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Canbus mask and filters

 
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ZD



Joined: 24 Sep 2013
Posts: 16

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Canbus mask and filters
PostPosted: Tue Sep 24, 2013 1:25 am     Reply with quote
Dear friends,
I'm using dsPIC30F5011. I confused about the filter and masks and how it works. For example, there are messages with ID's 400, 500 and 600 on the bus. And i want to get messages with ID 400 and 500. I want to set Mask0, Filter0 and Filter1 for getting ID 400 and set Mask1, Filter2, Filter3, Filter4, Filter5 for getting ID 500. I wrote the following code. It only gets messages with ID 400. The messages with ID 500 doesn't pass.
Code:
   CAN_Init();
   can_set_mode(CAN_OP_CONFIG); 

   can_set_id(&C1RXM0,0x1FFFFFFF,TRUE);
   can_set_id(&C1RXF0,0x00000400,TRUE);
   can_set_id(&C1RXF1,0x00000400,TRUE);
     
   can_set_id(&C1RXM1,0x1FFFFFFF,TRUE);
   can_set_id(&C1RXF2,0x00000500,TRUE);
   can_set_id(&C1RXF3,0x00000500,TRUE);
   can_set_id(&C1RXF4,0x00000500,TRUE);
   can_set_id(&C1RXF5,0x00000500,TRUE);

   can_set_mode(CAN_OP_NORMAL);

Mask1, Filter2, Filter3, Filter4, Filter5 never works. How should i set mask1 and Filter2-5 ?
Thanks in advance.
ZD
newguy



Joined: 24 Jun 2004
Posts: 1907

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PostPosted: Tue Sep 24, 2013 9:18 am     Reply with quote
Code:

   // mask bit n | filter bit n | message ID bit n | result
   //     0             x               x             accept
   //     1             0               0             accept
   //     1             0               1             reject
   //     1             1               0             reject
   //     1             1               1             accept
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