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Frank N. Furter
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Joined: 28/05/2012
Location: Germany
Posts: 979

Posted: 09:28am 27 Feb 2018

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I have a question for our display specialists. I would like to connect a THG057VGLAC-H000 with RGB-TTL to a CMM or our ASCII VT100. How could I generate the pixel clock? Do you think this will work? I have some doubts about the timing - otherwise it would have to work just to put all R, G and B bits together at the respective outputs?
... or does anyone of you know a chip (or board) that converts analog VGA to TTL-VGA?
THANKS!!!

Frank

MicroBlocks

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Joined: 12/05/2012
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Posted: 10:04am 27 Feb 2018

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http://geoffg.net/tft-maximite.html
https://github.com/heise/MAXIMITE

Google "Maximite TFT" for more results.

Microblocks. Build with logic.

Frank N. Furter
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Location: Germany
Posts: 979

Posted: 10:54am 27 Feb 2018

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Hi MicroBlocks,

thanks for your response - I know the TFT Maximite from MAKE. But this works only with a modified firmware! I'd rather put it in hardware and install a non-modified ASCII VT100 or MMC...

Frank

MicroBlocks

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Posted: 11:38am 27 Feb 2018

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It is strange that they call it a 'VGA' when there is no VGA connection available.
What you could do is just connect the RGB outputs from the CMM to the screen as is shown in the schematic of the TFT version of the CMM (each color to the 8 corresponding pins on the display). If the timing is the same as a VGA then it should work.
If not, then you have to modify a lot more.

Microblocks. Build with logic.

matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10569

Posted: 12:01pm 27 Feb 2018

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Quote How could I generate the pixel clock?

The pixel clock can be taken from the SPI CLK output of the PIC. The issue I can't comment on is how this works with the CMM which doesn't put out 640 pixels across the screen. On the MMX it would work although you may have to gate the clock with the line and frame blanking to avoid clock pulses when you don't want them

Frank N. Furter
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Joined: 28/05/2012
Location: Germany
Posts: 979

Posted: 08:13am 28 Feb 2018

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Thanks for your advice - I'll give it a try.

Frank

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