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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Fri Jul 12, 2019 2:10 pm 



Joined: 02 Mar 2017
Posts: 900
Does any store sell these already setup with the newest firmware? I would LOVE to try one out...but honestly don't have time (or the required energy) for a new project and learning how to do something else technical, program another device, etc. -- especially when I'm pretty happy with my OSSC, XRGB-mini, and DSC 301 HD setup I have going.


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Fri Jul 12, 2019 3:43 pm 



Joined: 08 Mar 2017
Posts: 851
Dochartaigh:
No stores yet from what I know, but I'd love to offer some service and get this into the hands of more people.
Some kind of partnership with an established shop would be great.

Well, but if you happen to be in the EU, I can build and send you a basic board.
With the other gear you have, you probably have all the cables and adapters already.

I'll quote myself from my last post so the question doesn't get lost to the page wrap:
rama wrote:
Hey guys,
I got to demo gbscontrol on an HD beamer today.
It performed well with very nice picture quality and all that, but I had 2 issues:

- 1280x960 and 1280x1024 presets cut off a bit from the top of the picture
- WiFi just refused to work at all once the console was powered. It immediately returned when the console was off.

Regarding the cut-off picture, do any of you guys get that from their displays as well?
It only affected 1280x960 and 1280x1024.

WiFi is a tough nut. It definitely didn't like doing AP mode in the demo. Maybe AP mode performs worse by default?
Going to investigate that.


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Tue Jul 16, 2019 2:08 pm 



Joined: 02 Jul 2019
Posts: 8
My board is 8220 v.3 that has orange pots and black buttons. I applied all rama's mod except ferrite bead mod and potiometers mod without success to eliminate random wavy interference from Playstation 2 system. It looks like this video -> https://www.youtube.com/watch?v=g8YYW_z3tBw. I just desolder 3 potentiometers today that almost eliminate wave interference (has some but barely noticable now).



I discover a trick to desolder 3 pins potentiometer easily. I use twiser and do moderate pull middle pin of pot and apply heat to the pin that can easily lift the pin up because pin metal is thin and easy to bend. After the middle pin left from hole it easy to desolder to 2 pins by bridge leads to heat both pins and life pots from PCB.


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Tue Jul 16, 2019 4:51 pm 



Joined: 08 Mar 2017
Posts: 851
I can't see any issues in that video, but here's something you can try:
Change the SDRAM clock in the web ui > system tab.


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Tue Jul 16, 2019 7:27 pm 



Joined: 17 May 2018
Posts: 26
rama wrote:
Dochartaigh:
No stores yet from what I know, but I'd love to offer some service and get this into the hands of more people.
Some kind of partnership with an established shop would be great.


I do offer them pre-built here in Brazil (with acryllic case). However they are not cheap (about US$ 120), since exchange rates and import taxes (up to 60%) make things really difficult. For those that speak portuguese, I have 3 videos on my YouTube Channel (https://www.youtube.com/user/rigues) showing how I built mine (first with an Arduino, them with a WeMos).


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Wed Jul 17, 2019 5:10 am 


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Joined: 07 May 2018
Posts: 391
Location: Escondido, CA, USA
rama wrote:
I can't see any issues in that video, but here's something you can try:
Change the SDRAM clock in the web ui > system tab.
Rama this is the first im seeing this advice. Ive got some mild waviness to the image that i havent been able to get rid of woth the various recommended mods that might affect it, quality cables all around. What do you recommend changing the sdram clock to?

Sent from my SM-G955U using Tapatalk


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Wed Jul 17, 2019 6:50 am 



Joined: 02 Jul 2019
Posts: 8
Hi rama, I tried your ram clock freq changing. It works best @144MHz or @122MHz. I think wave is less now but I notice some faint random wave when I move my face near the screen. It does not clean as vga signal from VGA port of PC video card. However, it does not noticable distract while regular viewing. I am very very happy for your gbs-control. Project is very fun and I am exciting everytime when I mention your work to my gamer friends. Thank you.


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Wed Jul 17, 2019 9:15 am 



Joined: 08 Mar 2017
Posts: 851
I haven't figured it out fully yet but here's my theory on it:
There's one Vcc and one ground plane from which the entire SOC draws power from.
The SDRAM requires several digital pins to toggle at high speed, causing disturbances in the Vcc and ground planes.
These disturbances affect the analog stages in the ADC and the DAC.
So far this isn't unusual.
Highest quality board designs would decouple the analog and digital stages and use filters, but this isn't the case on a GBS board.

So now we have data transfers that happen in a "beat": image data on active video, no data on blanking.
If the beat happens to align unfavourably to the digital noise, a wave pattern develops.
(Otherwise, it would be just very faint noise in the image.)

The SDRAM clock change alters one of the frequencies, sometimes preventing the "beat" + digital noise buildup.
The digital noise becomes just random noise again, and can't be seen on the display anymore.

There are a few ways to minimize visible noise, and I constantly tweak them so that my test boards don't show it.
But random chance parameters can make it so that some of you guys get noise by default anyway.
Change your SDRAM clock and save a custom preset then.
A proper hardware fix would certainly require new PCB and lots more cost.

Edit:
With regards to what SDRAM clock is best, you need to find one that works for you.
All clocks are valid and don't overspec the SDRAM, as there's a div2 clock divider step in every preset.
The chosen clock needs to be fast enough so that the picture doesn't distort, but it can be too fast, and then lots of pixel errors show up.
Between 108 and 188Mhz seems to work best for me.
Don't forget to test this in an interlaced source mode, as that enables the deinterlacer, which needs more bandwith.
Chose a clock that doesn't develop waves (or minimizes them) and that has minimal general noise in the picture.


