Is it possible to implement S-Video or VGA output on the DSO

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betoknigth
Posts: 1
Joined: Wed May 31, 2017 2:07 pm

Is it possible to implement S-Video or VGA output on the DSO

Post by betoknigth »

Good morning people.

I think everyone suffers from using the DSO150 with the small 2.4" screen.

It would be very interesting if there was an alternative video output, in AV-signal (CVBS - composite video), S-video or VGA, so we could connect the old TV or LCD / LED monitors, or even small 7" car monitors.

http://www.aliexpress.com/item/Hot-7-In ... 9.6.ZcXFzP

Are GPIO ports available in the uC to implement?

Would it be more interesting to have a second UC, receiving the information, which goes to the 2.4 "display, and convert to S-video and VGA to avoid loss of performance of the DSO150?

Does anyone else get annoyed that the power input is under the cabinet?

AV-signal (CVBS - composite video)
Image

S-video
Image

VGA - monitor
Image

VGA on arduino:
http://labdegaragem.com/profiles/blogs/ ... o-completo

It would be very interesting to have an oscilloscope without screen, would facilitate the assembly and could use any screen.

Does anyone know which part of the code is responsible for sending the data to the 2.4" screen so that we can change the data?

Thank you all.
qu1ck
Posts: 24
Joined: Tue Nov 29, 2016 4:43 am

Re: Is it possible to implement S-Video or VGA output on the

Post by qu1ck »

Does anyone know which part of the code is responsible for sending the data to the 2.4" screen so that we can change the data?
Currently this is done in libdso (not open source) which is described here https://github.com/JYEtech/DSO-Shell-op ... ibrary.pdf

The lib however does provide access to the capture buffer and we can potentially send it over to another micro over USART which will then generate a nice VGA signal. I don't think the stm32 on the scope itself can handle it without significant performance hit, but if we pipe the info into, say, esp8266 we should be able to bitbang a decent VGA output.
If even Arduino can do 640x480 with a bit of silicon (https://dqydj.com/how-to-produce-640x48 ... n-arduino/) espressif 80mhz wonderchip can probably do better, although I couldn't find any examples of it off hand.
Zmail
Posts: 10
Joined: Fri Mar 24, 2017 10:58 am

Re: Is it possible to implement S-Video or VGA output on the

Post by Zmail »

Should be not a big problem to generate the video signal directly by SW.

Apple II or Sinclair Spectrum did it by HW - but far slower and simpler.
(enjoy the ingenious work of Steve Wozniak and Sir Clive Sinclair by
studying the old schematics ;)

On the other side, the internal TV resolution has been only about
800 x 600 (4:3 form and 625 lines in Europe => ~767 x 575 because the
vertical synchronization impulse "eat" 50 lines)

Today however is it maybe easier (and cheaper) to buy the whole CNN
studios as a one tiny IC in - let say - 5mm lithography for about 10 cents ...
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