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Re: [Discuss-gnuradio] gmsk2 - CRC and whitening

From: Robert Cicconetti
Subject: Re: [Discuss-gnuradio] gmsk2 - CRC and whitening
Date: Fri, 2 Dec 2005 08:34:06 -0500

Apologies. That is definitely the wrong version. That one just sends out MARK continuously. Try this one.


On 12/2/05, Robert Cicconetti <address@hidden> wrote:
I've got some half working code for an APRS tracker targeting an -8515. Doesn't have a crc routine built in (didn't get that far). Maybe one of these days I'll finish it. :) At some point I did have multimon decoding my test packet, but I can't guarantee that this is the version that actually worked. :)

As I recall, it's set to use a 3.6864 Mhz oscillator and to generate 1200/2200 baud signals. It implements a basic HDLC NRZI encoding, and a software DDS. Data comes out PORTC. Running a 10 khz sample clock, the beast was asleep most of the time, waiting for a counter to fire.

You're welcome to borrow anything you want from it, although I won't guarantee anything actually works on it.. haven't touched this code in ages. Rather crufty, although it is heavily commented. :) It will currently send out packets containing "TestingTesting" and my call sign. Remember that if you change the packet, you need to change the CRC16 at the end.


On 12/1/05, Daniel O'Connor <address@hidden > wrote:
On Fri, 2 Dec 2005 09:27, Eric Blossom wrote:
> > Processor - Atmel AT90S8535 - face turns beat red. =)
> The AVR processors are very nice.  Sort of a minature RISC architecture.
> You've got 8K of flash, so I don't see any problem at all.  I think
> there's a port of GCC that targets it too.

There sure is :)

The 8535 is pretty crusty though ;)

Attachment: fsk2.c
Description: Binary data

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