Elo touchscreen raspberry pi emulator

Allows control devices remotely through network. The emulator is made according to this manual. On how to enabled g_hid support on raspberry see this.

Installation

I use the latest Raspberry Pi OS version within Raspberry Pi Zero W. For the moment it's Linux raspberrypi 4.19.118+ #1311 Mon Apr 27 14:16:15 BST 2020 armv6l GNU/Linux.

1. Copy the content of the configfs folder to any place you like around the system. Also put touch-control/touch-server.sh to anywhere you wish. I use /usr/local/lib/gk directory.
2. Then edit /etc/rc.local (the easiest way to execute something on system start with root privileges by default). Add these lines before the exit 0 statement.

/usr/local/lib/gk/setup-elo.sh
/usr/local/lib/gk/touch-server.sh &

Control the touchscreen

In the touch-control folder there is an example GUI for controlling touchscreen. To start it's necessary to install tkinter for python3.

sudo apt install python3-tk
pip3 install -r requirements.txt

Then run it by passing ip address of your raspberry e.g. ./app.py 192.168.1.77.

API to the touchscreen are in the elo.py.

import socket
from elo import send_touch, send_move, send_release, send_tap

sock = socket.socket()
sock.connect((host, port))

# makes touchscreen to produce tap 
send_tap(sock, x, y)

...

# for detailed control use these
send_touch(sock, x, y)
send_move(sock, x + 100, x + 100)   
send_release(sock, x + 200, y + 200)

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Note

Moving also works without touch/release, but original elo device sends them at the begin/end of sequence. Not aware about any side effects of skipping them.

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Tests

Run pytest in touch-control folder or in the repo's root.