NEC MPI4E Raspberry Pi Compute Module Setup Guide

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5. Edit the cmdline.txt file to allow app access to the serial port and prevent bootup information

being sent to the display by removing any section with:

console=serial0,115200

Important: When the Raspberry Pi boots up, all the bootup information can be sent to the serial port

for debugging purposes. Since this serial port is connected internally to the display, this may

overwhelm the display and cause erratic behavior (such as the OSD flashing, random operations

being performed, slow bootup of the Compute Module, etc.). If the internal connection is enabled (the

MONITOR CONTROL setting on the COMPUTE MODULE  ADVANCED SETTINGS menu of the

OSD is set to ENABLE) then the bootup information must be disabled.

5.9 Testing internal serial communications to the display using the

Python based NEC PD SDK

1. Install the Python based NEC PD SDK files, and download the examples. See Python Based NEC

PD SDK on page 65.

2. If necessary, install the Python serial module. This should normally be automatically installed.

sudo apt install python-serial

3. Run the test file in the SDK.

python test_routines_example.py

4. The application should output information about the display, such as model name and serial

number.

Note: Confirm the MONITOR CONTROL is set to ENABLE on the OSD.

5.10 Configuring the Compute Module to shutdown using shutdown

signal from the display

To enable the Shutdown Signal from the display:

1. On the NEC display navigate to the SLOT menu on the OSD.

2. Select the ADVANCED SETTINGS options after COMPUTE MODULE.

3. Confirm that the SHUTDOWN SIGNAL is set to ENABLE.

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NEC MPI4E RaspberryPi 4 System on a Chip Solution