Users Guide

Table Of Contents
Cloud LED On/Off
Cloud LED enables you to visually inspect the operational status of the Edge Gateway by looking at the display light on the left
panel of the Edge Gateway.
1. To export Cloud LED PIN, run the command:
#sudo su
#echo 346 > /sys/class/gpio/export
#echo out > /sys/class/gpio/gpio346/direction
2. To turn on Cloud LED, run the command:
#echo 1 > /sys/class/gpio/gpio346/value
or
To turn off Cloud LED, run the command:
#echo 0 > /sys/class/gpio/gpio346/value
Advanced Linux Sound Architecture (ALSA)
Advanced Linux Sound Architecture (ALSA) is part of the Linux kernel, which provides an Application Programming Interface
(API) for sound card device drivers.
The following table lists ALSA utilities included with the Edge Gateway:
Table 24. ALSA utilities
Utilities Description
alsactl
Advanced controls for ALSA sound drivers
alsaloop
Create loopbacks between PCM capture and playback devices
alsamixer
ALSA Ncurses mixer
alsaucm
ALSA use-case manager
amixer
Command-line mixer
amidi
Read from and write to ALSA raw-MIDI ports
aplay, arecord Command-line playback and recording
aplaymidi, arecordmidi Command-line MIDI playback and recording
aconnect, aseqnet, aseqdump Command-line MIDI sequencer control
iecset
Set or dump IEC958 status bits
speaker-test
Speaker test-tone generator
NOTE: For more information about ALSA on Ubuntu, see packages.ubuntu.com/bionic/alsa-utils.
Playback
The following shows an example of how to playback audio with ALSA.
1. List available devices (default: baytrailcraudio).
# aplay -l
Setting up the operating system
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