====== VIM4 HDMI Input for 5.4 Kernel ======

===== Introduction =====

This documentation will introduce the usage of HDMI Input.

<WRAP important >
This documentation is only for Linux system.
</WRAP>

===== Preparation =====

<WRAP important >
HDMI input preview can only work under framebuffer console, so you need to use the server image, you can install via OOWOW.
</WRAP>

<WRAP important >
You must connect your VIM4 to a workablbe HDMI screen or the HDMI IN will not working.
</WRAP>

<WRAP tip >
If you use the desktop image, you need to switch to the framebuffer console.
</WRAP>

```shell
sudo chvt 3
echo 1 | sudo tee /sys/class/graphics/fb0/blank
echo 0 | sudo tee /sys/class/graphics/fb0/blank
```

<WRAP tip >
If you want to go back to the desktop ''sudo chvt 2''
</WRAP>


===== Install HDMI Input Demo =====

```shell
sudo apt update
sudo apt install libgrpc++1 libboost-system1.74.0
wget https://github.com/numbqq/hdmiin-demo-debs-aml/raw/5.4/jammy/arm64/hdmiin-demo_0.5-202211_arm64.deb
sudo dpkg -i hdmiin-demo_0.5-202211_arm64.deb
```

===== Test =====

  * Connect your VIM4 HDMI Out to an HDMI Display
  * Connect your HDMI OUT cable to VIM4 HDMI IN port
  * Execute the HDMI Input demo command ''sudo hdmiin-demo''

If everything is OK you will see the HDMI Input source on your display.

===== Known Issues =====