CVBS

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1 Enable CVBS Output in H3 Linux-3.4 BSP

FriendlyElec's image for H3 Linux-3.4 works with the NanoPi M1 Plus / NanoPi M1 / NanoPi Duo2 and it supports CVBS output. This image supports either HDMI or CVBS output. For the NanoPi M1 Plus/M1 by default HDMI is enabled and CVBS is disabled. For the NanoPi Duo2 by default CVBS is enabled and HDMI is disabled.

Refer to the following steps to manually enable CVBS for The NanoPi M1 Plus / M1.

1.1 参考文档

$ git clone https://github.com/friendlyarm/h3_lichee.git lichee --depth 1
$ ls lichee/doc/H3 sys_config.fex使用配置说明V1.1.pdf。

1.2 修改sys_config

以NanoPi M1 Plus 为例，NanoPi M1 的修改操作也是类似的。
M1 Plus的sys_config文件路径如下:

$ ls lichee/tools/pack/chips/sun8iw7p1/configs/nanopi-h3/board/sys_config_nanopi-m1-plus.fex

禁止HDMI 并且使能CVBS:

[disp_init]
disp_init_enable = 1
disp_mode = 1
screen0_output_type = 3
screen0_output_mode = 5
screen1_output_type = 2
screen1_output_mode = 14
fb0_format = 0
fb0_width = 0
fb0_height = 0
fb1_format = 0
fb1_width = 0
fb1_height = 0
 
[hdmi_para]
hdmi_used = 0
hdmi_power = "vcc-hdmi-18"
 
[tv_para]
tv_used = 1
tv_dac_used = 1
tv_dac_src0 = 0

1.3 编译更新

编译lichee:

$ cd lichee/fa_tools
$ ./build.sh -b nanopi-m1-plus -p linux -t all

更新SD卡:

$ cd lichee/fa_tools
$ ./fuse.sh -d /dev/sdX -p linux -t u-boot

/dev/sdX 请替换为实际的TF卡设备文件名。