RE:
"Jean-Christophe MATHAE" <[email protected]> Wed, 18 Jun 2008 10:09:58 +0200
| Newsgroups | gmane.comp.hardware.motorola.microcontrollers |
|---|---|
| Message-ID | <[email protected]> |
--2oY9CuWm840E47ZlbJoZUM4TQhyYOTvHy5VuOll Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Hello Indrasena Reddy, About the "Time Stamp", it is a copy of the *internal* TouCAN TIMER registe= r captured at the beginning of the identifier field of the frame on the CAN= bus. So it is purely internal to the microcontroller. But its content is somewhat strange (!), as the clock driving this TIMER co= unter is either an internal clock, *or* the CAN bus bit rate which is obvio= usly somewhat different if another CAN bus node is transmitting... I use this time stamp to synchronise the different CAN bus nodes, but to ha= ve a fairly coherent value, a copy the lower 16-bit PowerPC TB (Time Base) = to the TouCAN TIMER register at each TouCAN generated interrupt in each nod= e... Hope this will help. Best regards. Jean-Christophe MATHAE CIRTEM http://www.cirtem.com b=E2timent Pointe Bleue 20, voie l'Occitane BP661 31319 LABEGE cedex France ________________________________ De : [email protected] [mailto:[email protected]] De la part de c= hinna_indra2000 Envoy=E9 : mercredi 18 juin 2008 07:16 =C0 : [email protected] Objet : [MPC500]=20 Hello every , =20 =20 =20 In the message buffer we have one field called "TIME STAMP" Is this field is transferred from source to destination through the CAN? If it is not transferred how the destination will get the same TIME STAMP? I read MPC 565 document they mentioned that, TIME STAMP will be captured before Identifier field while trasmitting a CAN frame through the BUS. but FRAME will consists of SOF,ARBITRATION,CONTROL,DATA,CRC,ACK,EOF fields where does this TIME STAMP get stored in the frame? And one more question what is serial buffer? whether frame gets transferred or serial buffer gets transferred in the CAN BUS?? Thanks and Regards, Indrasena Reddy =20 --2oY9CuWm840E47ZlbJoZUM4TQhyYOTvHy5VuOll Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/htm= l4/strict.dtd"> <html> <head> </head> <body style=3D"background-color: #ffffff;"> <!--~-|**|PrettyHtmlStartT|**|-~--> <div id=3D"ygrp-mlmsg" style=3D"width:655px; position:relative;"> <div id=3D"ygrp-msg" style=3D"width: 470px; margin:0; padding:0 25px 0 0; f= loat:left; z-index:1;"> <!--~-|**|PrettyHtmlEndT|**|-~--> <div id=3D"ygrp-text"> <p>Hello Indrasena Reddy,<br> <br> About the "Time Stamp", it is a copy of the *internal* TouCAN TIM= ER register captured at the beginning of the identifier field of the frame = on the CAN bus.<br> <br> So it is purely internal to the microcontroller.<br> But its content is somewhat strange (!), as the clock driving this TIMER co= unter is either an internal clock, *or* the CAN bus bit rate which is obvio= usly somewhat different if another CAN bus node is transmitting.<wbr>..<br> <br> I use this time stamp to synchronise the different CAN bus nodes, but to ha= ve a fairly coherent value, a copy the lower 16-bit PowerPC TB (Time Base) = to the TouCAN TIMER register at each TouCAN generated interrupt in each nod= e...<br> <br> Hope this will help.<br> <br> Best regards.<br> <br> Jean-Christophe MATHAE<br> <br> CIRTEM<br> <a href=3D"http://www.cirtem.com">http://www.cirtem.<wbr>com</a><br> <br> b=E2timent Pointe Bleue<br> 20, voie l'Occitane<br> BP661<br> 31319 LABEGE cedex<br> France<br> <br> ____________<wbr>_________<wbr>_________<wbr>__<br> <br> De : <a href=3D"mailto:MPC500%40yahoogroups.com">MPC500@yahoogroups.<wbr>co= m</a> [mailto:<a href=3D"mailto:MPC500%40yahoogroups.com">MPC500@yahoogroup= s.<wbr>com</a>] De la part de chinna_indra2000<br> Envoy=E9 : mercredi 18 juin 2008 07:16<br> =C0 : <a href=3D"mailto:MPC500%40yahoogroups.com">MPC500@yahoogroups.