司徒的教學網站

掌機 - Game Gear Micro - 找出LCD初始化代碼

參考資料：
https://github.com/ethanpierce/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
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0.464346640,1,1,1,0,0,0,0,0,0,0,0,1
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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
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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

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

Steward

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掌機 - Game Gear Micro - 找出LCD初始化代碼