6. Android Application

6.1 Display

Connect the board and monitor, then start up. EM3288 supports Dual-screen display (HDMI/LVDS).

6.1.1 Dual-screen different display

Settings -> Display -> HDMI -> Turn On, check dual screen and Vice screen rotation

Press and hold volume + and volume simultaneously and hold for 2 seconds.

The same operation can exit the different display mode.

6.1.2 Miracast

Miracast is a wireless display standard designed for mirroring a smartphone, tablet, or PC’s screen to a television without requiring any physical HDMI cables.

Miracast using WiFi protocol, it must be connected to the same WiFi.

Settings -> Display -> Cast -> Check Enable wireless display

6.2 SD Card

EM3288 supports SD Hot-plug.

6.3 USB Host

The USB2.0 Host can be used to connect USB mouse, USB keyboard, U-Disk or other USB devices. Support Hot-plug.

6.4 Video&Audio Player

Copy video file to SD_card/U-disk then insert it to the board. Click Video icon and select multimedia file to play.

6.5 Ethernet

Connect the board and router with an Ethernet cable (default DHCP=Yes). User can ping URL/IP at terminal, or open the browser to test Network.

su
ping www.boardcon.com

6.6 Record

EM3288 supports recording via line-in(headset) or differential MIC. Default MIC recording. It will switch to the Line_in recording automatically if inserted the headset.

Open the APP Sound Recorder in Android.

Click Start button to start recording.

After finish recording, click Stop and Save to store file.

The default storage path is Internal Memory/Android/data/com.android.soundrecorder/files/Download

Audio output priority: Headphone > HDMI

6.7 RTC

Execute the command hwclock at CRT terminal to query hardware clock

busybox hwclock

6.8 WiFi

Connect the WiFi antenna, then click Settings -> Network&internet -> Wi-Fi -> turn on, select the SSID from the list of available networks and enter the password.

After connected, user can ping URL/IP at terminal, or open the browser to test Network.

6.9 Bluetooth

Click Settings -> Bluetooth -> turn on

Select the available device in the list to pair.

6.10 4G

Step 1, Insert 4G module to PCIe slot (4G model: EC20/EC25).

Step 2, Connect antenna and insert SIM card.

Step 3, Power on. The default network connection is 4G network.

4G network settings

Settings -> Wireless&networks -> More -> Cellular networks -> Preferred network type -> LTE

6.11 GPS

EM3288 4G module combines high-speed wireless connectivity with embedded multi-constellation high-sensitivity GPS+GLONASS receiver for positioning.

In addition, the development board also supports a standalone GPS module(Model: ST-91-U7).

Connect GPS antenna, then power on and install the APP /Tools/GPS_test1.2.4.apk

6.12 Camera

Connect the camera module (OV13850) to the development board before power on, then click the camera APP to test.

6.11 UART

The UART loopback test is for reference only.

Step 1, push the file com to the test board via ADB

adb root
adb remount
adb push \xx\com /system  //\xx\ is the absolute path to store com
adb shell
chmod 777 /system/com    //Modify com properties

Step 2, connect the transmit (TX) pin to the receive (RX) pin of UART1

Step 3, after executes the command, input character to test UART

./system/com /dev/ttyS1 115200 8 0 1  //Test UART1

6.12 SATA

Connect the SATA and SATA-power to the development board before power on，then the SATA will auto mount.

Since SATA requires a relatively high current, the SATA power supply on the EM3288 may not provide sufficient current, leading to instability. Therefore, it is advisable to provide SATA power externally.