Good suggestions, will look into implementing CRC16 with hardware and the whitening for small payload.
Processor - Atmel AT90S8535 - face turns beat red. =) Looking at the packet.sink code, it looks like it's independant of the CRC code. Is this right? It does need the whitening for the reason you mentioned. gmsk2_pkt.py uses delete_head(). I can't find this code, where is it? The way it's called, it almost looks its part of some standard package. Is it? Mike Original Message: ----------------- From: Eric Blossom [EMAIL PROTECTED] Date: Thu, 1 Dec 2005 14:08:45 -0800 To: [EMAIL PROTECTED], discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] (no subject) On Thu, Dec 01, 2005 at 01:53:15PM -0500, [EMAIL PROTECTED] wrote: > On Wed, 30 Nov 2005 15:00:34 -0800, Eric Blossom wrote: > > The calling sequence for the gaussian filter design changed. > > Even if ggmsk-test were fixed to use it, it doesn't work anywhere > > nearly as good as the new code. > > I would like to use the new code in gmsk2 but I can't implement the CRC32 > and the whiten/dewhiten in the microprocessor used in the transmitter. The > original engineer on this project, who left the company and that I am > replacing, selected a real poor microprocessor. Then use CRC16. It only requires a constant 256 byte table. The table required for whitening only needs to be as long as your longest message. Shouldn't be a problem, even on a 8051. What processor *did* he choose? ;) > Do you think that I can use the same basic idea of the gmsk2 framer and > sync whithout the use of the CRC32 and whiten? Without whitening you may get no transitions in the data (e.g., all zeros or all ones). This results in a single tone which has zero information for recovering the clock. Whitening is cheap. I assume you've got some flash to store code and/or data. Eric -------------------------------------------------------------------- mail2web - Check your email from the web at http://mail2web.com/ . _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
