Hello,
Plutôt que d’appeler ce sujet PiPi, j'ai préféré l'appeler Pi², vous allez comprendre.
Je me demandais s'il était possible de mettre en réseau deux Raspberry Pi pour faire tourner une recalbox, et ainsi bénéficier de plus de patate pour l'émulation, ou si c'est une impossibilité technique totale ?
Merci pour vos réponses !
La télé est le seul écran branché sur le pi ?
@substring said in Feature Suggestion: Game played (Marker):
@tormentor667 2 icons would mean rewriting ALL themes
1 icon. 3 images.
@toxicooow this is plugged through i2c on GPIO, not another bus ?
Juste pour dire que j'ai des couilles d'apairage moi aussi, depuis que j'ai fait la dernière mise à jour quand j'ai commencé à mettre le rpi sur le réseau wifi (mais la maj est peut être une coïncidence). Je n'ai pas le système depuis longtemps, j'ai eu mon rpi 3 pour Noël 
Je ne peux simplement plus jouer en Bluetooth avec une manette de PS3. Et je galère pour que la manette soit reconnue même en filaire (je remap les boutons à chaque redémarage, et ça marche une fois sur deux environ).
Avant, je faisait un truc du style en passant par le dongle bluetooth du clavier =>
Là, le remap marche donc une fois sur deux et j'ai bien du essayer 20 fois d'appairer, sans succès. Même en oubilant le bidule, redémarrant, appairer, que dalle.
C'est pas si grave (je suis à l'ancienne, j'ai pas pris l'habitude de jouer en BT) mais bon.
Yeah, you should try to use RCA cable like here I guess. I think there's a problem of bandwidth : a 800*600 CRT screen have 480k pixel. A pixel use 24 bits of information.
If you want 30 images per second that is 480000 (all pixels) * 24 (bit per pixel) * 30 (images per secodns) = 345 600 000 bits per second aka 345.6 Mbps.
This is meaning you need at least a category 6a copper pair cable.
I'm making assomptions, but if it's just a cheap chineese copper pair, then you will have LOTS of white noise, because of physical stuff I don't want to bother you with.
You would have white noise in the image and in the sound (white noise in image is your classic CRT "snow", and white noise in sound is the sound from that snow screen).
In the image, it's a pixel or another that won't be displayed for 1/30 of a second, you just would notice a bad image stability/quality. But for sound you would hear that very clearly, because it's a 1D signal. This would be "either signal is ?wtf? either it's ok", instead of "just THAT pixel for a 1/30 of a second", in burst.
(sound on top is just about +1Mbps (+192Mops, but I'm really not sure here), this means 6a is still ok. 6a was made for video anyway.)
Check with a RCA (that one), or 2x 6a pair ! 
Oh, and honestly, I'd also try to stay with PAL instead of NTSC. It's better for signal/noise, and it seems this is your main problem there.
If it boot on gpu, then everything is explained ?
"don't take any risk (see what I did there ?) with the booting chip" on top of "things must not be peripherical dependant" which combos in "booting chip must not be peripherical depending"
This booting on gpu is surprising, but not totally from outer space when you considering pi's ARM nature
@Substring
I think it's possible to achieve what your usual computer does. There's no impossibility, but a lot to learn before doing that : to do this right, you must take this before kernel. I would have to document myself on that before coming with questions. IRQ is already little known territory to me, but ARM board IRQ may be very much alien space in my Windows guy's eyes : I learnt how from a pile of sand making something this is driven by hardware or asm drivers 20 years ago, there should be remains
@substring hey
@substring I don't really understand.
I have maybe 2 full days of googling-fu this problem and nobody clearly wrote "hey guys, here is all the solutions for the dudes that bough the official 7'' screen, are total noobs at raspi, and also use recalbox".
There is no flaw in the firmware. It's by design. The screen have been made by specialists ingeneers that perfectly understand how EDID & low-level drivers works. So to their eyes, it's working flawlessly. You can ouput to whatever thing you like, if you can program before config, the behaviour is like "boot'n play".
If I can find how to do event programing, find the plug HDMI event, threading that with a simple if each second, I could even make that plug'n play, at least in Rasbian. This is what plug'n play drivers does, the only difference is they use interupt drivers level but you can make that easely post-kernel too if you're a raspi noob like me.
(background info : studied electronics, then been in informatics for like 15 years)
@substring I agree but why do you say people need noob skills with recalbox then ? It's one or the other ?
@Substring for the "plug'n play on any screen", I think I have a solution, but it would need to find a way to execute a bash script before the config.
So we could dynamically create an EDID= with the name of the HDMI screen obtained through tvservice -n (and also power off the lcd if tvservice give a result with other bsh commands)
I don't even know if this is possible. I'm very noob there.
But I know it's possible to add sub config files with something like "include subconfig.txt", the idea there would be to tvservice -n then create a file with either
[EDID=tv_name_you_got_with_tvservice]
display_default_lcd=0
[all]
Or either
[all]
Name that toto.txt, then put include toto.txt on the top of your config.txt and that should output to any HDMI screen if an HDMI is plugged (and if possible, power off the LCD), or to your LCD if not.
