Stuff error( Bit timing parameters)
"chinna_indra2000" <[email protected]> Sun, 06 Jan 2008 17:47:36 -0000
| Newsgroups | gmane.comp.hardware.motorola.microcontrollers |
|---|---|
| Message-ID | <[email protected]> |
--f7soT6wZy5UZXuQBrtpU1ZXvHWdi9AQcovuwxkC Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi I have used the following bit-timing settings on each board Bit rate =3D 1 Mbps sync_seg =3D 1 prop_seg =3D 4 phase_seg1 =3D 5 phase_seg2 =3D 3 RJW =3D 1 system clock frequencey =3D 56MHz Baud rate=3D 83330 please let me know is this bit timing setting results in stuff error and reply me with some configuration. Regards, Indrasena RE: [MPC500] Stuff error=20 Stuff errors are hardware or timing related and there are no restrictions on the content of the data frame - after 5 consecutive=20 bits of ID, data or CRC, the Toucan will automatically stuff a bit. THe=20 only s/w error is setting the bit timing. Here are a few things to try: - ensure you have the 120ohm termination resistors at each end of the bus i.e. two 120 ohm resistors across CAN_H and CAN_L. THis is essential. - check or adjust your bit-timing settings and use the same settings=20 on each device. THere's more to it than just having the numbers add up=20 to the correct timing. Set RJW to max and make sure the prop delay is reasonable. Look at the waveform on a scope to check the timing. With the termination resistors, the waveform should look relatively=20 square. - if it still doesn't work, try dropping the baud rate to see if you=20 get any success. 1Mbaud is the max, but try reducing it just to see if=20 you get any better success. If you have your bit-timings correct, 1M=20 should be possible without errors. - Allan ________________________________ From: [email protected] [mailto:[email protected]] On=20 Behalf Of chinna_indra2000 Sent: Saturday, December 29, 2007 10:34 PM To: [email protected] Subject: [MPC500] Stuff error I get stuff error while transmitting messages over TouCAN. Following is the test setup I have used for the CAN message transmission Two MPC 565 boards connected by CAN cables (TouCAN A and TouCAN B on one board connected to TouCAN A and TouCAN B respectively on another board). I have used Extended ID 0xEEEEEEEE for transmitting the Data Frame from the first 565 board to second one. When I send a message from First MPC565 board to the second one I get a stuff error on second one. Can a stuff error can occur due to problem in the software or does it occur only due to hardware problem? Is there any restriction on the content of the Data Frame ie., I read in one of the CAN documents that there should not be 7 consecutive recessive bits in CAN frame. Please let me know. Regards, Indrasena --f7soT6wZy5UZXuQBrtpU1ZXvHWdi9AQcovuwxkC Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> </head> <body style="background-color: #ffffff;"> <!--~-|**|PrettyHtmlStartT|**|-~--> <div id="ygrp-mlmsg" style="width:655px; position:relative;"> <div id="ygrp-msg" style="width: 490px; padding: 0 15px 0 0; float:left; z-index:1;"> <!--~-|**|PrettyHtmlEndT|**|-~--> <div id="ygrp-text"> <p>Hi<br> <br> I have used the following bit-timing settings on each board<br> <br> Bit rate = 1 Mbps<br> sync_seg = 1<br> prop_seg = 4<br> phase_seg1 = 5<br> phase_seg2 = 3<br> RJW = 1<br> system clock frequencey = 56MHz<br> Baud rate= 83330<br> <br> please let me know is this bit timing setting results in stuff error<br> and reply me with some configuration.<br> <br> Regards,<br> Indrasena<br> <br> RE: [MPC500] Stuff error <br> <br> Stuff errors are hardware or timing related and there are no<br> restrictions on the content of the data frame - after 5 consecutive <br> bits<br> of ID, data or CRC, the Toucan will automatically stuff a bit. THe <br> only<br> s/w error is setting the bit timing.<br> <br> Here are a few things to try:<br> - ensure you have the 120ohm termination resistors at each end of the<br> bus i.e. two 120 ohm resistors across CAN_H and CAN_L. THis is<br> essential.<br> - check or adjust your bit-timing settings and use the same settings <br> on<br> each device. THere's more to it than just having the numbers add up <br> to<br> the correct timing. Set RJW to max and make sure the prop delay is<br> reasonable. Look at the waveform on a scope to check the timing. With<br> the termination resistors, the waveform should look relatively <br> square.