NEC MPI4E Raspberry Pi Compute Module Setup Guide

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3.4 Software control via IR Remote

An IR Remote can be used to control software running on the Compute Module, such as a media player.

IR Remote signals are received via the display’s built-in remote control sensor or via an optional external

KT-RC3 sensor.

Note: The display’s built-in sensor will automatically be disabled when the external KT-RC3 sensor is

connected.

This feature can be used in two ways:

• As a CEC (Consumer Electronics Control) device

Specific buttons on the NEC IR Remote will perform actions, such as Stop, Play, Next, Previous,

etc., on CEC enabled software on the Compute Module. The display is responsible for receiving

and decoding the IR Remote signals, and then forwarding them on to the Compute Module as

standard CEC commands.

Only the NEC IR Remote can be used, and CEC support must be enabled on the display and in

the Operating System on the Compute Module. See Figure 5.15.1-3: Supported CEC buttons on

the NEC IR Remote in CEC MODE 1 on page Error! Bookmark not defined. and Figure 5.15.1-4:

Supported CEC buttons on the NEC IR Remote in CEC MODE 2 on page Error! Bookmark not

defined..

The buttons used for CEC commands are dual-function on the NEC IR Remote. When the

display’s OSD is active (being displayed) the buttons will perform display related functions.

When the OSD is not active the buttons will perform CEC functions. Press the EXIT button on the

IR Remote to exit and deactivate the OSD.

See section 6.16 on page 50 and section 6.17 on page 51 for more information.

• As a generic IR receiver

Demodulated raw IR signals received by the remote control sensor are passed to the Raspberry

Pi Compute Module via GPIO 18. Packages such as lirc can be used to decode the raw IR signals.

IR Remotes other than the NEC IR Remote, such as a standard MCE/RC6 type, can be used if

they use a 40 KHz carrier. See section 5.6 on page 36, section 5.7 on page 37, and section 6.5 on

page 45 for more information.

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NEC MPI4E RaspberryPi 4 System on a Chip Solution