About the stability / usability / speciality to put that in recalbox, I'd agree. The only thing is finding that info was VERY difficult (but once understood, it was so easy). It would be at least a good thing to put in the faq I think.
@paulo-presa-evangelista recalbox.config is not the recalbox config.txt file.
The setting you are talking about are to be put in the /boot/config.txt file
recalbox.config or whatever the real name is contains a USB name and the timer Recalbox use to "ping" it. Maybe other stuff, but no videostuff
@jidem @Nijate and....... bingo.
I've got it, I'm so happy.
First, you need to know what is the name of your HDMI screen. For that, plug HDMI, boot, then open console (for exemple in Rasbian) then type :
tvservice -n
(tvservice works too with a recalbox console : I say that because I'm a total noob in Linux and I think I'm not alone)
=> this will give your TV name like that :
device_name=THIS_IS_YOUR_TV_NAME
Note that name on paper (or take a photo : mine was SNY_SONY-TV, and never could remember if - was before _)
Then, open config.txt in Rasbian and on the very very top of the file, you put those 3 lines :
[EDID=THIS_IS_YOUR_TV_NAME]
display_default_lcd=0
[all]
What will happen there is when the Raspi detect on boot the TV, then it will use the next lines in the config.
Then it found the [all] filter that is used by default when there is no filter.
Therefor, display_default_lcd=0 will only be used when my TV is plugged on boot. Since that line happens to make the output on the HDMI, this is perfect : when HDMI is plugged, then the raspi will boot on HDMI else, it will boot on LCD.
Ok. This is not finished. This will only work with Rasbian.
You have to go in recalbox's /boot, and copy the same 3 lines on the very top of your config.txt file there so recalbox boot with the same behaviour.
It s NOT finish... I know there is a config command to power off the lcd. If you find it, you can put this between the [EDID=...] and the [all] filter so it power off the LCD if you use the HDMI output.
I think this is the solution !
(also, @Substring if this is the real solution and that does not work only for me, this could be automated in recalbox ? before the boot, use tvservice to know if something is plugged and [EDID=that stuff] then [all] the rest of the config file)
The solution was REALLY simple in fact. So simple that it's hard to notice just under our noses
@jidem NOT YET, SNAKE, IT'S NOT OVER YET!!
I can make it boot with Rasbian on HDMI or 7'' whether the HDMI is plugged or not
I'm making more tests to be sure.
Which are "display_default_lcd=0" disables LCD instead of making HDMI default ?
I must try removing those from the recalbox config file, and the rasbian config file, and only rely on the NOOBS config file.
I saw while browsing recalbox that some line are added by NOOBS... There should be a conflict somewhere (including @Nijate orignal problem).
This is really really bothering. We have all the commands that does things right, and none can be used there.
@jidem you're right, this is an easier test => well
"SDL and SDA wires" unplugged :
+HDMI plugged in :
+HDMI not plugged :
"SDL and SDA wires" plugged :
+HDMI plugged in :
+HDMI not plugged :
Blackscreens with unwired should be the same I guess.
D**n. It's been two days I play on TV thinking this was a solved problem :3
If the 7'' screen is in normal position on your table (HDMI output on top) :
Ok.
Now if you look this square shape : top left, I have yellow, top right blue, bottom left is black, then I have red.
On the screen, there is 4 (if I remember ?) pins which are from left to right : black yellow green red. So yellow & green use the two spot between your typical 5v/GND (which if I done things right, are red / black in what I did).
I really can't find the documentation, but the color of these threads are typical of I/O lines (so that's why I'm telling this is it).
@coincoin said in Switching image from LCD to HDMI when connected:
@jidem Bah ça boot avec la sortie HDMI si c'est branché, sinon, ça boot sur le LCD.
Je me prennais la tête franchement en me disant "mais si j'essaye, ça va sortir re-inversé verticalement" mais non !Donc il suffit de coller la ligne qui va bien pour inverser l'écran, et celle -là pour que ça marche parfaitement. Maintenant, le truc casse-pied, c'est le petit écran qui est allumé en noir pendant la sortie HDMI, je crois que je vais être obligé de bricoler un interrupteur comme toi, mais j'ai pas envie...
-edit- ah si : au début, y a NOOB qui sort àl'envers sur le 7''. Tu choisi recalbox et après ça sort en HDMI dans le bon sens.
==> translation because it seems I can't edit after one hour :
Well, it's booting with the HDMI output if it's plugged in, otherwise, it's booting on the LCD.
I was frankly thinking "but if I try, it's going to come out inverted vertically" but no!
So all you have to do is paste the line that goes well to invert the screen, and this one will work perfectly. Now, the puzzling thing is the small screen that is lit in black during the HDMI output, I think I'm going to have to tinker with a switch like you, but I don't want to...
edit- oh yeah : at first, NOOB comes out upside down on the 7''. You choose recalbox and then it comes out in HDMI in the right direction.
@jidem mmm I can't find the doc and i don't want to tell you s**t stuff 
@paradadf sorry.
I will edit and translate my posts soon.