Last edited by rama on Wed Jul 17, 2019 9:44 am, edited 1 time in total.

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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Wed Jul 17, 2019 9:25 am 



Joined: 08 Mar 2017
Posts: 851
rigues wrote:
I do offer them pre-built here in Brazil (with acryllic case). However they are not cheap (about US$ 120), since exchange rates and import taxes (up to 60%) make things really difficult. For those that speak portuguese, I have 3 videos on my YouTube Channel (https://www.youtube.com/user/rigues) showing how I built mine (first with an Arduino, them with a WeMos).

Best of luck with your service! :)

The price is unfortunate, but I can see lots of labor is involved. As long as it's still a good bit cheaper than alternatives, that's still good :)


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Wed Jul 17, 2019 11:30 am 



Joined: 17 May 2018
Posts: 26
tomrev wrote:
My board is 8220 v.3 that has orange pots and black buttons. I applied all rama's mod except ferrite bead mod and potiometers mod without success to eliminate random wavy interference from Playstation 2 system. It looks like this video -> https://www.youtube.com/watch?v=g8YYW_z3tBw. I just desolder 3 potentiometers today that almost eliminate wave interference (has some but barely noticable now).


Tom, it may not be related to your case, but I have found out that the power supply can introduce interference on the image. I have some cheap ones on my parts closet that make the image DANCE when used, looks like a raster effect. With good quality ones, the problem goes away. A ferrite choke on the cable, near the power input, greatly reduces the issue. Got some cheap ones on AliExpress a few months ago, around US$ 1 for 5 pieces: https://pt.aliexpress.com/item/32945880 ... b90a0WHTr2


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Thu Jul 18, 2019 2:02 am 



Joined: 02 Jul 2019
Posts: 8
rigues wrote:
tomrev wrote:
My board is 8220 v.3 that has orange pots and black buttons. I applied all rama's mod except ferrite bead mod and potiometers mod without success to eliminate random wavy interference from Playstation 2 system. It looks like this video -> https://www.youtube.com/watch?v=g8YYW_z3tBw. I just desolder 3 potentiometers today that almost eliminate wave interference (has some but barely noticable now).


Tom, it may not be related to your case, but I have found out that the power supply can introduce interference on the image. I have some cheap ones on my parts closet that make the image DANCE when used, looks like a raster effect. With good quality ones, the problem goes away. A ferrite choke on the cable, near the power input, greatly reduces the issue. Got some cheap ones on AliExpress a few months ago, around US$ 1 for 5 pieces: https://pt.aliexpress.com/item/32945880 ... b90a0WHTr2


I search ferrite choke around my home and found some. Picture looks a little bit more stable now. Thanks.


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Thu Jul 18, 2019 11:08 am 



Joined: 08 Mar 2017
Posts: 851
I agree with the power supply and ferrite tips. It's fairly often that I just twist my cables a little around the power input jack, and immediately the image changes.
(Time to clean the power connector and barrel then!)
Another good idea is to always try another power supply, just to see if it has an effect.
This is more relevant with 5V supplies than with higher voltage ones, probably because of the lower margins to Vmin of the input regulator.


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Fri Jul 19, 2019 6:11 pm 



Joined: 12 Jun 2017
Posts: 122
Rama, about that wifi AP behavior, I also get that, GBS page is very slow to respond or doesn't at all. And very hard to connect while console is on.
Also I can't launch the connect to wifi page so I can't test how it behaves on a network.
Oh there an update, gonna test it ignore above for now.

Ok so, in AP mode, there are still a lot of problems while a console is on. The web page get unresponsive, and it also affects GBS behavior, like a preset change can take tens of seconds and can even make the monitor go in standby due to lack of signal.

When connected to home wifi, everything is smooth and responds immediately.

This is with the latest commit

On a side note, I tested this with 3 SFC and 2 cables (1 with composite as sync, 1 with luma as sync), and the behavior is the same whatever the combination is (so it's not NTSC subcarrier doing some things)


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Fri Jul 19, 2019 10:09 pm 



Joined: 08 Mar 2017
Posts: 851
The EMI that causes this comes from the scaler SOC.
Whether it affects WiFi or not depends on the H-PLL locking onto the source at a specific frequency.
If that frequency happens to be in an unfortunate range, the SOC produces EMI that drowns out the weak WiFi antenna of the ESP8266 module.

The ESP8266 WiFi will then loose contact until:
- the H-PLL changes frequency (console switches video mode, console switches off)
- the WiFi channel is changed (avoiding the problematic EMI peak)
- the ESP8266 module / antenna is moved further away from the EMI source
- some other factor magically fixes it, usually only for a short while (WiFi is weird)

I'm trying out some ideas. Currently attempting to force a recalibration after a preset has loaded.
I know about the blocking by the way, but I'd rather try to fix WiFi in general than hack around it.


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Fri Jul 19, 2019 10:38 pm 



Joined: 12 Jun 2017
Posts: 122
Also, is mDNS broken, I can't find gbscontrol.local anymore when connected to network.


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 Post subject: Re: GBS 8200/8220 CFW Project
PostPosted: Sat Jul 20, 2019 12:58 am 



Joined: 08 Mar 2017
Posts: 851
It's not, it works just fine here.
You need to make sure to work with a connected ESP8266.

Update:
Okay, I think I've tried every trick in the Espressif API reference. Nothing even hints at an improvement :/
So software fixes appear to be useless. It needs to be fixed in hardware.


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