PIC empfängt keine CAN-Bus-Nachrichten?

/*******************************************************************************

     MCU:             PIC18F66K80

     Oscillator:      HS, 18.0000 MHz

 ******************************************************************************/

char SJW, BRP, Phase_Seg1, Phase_Seg2, Prop_Seg;

unsigned char Can_Init_Flags, Can_Send_Flags, Can_Rcv_Flags; // can flags

unsigned short init_flag, send_flag, dt, len, read_flag;

unsigned char Rx_Data_Len;                                   // received data length in bytes

char RxTx_Data[8];                                           // can rx/tx data buffer

char Msg_Rcvd;                                               // reception flag

const long ID_1st = 1365, ID_2nd = 170;                       // node IDs

long Rx_ID, mask;

void main() {

  TRISD = 0;

  TRISE = 16;                                             // RE4 as input, RE5 as output

  PORTC = 0;                                                // clear PORTC

  TRISC = 0;                                                // set PORTC as output

  Can_Init_Flags = 0;                                       //

  Can_Send_Flags = 0;                                       // clear flags

  Can_Rcv_Flags  = 0;                                       //

  Can_Send_Flags = _CAN_TX_PRIORITY_0 &                     // form value to be used

                   _CAN_TX_XTD_FRAME &                      //     with CANWrite

                   _CAN_TX_NO_RTR_FRAME;

  Can_Init_Flags = _CAN_CONFIG_SAMPLE_THRICE &              // form value to be used

                   _CAN_CONFIG_PHSEG2_PRG_ON &              // with CANInit

                   _CAN_CONFIG_XTD_MSG &

                   _CAN_CONFIG_DBL_BUFFER_ON &

                   _CAN_CONFIG_VALID_XTD_MSG;

SJW = 1;

BRP = 3;

Phase_Seg1 = 7;

Phase_Seg2 = 8;

Prop_Seg = 7;

     init_flag = _CAN_CONFIG_SAMPLE_THRICE  &

                 _CAN_CONFIG_PHSEG2_PRG_ON  &

                 _CAN_CONFIG_STD_MSG        &

                 _CAN_CONFIG_DBL_BUFFER_ON  &

                 _CAN_CONFIG_VALID_STD_MSG  &

                 _CAN_CONFIG_LINE_FILTER_OFF;

     send_flag = _CAN_TX_PRIORITY_0          &

                 _CAN_TX_STD_FRAME           &

                 _CAN_TX_NO_RTR_FRAME;

     read_flag = 0;

//

// Initialise CAN module

//

      CANInitialize(SJW, BRP, Phase_Seg1, Phase_Seg2, Prop_Seg, init_flag);

//

// Set CAN CONFIG mode

//

      CANSetOperationMode(_CAN_MODE_CONFIG, 0xFF);

      mask = -1;

//

// Set all MASK1 bits to 1's

//

       CANSetMask(_CAN_MASK_B1, mask, _CAN_CONFIG_STD_MSG);

//

// Set all MASK2 bits to 1's

//

      CANSetMask(_CAN_MASK_B2, mask, _CAN_CONFIG_STD_MSG);

//                                                            mask

// Set id of filter B1_F1 to 3

//

      CANSetFilter(_CAN_FILTER_B1_F1,  0x3,_CAN_CONFIG_STD_MSG);   // receive messages with identifier = 3

      CANSetFilter(_CAN_FILTER_B1_F2,  0x4,_CAN_CONFIG_STD_MSG);   // receive messages with identifier = 4

      CANSetFilter(_CAN_FILTER_B2_F1,  0x5,_CAN_CONFIG_STD_MSG);   // receive messages with identifier = 5

      CANSetFilter(_CAN_FILTER_B2_F2,  0x6,_CAN_CONFIG_STD_MSG);   // receive messages with identifier = 6

      CANSetFilter(_CAN_FILTER_B2_F3,  0x7,_CAN_CONFIG_STD_MSG);   // receive messages with identifier = 7

      CANSetFilter(_CAN_FILTER_B2_F4,  0x8,_CAN_CONFIG_STD_MSG);   // receive messages with identifier = 8

//

// Set CAN module to NORMAL mode

//

      CANSetOperationMode(_CAN_MODE_NORMAL, 0xFF);

 RxTx_Data[0] = 9;

 PORTC = 0x2;

 //CANWrite(Rx_ID, RxTx_Data, 1, send_flag);

     for(;;)                                      // Endless loop

     {

         //

         // Wait until a request is received

         //

         dt = 0;

         while(!dt) dt = CANRead(&Rx_ID,  RxTx_Data, &len, &read_flag);

         if(Rx_ID == 507)

         {

          PORTC = 0xFF;

         }

         else

         {PORTC = 0x1;}

      }

}