Locked processor with SCI half-duplex

Hi

I am working on LAUNCHXL-F28027 C2000 Piccolo LaunchPad.

Currently I am programming the periphery SCI. I use transmitting functions from example Example_2802xSci_Echoback.c without FIFO.
These functions are changed to half-duplex mode. At the beggingng I set on SCI only to RX mode and during transmition SCI is set to TX.
This functions are paste in Motorwave projects proj_lab01.c with your sci driver.

Here is code of transmitting functions:

void HAL_scia_xmit(int a, HAL_Handle handle)
{
    HAL_Obj   *obj = (HAL_Obj *)handle;
    while(!SCI_txEmpty(obj->sciHandle)){}
    SCI_putDataBlocking(obj->sciHandle, a);


}

void HAL_scia_msg(char * msg, HAL_Handle handle)
{
    HAL_Obj  *obj = (HAL_Obj *)handle;

  SCI_reset(obj->sciHandle);
    SCI_enableTx(obj->sciHandle);
    SCI_disableRx(obj->sciHandle);
    SCI_enable(obj->sciHandle);

    int i = 0;
    while(msg[i] != '\0')
    {
        HAL_scia_xmit(msg[i], handle);
        i++;
    }
    while(!SCI_txEmpty(obj->sciHandle)){}

      SCI_reset(obj->sciHandle);
      SCI_disableTx(obj->sciHandle);
      SCI_enableRx(obj->sciHandle);
      SCI_enableRxInt(obj->sciHandle);
      SCI_enable(obj->sciHandle);
}

static inline bool SCI_txEmpty(SCI_Handle sciHandle)
{
  SCI_Obj *sci = (SCI_Obj *)sciHandle;
  bool status;

  status = (sci->SCICTL2 & SCI_SCICTL2_TXEMPTY_BITS) >> 6;

  return status;
}

For receiveing data is used PIE interrupt SCIRXINTA.
Initialization of SCI is taken over from example.
SCI periphery is correct beause of it was tested in full-duplex SCI mode.

In half-duplex where the change RX and TX without FIFO occurs a problem locking the processor.
The first time debug was performed successfully. But the next time debugging error occurs while cleaning flash and CSM key is overwritten at all zeros.