Template: GPM28040-Manual

Features

• 2.8inch IPS Screen, 640×480 pixel, 70% NTSC color gamut
• 60fps smooth gaming experience
• Fully laminated toughened glass panel, anti-fingerprint technique
• Compatible with CM4 series
• Indicators for batteries
• Game ROMs Are Updatable Via WiFi

B

【Note】The battery life indicators indicate the battery power of the GPM28040 through the three colors of green, blue, and red from high to low.

Pre-configured Image

1)Download the zip file to the PC, and unzip it to get the .img file.

OS	Revision	Raspberry Pi	User name/Password	Link
Retropie	v4.7	CM3 \ CM3+	user: pi \ password: raspberry	Onedrive link

2) Connect the TF card to the PC, use SDFormatter.exe software to format the TF card.

3) Open the Win32DiskImager software, select the system image downloaded in step 1, and click ‘Write’ to write the system image.

4) After the image has finished writing, insert the TF card into GPM280, turn on the switch, and then the system will start normally.

【Note】If the battery power is too low (the indicators flash red light or the indicator lights is off), the system will not be able to start. In this case, you can charge the GPM280 by connecting a 5V 3A power adapter to the Micro USB interface. The indicator lights will flash when charging, and the GPM280 supports charging while playing games.

Configure image manually (Retropie)

1. Download the newest Retropie image(the GPM280 can support Retropie 4.7.1 now) from the official website, and unzip it to get the .img file.

2. Connect the TF card to the PC, use SDFormatter.exe software to format the TF card.
3. Open the Win32DiskImager software, select the system image downloaded in step 1, and click‘Write’ to write the system image.
4. After the image has finished writing, open the config.txt file in the boot directory of the TF card, add the following code at the end of config.txt, then save and quit the TF card safely.

dtparam=spi=off
dtparam=i2c_arm=off
gpio=0-27=a2
dtoverlay=dpi24
enable_dpi_lcd=1
display_default_lcd=1
dpi_group=2
dpi_mode=87
display_rotate=3
dpi_output_format=0x7F217
hdmi_timings=480 0 26 16 10 640 0 25 10 15 0 0 0 60 0 32000000 1
extra_transpose_buffer=2
hdmi_ignore_edid=0xa5000080
dtoverlay=gpm280-pwm-audio

5. Download the GPM280 DTBO and extract 1 dtbo file. Copy this file to the /overlays directory (/boot/overlays/).
6. Download the GPM280 WIFI and extract two files. Copy these two files to the /boot directory of the TF card.
7. And then open wpa_supplicant.conf which you have copied on the /boot directory, modify the USERSSID and the USERPSK to the SSID and password of the WIFI you want to use.
8. Save the file and quit the TF card safely.
9. Insert the TF card into the GPM280, turn on the power switch, and wait ten seconds to enter the system normally.

Buttons Configuration

• After the system is started, you will enter the WELCOME interface
• Long press the “A” button (other keys are OK as well) to enter the buttons configuration page.
• The UP\DOWN\LEFT\RIGHT options correspond to the Cross button. You can long-press A to skip the unused buttons. After configuring A\B\X\Y\START\SELECT\L\R, please note that the last HOTKEY selects the SELECT button by default, and then press A to finish the configuration.

Expand Storage Space

• Please enter the CONFIGURATION menu, and select RASPI-CONFIG.
• And then select Advanced Options, select <Select> by the Cross button left and right, press B to confirm.
• After selecting A1 Expand Filesystem, press B to confirm, and restart the system.

IP address

• Enter CONFIGURATION and then select SHOW IP, you will see the IP address on the GPM280.

Connect to GPM280 via sftp

• Open FileZilla or other similar software, enter the IP address obtained in the previous step.
• User name: pi Password: raspberry, port: 22, and then you can connect to GPM280, as shown in the picture below.

Safe Shutdown

• Press the START button on the menu interface and select QUIT-> SHUTDOWN SYSTEM.

For more details of the Retropie please refer to Official documentation.