[aprssig] Tracking and Stacking - NICE PUN!

[Steve Noskowicz]

  Andrew,

    This is called "Packed BCD"...so perhaps "Tracking
 'n Packing".  (:-)
   Among other uses, this is precisely how the Icom
CI-V (computer control) commands represent frequency
data. Icom, however, packs the nibbles into bytes most
significant nibble first (on the left; also called
"big-endian") and then stacks the bytes least
significant byte first (also called "little-endian). 
I call this "mixed-endian".  It is like the difference
between Intel and Morotola address storage methods. 

 You'll get to decide how you do both.

73, Steve, K9DCI


--- Andrew Rich <vk4tec at people.net.au> wrote:

> I made a simple tracker and realised I was sending
> full asii characters.
> 
> I now realise that I can stack more into a packet if
> I use 4 bit stuffing.
> 
> The character "4" and The chracter "7"
> 
> Ascii code for 4 - 0011 0100
> 
> Ascii code for 7 - 0011 0111
> 
> But if you look closely, all you ever want to do is
> go from 0 - 9
> 
> 0000 - 1111 (0 to 15 in binary)
> 
> So you could go from
> 
> 00110100 (4) 00110111 (7) to 0100 (4) 0111 (7) and
> get two digits in one
> byte
> 
> 
> 
> 
> 
> 
> 
> 
> 
>
----------------------------------------------------------------------------
> Andrew Rich VK4TEC
> vk4tec at people.net.au
> http://www.tech-software.net
> 
> 
> 
> Internal Virus Database is out-of-date.
> Checked by AVG Free Edition.
> Version: 7.5.485 / Virus Database: 269.13.16/1004 -
> Release Date: 12/09/2007
> 5:22 PM
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> 



       
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