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

[Andrew Rich]

ASM

-----Original Message-----
From: James Washer [mailto:washer at trlp.com]
Sent: Friday, 14 January 2005 12:20 AM
To: vk4tec at tech-software.net; TAPR APRS Mailing List
Subject: Re: [aprssig] Need some advice : Generating packet on a PIC


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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