QG8 Hanging on Power Reset when UART accessed

[jimstevens]

I've got a simple application that hangs on power reset.  I'm programming it with the P&E USB Multilink through the debug screen in CodeWarrior.  The target is set correctly.

Once I disconnect the P&E and do a power cycle, the chip just hangs.  I'm using LEDs to verify correct operation.

However, if I comment out my readData (listed below) function which reads data from the UART, everything will function on a power reset.  I've tried both interrupt based and polling for the UART, and it makes no difference.

//=============================================================================
// readData
//-----------------------------------------------------------------------------
//=============================================================================
int readData(void *dataBuffer, int dataBufferSize)
{
int          returnValue = 0;
int   i;

  // If we have a bad data buffer pointer then we fail.
  if(dataBuffer == 0)
  {
     goto EXIT;
  }

  for(i=0;i<dataBufferSize;i++) {
          
   while (SCIS1_RDRF == 0);
     
   ((unsigned char*)dataBuffer)[i] = SCID;
   
   SCIS1_RDRF = 0;      //acknowledge Receiver Full flag

        
  }

  returnValue = 1;
  EXIT:
  return returnValue;
}

Is there something about the RX on the UART that would prevent the chip from reseting properly?

I also have a TX function in there and it works fine.  So I don't think it's the entire UART.

Any help is greatly appreciated.

James

[peg]

Hi Jim,

The COP is timing out while waiting for the data???

Disable COP or feed dog in your waiting for data to fill buffer loop.

Regards David