NEC MPI4E Raspberry Pi Compute Module Setup Guide

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This feature can be used to automatically reset the Compute Module if the CPU hangs for some reason.

The following two settings control the timeout periods: Start Up Time, Period Time

The Python SDK includes sample functions to send the periodic reset command. However, it is up to the

developer to configure the system to make sure this runs as the Compute Module starts and continues to

periodically send the reset command. See Python Based NEC PD SDK on page 65.

See section 5.12 on page 40 for more details on using this feature.

6.13 Slot  Compute Module  Advanced Setting  WDT  Start Up

Time

For use only when the WDT is set to ENABLE.

This sets the time delay for when the display should start receiving WDT reset commands, via the internal

UART, after power is applied to the Compute Module.

This timer's value should be set high enough to include time for the operating system to fully load, on the

Compute Module, and for the periodic reset commands to begin sending to the display.

6.14 Slot  Compute Module  Advanced Setting  WDT  Period

Time

For use only when the WDT is set to ENABLE.

This sets the maximum amount of time within which the display must receive WDT reset commands from

the Compute Module, via the internal UART. If three consecutive reset commands are missed, the display

will restart the Compute Module.

This timer’s value should be set high enough to ensure that any software running on the Compute Module

will be able to send the periodic reset command to the display, even under heavy load conditions.

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NEC MPI4E RaspberryPi 4 System on a Chip Solution