NEC RPI3CM-2 Raspberry Pi Compute Module Setup Guide

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• EXPAND - Use EXPAND if the Compute Module is configured to output “limited” video in the

range 16-235. The display will expand the video from the range 16-235 to 0-255 internally.

The video range used by the Compute Module depends on the Operating System. By default and

depending on the OS, many distributions will automatically output a video signal to the display that uses

video levels 16 to 235. A configuration file or menu setting is used to configure the video level. See “Table

5-1: Operating System Distro” for details about each OS.

For Raspbian and many other OS distros, the current video settings can be confirmed by typing the

following into a terminal window:

tvservice –s

The output should show something similar to the following:

“HDMI CEA (16) RGB lim 16:9, 1920x1080 @ 60.00 Hz, progressive”

If “lim” is shown, it means that limited 16 – 235 video is being output to the display.

To change this setting, a configuration file must be edited. If changing the setting from the Compute

Module itself, use the built in text editor “Nano” to edit the config.txt file:

sudo nano /boot/config.txt

Scroll to the end of the file and enter the following line:

hdmi_pixel_encoding=2

Save the file by pressing CONTROL + o then ENTER

Exit Nano by pressing CONTROL + x

Restart the Compute Module by typing:

sudo reboot

When rebooted, confirm the video levels are correct by using the following command again:

tvservice –s

The output should now show “full”

“HDMI CEA (16) RGB full 16:9, 1920x1080 @ 60.00 Hz, progressive”

8.2 To disable overscan (if black bars are visible on the sides of the

screen)

Either

• Run the Raspberry Pi Config utility

sudo raspi-config

Select: 9 Advanced Options

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NEC RPI3CM-2 Edition Raspberry Pi Compute Module