Author Topic: VGA from Cubieboard  (Read 47502 times)

Offline elpeibel

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Re: VGA from Cubieboard
« Reply #30 on: September 27, 2013, 07:16:17 am »
ok. I'm working trought VGA


i had no really edit script.bin... so thanks and sorry

ipetrovic11

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Re: VGA from Cubieboard
« Reply #31 on: October 09, 2013, 04:44:13 am »
I am confused now.

Which is right solution? Only 3 resistors or with (74AHCT04)?

What does 74AHCT04 is for anyway? does it just make signal stronger or does it change anything?

ipetrovic11

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Re: VGA from Cubieboard
« Reply #32 on: October 10, 2013, 02:13:25 pm »
Ok here is update:

I made it only with 3 resistors connected to the ground and it is working.
I also used 27 and 30 pins for Sync.

It is working ok, I still have to check different resolutions and few things but it is ok for now.

Thx safari and ircan for help

Offline JuSchu

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Re: VGA from Cubieboard
« Reply #33 on: November 16, 2013, 05:31:17 pm »
I've got a few questions about the circuit from lawrence.
I'm from Germany and it looks like I can't buy the SN74AHCT04 here.
But I found the SN74HCT04 in a german shop:
http://www.produktinfo.conrad.com/datenblaetter/150000-174999/150134-da-01-en-CMOS_IC_SN74HCT04N__DIP14__TID.pdf
Can I use this IC instead? According to the datasheet the pins are the same.

But after I saw the datasheet I also wonder why we need this IC.
It's basicly a bunch of not gates. And for hsync and for vsync the circuit is using two not gates in a row. But two not gates in a row doesn't change anything.
Am I missing something?
Well, I'm more a programmer than an electrical engineer. So I think I'm missing something.

And which numbers are for the resistance value? I don't see any numbers with an Omega or "Ohm".
Is it 75Ohm for the pulldowns on the r, g and b lines and 175Ohm for the VCC pin on the IC?

Offline diogoc

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Re: VGA from Cubieboard
« Reply #34 on: November 18, 2013, 04:35:23 am »
No, you can't use the 74HCT version because it is slower.
In the new versions of cubieboard you can connect directly the vsync and hsync pins, without the IC.

You only need 3 resistors of 75 ohm between the R, G and B signals to GND.

Offline JuSchu

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Re: VGA from Cubieboard
« Reply #35 on: November 19, 2013, 10:12:50 am »
In the new versions of cubieboard
Do you mean Cubieboard 2 and Cubietruck or do you also mean newer Cubieboards from the first version?

Offline diogoc

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Re: VGA from Cubieboard
« Reply #36 on: November 20, 2013, 03:47:27 am »
It should work too on Cubieboard A10 version 09/09

jujiaqi

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Re: VGA from Cubieboard
« Reply #37 on: February 11, 2014, 11:29:34 pm »
HI
my good test VGA & CVBS  (Androide And Linaro)


HDMI PIC (LINARO)

Could you tell me  where  I can  download the android source which you use in pictures aboue, thank you very much!

Offline ahrovan

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Re: VGA from Cubieboard
« Reply #38 on: February 12, 2014, 02:12:51 am »

Offline patwood

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Re: VGA from Cubieboard
« Reply #39 on: February 12, 2014, 10:37:20 am »
That's very nice. BTW, when you play videos, do you get them on both LCD and VGA, or just one?