<br> - if it still doesn't work, try dropping the baud rate to see if you <br> get<br> any success. 1Mbaud is the max, but try reducing it just to see if <br> you<br> get any better success. If you have your bit-timings correct, 1M <br> should<br> be possible without errors.<br> <br> - Allan<br> <br> ____________<wbr>_________<wbr>_________<wbr>__<br> <br> From: <a href="mailto:MPC500%40yahoogroups.com">MPC500@yahoogroups.<wbr>com</a> [mailto:<a href="mailto:MPC500%40yahoogroups.com">MPC500@yahoogroups.<wbr>com</a>] On <br> Behalf<br> Of chinna_indra2000<br> Sent: Saturday, December 29, 2007 10:34 PM<br> To: <a href="mailto:MPC500%40yahoogroups.com">MPC500@yahoogroups.<wbr>com</a><br> Subject: [MPC500] Stuff error<br> <br> I get stuff error while transmitting messages over TouCAN.<br> <br> Following is the test setup I have used for the CAN message<br> transmission Two MPC 565 boards connected by CAN cables (TouCAN A<br> and TouCAN B on one board connected to TouCAN A and TouCAN B<br> respectively on another board).<br> <br> I have used Extended ID 0xEEEEEEEE for transmitting the Data Frame<br> from the first 565 board to second one.<br> <br> When I send a message from First MPC565 board to the second one I<br> get a stuff error on second one.<br> <br> Can a stuff error can occur due to problem in the software or does<br> it occur only due to hardware problem?<br> <br> Is there any restriction on the content of the Data Frame ie., I<br> read in one of the CAN documents that there should not be 7<br> consecutive recessive bits in CAN frame.<br> <br> Please let me know.<br> <br> Regards,<br> Indrasena<br> <br> </p> </div> <!--~-|**|PrettyHtmlStart|**|-~--> <span width="1" style="color: white;">__._,_.___</span> <!-- Start the section with Message In topic --> <div id="ygrp-actbar"> <span class="left"> <a href="http://groups.yahoo.com/group/MPC500/message/3926;_ylc=X3oDMTM0cTIyNnM3BF9TAzk3MzU5NzE0BGdycElkAzYyNzYzODcEZ3Jwc3BJZAMxNzA2NTU0MjA1BG1zZ0lkAzM5MjYEc2VjA2Z0cgRzbGsDdnRwYwRzdGltZQMxMTk5NjQxNjU5BHRwY0lkAzM5MjY-"> Messages in this topic </a> (<span class="bld">1</span>) </span> <a href="http://groups.yahoo.com/group/MPC500/post;_ylc=X3oDMTJwZjFvOXYzBF9TAzk3MzU5NzE0BGdycElkAzYyNzYzODcEZ3Jwc3BJZAMxNzA2NTU0MjA1BG1zZ0lkAzM5MjYEc2VjA2Z0cgRzbGsDcnBseQRzdGltZQMxMTk5NjQxNjU5?act=reply&messageNum=3926"> <span class="bld"> Reply </span> (via web post) </a> | <a href="http://groups.yahoo.com/group/MPC500/post;_ylc=X3oDMTJlYm85bmNtBF9TAzk3MzU5NzE0BGdycElkAzYyNzYzODcEZ3Jwc3BJZAMxNzA2NTU0MjA1BHNlYwNmdHIEc2xrA250cGMEc3RpbWUDMTE5OTY0MTY1OQ--" class="bld"> Start a new topic </a> </div> <!------- Start Nav Bar ------> <!-- |**|begin egp html banner|**| --> <div id="ygrp-vitnav"> <a href="http://groups.yahoo.com/group/MPC500/messages;_ylc=X3oDMTJlYnN0NW1wBF9TAzk3MzU5NzE0BGdycElkAzYyNzYzODcEZ3Jwc3BJZAMxNzA2NTU0MjA1BHNlYwNmdHIEc2xrA21zZ3MEc3RpbWUDMTE5OTY0MTY1OQ--">Messages</a> | <a href="http://groups.yahoo.com/group/MPC500/links;_ylc=X3oDMTJmZmFtMGd1BF9TAzk3MzU5NzE0BGdycElkAzYyNzYzODcEZ3Jwc3BJZAMxNzA2NTU0MjA1BHNlYwNmdHIEc2xrA2xpbmtzBHN0aW1lAzExOTk2NDE2NTk-">Links</a> </div> <!-- |**|end egp html banner|**| --> <div id="ygrp-grft"> </div> <div id="ygrp-mkp"> <div id="hd">MARKETPLACE</div> <div id="ads"> <div class="ad"> <hr size=1 noshade><a href="http://us.ard.yahoo.com/SIG=12m9gh5d7/M=571476.12066680.12490312.11509771/D=groups/S=1706554205:MKP1/Y=YAHOO/EXP=1199648859/A=5086951/R=0/SIG=12k8pu1n3/*http://college-finder.net/index.cfm?key=yahoo_colfngrouptxt_12066680&c=CA152932587">Earn your degree in as few as 2 years - Advance your career with an AS, BS, MS degree</a> - College-Finder.net. </div> </div> </div> <!-- yahoo logo --> <!-- |**|begin egp html banner|**| --> <div id="ygrp-ft"> <a href="http://groups.yahoo.com/;_ylc=X3oDMTJkaWZwb3VuBF9TAzk3MzU5NzE0BGdycElkAzYyNzYzODcEZ3Jwc3BJZAMxNzA2NTU0MjA1BHNlYwNmdHIEc2xrA2dmcARzdGltZQMxMTk5NjQxNjU5"> <img src="http://us.i1.yimg.com/us.yimg.com/i/yg/img/logo/ma_grp_160.gif" height="15" width="106" border="0" alt="Yahoo! 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