAT:0x3b
DAT:0x55
DAT:0x44
DAT:0x16
DAT:0x0d
DAT:0x0b
DAT:0x1f
DAT:0x23
CMD:0xe1
DAT:0xd0
DAT:0x04
DAT:0x0b
DAT:0x10
DAT:0x13
DAT:0x2c
DAT:0x3a
DAT:0x44
DAT:0x51
DAT:0x26
DAT:0x1f
DAT:0x1f
DAT:0x20
DAT:0x23
CMD:0x21
CMD:0x2a
DAT:0x00
DAT:0x00
DAT:0x00
DAT:0xef
CMD:0x2b
DAT:0x00
DAT:0x00
DAT:0x00
DAT:0xef
CMD:0x00
CMD:0x29
CMD:0x2c
CMD:0x2c

main.s

  .global _start
   
  .equiv PIO_BASE,  0x01c20800 
  .equiv PA,        (0x24 * 0)
  .equiv PB,        (0x24 * 1)
  .equiv PC,        (0x24 * 2)
  .equiv PD,        (0x24 * 3)
  .equiv PE,        (0x24 * 4)
  .equiv PIO_CFG0,  0x00
  .equiv PIO_CFG1,  0x04
  .equiv PIO_CFG2,  0x08
  .equiv PIO_DATA,  0x10
 
  .equiv LCD_CS,    (1 << 21)
  .equiv LCD_RD,    (1 << 20)
  .equiv LCD_RS,    (1 << 19)
  .equiv LCD_WR,    (1 << 18)
  .equiv LCD_RST,   (1 << 0)
 
  .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 r4, =PIO_BASE + PD
  ldr r1, =0x11111111
  str r1, [r4, #PIO_CFG0]
  str r1, [r4, #PIO_CFG1]
  str r1, [r4, #PIO_CFG2]
  
  ldr r4, =PIO_BASE + PE
  ldr r1, =0x11111111
  str r1, [r4, #PIO_CFG0]
  str r1, [r4, #PIO_CFG1]
  str r1, [r4, #PIO_CFG2]
 
  ldr r4, =PIO_BASE + PD
  ldr r1, =0xffffffff
  str r1, [r4, #PIO_DATA]
 
  ldr r4, =PIO_BASE + PE
  ldr r1, =0xffffffff
  str r1, [r4, #PIO_DATA]
 
