Also see http://www.octavetech.com/pubs/TB5-01%20Deciphering%20TinyOS%20Serial%20 Packets.pdf under general information.
Regards, Damien. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Harri Siirtola Sent: 10 March 2006 08:08 To: [EMAIL PROTECTED]; [email protected] Subject: Re: [Tinyos-help] Getting extra bytes in CRC in TOS_Msg packet Hi Umesh, that's just the ordinary escaping scheme of the 0x7D sync byte. It's done by stuffing a 0x7D into the stream and XORing the actual byte with 0x20 (0x7D xor 0x20 = 0x5D). In your case, the crc happens to have 0x7D on that line. A search on the list will tell you more if you want. Regards, Harri At 01:04 PM 3/10/2006 +0700, S. Umesh Babu wrote: >Hello, > >I am sending some packets from two micaz motes to base station.The data >observed using xlisten program.Some times i am getting crc value 3 >bytes.Actually it should be 2 bytes according to TOS_Msg structure.Can >somebody explain me this. > >something like following.I should get all 15 byte packets.But sometimes >i am getting 16 and larger size packets.I am using >tinyos-1.1.7July2004cvs-2. > >7e42ffff0481060f0000040100cfa2 [15] 7e42ffff0481060e00fe010200db64 [15] >7e42ffff048106100000040100487d5d [16] >7e42ffff0481060f00000202003c45 [15] > >Thankyou >Umesh > > > >_______________________________________________ >Tinyos-help mailing list >[email protected] >https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-he >lp _______________________________________________ Tinyos-help mailing list [email protected] https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-hel p _______________________________________________ Tinyos-help mailing list [email protected] https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
