TMS570LC4357: sciReceive api use for input of different length

Hello,

1. You can define the communication protocol between two UART devices. Before sending the real data ( 2bytes, 3 bytes or ...), the device sends the length first.

2. You can add time-out code to sciReceive() function. 

    time_out = 0;

    while (length > 0U)  // you can use a big value for length for example length=100; or you can change the loop as while(1)
    {

             time_out++:

             /*SAFETYMCUSW 28 D MR:NA <APPROVED> "Potentially infinite loop found - Hardware Status check for execution sequence" */
            while ((sci->FLR & (uint32)SCI_RX_INT) == 0U)
            {

                  if (time_out > xxx)

                      break or return
            } /* Wait */

            /*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are only allowed in this driver" */
           *data = (uint8)(sci->RD & 0x000000FFU);
           

            /*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are only allowed in this driver" */
            /*SAFETYMCUSW 567 S MR:17.1,17.4 <APPROVED> "Pointer increment needed" */
            data++;
            length--;
      }

 how to send different data length each time 

example : on SCI3 port  I want to receive the input data of different length.

How timer will help to skip length precondiion to receive data using void sciReceive(sciBASE_t *sci, uint32 length, uint8 * data).

I don't want to use length as highlighted in above image, as I will send data of different length each time.

Is it possible ?

It depends on how you send data to TMS570 device. 

You can use time-out if you know the longest interval between each char.

You can send a special char to tell the receiver this is the last char.