  bl lcd_rst

  ldr r0, =0x11
  bl lcd_cmd
  ldr r0, =0x36
  bl lcd_cmd
  ldr r0, =0x0a
  bl lcd_dat
  ldr r0, =0x3a
  bl lcd_cmd
  ldr r0, =0x05
  bl lcd_dat
  ldr r0, =0x34
  bl lcd_cmd
  ldr r0, =0x35
  bl lcd_cmd
  ldr r0, =0x00
  bl lcd_dat
  ldr r0, =0xb2
  bl lcd_cmd
  ldr r0, =0x0c
  bl lcd_dat
  ldr r0, =0x0c
  bl lcd_dat
  ldr r0, =0x00
  bl lcd_dat
  ldr r0, =0x33
  bl lcd_dat
  ldr r0, =0x33
  bl lcd_dat
  ldr r0, =0xb7
  bl lcd_cmd
  ldr r0, =0x02
  bl lcd_dat
  ldr r0, =0xbb
  bl lcd_cmd
  ldr r0, =0x30
  bl lcd_dat
  ldr r0, =0xc0
  bl lcd_cmd
  ldr r0, =0x2c
  bl lcd_dat
  ldr r0, =0xc2
  bl lcd_cmd
  ldr r0, =0x01
  bl lcd_dat
  ldr r0, =0xc3
  bl lcd_cmd
  ldr r0, =0x17
  bl lcd_dat
  ldr r0, =0xc4
  bl lcd_cmd
  ldr r0, =0x20
  bl lcd_dat
  ldr r0, =0xc6
  bl lcd_cmd
  ldr r0, =0x0f
  bl lcd_dat
  ldr r0, =0xd0
  bl lcd_cmd
  ldr r0, =0xa4
  bl lcd_dat
  ldr r0, =0xa1
  bl lcd_dat
  ldr r0, =0xd6
  bl lcd_cmd
  ldr r0, =0xa1
  bl lcd_dat
  ldr r0, =0xe0
  bl lcd_cmd
  ldr r0, =0xd0
  bl lcd_dat
  ldr r0, =0x04
  bl lcd_dat
  ldr r0, =0x0c
  bl lcd_dat
  ldr r0, =0x11
  bl lcd_dat
  ldr r0, =0x13
  bl lcd_dat
  ldr r0, =0x2c
  bl lcd_dat
  ldr r0, =0x3b
  bl lcd_dat
  ldr r0, =0x55
  bl lcd_dat
  ldr r0, =0x44
  bl lcd_dat
  ldr r0, =0x16
  bl lcd_dat
  ldr r0, =0x0d
  bl lcd_dat
  ldr r0, =0x0b
  bl lcd_dat
  ldr r0, =0x1f
  bl lcd_dat
  ldr r0, =0x23
  bl lcd_dat
  ldr r0, =0xe1
  bl lcd_cmd
  ldr r0, =0xd0
  bl lcd_dat
  ldr r0, =0x04
  bl lcd_dat
  ldr r0, =0x0b
  bl lcd_dat
  ldr r0, =0x10
  bl lcd_dat
  ldr r0, =0x13
  bl lcd_dat
  ldr r0, =0x2c
  bl lcd_dat
  ldr r0, =0x3a
  bl lcd_dat
  ldr r0, =0x44
  bl lcd_dat
  ldr r0, =0x51
  bl lcd_dat
  ldr r0, =0x26
  bl lcd_dat
  ldr r0, =0x1f
  bl lcd_dat
  ldr r0, =0x1f
  bl lcd_dat
  ldr r0, =0x20
  bl lcd_dat
  ldr r0, =0x23
  bl lcd_dat
  ldr r0, =0x21
  bl lcd_cmd
  ldr r0, =0x2a
  bl lcd_cmd
  ldr r0, =0x00
  bl lcd_dat
  ldr r0, =0x00
  bl lcd_dat
  ldr r0, =0x00
  bl lcd_dat
  ldr r0, =0xef
  bl lcd_dat
  ldr r0, =0x2b
  bl lcd_cmd
  ldr r0, =0x00
  bl lcd_dat
  ldr r0, =0x00
  bl lcd_dat
  ldr r0, =0x00
  bl lcd_dat
  ldr r0, =0xef
  bl lcd_dat
  ldr r0, =0x00
  bl lcd_cmd
  ldr r0, =0x29
  bl lcd_cmd
  ldr r0, =0x2c
  bl lcd_cmd
  ldr r0, =0x2c
  bl lcd_cmd

  ldr r4, =240*180
  ldr r5, =0xffff
0:
  lsr r0, r5, #8
  bl lcd_dat
  mov r0, r5
  bl lcd_dat
  subs r4, #1
  bne 0b

loop:
  b loop

delay:
  push {lr}
0:
  subs r0, #1
  bne 0b
  pop {pc}
 
lcd_rst:
  push {r4, r5, lr}
  ldr r4, =PIO_BASE + PD
  ldr r5, =0xffffffff
 
  bic r5, #LCD_RST
  str r5, [r4, #PIO_DATA]
  ldr r0, =10000
  bl delay
 
  orr r5, #LCD_RST
  str r5, [r4, #PIO_DATA]
  ldr r0, =10000
  bl delay
  pop {r4, r5, pc}
 
lcd_wr:
  push {r4, r5, lr}
  ldr r4, =PIO_BASE + PD

  and r0, #0xff
  lsl r0, #1
  mov r5, r0
  orr r5, r1
  orr r5, #LCD_RST
  orr r5, #LCD_RD
  str r5, [r4, #PIO_DATA]
 
  orr r5, #LCD_WR
  str r5, [r4, #PIO_DATA]
  pop {r4, r5, pc}
 
lcd_dat:
  push {lr}
  mov r1, #LCD_RS
  bl lcd_wr
  pop {pc}
 
lcd_cmd:
  push {lr}
  mov r1, #0
  bl lcd_wr
  pop {pc}
  .end

終於顯示白屏了～但是，怎麼沒有全屏？司徒往回找了一下，發現這個屏的初始化命令(解析度)竟然是使用240x240...

