New: 640x240 VGA graphics driver

Bill Henning

Hi guys,

I took a bit of a break from fighting with an ARM system, and I modified the 512x384 graphics driver so that it will work with my 640x480 limited small VGA monitor [noparse]:)[/noparse]

I've uploaded it to the Propeller Object Exchange, but until it gets approved, you can download it from my site (link below).

Enjoy,

Bill

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DogP

Is that 640x480 full height interlaced, or is it actually 640x240 (sorta widescreen). Hopefully I'll have my chip tomorrow or Tuesday and I'll get to try some of these drivers out [noparse]:)[/noparse] .

DogP

Bill Henning

Full height, not interlaced.

As far as a monitor is concerned, it is 640x480 standard VGA

As the propeller does not have enough memory for a full 640x480 bitmap, every line is shown twice, resulting in a 640x240 display

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DogP

Oh... yeah, I was thinking interlaced because of lack of memory... but yeah, duplicated lines works too [noparse]:)[/noparse] .

Pat

Bill Henning

I just made a better plot pixel routine for it

[noparse][[/noparse]code]
PUB plot(x,y,v)
· if x => 0 and x < 640 and y => 0 and y < 240
··· if v
····· pixels[noparse][[/noparse]y * 20 + x >> 5] |= |< x
··· else
····· pixels[noparse][[/noparse]y * 20 + x >> 5] &= ! |< x


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