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blackoil
初级用户
积分 58
发帖 18
注册 2005-11-26
来自 广州
状态 离线
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『楼 主』:
设置120赫兹屏幕刷新率代码
SetVESA_Mode: mov ax,0x4F02
mov bx,[VideoMode]
push ds
pop es
mov di,CRTC
int 0x10
int 0x20
VideoMode dw VESA_Mode_640x480x16M | VESA_Bit_LFB | VESA_Bit_CRTC
CRTC dw 848
dw 680
dw 744
dw 518
dw 483
dw 487
db 0
dd 52500000 ;pixel clock
dw 12000 ;120hz refresh rate
times 40 db 0
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 2006-11-5 11:24 |
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zyl910
中级用户
积分 282
发帖 126
注册 2006-5-17
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『第
2 楼』:
CRTCInfoBlock struc
HorizontalTotal dw ? ; Horizontal total in pixels
HorizontalSyncStart dw ? ; Horizontal sync start in pixels
HorizontalSyncEnd dw ? ; Horizontal sync end in pixels
VerticalTotal dw ? ; Vertical total in lines
VerticalSyncStart dw ? ; Vertical sync start in lines
VerticalSyncEnd dw ? ; Vertical sync end in lines
Flags db ? ; Flags (Interlaced, Double Scan etc)
PixelClock dd ? ; Pixel clock in units of Hz
RefreshRate dw ? ; Refresh rate in units of 0.01 Hz
Reserved db 40 dup (?) ; remainder of ModeInfoBlock
CRTCInfoBlock ends
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人类存在的目的就是试图理解人类为何存在 |
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2006-11-5 13:01 |
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zyl910
中级用户
积分 282
发帖 126
注册 2006-5-17
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『第
3 楼』:
我一直不清楚 水平/垂直总量、回扫时间、消隐时间 这些参数是怎么推算出来的
望大虾指点
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人类存在的目的就是试图理解人类为何存在 |
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2006-11-5 13:04 |
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blackoil
初级用户
积分 58
发帖 18
注册 2005-11-26
来自 广州
状态 离线
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2006-11-5 22:45 |
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zyl910
中级用户
积分 282
发帖 126
注册 2006-5-17
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『第
5 楼』:
Thanks!
研究中
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人类存在的目的就是试图理解人类为何存在 |
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2006-11-6 05:58 |
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x2wei
初级用户
积分 44
发帖 17
注册 2006-4-24
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『第
6 楼』:
楼上的兄弟搞清了写个小程序出来,给大家试试呀：）共同学
楼主写的asm有点不明白:(
VideoMode dw VESA_Mode_640x480x16M | VESA_Bit_LFB | VESA_Bit_CRTC ?
times 40 db 0 ?
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2006-11-8 21:06 |
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zyl910
中级用户
积分 282
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注册 2006-5-17
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『第
7 楼』:
对于：
CRTC dw 848
dw 680
dw 744
dw 518
dw 483
dw 487
db 0
dd 52500000 ;pixel clock
dw 12000 ;120hz refresh rate
times 40 db 0
这个是CRTCInfoBlock结构：
CRTCInfoBlock struc
HorizontalTotal dw ? ; Horizontal total in pixels
HorizontalSyncStart dw ? ; Horizontal sync start in pixels
HorizontalSyncEnd dw ? ; Horizontal sync end in pixels
VerticalTotal dw ? ; Vertical total in lines
VerticalSyncStart dw ? ; Vertical sync start in lines
VerticalSyncEnd dw ? ; Vertical sync end in lines
Flags db ? ; Flags (Interlaced, Double Scan etc)
PixelClock dd ? ; Pixel clock in units of Hz
RefreshRate dw ? ; Refresh rate in units of 0.01 Hz
Reserved db 40 dup (?) ; remainder of ModeInfoBlock
CRTCInfoBlock ends
至于
VideoMode dw VESA_Mode_640x480x16M | VESA_Bit_LFB | VESA_Bit_CRTC
这是VBE显示模式，估计这些常数是：
VESA_Mode_640x480x16M = 112h
VESA_Bit_LFB = 4000h
VESA_Bit_CRTC = 0800h
这个程序利用了VBE 3.0的一些特性：
| Quote: | Function 02h - Set VBE Mode
Input: AX = 4F02h Set VBE Mode
BX = Desired Mode to set
D0-D8 = Mode number
D9-D10 = Reserved (must be 0)
D11 = 0 Use current default refresh rate
= 1 Use user specified CRTC values for refresh rate
D12-13 Reserved for VBE/AF (must be 0)
D14 = 0 Use windowed frame buffer model
= 1 Use linear/flat frame buffer model
D15 = 0 Clear display memory
= 1 Don't clear display memory
ES:DI= Pointer to CRTCInfoBlock structure
Output: AX = VBE Return Status
Note: All other registers are preserved.
The CRTC information block has the following structure:
CRTCInfoBlock struc
HorizontalTotal dw ? ; Horizontal total in pixels
HorizontalSyncStart dw ? ; Horizontal sync start in pixels
HorizontalSyncEnd dw ? ; Horizontal sync end in pixels
VerticalTotal dw ? ; Vertical total in lines
VerticalSyncStart dw ? ; Vertical sync start in lines
VerticalSyncEnd dw ? ; Vertical sync end in lines
Flags db ? ; Flags (Interlaced, Double Scan etc)
PixelClock dd ? ; Pixel clock in units of Hz
RefreshRate dw ? ; Refresh rate in units of 0.01 Hz
Reserved db 40 dup (?) ; remainder of ModeInfoBlock
CRTCInfoBlock ends
The Flags field defines the following flags that modify the operation of the mode as follows:
D0 = Double Scan Mode Enable
0 = Graphics mode is not double scanned
1 = Graphics mode is double scanned
D1 = Interlaced Mode Enable
0 = Graphics mode is non-interlaced
1 = Graphics mode is interlaced
D2 = Horizontal sync polarity
0 = Horizontal sync polarity is positive (+)
1 = Horizontal sync polarity is negative (-)
D3 = Vertical sync polarity
0 = Vertical sync polarity is positive (+)
1 = Vertical sync polarity is negative (-) |
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VBE 3.0:
http://www.vesa.org/public/VBE/vbe3.pdf
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人类存在的目的就是试图理解人类为何存在 |
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2006-11-8 22:07 |
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blackoil
初级用户
积分 58
发帖 18
注册 2005-11-26
来自 广州
状态 离线
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『第
8 楼』:
我用了自己的编译器的语法
times 40 db 0 就是 40 个字节的0
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2006-11-12 05:53 |
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