<wbr>c= om</a><br> Objet : [MPC500] <br> <br> Hello every ,<br> <br> <br> In the message buffer we have one field called "TIME STAMP" Is th= is<br> field is transferred from source to destination through the CAN?<br> If it is not transferred how the destination will get the same TIME STAMP?<= br> <br> I read MPC 565 document they mentioned that, TIME STAMP will be<br> captured before Identifier field while trasmitting a CAN frame through<br> the BUS. but FRAME will consists of<br> SOF,ARBITRATION,<wbr>CONTROL,DATA,<wbr>CRC,ACK,EOF fields where does this T= IME<br> STAMP get stored in the frame?<br> <br> And one more question<br> what is serial buffer? whether frame gets transferred or serial<br> buffer gets transferred in the CAN BUS??<br> <br> Thanks and Regards,<br> Indrasena Reddy<br> <br> </p> </div>=20=20 <!--~-|**|PrettyHtmlStart|**|-~--> <span width=3D"1" style=3D"color: white;">__._,_.___</span> <!-- Start the section with Message In topic --> <div id=3D"ygrp-actbar"> <span class=3D"left"> <a href=3D"http://groups.yahoo.com/group/MPC500/message/3940;_ylc= =3DX3oDMTM0Y2RrZDJiBF9TAzk3MzU5NzE0BGdycElkAzYyNzYzODcEZ3Jwc3BJZAMxNzA2NTU0= MjA1BG1zZ0lkAzM5NDAEc2VjA2Z0cgRzbGsDdnRwYwRzdGltZQMxMjEzNzc2NjA5BHRwY0lkAzM= 5NDA-"> Messages in this topic </a> (<span class=3D"bld">1</sp= an>) </span> <a href=3D"http://groups.yahoo.com/group/MPC500/post;_ylc=3DX3oDMTJ= wZHZnZ2pjBF9TAzk3MzU5NzE0BGdycElkAzYyNzYzODcEZ3Jwc3BJZAMxNzA2NTU0MjA1BG1zZ0= lkAzM5NDAEc2VjA2Z0cgRzbGsDcnBseQRzdGltZQMxMjEzNzc2NjA5?act=3Dreply&messageN= um=3D3940"> <span class=3D"bld"> Reply </span> (via web post) </a> |=20 <a href=3D"http://groups.yahoo.com/group/MPC500/post;_ylc=3DX3oDMTJ= lbTY0MHUxBF9TAzk3MzU5NzE0BGdycElkAzYyNzYzODcEZ3Jwc3BJZAMxNzA2NTU0MjA1BHNlYw= NmdHIEc2xrA250cGMEc3RpbWUDMTIxMzc3NjYwOQ--" class=3D"bld"> Start a new topic </a> </div>=20 <!------- Start Nav Bar ------> <!-- |**|begin egp html banner|**| --> <div id=3D"ygrp-vitnav"> <a href=3D"http://groups.yahoo.com/group/MPC500/messages;_y= lc=3DX3oDMTJlZzJpdDhoBF9TAzk3MzU5NzE0BGdycElkAzYyNzYzODcEZ3Jwc3BJZAMxNzA2NT= U0MjA1BHNlYwNmdHIEc2xrA21zZ3MEc3RpbWUDMTIxMzc3NjYwOQ--">Messages</a>=20=20 =20=20=20=20=20=20=20=20 =20=20=20=20=20=20=20=20 | <a href=3D"http://groups.yahoo.com/group/MPC500/links;_ylc= =3DX3oDMTJmODNhMWhrBF9TAzk3MzU5NzE0BGdycElkAzYyNzYzODcEZ3Jwc3BJZAMxNzA2NTU0= MjA1BHNlYwNmdHIEc2xrA2xpbmtzBHN0aW1lAzEyMTM3NzY2MDk-">Links</a>=20=20 =20=20=20=20=20=20=20=20 =20=20=20=20=20=20=20=20 =20=20=20=20=20=20=20=20 =20=20=20=20=20=20=20=20 </div>=20=20 <!-- |**|end egp html banner|**| --> <div id=3D"ygrp-grft"> =20=20=20=20=20=20=20=20=20=20 </div> =20=20=20=20=20=20 <div id=3D"ygrp-mkp"> <div id=3D"hd">MARKETPLACE</div> <div id=3D"ads"> <div class=3D"ad"> <hr size=3D1 noshade><a href=3D"http://us.ard.yahoo.com/SIG=3D1= 3r6ir5tf/M=3D624381.12730922.13032918.10835568/D=3Dgroups/S=3D1706554205:MK= P1/Y=3DYAHOO/EXP=3D1213783810/L=3D/B=3DU7DTAdFJq2g-/J=3D1213776610094593/A= =3D5379723/R=3D0/SIG=3D14evd63no/*http://media.adrevolver.com/adrevolver/hr= ef?banner=3D189158&place=3D26143&url_=3Dhttp://tc.deals.yahoo.com/tc/blockb= uster/display.com?cid=3Dbbi00027">Blockbuster</a> is giving away a FREE tri= al of - <a href=3D"http://us.ard.yahoo.com/SIG=3D13r6ir5tf/M=3D624381.12730= 922.13032918.10835568/D=3Dgroups/S=3D1706554205:MKP1/Y=3DYAHOO/EXP=3D121378= 3810/L=3D/B=3DU7DTAdFJq2g-/J=3D1213776610094593/A=3D5379723/R=3D1/SIG=3D14e= vd63no/*http://media.adrevolver.com/adrevolver/href?banner=3D189158&place= =3D26143&url_=3Dhttp://tc.deals.yahoo.com/tc/blockbuster/display.com?cid=3D= bbi00027">Blockbuster Total Access.</a> <!--AdRevolver code begin--> <script type=3D"text/javascript"> <!-- var title =3D 'TITLE'; try { if (title =3D=3D unescape('%u0054%u0049%u0054%u004C%u0045') && document.tit= le) title =3D document.title; var https =3D false; try {https =3D document.location.href.indexOf('https')= =3D=3D0}catch(e){} document.write('<img width=3D"0" height=3D"0" border=3D"0" src=3D"http' + (= https ? 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