DZ60 CAN模块求教

gaylexia

我的DZ60 然后收发器用的是250，但是发送端一直没有数据，是什么原因呢。。底层用的是飞思卡尔官网提供的程序。外部晶振8M总线是16M，这是MCG初始化和CAN初始化的程序。
UINT8 CAN_Init(UINT8 rmode)
{
      UINT8 errorStatus,                               /* error code from Reset_CAN */
            i;                                         /* loop counter */

#if defined(EEPROM_SECURITY_CHECK)
            /* test for correct value in EEPROM */
 if (CAN_dataCheck != EEPROM_SECURITY)
 {
            /* if test fails do not initialise */
  return(ERR_OK);
 }
#endif /* EEPROM_SECURITY_CHECK */
      errorStatus = CAN_Reset(rmode);                      /* reset msCAN */
      if (errorStatus != ERR_OK)
      {
            return (errorStatus);
      }
      CANCTL1 = CANCTL1_Def;                                /* initialise hardware registers */
      CANBTR0 = CANBTR0_Def;
      CANBTR1 = CANBTR1_Def;
      CANIDAC = CANIDAC_Def;
      for (i = 0; i < NO_OF_FILTER_REG; i++)         
      {
            *(&CANIDAR0 + i) = CANIDFilter_Def;              /* initialise hardware acceptance filter  */
      }
      CANCTL0 &= ~INITRQ;                                     /* clear soft reset */
      CANCTL0 = CANCTL0_Def;                                 /* must write separate from clearing SFTRST */
      for (i = 0 ; i < NoOfMB ; i++)                         /* configure all MB's to CLOSED, NODATA */
      {
            BufferMode_CAN = CLOSED;
            BufferStatus_CAN = NODATA;
      }
      MB_MSCAN[0] = 0xff;                                    /* more efficient than for loop */
      MB_MSCAN[1] = 0xff;
      MB_MSCAN[2] = 0xff;
     
      MBP_MSCAN[0] = 0xff;
      MBP_MSCAN[1] = 0xff;
      MBP_MSCAN[2] = 0xff;
     
#if (NO_OF_MSCAN_TXBUFFER != 3)
#error MB_MSCAN not initialised
#endif
     
      if (CANCTL1 & INITAK) return ERR_INIT;
     
      CLI;                                                   /* clear interrupt mask */
      CANRIER = 0x01;                                        /* enable Receive Interrupts */
      if ((CANRFLG & BUSOFF) == BUSOFF)                     /* Bus-off */
      {
                  return (ERR_BOFF);
      }
      else
      {
            return (ERR_OK);
      }
}

#define CANCTL0_CAN ((CSWAI_CAN

我知道答案 目前已有1人回答

阅读全文

安

你接CAN收发器了吗？另外CAN总线上连接120欧姆电阻没有？

gaylexia

回复第 2 楼 于2012-07-10 14:09:34发表:
你接CAN收发器了吗？另外CAN总线上连接120欧姆电阻没有？ 

收发器接的是82C250,120欧电阻接与不接都试过不行，因为我现在测试的两点间距很短，所以我把120欧电阻去掉了