rk3288 lvds TF卡修改屏参

之前学习到《安卓主板屏幕参数配置》

这一次就深入了解一下屏参是什么

以宽视屏M215HGE-L21_-奇美21.5液晶显示屏  为例说明修改屏参为题!!

1、屏参文件dis.cfg， 如下：

[display_param]
screen-type = 3;   //=2;为单8  =3；为双8  for  LVDS
lvds-format = 0;   //0=LVDS_VESA   1=LVDS_JEIDA  2=LVDS_XXX   3=LVDS_XX
out-face    = 0;
color-mode = 0;
clock-frequency = 148000000;
hactive = 1920;   //=x
vactive = 1080;    //=y
hback-porch = 180;
hfront-porch = 97;
vback-porch = 30;
vfront-porch = 12;
hsync-len = 3;
vsync-len = 3;
hsync-active = 0;
vsync-active = 0;
de-active = 0;
pixelclk-active = 0;
swap-rb = 0;
swap-rg = 0;
swap-gb = 0;
end
 
//hback-porch + hfront-porch  =THB
//vback-porch + vfront-porch = TVB
 
一下说明如何配置参数的！！！！！依据液晶屏规格书
 
 
首先TF 建议使用4GB 以下的容量！！！！需要格式为FAT32
确保M320_PCB供电正常！，多拔插几次确保TF读取正常!
 
 
只有在开机过程才能读取屏参!!!!!!
 
 
修改dis.cfg 文件，，修改后放到TF卡里面上电开机就可以更改并保存屏参，，例如：/dou/dis.cfg
 
在TF卡根目录下建文件夹“dou”在">dou文件夹里面放"dis.cfg"文件
hback-porch + hfront-porch  =THB
vback-porch + vfront-porch = TVB
fps必须=60hz，或者=50HZ
fps=(clock)/((hactive +THB)*(vactive + TVB))=60
fps =50HZ <= (clock-frequency)/{(hactive + hback-porch + hfront-porch + 3)*(vactive + vback-porch + vfront-porch + 3)} <= 60
/*              lvds connect config       
 *                                        
 *      lvds-format = 0    lvds-format = 1     lvds-format = 2     lvds-format = 3
----------------------------------------------------------------------
        TX0     R0              R2              R2              R0
        TX1     R1              R3              R3              R1
        TX2     R2              R4              R4              R2
Y       TX3     R3              R5              R5              R3
0       TX4     R4              R6              R6              R4
        TX6     R5              R7              R7              R5      
        TX7     G0              G2              G2              G0
----------------------------------------------------------------------
        TX8     G1              G3              G3              G1
        TX9     G2              G4              G4              G2
Y       TX12    G3              G5              G5              G3
1       TX13    G4              G6              G6              G4
        TX14    G5              G7              G7              G5
        TX15    B0              B2              B2              B0
        TX18    B1              B3              B3              B1
----------------------------------------------------------------------
        TX19    B2              B4              B4              B2
        TX20    B3              B5              B5              B3
        TX21    B4              B6              B6              B4
Y       TX22    B5              B7              B7              B5
2       TX24    HSYNC           HSYNC           HSYNC           HSYNC
        TX25    VSYNC           VSYNC           VSYNC           VSYNC
        TX26    ENABLE          ENABLE          ENABLE          ENABLE
----------------------------------------------------------------------
        TX27    R6              R0              GND             GND
        TX5     R7              R1              GND             GND
        TX10    G6              G0              GND             GND
Y       TX11    G7              G1              GND             GND
3       TX16    B6              B0              GND             GND
        TX17    B7              B1              GND             GND
        TX23    RSVD            RSVD            RSVD            RSVD
----------------------------------------------------------------------
*/

后面的理解有点难，留作收藏学习了

2、参考规格书修改屏参说明

3、注意屏电压问题!!!

4、屏参问题

hback-porch + hfront-porch  =THB  ==140X2 = 280

vback-porch + vfront-porch = TVB         == 45

fps必须=60hz，或者=50HZ

fps=(clock)/((hactive +THB)*(vactive + TVB))=60

fps =50HZ <= (clock-frequency)/{(hactive + hback-porch + hfront-porch + 3)*(vactive + vback-porch + vfront-porch + 3)} <= 60

5、 屏模式问题

如果出现水彩！！！

lvds-format = 0;    或者lvds-format = 1;

5、奇葩奇美42,10BIT_LVDS

屏参如下：

[display_param]

screen-type = 3;

lvds-format = 0;

out-face    = 0;

color-mode = 0;

clock-frequency = 148600000;

hactive = 1920;

vactive = 1080;

hback-porch = 210;

hfront-porch = 16;

vback-porch = 34;

vfront-porch = 16;

hsync-len = 22;

vsync-len = 4;

hsync-active = 1;

vsync-active = 1;

de-active = 0;

pixelclk-active = 0;

swap-rb = 0;

swap-rg = 0;

swap-gb = 0;

end

6、常规1920_1080——LVDS屏参

[display_param]

screen-type = 3;

lvds-format = 0;

out-face    = 0;

color-mode = 0;

clock-frequency = 148000000;

hactive = 1920;

vactive = 1080;

hback-porch = 180;

hfront-porch = 97;

vback-porch = 30;

vfront-porch = 12;

hsync-len = 3;

vsync-len = 3;

hsync-active = 0;

vsync-active = 0;

de-active = 0;

pixelclk-active = 0;

swap-rb = 0;

swap-rg = 0;

swap-gb = 0;

end

7、 15寸夏普和三菱LVDS--1024_768   DE模式

[display_param]

screen-type = 2;

lvds-format = 2;

out-face    = 0;

color-mode = 0;

clock-frequency = 58000000;

hactive = 1024;

vactive = 768;

hback-porch = 120;        //320 /2  =160 OK

hfront-porch = 40;

vback-porch = 20;

vfront-porch = 9;

hsync-len = 3;

vsync-len = 3;

hsync-active = 0;

vsync-active = 0;

de-active = 0;

pixelclk-active = 0;

swap-rb = 0;

swap-rg = 0;

swap-gb = 0;

end