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'[OT:] NKK Smartswitch code for the AVR'
2004\08\17@153645 by Dave VanHorn

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www.nkksmartswitch.com/
http://www.dvanhorn.org/AvrSoftware/

They aren't cheap, but they sure are nice!

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2004\08\17@214915 by Dave VanHorn

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Ok, here's a couple of questions:

I've implemented the ability to blow an image out of rom, onto the display.
That can easily be turned into multiple images..

But, I'd like to do ASCII text, not just pictures.

The thing is, a full page of ram for the display, means 120 bytes, which is nearly all the ram in a Tiny-26.

The display has to be continuously refreshed, a line per mS more or less, with the existing routine taking about 70uS to load a line.

So, what mechanisms could I use, to allow text data to be pulled from ROM, given that I might have two or three lines of text?

I also need a sane way to generate/manipulate tiny bitmapped fonts.

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2004\08\18@031430 by Ake Hedman

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Dave,

what do tey charge for the switches?

/Ake


Dave VanHorn wrote:

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2004\08\18@104005 by Dave VanHorn

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At 02:13 AM 8/18/2004, Ake Hedman wrote:

>Dave,
>
>what do tey charge for the switches?

I've seen prices like $20-$50 in singles, but it comes down in quantity.
Not widely sourced, and of course since they don't sell a lot, they are expensive so they don't sell a lot.

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2004\08\18@132459 by Howard Winter

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Dave,

On Wed, 18 Aug 2004 09:40:48 -0500, Dave VanHorn wrote:

> At 02:13 AM 8/18/2004, Ake Hedman wrote:
>
> >Dave,
> >
> >what do tey charge for the switches?
>
> I've seen prices like $20-$50 in singles, but it comes
down in quantity.
> Not widely sourced, and of course since they don't
sell a lot, they are expensive so they don't sell a lot.

But Dal Wheeler was advertising them here a couple of
weeks ago - I'm buying some from him for less than $100
for ten (total, shipped to the UK)!

Cheers,


Howard Winter
St.Albans, England

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2004\08\18@134202 by Dave VanHorn

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>
>But Dal Wheeler was advertising them here a couple of
>weeks ago - I'm buying some from him for less than $100
>for ten (total, shipped to the UK)!

That's the very ones.
I have a box of them in hand.

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2004\08\18@134824 by Dal Wheeler

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And I still have a quite a few left.  For everyone who ordered some from me
so far, everything has shipped out.
BTW, I have paypal working now.
-Dal

{Original Message removed}

2004\08\18@193317 by Dave VanHorn

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At 02:38 PM 8/17/2004, Dave VanHorn wrote:

>http://www.nkksmartswitch.com/
>http://www.dvanhorn.org/AvrSoftware/

Updated, simple text output now supported, ASCII to pixel translation on the fly.
Needs more font data, I only implemented ABCDEFGH, but the engine is there..

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2004\08\19@124925 by Peter L. Peres

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>But, I'd like to do ASCII text, not just pictures.

>The thing is, a full page of ram for the display, means 120 bytes, which
>is nearly all the ram in a Tiny-26.

>The display has to be continuously refreshed, a line per mS more or less,
>with the existing routine taking about 70uS to load a line.

You can easily use longer times for calculation (200us would be 20% load
if refresh is at 1 msec/line).

So you could use a normal character table and look up character bits by
scan line. You did that printer project, surely you can remember how it's
done.

Peter

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2004\08\20@101247 by Dave VanHorn

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>
>So you could use a normal character table and look up character bits by
>scan line. You did that printer project, surely you can remember how it's
>done.

I did. I just hadn't done it yet.

The current version has a short font table "A-Z" implemented, and does roll and pan as well.
I implemented it as an 8 x 12 font, and two rows of four chars, to keep it simple.
8 bytes of ram to store the ascii, and every mS we go see what display row we are refreshing, then pull up the appropriate line of the font data for the appropriate char group, and blow that into the 5 byte display buffer. Then we do the left-right panning by using a barrel shifter, and I did the roll by altering which line the FLM is asserted on.

So, the code that's up there now shows how bitmapped fonts work, at least in the simplest case, and could certainly be hijacked into a printer design.

The code that we use for printers is a lot more complex, as is the font data.. :-P Not needed or wanted for this simple app.

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