03-Functional_Testing

LED

The development board is equipped with two LEDs:

• Green LED: Power indicator (stays on when powered).

• Blue LED: Heartbeat indicator (blinks continuously after the kernel boots).

User-Level LED Control

By default, the LED trigger mode is set to heartbeat, which prevents manual control. To enable command-based control, use the following commands:

$ echo none > /sys/class/leds/sysled/trigger
$ echo 1 > /sys/class/leds/sysled/brightness  # Turn on
$ echo 0 > /sys/class/leds/sysled/brightness  # Turn off

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WiFi / Bluetooth

The K5C board integrates the AW859A high-performance WiFi module.

WiFi Operations

# List network devices
sudo nmcli dev

# Enable WiFi
sudo nmcli r wifi on

# Disable WiFi
sudo nmcli r wifi off

# Scan for nearby hotspots
sudo nmcli dev wifi

# Connect to a hotspot (replace SSID and PASSWORD)
sudo nmcli dev wifi connect "SSID" password "PASSWORD" ifname wlan0

Bluetooth Operations Install dependencies:

apt-get install pulseaudio-module-bluetooth
reboot

Control commands:

bluetoothctl           # Enter Bluetooth console
scan on                # Start scanning
pair 28:52:E0:19:17:69 # Pair with a device
connect 28:52:E0:19:17:69 # Connect to a device

Bluetooth Audio Playback Note: Only works on desktop terminals, not serial terminals.

# Set default audio sink
pacmd set-default-sink bluez_sink.28_52_E0_19_17_69
# Play audio
aplay sample-15s.wav

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Key Functions

The K5C board has three buttons:

• POWER: Controls screen on/off (Android) or opens logout screen (Ubuntu).

• RESET: System reset button.

• RECOVERY: Enters firmware flashing mode.

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RTC Testing

Power-Off Time Retention Test Steps:

1. Connect the board to the network for automatic time synchronization.

2. Disconnect network and power.

3. Wait for a period, then reconnect power.

4. If the system time matches the current time, RTC functions properly.

Note: Ensure a CR2032 battery is installed and charged.

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IR (Infrared) Testing

Check input devices:

cat /proc/bus/input/devices

image-20250517110612748

Test IR receiver:

hexdump /dev/input/event2  # Press remote buttons to see data output

image-20250517110644728

LCD Testing

Supports Single LVDS, Dual LVDS, and MIPI displays. For details, see LCD.

Backlight Control

echo lcd0 > /sys/kernel/debug/dispdbg/name
echo setbl > /sys/kernel/debug/dispdbg/command
echo 128 > /sys/kernel/debug/dispdbg/param  # Set brightness (0-255)
echo 1 > /sys/kernel/debug/dispdbg/start

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Fan Control

The board includes a GPIO-controlled fan (enabled by default).

# Check fan status
cat /sys/class/leds/fan_en/brightness

# Turn on
echo 255 > /sys/class/leds/fan_en/brightness

# Turn off
echo 0 > /sys/class/leds/fan_en/brightness

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Speaker/Headphone Testing

Speaker Control

# Enable speaker
echo 255 > /sys/class/leds/spk_en/brightness

# Disable speaker
echo 0 > /sys/class/leds/spk_en/brightness

Audio Playback Ubuntu:

aplay sample-15s.wav

Android:

tinyplay sample-15s.wav

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MIC Testing

Ubuntu

# Record audio
arecord -Dhw:sun50iw10codec -f S24_LE -r 16000 -vvv test.wav
# Playback
aplay test.wav

Android

tinymix "ADCL Input MIC1 Boost Switch" 1
tinycap file.wav -D 0 -d 0 -c 2 -r 16000 -b 16 -T 10
tinyplay file.wav

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Ethernet Testing

Supports Gigabit Ethernet. Speed test results:

• Upload: 783 Mbits/sec

• Download: 898 Mbits/sec

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4G Module Testing

Prerequisites

• Verify USB module detection:

  lsusb
  ls /dev/ttyUSB*

• Insert SIM card and ensure antennas are connected.

Dial-Up Test

pppd call quectel-ppp &  # Start PPP connection
ping www.baidu.com       # Test connectivity

# Debugging commands
jobs       # View background processes
fg %1      # Bring process to foreground
kill -9 $(ps -ef | grep pppd | awk '{print $2}')  # Terminate process

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SD Card Testing

# List partitions
fdisk -l

# Mount SD card
mount /dev/mmcblk1p1 /mnt/

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Touchscreen Testing

# List input devices
cat /proc/bus/input/devices

# Install evtest
apt install evtest
evtest  # Interactive touch test

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USB/SD Card Detection

fdisk -l  # List storage devices