司徒開始探測問題，發現屏的上方有一塊區域被隱蔽(前30行)

下方也有一塊區域被隱蔽(後15行)

經過一番測試後，結論是：屏的原生解析度是240x240，不過，可視區域只有240x195，最後，屏終於可以正常控制了～

main.s

  .global _start
   
  .equiv PIO_BASE,  0x01c20800 
  .equiv PA,        (0x24 * 0)
  .equiv PB,        (0x24 * 1)
  .equiv PC,        (0x24 * 2)
  .equiv PD,        (0x24 * 3)
  .equiv PE,        (0x24 * 4)
  .equiv PIO_CFG0,  0x00
  .equiv PIO_CFG1,  0x04
  .equiv PIO_CFG2,  0x08
  .equiv PIO_DATA,  0x10
 
  .equiv LCD_CS,    (1 << 21)
  .equiv LCD_RD,    (1 << 20)
  .equiv LCD_RS,    (1 << 19)
  .equiv LCD_WR,    (1 << 18)
  .equiv LCD_RST,   (1 << 0)
 
  .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 r4, =PIO_BASE + PD
  ldr r1, =0x11111111
  str r1, [r4, #PIO_CFG0]
  str r1, [r4, #PIO_CFG1]
  str r1, [r4, #PIO_CFG2]
  
  ldr r4, =PIO_BASE + PE
  ldr r1, =0x11111111
  str r1, [r4, #PIO_CFG0]
  str r1, [r4, #PIO_CFG1]
  str r1, [r4, #PIO_CFG2]
 
  ldr r4, =PIO_BASE + PD
  ldr r1, =0xffffffff
  str r1, [r4, #PIO_DATA]
 
  ldr r4, =PIO_BASE + PE
  ldr r1, =0xffffffff
  str r1, [r4, #PIO_DATA]
 
  bl lcd_rst

  ldr r0, =0x11
  bl lcd_cmd
  ldr r0, =0x36
  bl lcd_cmd
  ldr r0, =0x0a
  bl lcd_dat
  ldr r0, =0x3a
  bl lcd_cmd
  ldr r0, =0x05
  bl lcd_dat
  ldr r0, =0x34
  bl lcd_cmd
  ldr r0, =0x35
  bl lcd_cmd
  ldr r0, =0x00
  bl lcd_dat
  ldr r0, =0xb2
  bl lcd_cmd
  ldr r0, =0x0c
  bl lcd_dat
  ldr r0, =0x0c
  bl lcd_dat
  ldr r0, =0x00
  bl lcd_dat
  ldr r0, =0x33
  bl lcd_dat
  ldr r0, =0x33
  bl lcd_dat
  ldr r0, =0xb7
  bl lcd_cmd
  ldr r0, =0x02
  bl lcd_dat
  ldr r0, =0xbb
  bl lcd_cmd
  ldr r0, =0x30
  bl lcd_dat
  ldr r0, =0xc0
  bl lcd_cmd
  ldr r0, =0x2c
  bl lcd_dat
  ldr r0, =0xc2
  bl lcd_cmd
  ldr r0, =0x01
  bl lcd_dat
  ldr r0, =0xc3
  bl lcd_cmd
  ldr r0, =0x17
  bl lcd_dat
  ldr r0, =0xc4
  bl lcd_cmd
  ldr r0, =0x20
  bl lcd_dat
  ldr r0, =0xc6
  bl lcd_cmd
  ldr r0, =0x0f
  bl lcd_dat
  ldr r0, =0xd0
  bl lcd_cmd
  ldr r0, =0xa4
  bl lcd_dat
  ldr r0, =0xa1
  bl lcd_dat
  ldr r0, =0xd6
  bl lcd_cmd
  ldr r0, =0xa1
  bl lcd_dat
  ldr r0, =0xe0
  bl lcd_cmd
  ldr r0, =0xd0
  bl lcd_dat
  ldr r0, =0x04
  bl lcd_dat
  ldr r0, =0x0c
  bl lcd_dat
  ldr r0, =0x11
  bl lcd_dat
  ldr r0, =0x13
  bl lcd_dat
  ldr r0, =0x2c
  bl lcd_dat
  ldr r0, =0x3b
  bl lcd_dat
  ldr r0, =0x55
  bl lcd_dat
  ldr r0, =0x44
  bl lcd_dat
  ldr r0, =0x16
  bl lcd_dat
  ldr r0, =0x0d
  bl lcd_dat
  ldr r0, =0x0b
  bl lcd_dat
  ldr r0, =0x1f
  bl lcd_dat
  ldr r0, =0x23
  bl lcd_dat
  ldr r0, =0xe1
  bl lcd_cmd
  ldr r0, =0xd0
  bl lcd_dat
  ldr r0, =0x04
  bl lcd_dat
  ldr r0, =0x0b
  bl lcd_dat
  ldr r0, =0x10
  bl lcd_dat
  ldr r0, =0x13
  bl lcd_dat
  ldr r0, =0x2c
  bl lcd_dat
  ldr r0, =0x3a
  bl lcd_dat
  ldr r0, =0x44
  bl lcd_dat
  ldr r0, =0x51
  bl lcd_dat
  ldr r0, =0x26
  bl lcd_dat
  ldr r0, =0x1f
  bl lcd_dat
  ldr r0, =0x1f
  bl lcd_dat
  ldr r0, =0x20
  bl lcd_dat
  ldr r0, =0x23
  bl lcd_dat
  ldr r0, =0x21
  bl lcd_cmd
  ldr r0, =0x2a
  bl lcd_cmd
  ldr r0, =0x00
  bl lcd_dat
  ldr r0, =0x00
  bl lcd_dat
  ldr r0, =0x00
  bl lcd_dat
  ldr r0, =0xef
  bl lcd_dat
  ldr r0, =0x2b
  bl lcd_cmd
  ldr r0, =0x00
  bl lcd_dat
  ldr r0, =0x00
  bl lcd_dat
  ldr r0, =0x00
  bl lcd_dat
  ldr r0, =0xef
  bl lcd_dat
  ldr r0, =0x00
  bl lcd_cmd
  ldr r0, =0x29
  bl lcd_cmd
  ldr r0, =0x2c
  bl lcd_cmd
  ldr r0, =0x2c
  bl lcd_cmd

