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CCS/TMS320F28377S: 28377s, CAN Communication, CAN Receive, CAN Transmit

KWON CHEOLSOON
Prodigy 70 points
Part Number: TMS320F28377S

Tool/software: Code Composer Studio

Hello everyone.

We are currently building a system using the 28377S.

The 28335 and 28377S are so different because of the CAN communication.

28377S In the case of CAN communication, if multiple IDs are transmitted at the same time, ID transferred later may become Ignore.

To solve this problem, use Delay_us () to delay the code as shown below.

Using Delay is fine, but it seems to be systemically unstable, so I'm looking for another way.

I would like to receive the status value of the current status of CAN communication and wait for the transmission and transmit the next ID. Do you have any other commands?

We are creating and using ECanaMbox for use similar to the 28335 system.

Thank you for your reply.

void CANA_Transmit_Func(void)
{

    unsigned char i =0;

    for(i=0;i<=32;i++)
    {
        if(ECanaRegs.CANTRS[i].bit.TRS == 1)
        {
            ECanaRegs.CANTRS[i].bit.TRS = 0;

            CANA_sTXCANMessage.ui32MsgID = ECanaMboxes.MBOX[i].MSGID.all;
            CANA_sTXCANMessage.ui32MsgIDMask = 0;
            CANA_sTXCANMessage.ui32Flags = 0;
            CANA_sTXCANMessage.ui32MsgLen = 8;
            CANA_txMsgData[0] = ECanaMboxes.MBOX[i].MDL.byte.BYTE0;
            CANA_txMsgData[1] = ECanaMboxes.MBOX[i].MDL.byte.BYTE1;
            CANA_txMsgData[2] = ECanaMboxes.MBOX[i].MDL.byte.BYTE2;
            CANA_txMsgData[3] = ECanaMboxes.MBOX[i].MDL.byte.BYTE3;
            CANA_txMsgData[4] = ECanaMboxes.MBOX[i].MDH.byte.BYTE4;
            CANA_txMsgData[5] = ECanaMboxes.MBOX[i].MDH.byte.BYTE5;
            CANA_txMsgData[6] = ECanaMboxes.MBOX[i].MDH.byte.BYTE6;
            CANA_txMsgData[7] = ECanaMboxes.MBOX[i].MDH.byte.BYTE7;

            CANA_sTXCANMessage.pucMsgData = CANA_txMsgData;
            CANMessageSet(CANA_BASE, TX_MSG_OBJ_ID, &CANA_sTXCANMessage,MSG_OBJ_TYPE_TX);
            CANA_status = CANIntStatus(CANA_BASE, CAN_INT_STS_CAUSE);

             DELAY_US(300);

        }
    }


}

  • 0
    TI__Guru* 95315 points

    Kwon,

                Are you saying that when multiple IDs are marked for transmission, some IDs fail to transmit? This should not happen. Have you tried polling the TxRqst bit to ascertain completion of transmission? Per spec "After a successful transmission and if no new data was written to the message object (NewDat = '0') since the start of the transmission, the TxRqst bit will be reset". Another option is to use the TxOk bit in CAN_ES register. Not sure if your code uses interrupts, but you could have an interrupt asserted upon successful transmission. There is no need to rely on a delay.

  • 0 in reply to Hareesh Janakiraman
    Prodigy 70 points
    Thank you for your answer.

    Can I use CANStatusGet () function of CAN example for TXOK of CAN_ES register?

    Is it written like this?

    CANB_status = CANStatusGet (CANB_BASE, CAN_STS_CONTROL);