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| Search found 4 matches |
| Author | Message |
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 Topic: 18F258 Can bus issue |
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| Lengrammer Replies: 8 Views: 14020 |
 Forum: General CCS C Discussion Posted: Wed Nov 16, 2011 10:26 am Subject: 18F258 Can bus issue |
| I plugged an MCP2551 into a socket on my PicDem2-Plus board.
(I already had a socket added for this purpose). I measured +5v on the Vdd pin and +2.5v on the Vref pin. I have a question. Do you ... |
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| Topic: 18F258 Can bus issue |
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| Lengrammer Replies: 8 Views: 14020 |
Forum: General CCS C Discussion Posted: Tue Nov 15, 2011 4:24 pm Subject: 18F258 Can bus issue |
| I didn't mean that. I assumed you removed the MCP2551 from your
circuit. Then you looked at the CANTX pin on the PIC. Then you saw no signal. The reason for that is the CANTX pin requires a p ... |
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| Topic: 18F258 Can bus issue |
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| Lengrammer Replies: 8 Views: 14020 |
Forum: General CCS C Discussion Posted: Tue Nov 15, 2011 3:41 pm Subject: 18F258 Can bus issue |
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That is actually the expected behavior. The CCS CAN Bus drivers configure the CANTX pin so it doesn't "drive high". It requires an external pull-up resistor on that pin. The MCP2 ... |
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| Topic: 18F258 Can bus issue |
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| Lengrammer Replies: 8 Views: 14020 |
Forum: General CCS C Discussion Posted: Tue Nov 15, 2011 12:20 pm Subject: 18F258 Can bus issue |
| Hey,
I'm having a Can bus issue right now which is quite strange. I've created a little board that listens to the CAN bus, it's for switching some lights on and off. The software I created works ... |
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