GB Null

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Re: GB Null

Post by superbuzz » Wed Aug 21, 2019 6:51 am

Hey & - not sure if this is the right place for Null2 .....

I got the Null2 booting and working fine, but when I go into Wifi config menu suddenly I can't select any options - I can use up down etc and the highlighted option moves, "A" no longer works as a confirm button and I can't exit out of the menu either. I also tried start, select, system, abxy. no effect to confirm or to exit back into the main retropie menu. Ended up have to shut down to get out of it.

Sounds like a button mapping issue again...but given that I could get some GB games working as expected....I'm not really sure.

The larger screen is great btw! looks lovely!

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Re: GB Null

Post by DynaMight » Sat May 30, 2020 7:14 am

I'm sure no-one probably cares but I spent a few hours messing with my GB Null (original, not 2) It had an older version of Retropie and I wanted to try 3.6 so spent some time updating the stock retropie image and thought I'd share incase anyone wants to do it. This wont work fully with the GB Null 2, but you could fairly easily workout the changes.

Firsly, download the latest Retropie image for the RPI1/Zero and flash to a SD card. Before plugging it into the GBN, open the boot drive as you'll want to make some quick changes to get SSH and Wifi working on first boot.

First thing, create a file called 'ssh' without any file extension. I usually create a ssh.txt then delete the file extension. After that create a file called "wpa_supplicant.conf" and paste:

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ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev

    ssid="YOUR SSID"
Obviously enter your SSID and password, then save.

At this stage you can also update the config.txt with the below stuff if you want. Up to you.

Put the SD card into the GBN, wait a few minutes to resize and fully boot (Screen will remain white, thats normal). Find the IP address its been assigned, you can do this via your router admin page.

Download Putty or your SSH program of choice, connect via SSH. Usual pi/raspberry user/pass. If you've never used nano before, use the arrows to move around, delete key to delete, in putty atleast I copy, then right click to paste and finally to save, press CTRL+X.

First part is to get the screen working.

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cd ~
git clone
cd rpi-fbcp/
mkdir build
cd build/
cmake ..
sudo install fbcp /usr/local/bin/fbcp

cd ~
tar zxvf bcm2835-1.59.tar.gz
cd bcm2835-1.59/
sudo make check
sudo make install

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sudo nano /etc/modules
Add lines:

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sudo nano /etc/modprobe.d/fbtft.conf
Add line:

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options fbtft_device name=fb_ili9341 gpios=reset:25,dc:24,led:18 speed=80000000 bgr=1 rotate=90 custom=1 fps=60
Thats the screen setup.

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cd ~
curl >
sudo bash
Choose option 2, no to reboot.

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sudo nano /boot/retrogame.cfg
Replace code with:

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LEFT      04  # Joypad left
RIGHT     17  # Joypad right
UP        15  # Joypad up
DOWN      27  # Joypad down
LEFTCTRL  22  # 'A' button
LEFTALT   23  # 'B' button
Z         02  # 'X' button
ENTER     13  # 'Start' button
SPACE     16  # 'Select' button
X         03  # 'Y' button
A         06  # 'L' button
S         12  # 'R' button
ESC       05  # Exit button
Thats the controller setup.

Now for the config.txt

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sudo nano /boot/config.txt

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hdmi_cvt=320 240 60 1 0 0 0

Now onto the reboot script.

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cd ~
mkdir Scripts
cd Scripts
sudo nano
Paste in:

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#shutdown with a button

import RPi.GPIO as GPIO
import time
import os

GPIO.setup(5, GPIO.IN, pull_up_down = GPIO.PUD_UP)

def Shutdown(channel):
	os.system("sudo shutdown -h now")

GPIO.add_event_detect(5, GPIO.FALLING, callback = Shutdown, bouncetime = 2000)

while 1:
Lastly is getting it all to start on reboot:

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sudo nano /etc/rc.local
Add these, just before exit 0. P.S. the Retrogame will be there already.

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/usr/local/bin/fbcp &
/usr/local/bin/retrogame &
sudo python /home/pi/Scripts/ &
Sudo reboot and everything should work, you will need to setup the controls. This will get you to where the stock GBN image is but on 3.6.

If you want a few extras like ability to toggle BT and Wifi, which will save a fair amount of battery, then follow this guide: ... opie-menus (the reply by thex)

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