CAN: 29-Bit mode geht nicht

[Dummer Coder (Gast)]

Hab hiern SAM3X8E mit nem abegeänderten Example von Atmel der an nem 
Simulator läuft. Im 11-Bit Standard Mode funktioniert der Datenverkehr. 
Auf dem Oszi sehe ich jedoch, daß im 29-Bit Extended-ID Mode der 
Simulator auf eine Anfrage kein Paket zurücksendet.

Bis jetzt habe ich im Datenblatt nur gefunden, daß man das Bit MIDE für 
die ID-Version (Standard-ID CAN Vers. A 11-Bit/Extended-ID CAN Vers. B 
29-Bit) umschalten muß.

Hab ich noch etwas vergessen? Oder mache ich grundsätzlich was faltsch?

void getECUData(can_mb_conf_t *p_sc_mailbox_rx, can_mb_conf_t *p_sc_mailbox_tx) {    
    
    /* Note: The CAN transceiver should be configured before initializing the CAN module. */
    can_reset_all_mailbox(CAN0);    
    reset_mailbox_conf(p_sc_mailbox_rx);

    /* Init CAN0 Mailbox 1 to Reception Mailbox. */
    p_sc_mailbox_rx->ul_mb_idx = TEST1_CAN_COMM_MB_IDX + 1;  //mailbox 1
    p_sc_mailbox_rx->uc_obj_type = CAN_MB_RX_MODE;
    p_sc_mailbox_rx->ul_id_msk = CAN_MAM_MIDvA_Msk | CAN_MAM_MIDvB_Msk; //CAN 2.0A + B    
    if (!eepromData[EEPROM_CAN_11_29_BIT_ID]){
      p_sc_mailbox_rx->ul_id = CAN_MID_MIDvA(0x7E8);  //get 7E8 from engine control module
      p_sc_mailbox_rx->uc_id_ver = 0; // 0/1: standard/extended frame  
    }
    else  {
      p_sc_mailbox_rx->ul_id = CAN_MID_MIDvB(0x7E8);  //get 7E8 from engine control module    
      p_sc_mailbox_rx->uc_id_ver = 1; // 0/1: standard/extended frame
    }  
    can_mailbox_init(CAN0, p_sc_mailbox_rx);
    

// RELEVANTE SENDEROUTINE AB HIER --------------------------------


    /* Init CAN0 Mailbox 0 to Transmit Mailbox. */
    p_sc_mailbox_tx->ul_mb_idx = TEST1_CAN_COMM_MB_IDX;    //mailbox 0
    p_sc_mailbox_tx->uc_obj_type = CAN_MB_TX_MODE;
    p_sc_mailbox_tx->uc_tx_prio = TEST1_CAN0_TX_PRIO;
    p_sc_mailbox_tx->ul_id_msk = CAN_MAM_MIDvA_Msk | CAN_MAM_MIDvB_Msk; //CAN 2.0A + B
    can_mailbox_init(CAN0, p_sc_mailbox_tx);

    /* Write transmit information into mailbox. */
    if (!eepromData[EEPROM_CAN_11_29_BIT_ID]){
      p_sc_mailbox_tx->ul_id = CAN_MID_MIDvA(0x7DF);  // engine control module
       p_sc_mailbox_tx->uc_id_ver = 0; // 0/1: standard/extended frame
    }
    else {
      p_sc_mailbox_tx->ul_id = CAN_MID_MIDvB(0x7DF);  // engine control module
       p_sc_mailbox_tx->uc_id_ver = 1; // 0/1: standard/extended frame
      printf ("DEBUG: in getECUData(); 29bit frame mode\r\n");       
    }
    //p_sc_mailbox_tx->ul_datal = ...; set by caller
    //p_sc_mailbox_tx->ul_datah = ...;
    p_sc_mailbox_tx->uc_length = MAX_CAN_FRAME_DATA_LEN; // 8bytes
    can_mailbox_write(CAN0, p_sc_mailbox_tx);
    can_enable_interrupt(CAN0, CAN_IER_MB1);
    
    /* Send out the information in the mailbox. */
    can_global_send_transfer_cmd(CAN0, CAN_TCR_MB0);


// RELEVANTE SENDEROUTINE BIS HIER --------------------------------


}