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--- en:c2_cvbs [2016/10/13 14:40]
joy.cho created
+++ 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 =======
+===== Hardware Example =====
+The below picture is a sample guide.
+You can find **cvbs** test point by header J7 near HDMI connector.
+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>