[aprssig] Need some advice : Generating packet on a PIC

[James Washer]

That's about it... Not that hard.  What language will you be developing in? Assember, or something higher level.

 - jim

On Thu, 13 Jan 2005 19:48:04 +1000
"Andrew Rich" <vk4tec at tech-software.net> wrote:

> Howdy,
> 
> I have just completed some PIC code that uses a R ladder to create RTTY
> tones.
> 
> This works a treat with 100% copy even over a noisy, radio link.
> 
> Problem. Not much uses RTTY except some stand alone programs, nothing really
> "APRS"
> 
> I have therefore made the decision to go for ax25 packet.
> 
> What should I arm myself with as far as documentation ?
> 
> 1. Scott N1VG's notes on ax25
> 2. dcc.doc by w2fs "Genarting ax25 ui frames with Pic microcontrollers"
> 
> I see the greatest challenge will be the FCS
> 
> I understand that apart from the flag, you have to bit stuff after 5
> consecutives bits.
> 
> Any help appreciated.
> 
> I have acheived so much with PICS, and if I can interface with my TNC I
> would be most happy
> 
> Cheers Andy VK4TEC
> 
> www.tech-software.net
> 
> 
> 
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