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CAN Bus 11 bit addressing

 
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CAN Bus 11 bit addressing
PostPosted: Wed Dec 09, 2009 7:08 pm     Reply with quote
I am using a PIC18F4580 to read CAN packets from a motec M400 ECU.

I don't have the code with me at the moment, but I seem to be having trouble reading any address from the ECU that is below 2048. So looks like I can only read 29 bit addressing. I know you can store an 11 bit value in a 29 bit space. But is there a way to specify that you only want to read an 11 bit address, just like you can specify if an address is basic or extended when using
Code:
can_putd(int32 id, int * data, int len,int priority, int1 ext, int1 rtr);

where int1 ext defines 11 or 29 bit.

Many thanks

Juan
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Dec 10, 2009 1:41 pm     Reply with quote
The default setting is to use 29-bit ID's. Look in the .H file for the CCS
CAN driver that you're using. You'll see this:
Code:
#IFNDEF CAN_USE_EXTENDED_ID
  #define CAN_USE_EXTENDED_ID         TRUE
#ENDIF
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