CCS/TMS570LS1227: TMS570 : Using SCI Transmit Interrupt Error related, continuous 1byte Transmit Problem

Tool/software: Code Composer Studio

Problems occurring

At the time of data transfer, sometimes first data is continuously transmitted.

For example

- Data make

for(u=0; u<64; u++)

sciSend(sciREG,64,x[u]);

---------------------------------------

- Data Transmit(Main while loop)

sciSend(sciREG,1,x[i]);

i++

if( i ==64)

{

i=0;

}

---------------------------------------

When sending 64 bytes, after sending the intended data, the data at address 0 is sometimes copied to the next 8 addresses.
It is confirmed that this phenomenon occurs periodically.

-------------------------------------------------------------------------------------------------------------------

The cause of the problem I grasped is SCI TX Interrupt Set.

Halcogen : VIM SCI Level 0 Interrupt set , SCI Interrupt enable and High Level set

scisendbyte() => TX Interrupt running and Interrupt clear => Wait scisendbyte()

-------------------------------------------------------------------------------------------------------------------

sci TX Interrupt set is added inside the used scisendbyte() function.

This is because an interrupt does not occur when used as a provided function.(spnu515 See section 30.3.1)

USER CODE BEGIN : sci->SETINT = (uint32)SCI_TX_INT;

It is running without any problem with TX interrupt disabled.

I want to know if the usage is correct.

*Only SCI communication is available. It cannot be changed to LIN2.*