6. Buildroot Application

6.1 HDMI Display

Connect the board and monitor with a HDMI cable, then start up.

Note

The Boardcon factory default HDMI display. If change to LVDS/MIPI please reflash boot.img.

10.1” MIPI LCD: boot-10.1inch_mipi.img

10.1” LVDS LCD: boot-10.1inch_lvds.img

7” LVDS LCD: boot-7inch_lvds.img

HDMI: boot-hdmi.img

6.2 SD Card

The SD card is automatically mounted. EM3566 supports SD Hot-plug.

df -h
ls /mnt/sdcard

6.3 USB Host

The USB Host can be used to connect USB mouse, USB keyboard, U-Disk or other USB devices.

df -h
ls /mnt/udisk

6.4 Video Player

Copy video file to SD card or U-disk then insert it to the board.

Test 1920x1080 (1080P)

gst-play-1.0 --videosink=xvimagesink XXX   //XXX is file path

Test 4K (max-fps to 50fps)

export GST_MPP_VIDEODEC_DEFAULT_ARM_AFBC=1              //set AFBC
cat /sys/kernel/debug/dri/0/state | grep "plane\["      //view the plane id (select Cluster0-win0)
GST_DEBUG=*mpp*:4 gst-play-1.0 --flags=3 --videosink="kmssink plane-id=70" /XXX         //play video. XXX is the file path
GST_DEBUG=*mpp*:4 gst-play-1.0 --flags=3 --videosink="kmssink plane-id=70" /mnt/sdcard/4K.mp4 --audiosink="alsasink device=hw:1,0"   //Specify audio channel output

6.5 Ethernet

Connect the Board and router with an Ethernet cable (default DHCP=Yes). User can ping URL/IP at terminal.

eg.

ifconfig
ping www.boardcon.com

6.6 Record

Execute follow command to start recording, speech in front of the microphone then can record.

aplay -l       //view audio equipment
arecord -Dhw:0,0 -d 10 -f cd -r 44100 -c 2 -t wav test.wav    //start recording
aplay test.wav         //play record file through HDMI
aplay -Dhw:1,0 test.wav       //play record file through earphone

6.7 RTC

Execute the command hwclock at CRT terminal.

date -s "2022-12-06 12:00:00"     //set system time
hwclock -w           //synchronize system time and RTC time
hwclock

Wait a minute then run hwclock again, it can be seen the time has changed.

6.8 WiFi

Connect the WiFi antenna, input SSID and password to test.

ifconfig eth0 down
wifi__start.sh SSID Password  //input your SSID and password
ifconfig
ping www.boardcon.com

user also can execute the following commands to test wifi

ifconfig eth0 down
ifconfig wlan0 up
iwlist wlan0 scan             // search hotspot
vi /etc/wpa_supplicant.conf   // configure the wireless hotspot to be connected
wpa_supplicant -B -c /etc/wpa_supplicant.conf -i wlan0    //restart wifi and connect to the hotspot

ifconfig
ping www.boardcon.com

6.9 Bluetooth

Execute the command to open Bluetooth.

hciconfig hci0 up
hciconfig -a
hciconfig hci0 iscan        //allow Bluetooth to be searched
hcitool scan
bluetoothctl                //allow Bluetooth to be pairable

click bluetooth BlueZ 5.62 in phone to pair. Input yes

connect 38:89:2C:24:FB:64     //connect bluetooth
trust 38:89:2C:24:FB:64       //trust bluetooth

6.10 RS485

This test method is only for reference.

Step1, connect the RS485 ports of Board A and B with the test line.

Step2, push the file com into board A and board B via ADB

adb push \xx\com /system      //\xx\ is the absolute path to store file
adb shell
chmod 777 /system/com         //modify com properties

or copy com to SD card and then insert it to the card slot. Powered on, after the system boot, execute the command to copy com from SD card to the board.

cp /mnt/sdcard/com /system
ls /system
chmod 777 /system/com         //modify com properties

Step3, after execute command at Serial terminal. Input character to test RS485 communication

./system/com /dev/ttyS3 115200 8 0 1

6.11 UART

The UART loopback test is for reference only. connect the transmit (TX) pin to the receive (RX) pin of UART. after executes the command, input character to test UART.

./system/com /dev/ttyS4 115200 8 0 1          //test UART4

Press Ctrl+C to exit UART4 testing, execute the command to test UART5.

./system/com /dev/ttyS5 115200 8 0 1        //test UART5

6.12 M.2 SATA

Format SSD to ext4 file system on ubuntu system

ls /dev                              //view the SSD device name
mke2fs -t ext4 /dev/nvme0n1         //format ssd to ext4 file system on ubuntu OS

Execute the command to mount SSD.

mkdir /mnt/ssd
mount -t ext4 /dev/nvme0n1 /mnt/ssd  //mount SSD
ls /mnt/ssd

6.13 4G

ifconfig eth0 down           //turn off eth0 to avoid DNS conflicts
cd /etc/ppp/peers
pppd call quectel-ppp &      //realize ppp dialing
ifconfig                     //view the network status
ping www.boardcon.com        //check the connectivity of the network

6.14 GPS

Execute the command to test GPS (integrated in 4G model).

echo -e "AT+QGPS=1\r\n" > /dev/ttyUSB2
cat /dev/ttyUSB1

6.15 IR

Connect IR receiver to the IR connector. Operate the IR controller and view the received data after execute the command..

echo 1 > /sys/module/rockchip_pwm_remotectl/parameters/code_print

6.16 ADC

Test SARADC_VIN2

cat /sys/devices/platform/fe720000.saradc/iio:device0/in_voltage2_raw

Connect SARADC_VIN2 to VDDIO_18, execute command again

cat /sys/devices/platform/fe720000.saradc/iio:device0/in_voltage2_raw

Connect SARADC_VIN2 to GND, then execute command

cat /sys/devices/platform/fe720000.saradc/iio:device0/in_voltage2_raw

Test SARADC_VIN3

cat /sys/devices/platform/fe720000.saradc/iio:device0/in_voltage3_raw

6.17 Camera(OV13850)

grep ov13850 /sys/class/video4linux/v*/name                 //check camera device number
grep "" /sys/class/video4linux/v*/name | grep mainpath
gst-launch-1.0 v4l2src device=/dev/video8 ! video/x-raw,format=NV16,width=1280,height=800, framerate=30/1 ! kmssink      //preview
gst-launch-1.0 v4l2src device=/dev/video8 num-buffers=100 ! video/x-raw,format=NV12,width=1920,height=1088,framerate=30/1 ! videoconvert ! mpph264enc ! h264parse ! mp4mux ! filesink location=/tmp/h264.mp4        //record video
gst-launch-1.0 -v v4l2src device=/dev/video8 num-buffers=10 ! video/x-raw,format=NV12,width=1280,height=800 ! mppjpegenc ! multifilesink location=/tmp/test%05d.jpg   //take a picture

the files are saved in /tmp