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'[PIC]: Barcode decoding was Re: [PIC]: Timer 0'
2001\01\04@042526 by Alan B. Pearce

face picon face
>I have no fear of ints.
>My first uC job was decoding barcodes literally while they were coming in
>under the pen.
>Total interrupt job, in fact the int code had to reconfigure the ints to
>get the opposing edges.  I learned a lot, and fast, on that system!

>The best part is decoding a digit in UPC/EAN, from four timings, in five
>comparisons.
>From that, I get direction, parity, and digit.

The best source of info I have for doing this is the original Motorola 6800
Assembly Language Manual (I forget its exact name) which has a section on
barcodes and the theory of scanning a UPC with a wand. As you work through the
book they build a complete POS terminal with example machine code for printer,
keyboard, display and barcode. Its one of those "dont you dare throw it out"
books.

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2001\01\04@092128 by David VanHorn

flavicon
face
>
>The best source of info I have for doing this is the original Motorola 6800
>Assembly Language Manual (I forget its exact name) which has a section on
>barcodes and the theory of scanning a UPC with a wand. As you work through the
>book they build a complete POS terminal with example machine code for printer,
>keyboard, display and barcode. Its one of those "dont you dare throw it out"
>books.

I would VERY much like to have a copy of that, having designed POS
terminals for a good number of years.


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2001\01\04@105415 by Alan B. Pearce

face picon face
>I would VERY much like to have a copy of that, having designed POS
>terminals for a good number of years.

I could organise a copy of the barcode bit if you want. The whole book is a bit
much to copy - it is about 1-1.5 inches thick. It will take me a bit to think
which box it is in and dig it out if you want it.

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2001\01\04@105830 by David VanHorn

flavicon
face
At 03:53 PM 1/4/01 +0000, Alan B. Pearce wrote:
> >I would VERY much like to have a copy of that, having designed POS
> >terminals for a good number of years.
>
>I could organise a copy of the barcode bit if you want. The whole book is
>a bit
>much to copy - it is about 1-1.5 inches thick. It will take me a bit to think
>which box it is in and dig it out if you want it.

Thanks, but I just meant that I'd like to get the book if I ever run across
a copy.
I suspect that I may have seen that system implemented in a real product.


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