S32K144 Simple FlexCan Tx not working

[ck182]

Hi,

i am newbie in S32K1 Platform

I try to get can-bus communication on S32K144 demo board.

I start with FlexCAN_Ip_example_S32K144 in loopback and change to normal operation and map the CAN0 RX TX pin but nothing out of TX pin.

This is the main code:

/* Initialize the Osif driver */

    OsIf_Init (NULL_PTR);

    /* Write your code here */

    Clock_Ip_Init(&Clock_Ip_aClockConfig[0]);

    /* Configure pins */

    Port_Ci_Port_Ip_Init(NUM_OF_CONFIGURED_PINS0, g_pin_mux_InitConfigArr0);

    IntCtrl_Ip_EnableIrq(CAN0_ORed_0_15_MB_IRQn);

    IntCtrl_Ip_InstallHandler(CAN0_ORed_0_15_MB_IRQn, CAN0_ORED_0_15_MB_IRQHandler, NULL_PTR);

    Flexcan_Ip_DataInfoType tx_info = {

            .msg_id_type = FLEXCAN_MSG_ID_STD,

            .data_length = 8u,

            .is_polling = TRUE,

            .is_remote = FALSE,

.fd_enable = FALSE,

    };

    Flexcan_Ip_MsgBuffType rxData;

    FlexCAN_Ip_Init(INST_FLEXCAN_0, &FlexCAN_State0, &FlexCAN_Config0);

    FlexCAN_Ip_ExitFreezeMode(INST_FLEXCAN_0);

    FlexCAN_Ip_SetStartMode(INST_FLEXCAN_0);

    Lpspi_Ip_StatusType ret;

    Flexcan_Ip_StatusType FlexCAN_Api_Status;

    /*

     * SPI Init

     */

    ret=Lpspi_Ip_Init(&Lpspi_Ip_PhyUnitConfig_SpiPhyUnit_0_Instance_1_BOARD_InitPeripherals);

    Spi_TxBuffer[0]=0x40;//sarebbe 0x20 shifttato di un bit

    Spi_TxBuffer[1]=0x2; //sarebbe b010 su attivazione della con

    ret=Lpspi_Ip_SyncTransmit(&SPI_IC, Spi_TxBuffer, Spi_RxBuffer,2,5000);

    delay(1000);

    while(1){

    FlexCAN_Api_Status = FlexCAN_Ip_Send(INST_FLEXCAN_0, TX_MB_IDX, &tx_info, MSG_ID, (uint8 *)&dummyData);

        // Polling

        while(FlexCAN_Ip_GetTransferStatus(INST_FLEXCAN_0, TX_MB_IDX) != FLEXCAN_STATUS_SUCCESS)

        {

        FlexCAN_Ip_MainFunctionWrite(INST_FLEXCAN_0, TX_MB_IDX);

        }

    delay(720000);

    }

Also if there are any tutorial/example are usefull

Thank you in advantage,

Patrick

[PetrS · Accepted solution]

Hi,

there can be several reasons why it does not work. Ideally is to measure TXD/RXD/and CAN bus lines with scope/analyzer and read module MCR/CTRL1/ECR/ESR1 registers to see module status and if any error are detected.
If you do not see anything on TXD pin, common issues are
- pin initialization
- CAN transceiver status. On EVB be sure SBC's CAN transceiver is active. Power EVB by external 12V 

BR, Petr

[ck182]

Thank you very much for your time. To fix my mistakes:
- Power EVB by external 12V
- .is_polling = FALSE

Thank you,
Patrick