  ldr r4, =240*30
  ldr r5, =0xffff
0:
  lsr r0, r5, #8
  bl lcd_dat
  mov r0, r5
  bl lcd_dat
  subs r4, #1
  bne 0b

  ldr r4, =240*65
  ldr r5, =0xf800
0:
  lsr r0, r5, #8
  bl lcd_dat
  mov r0, r5
  bl lcd_dat
  subs r4, #1
  bne 0b

  ldr r4, =240*65
  ldr r5, =0x7e0
0:
  lsr r0, r5, #8
  bl lcd_dat
  mov r0, r5
  bl lcd_dat
  subs r4, #1
  bne 0b

  ldr r4, =240*65
  ldr r5, =0x1f
0:
  lsr r0, r5, #8
  bl lcd_dat
  mov r0, r5
  bl lcd_dat
  subs r4, #1
  bne 0b

loop:
  b loop

delay:
  push {lr}
0:
  subs r0, #1
  bne 0b
  pop {pc}
 
lcd_rst:
  push {r4, r5, lr}
  ldr r4, =PIO_BASE + PD
  ldr r5, =0xffffffff
 
  bic r5, #LCD_RST
  str r5, [r4, #PIO_DATA]
  ldr r0, =10000
  bl delay
 
  orr r5, #LCD_RST
  str r5, [r4, #PIO_DATA]
  ldr r0, =10000
  bl delay
  pop {r4, r5, pc}
 
lcd_wr:
  push {r4, r5, lr}
  ldr r4, =PIO_BASE + PD

  and r0, #0xff
  lsl r0, #1
  mov r5, r0
  orr r5, r1
  orr r5, #LCD_RST
  orr r5, #LCD_RD
  str r5, [r4, #PIO_DATA]
 
  orr r5, #LCD_WR
  str r5, [r4, #PIO_DATA]
  pop {r4, r5, pc}
 
lcd_dat:
  push {lr}
  mov r1, #LCD_RS
  bl lcd_wr
  pop {pc}
 
lcd_cmd:
  push {lr}
  mov r1, #0
  bl lcd_wr
  pop {pc}
  .end

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