NEC MPI4E Raspberry Pi Compute Module Setup Guide

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Note: The Volume Up, Down and Mute buttons will control audio on the display rather than on any

media player software running on the Compute Module. These buttons will only operate in CEC mode

if a CEC compatible audio amp/receiver is used.

3.5 GPIO

The following GPIO are used for signaling between the display and Compute Module:

• GPIO 14 & 15 (UART0 TX & RX) – internal serial connection to the display for control. This can be

enabled and disabled via the OSD setting (see 6.11 Slot  Compute Module  Advanced

Setting  Monitor Control on page 48.)

• GPIO 18 – (input to Compute Module) demodulated IR receiver from the display. This can be

enabled and disabled via the OSD setting (see 6.10 Slot  Compute Module  Advanced

Setting  IR Signal on page 48.)

• GPIO 23 – (input to Compute Module) shutdown signal (goes low to signal the display is about to

shut down power to the Compute Module). This can be enabled and disabled via the OSD

setting (see 6.9 Slot  Compute Module  Advanced Setting  Shutdown Signal on page 47.)

• GPIO 24 – (output from the Compute Module) cooling fan control (set high to force the display’s

cooling fans on).

Figure 3.5-1: GPIO

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NEC MPI4E RaspberryPi 4 System on a Chip Solution