CAN Communication problem（S12ZVM）

[maxxu]

Hi

   Hello everyone，I use S12ZVML32 for can communication，

   The settings are as follows： 

    CAN0IDAC_IDAM = 0; /* Two 32 bit filters */

    CAN0IDAR0 = 0x64;  //ID 0X322
    CAN0IDAR1 = 0x40;

   CAN0IDMR0 = 0x00; /* Accept all incoming ID's */
   CAN0IDMR1 = 0x07;
   CAN0IDMR2 = 0xFF;
   CAN0IDMR3 = 0xFF;
   CAN0IDMR4 = 0x00;
   CAN0IDMR5 = 0x07;
   CAN0IDMR6 = 0xFF;
   CAN0IDMR7 = 0xFF;

   （1）   I can receive not only the data with ID = 0x322, but also the data with ID = 0X000. According to the settings, only ID = 0X322 can match, and whether ID = 0X000 is unconditional？

   （2）  Why？Both  first 32-bit filter bank (CANIDAR0–CANIDAR3, CANIDMR0–CANIDMR3)  and

                         the second filter bank (CANIDAR4–CANIDAR7, CANIDMR4–CANIDMR7)  must be set

[lama]

Hi,

both filters are active so if you want the only value also second filter IDAR must be set.

  CAN0IDAR0 = 0x64;  //ID 0X322
  CAN0IDAR1 = 0x40;

  CAN0IDAR4 = 0x64;  //ID 0X322
  CAN0IDAR5 = 0x40;

In your case you receive also message corresponding to IDAR4,5 and IDMR4,5 combination for default values.

Best regards,

Ladislav.

[maxxu]

Thank you. The problem has been solved.