S12 / MagniV MicrocontrollersのトピックRe: CAN Communication problem（S12ZVM）

CAN Communication problem（S12ZVM）

maxxu — Wed, 11 Sep 2019 08:38:45 GMT

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

Re: CAN Communication problem（S12ZVM）

lama — Wed, 11 Sep 2019 12:58:41 GMT

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.

Re: CAN Communication problem（S12ZVM）

maxxu — Thu, 12 Sep 2019 02:22:11 GMT

Thank you. The problem has been solved.