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New driver for specific device #25

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thedrip opened this issue May 31, 2020 · 3 comments
Open

New driver for specific device #25

thedrip opened this issue May 31, 2020 · 3 comments

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@thedrip
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thedrip commented May 31, 2020

Thank you for such a great little video driver!

It's working great, but I was wondering if I could request a specific resolution.

800x480 @ 60
100X60 character and/or 50X30 character

This is for a rc2014 vt100 being used with with a 7" 800x480 ebay special Pi monitor.

Thank you!

Edited character counts because I can't do math

@konimaru
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konimaru commented Jun 2, 2020

OK, just hunting down the timing info. If you have any input regarding this please drop a note.

@thedrip
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thedrip commented Jun 2, 2020

This is what I found when trying to rewrite the code myself.

Horizontal: front porch=40, sync width=48, back porch=40, display=800
Vertical: front porch=13, sync width=3, back porch=29, display=480
Dot clock: 40 MHz

@thedrip
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thedrip commented Jun 3, 2020

I found another project, using the timing below

Horizontal geometry:
Scan rate: 31.5 kHz
Active: 800 pixels
Front porch: 64 pixels
Sync width: 80 pixels
Back porch: 56 pixels
Total: 1000 pixels |
Vertical geometry:
Refresh rate: 60Hz
Active: 480 lines
Front porch: 28 lines
Sync width: 3 lines
Back porch: 14 lines
Total: 525 lines
-- | --

I think that works out to a 31.5MHz pixel clock

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