TMS320F28034: How to request slave data when acting as a LIN master

Hi Yale,

Please take a look at the following C2000Ware example: C:\ti\c2000\C2000Ware_version\device_support\f2803x\examples\c28\lina_external_loopback

In general, you have to write the correct ID to the header. All slave nodes will receive the message, but only the slave with a matching ID will respond. 

Best Regards,

Marlyn

Hi Yale,

Yes, I was rereferring to the LINID. The LIN example I pointed to shows how to write to the LINID register and how to setup the RXIDMASK/TXIDMASK. 

  //
    // LIN MASK Configuration 2
    //
    LinaRegs.LINMASK.bit.RXIDMASK = RXID_MASK;	// 0xA
    LinaRegs.LINMASK.bit.TXIDMASK = TXID_MASK;	// 0xA

    //
    // Initialize the Slave LINIDNUM register
    //
    LinaRegs.LINID.bit.IDSLAVETASKBYTE = LINIDNUM_Slave;    // 0x30

    //
    // Release	SCI from software reset state - End of Config
    //
    LinaRegs.SCIGCR1.bit.SWnRST = 1;

    //
    // LIN Response Length
    //
    LinaRegs.SCIFORMAT.bit.LENGTH = RESP_LENGTH;

    for(i=0;i<8;i++)
    {
        //
        // Transmit Data - This populates the LIN transmit
        // buffers - no data is actually sent yet.
        //
        LinaRegs.LINTD0.all = *Tx_DataPtr++;
        LinaRegs.LINTD1.all = *Tx_DataPtr++;

        //
        // Send ID by writing to LINIDNUM register
        // This causes the ID to be written to the bus.  In turn,
        // this causes both TX and RX ID matches in the slave task
        // to occur - causing the data in the transmit buffers to
        // be placed on the bus and also read into the receive buffers
        //
        LinaRegs.LINID.bit.IDBYTE = LIN_ID;	        // 0x3A

Best Regards,

Marlyn

Hi Yale,

Yale Li 李耀先 said:

The customer now sends the header correctly, but the slave does not send the matching message. Do they need to set anything other than LINID (PID)?

How has the customer setup the IDSLAVETASKBYTE, this is also needed so that the slave knows whether a RX response, a TX response, or no action needs to be done by the LIN node.

Best Regards,

Marlyn