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en:c2_cvbs [2016/10/13 14:42]
joy.cho
en:c2_cvbs [2016/11/07 18:09] (current)
joy.cho [Software Guide (2) - Android]
Line 1: Line 1:
 ========= CVBS Video Output ======= ========= CVBS Video Output =======
  
-( Under construction )+===== Hardware Example =====
  
-===== Connection =====+The below picture is a sample guide.
  
 +You can find **cvbs** test point by header J7 near HDMI connector.
  
-==== boot.ini ====+We recommend to use board backside point as the following picture. **Pin 1 of header J7** can be used as Ground point.
  
 +{{:​en:​c2_cvbs1.png?​700|}} {{:​en:​c2_cvbs2.png?​700|}}
  
 +
 +==== Software Guide (1) - Ubuntu ====
 +
 +<WRAP center round important>​
 +  * Ubuntu : Available with 3.14.79-89 (Oct 13, 2016) or higher version
 +</​WRAP>​
 +
 +There are two modes of CVBS, **480cvbs** and **576cvbs** on C2.
 +
 +You need to modify boot.ini to set CVBS output.
 +<​code>​
 +setenv m "​480cvbs"​
 +setenv cvbsmode "​480cvbs"​
 +
 +setenv bootargs ${bootargs} cvbsmode=${cvbsmode}
 +</​code>​
 +
 +And make sure the **vout** mode is set as **hdmi** mode.
 +<​code>​
 +setenv vout "​hdmi"​
 +</​code>​
 +== Overscan ==
 +Please refer to the following article.
 +
 +http://​magazine.odroid.com/​wp-content/​uploads/​ODROID-Magazine-201602.pdf#​page=9
 +
 +As we tested cvbs mode with our monitors, overscan setting is needed.
 +
 +For example, in case of 480cvbs mode, the following values can be used.
 +<​code>​
 +# echo 20 20 695 478 > /​sys/​class/​graphics/​fb0/​window_axis ​                                                                                            
 +# echo 0x10001 > /​sys/​class/​graphics/​fb0/​free_scale
 +</​code>​
 +
 +==== Software Guide (2) - Android ====
 +
 +<WRAP center round important>​
 +  * We're planning to release CVBS functionality soon. The version will be specified here after new release.
 +</​WRAP>​
 +
 +Please refer to the following example.
 +<​code>​
 +setenv hdmimode "​480cvbs"​
 +showlogo "​hdmimode"​
 +</​code>​
 +And make sure the **vout** mode is set as **hdmi** mode.
 +<​code>​
 +setenv vout "​hdmi"​
 +</​code>​
 +
 +== Overscan ==
 +As we tested cvbs mode with our monitors, overscan setting is needed.
 +For example, the following values can be used.
 +<​code>​
 +### 480cvbs
 +$ wm overscan 30,25,30,10
 +
 +### 576cvbs
 +$ wm overscan 40,​10,​50,​110
 +</​code>​
en/c2_cvbs.1476339175.txt.gz ยท Last modified: 2016/10/13 14:42 by joy.cho
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