CL-SOM-iMX8X: Yocto Linux: How-To Guide
Contents
Wireless interfaces
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The operations below requires root access. |
CL-SOM-iMX8X features certified 802.11ac Wi-Fi and Bluetooth 4.2 interfaces (Intel 8265 chipset).
Wi-Fi
Before working with Wi-Fi, please, ensure that Wi-Fi antenna is connected.
For hardware setup and Wi-Fi antenna connection instructions please refer to evaluation kit hardware guide.
To start using Wi-Fi insert your network credentials into the following file:
/etc/wpa_supplicant.conf
Insert the network name into ssid field, password into psk field and key into the key_mgmt field (if your network uses key management).
The file should have the following content:
ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=0
update_config=1
network={
ssid="<the name of your internet acces point>"
key_mgmt=WPA-PSK
psk="<the password of your internet access point>"
}
Execute the following commands to connect to the network.
root@cl-som-imx8x:~# wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant.conf -D nl80211 root@cl-som-imx8x:~# udhcpc -i wlan0
Bluetooth
Before working with Bluetooth, please, ensure that Wi-Fi antenna is connected.
For hardware setup and Bluetooth antenna connection instructions please refer to evaluation kit hardware guide.
To start bluetoothctl use the following command:
bluetoothctl
To start the scan process use the following commands:
[bluetooth]# default-agent [bluetooth]# power on [bluetooth]# scan on
Bluetooth device should be turned on and visible. Its MAC-adress and name should appear in bluetoothctl in following format:
[CHG] Device AA:BB:CC:DD:EE:FF Name: Device_Name
To pair with the Bluetooth device use the following command:
pair AA:BB:CC:DD:EE:FF
Where AA:BB:CC:DD:EE:FF is MAC-adress of the Bluetooth device.
To quit bluetoothctl use the following command:
[Device_Name]# quit
CPU frequency
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The operations below requires root access. |
CPU frequency can be changed in one of the following methods:
Changing the scaling governor
Execute the following command to change scaling governor:
echo performance > /sys/devices/system/cpu/cpufreq/policy0/scaling_governor
Where perfomance is name of the scaling governor.
Execute the following command to see available scaling governors:
cat /sys/devices/system/cpu/cpufreq/policy0/scaling_available_governors
Execute the following command to see current scaling governor:
cat /sys/devices/system/cpu/cpufreq/policy0/scaling_governor
Changing CPU frequency
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CPU frequency can be changed only when userspace scaling governor is enabled. |
Execute the following command to change scaling governor to userspace:
echo userspace > /sys/devices/system/cpu/cpufreq/policy0/scaling_governor
Execute the following command to see available CPU frequencies:
cat /sys/devices/system/cpu/cpufreq/policy0/scaling_available_frequencies
Execute the following command to select the CPU frequency 1.2GHz:
echo 1200000 > /sys/devices/system/cpu/cpufreq/policy0/scaling_setspeed
Execute the following command to see current CPU frequency:
cat /sys/devices/system/cpu/cpufreq/policy0/cpuinfo_cur_freq
CPU temperature
Execute the following command to see current CPU temperature:
cat /sys/class/thermal/thermal_zone0/temp
RTC
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The operations below requires root access. |
Execute the following command to set the date and write it into the RTC do the following:
root@cl-som-imx8x:~# date -s "12 SEP 2019 10:00:00" Thu Sep 12 10:00:00 UTC 2019 root@cl-som-imx8x:~# /sbin/hwclock --systohc root@cl-som-imx8x:~# hwclock -w
Execute the following command to access the RTC time and date run:
root@cl-som-imx8x:~# hwclock Thu Sep 12 10:00:48 2019 0.000000 seconds
