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CAN Bit rate

 
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hawke 11
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CAN Bit rate
PostPosted: Thu Mar 29, 2007 6:48 pm     Reply with quote
Hi,
Im trying to set up a CAN node on a 500Khz system. Using a PIC18F4685
@ 20Mhz. Having no success. I think my timing is wrong. I have set up
the bit rate pre-scaler value=0
SJW=2;
phase segment 1=8
phase segment 2 =8
propagation segment =4

any thoughts? I think I got the math right. But no matter what I try I can not get this node to communicate. In loopback mode it works fine.

Thanks
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Mar 29, 2007 7:03 pm     Reply with quote
See my long post in this thread which explains how to do it:
http://www.ccsinfo.com/forum/viewtopic.php?p=41196
It's about 1/3 of the way down in the thread.
rwskinner



Joined: 08 Dec 2006
Posts: 125
Location: Texas

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Re: CAN Bit rate
PostPosted: Mon Apr 02, 2007 1:26 pm     Reply with quote
hawke 11 wrote:
Hi,
Im trying to set up a CAN node on a 500Khz system. Using a PIC18F4685
@ 20Mhz. Having no success. I think my timing is wrong. I have set up
the bit rate pre-scaler value=0
SJW=2;
phase segment 1=8
phase segment 2 =8
propagation segment =4

any thoughts? I think I got the math right. But no matter what I try I can not get this node to communicate. In loopback mode it works fine.

Thanks


Are you subtracting 1 from your desired values?
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