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cga to vga converter uPython

rlaci
rlaci over 1 year ago

Hi

im new to uPython and needing some help with fast interrupts, port handling, reading into controller, handling the big amount of data and speed

my main aim is to get it working on raspberry pico, as colors 1bit resolution is enought as its an industrial equiment with RGBHV 15.6khz input(output from the machine) need to transfer it to 31khz VGA standard output for an lcd monitor

any help welcome

thanks!

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  • shabaz
    shabaz over 1 year ago +3
    There's a website listing monitors that support your resolution: http://15khz.wikidot.com/ I think it's far more likely that you'll be able to source a monitor if you search long enough on eBay, than…
  • beacon_dave
    beacon_dave over 1 year ago in reply to shabaz +3
    There is a PIO based implementation of a VGA driver discussed here if anyone is interested: https://www.youtube.com/watch?v=ZXMdZGQzrWg
  • michaelkellett
    michaelkellett over 1 year ago in reply to rlaci +3
    It's very, very difficult. You need to delve quite deeply into the data sheets. The things to look for are the IO toggle rate, maximum clock rate of internal RAM, and maybe some benchmarks of complete…
Parents
  • dougw
    0 dougw over 1 year ago

    Are you looking for something like this RGB to VGA adapter? They cost about $1.

    image

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  • beacon_dave
    0 beacon_dave over 1 year ago in reply to dougw

    I think they mean the old IBMPC Color Graphics Array RGBI TTL output

    https://en.wikipedia.org/wiki/Color_Graphics_Adapter#DE-9_connector_for_RGBI_monitor

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  • rlaci
    0 rlaci over 1 year ago in reply to beacon_dave

    RGB + Hsync Vsync. the adapter should contain 5inputs the one youl listed looks like 3 inputs

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  • rlaci
    0 rlaci over 1 year ago in reply to beacon_dave

    sorry the other reply was for the original comment.

    i looked up your link and hsync is pretty similiar, but vsync is 63hz not 59.xxx

    the sync is ttl level

    rgb also ttl level

    mine has no intensity output and rgb signals look like low high

    possibly you are right and my machine was derived from this standard, its a cnc mill sinumerik controlled operators panel

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  • beacon_dave
    0 beacon_dave over 1 year ago in reply to rlaci

    You might be able to pick up an Extron VS 304 for next to nothing. They could handle 15kHz RGBHV and scale to VGA.

    https://www.extron.com/product/dvs304

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  • beacon_dave
    0 beacon_dave over 1 year ago in reply to rlaci

    You might be able to pick up an Extron VS 304 for next to nothing. They could handle 15kHz RGBHV and scale to VGA.

    https://www.extron.com/product/dvs304

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  • rlaci
    0 rlaci over 1 year ago in reply to beacon_dave

    nice hint as i saw on ebay its common in usa but im from europe

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