Retropi + GPIO = Not Working (Using adafruit more info in post)

hiulit · 16 Oct 2017, 08:40

@r0shen Don't worry, no need to apologize :)

Yes, you can wire up to any BCM number.
You also need to connect the joystick and all the buttons to GROUND.

hiulit · 16 Oct 2017, 08:47

@r0shen Here, a pic with the GPIO pinout (here it says GPIO instead of BCM)

And how it looked like when I was starting my project :)

R0shen · 16 Oct 2017, 11:45

@hiulit
Eyyy!! Thank You SOOOOOO Much I got it working currently enjoying some donkey kong Thank You sooo much haha :)

hiulit · 16 Oct 2017, 14:20

@r0shen Alright!!! :D I'm glad you're enjoying some retro games!

R0shen · 17 Oct 2017, 05:46

@hiulit
If I was to do a 2 player is their an adafruit gpio code to make 2 joysticks and 3 buttons on either side work?

hiulit · 17 Oct 2017, 06:43

@r0shen You can tweak the same file and add as many KEY/GPIO values as you want.

R0shen · 17 Oct 2017, 09:08

@hiulit
Where would you add the duplicate joystick and three buttons?

hiulit · 17 Oct 2017, 14:08

@r0shen Below the KEY/GPIO values you already have.

You just need to assign new values. Example:

W    21 # 2 player UP
S    22 # 2 player DOWN
A    23 # 2 player LEFT
D    24 # 2 player RIGHT
P    25 # 2 player 'A' button
etc...

and so on.

P.S. This example is completely made up! ;) But you get the idea, right?

R0shen · 18 Oct 2017, 04:55

@hiulit
So the name such as 2 player UP
2 player DOWN does it matter what it's named? or does the name correspong with something in retropi? and also would you know in retro pi where to configure an extra joystick and duplicate buttons (e.g. 2 x buttons 2 y buttons and so on)

hiulit · 18 Oct 2017, 07:48

@r0shen No, those are comments. Everything that comes after a hashtag # is a comment. So it doesn't matter what you write there. It's just so you know what the key represents.
And for the second question, I don't know, but you could take a look at the docs https://retropie.org.uk/docs/RetroArch-Configuration/ maybe you'll find something there :)

R0shen · 18 Oct 2017, 11:09

@hiulit
So All it does is make each GPIO number a keystroke and you just wire your controlls to it and use the keystroke as up down left right button a b x y and so on. You just write what it is to know whats in that GPIO number right? anyway to add more of the GPIO pins to that code?

Raccoon · 26 Oct 2017, 11:54

Hi there ^^,
I´m new here and I seriously need help. I´m doing an Internship right now and my finishing Project is trying to build my own MintyPi, whith a Raspberry Pi Zero. The emulation Station is working, with an extern USB Controler.
I soldered my own board for Buttons. And I checked the Buttons funktion. They´re doing their job.
I installed the new image and everything.

I´m totally new to Raspi and Linux.
For 5 Days now, I tried to configurate the Buttons: A, B, X, Y, UP, DOWN, LEFT, RIGHT, START, SELECT, L, R
I loaded down the Adafruit retrogame and loaded the PiGRRL Zero.
Looks kind of like this:

LEFT 27 # Joypad left
RIGHT 22 # Joypad right
DOWN 5 # Joypad down
UP 4 # Joypad up
Z 14 # 'A' button
X 16 # 'B' button
A 21 # 'X' button
S 20 # 'Y' button
Q 12 # Left shoulder button
W 6 # Right shoulder button
LEFTCTRL 19 # 'Select' button
ENTER 17 # 'Start' button

these numbers are the bcm i read out over
gpio readall
I also tried the GPIO pins from the coulerfull picture earlier in the chat:

LEFT 27 # Joypad left
RIGHT 22 # Joypad right
DOWN 05 # Joypad down
UP 04 # Joypad up
Z 21 # 'A' button
X 16 # 'B' button
A 26 # 'X' button
S 20 # 'Y' button
Q 12 # Left shoulder button
W 06 # Right shoulder button
LEFTCTRL 19 # 'Select' button
ENTER 17 # 'Start' button

But the only thing that works as said is ENTER 17, this is the only button working correctly.
on the last setting the
X button does LEFT
Y button does DOWN
L button does UP (but not always)
and the others are doing nothing

So my guess is that the pins might be correct but the commands LEFT, RIGHT, etc.
are not assignt correctly.

I would be really gratefull O3O
if you could help me find a solution.

Raccoon · 27 Oct 2017, 10:06

So I actually found an smal pice for a solution. Turns out I had a german keyboard configured.
The Adafruitprogramm, seems to take the keys from the keyboard an transfers it to my own buttons. Since I used an german keyboard it didn´t work. I changend to us keyboard, but that didn´t work either. I´m back to german keyboard now. So I changed the Names of the Keys:
A 27 # Joypad left
D 22 # Joypad right
S 5 # Joypad down
W 04 # Joypad up
? 21 # 'A' button NUM6
? 16 # 'B' button NUM5
? 26 # 'X' button NUM4
? 20 # 'Y' button NUM8
? 12 # Left shoulder button must be the 3§³ Key
"+" 6 # Right shoulder button on NUM+ + without the ""
#' 19 # 'Select' button must be the '# Key
ENTER 17 # 'Start' button

So far, so good.

My new Problem is that I don´t know the correct names of the keys needed.
Does anyone of you know where i could find them?

Would be great if anyon could answer :D

hiulit · 2 Nov 2017, 08:07

@raccoon Here you go:

dizmodawg · 2 Nov 2017, 01:50

Is there some body who could make a youtube video on how to retrogame and program the buttons to the gpio pins? I'm almost done with my cabinet and i have a arcade only build and not want to use a game pad encoder. I want to use gpio pins but am a noob. Also i am using a pi 3. I found this and this is how i want mine.

Raccoon · 2 Nov 2017, 08:07

@hiulit Tanks!!! It worked :D

hiulit · 2 Nov 2017, 16:15

@raccoon Nice!! I'm glad it worked! :D

buntyfarmer · 12 May 2020, 17:40

Hi,

I have followed much of the same process as on here, I have up/down/left/right/a/b/x/y all working ok.

Start and select don't work however. In the config file I have the following:

SELECT 6 # 'Select button'
START 16 # 'Start button'

I noticed in the list of commands does not include 'start' and 'select' (i looked at the kerTable. file referred to on adafruit tutorial) so maybe it should be SPACE and ENTER, I tried this but still does not work in emulationstation or when playing a game.

Any ideas?

I am just using arcade buttons and a joystick.

Just to check, does the part after the # matter? I thought this was just a reference in the code to the person reading it so they knew what that button/PIN did.