Step 6

You will now be assigning keyboard inputs to action buttons of the controller (GPIO pins on the Raspberry Pi)

RetroGame Configuration

Edit the RetroGame configuration file

sudo nano /boot/retrogame.cfg

You can replace the entire file with the following

pro tip:Hit CTRL+K on you keyboard to delete lines*

# Here's a pin configuration for the PiGRRL 2 project:
LEFT          22  # Joypad left
RIGHT         20  # Joypad right
UP             7  # Joypad up
DOWN          12  # Joypad down
LEFTCTRL      19  # 'A' button
LEFTALT        5  # 'B' button
Z              6  # 'X' button
X             13  # 'Y' button
RIGHTSHIFT      26  # 'Select' button
ENTER         16  # 'Start' button
A             18  # Left shoulder button
S             27  # Right shoulder button
Q             15  # Left trigger button
W             17  # Right trigger button
ESC           16 26  # Exit ROM; PiTFT Button 1

Hit 'CTRL+X' and 'Y' to confirm the save

EmulationStation Input Configuration

This is really just a visual check to ensure your file looks as below

Open the EmulationStation Input configuration file

sudo nano ~/.emulationstation/es_input.cfg

Ensure that your file's content are exactly as below

<?xml version="1.0"?>
<inputList>
  <inputAction type="onfinish">
    <command>/opt/retropie/supplementary/emulationstation/scripts/inputconfiguration.sh</command>
  </inputAction>
  <inputConfig type="keyboard" deviceName="Keyboard" deviceGUID="-1">
    <input name="pageup" type="key" id="97" value="1"/>
    <input name="start" type="key" id="13" value="1"/>
    <input name="up" type="key" id="1073741906" value="1"/>
    <input name="a" type="key" id="1073742048" value="1"/>
    <input name="b" type="key" id="1073742050" value="1"/>
    <input name="down" type="key" id="1073741905" value="1"/>
    <input name="pagedown" type="key" id="115" value="1"/>
    <input name="right" type="key" id="1073741903" value="1"/>
    <input name="x" type="key" id="122" value="1"/>
    <input name="select" type="key" id="1073742053" value="1"/>
    <input name="y" type="key" id="120" value="1"/>
    <input name="left" type="key" id="1073741904" value="1"/>
  </inputConfig>
</inputList>