TMS320F28027: SCI communication is not receiving continuously.

Dear all;

I am using F28027 and I am trying to make a communication on SCI between two DSP. Transmitter is transmitting the data. I have observed iton scope. However reciever is not receiving continuously. I have a delay loop in transmitter code and the longer I keep the delay time, the more receiver stuck on while condition to check flag. When I increase delay time code is waiting on while continuously, like there is no incoming data. When I make shorter delay time, it stuck less. Could someone tell me how to get rid of this problem. Here is my transmitter and receiver codes.

   for(;;)
	    {
	    	SendChar=0;
	    	for (SendChar=1; SendChar<=255; SendChar++)
	    	{
	    		delay_loop();
	    		scia_txmit(SendChar);
	    		/*while(SciaRegs.SCIFFRX.bit.RXFFST !=1) { } // wait for XRDY =1 for empty state
	    		// Check received character
	    		ReceivedChar = SciaRegs.SCIRXBUF.all;
	    		if(ReceivedChar != SendChar) error();
	    		LoopCount++;*/
	    	}
	    }

void scia_init()
		{

	  	    //02.03.2017 SCI configuration for bluetooth
	  	    EALLOW;
	  	    GpioCtrlRegs.GPAPUD.bit.GPIO28 = 0; 	//enable pull-up for gpio28(SCIRXDA)
	  	    GpioCtrlRegs.GPAPUD.bit.GPIO29 = 1; 	//disable pull-up for gpio29(SCITXDA)
	  	    GpioCtrlRegs.GPAQSEL2.bit.GPIO28 = 3;	//asynch input GPIO28 (SCIRXDA)
	  	    GpioCtrlRegs.GPAMUX2.bit.GPIO28 = 1;	//configure gppio as SCI transmitter
	  	    GpioCtrlRegs.GPAMUX2.bit.GPIO29 = 1; 	//configure gppio as SCI reciever
	  	    EDIS;



			SciaRegs.SCICCR.bit.STOPBITS = 0; 		//one stop bit
			SciaRegs.SCICCR.bit.PARITYENA = 0; 		//disable parity
			SciaRegs.SCICCR.bit.LOOPBKENA = 0;		//loop back disable(when Tx connected internaly Rx)
			SciaRegs.SCICCR.bit.ADDRIDLE_MODE = 0;	//idle mode enable
			SciaRegs.SCICCR.bit.SCICHAR = 7;		//bith lenght is 8 bits

			SciaRegs.SCICTL1.bit.TXENA = 1;			//transmitter enable
			SciaRegs.SCICTL1.bit.RXENA = 1;			//receiver enable

			SciaRegs.SCICTL2.bit.TXINTENA = 1;		//Enable TXRDY interrupt
			SciaRegs.SCICTL2.bit.RXBKINTENA = 1;	//enable RXRDY interrupt
			//örnekte ikikez yazılmış?

			SciaRegs.SCIHBAUD = 0x0000;
			SciaRegs.SCILBAUD = 0x000F;					//LSPCLK = 12.5 MHz (50 MHz SYSCLK)  baud=LSPCLK/(16*8)

			SciaRegs.SCICCR.bit.LOOPBKENA =1; // Enable loop back
			SciaRegs.SCICTL1.all =0x0023;     // Relinquish SCI from Reset
		}

		//transmitter function
		void scia_txmit(int a)
		{

			SciaRegs.SCITXBUF = a;

		}

		void scia_fifo_init()
		{
			SciaRegs.SCIFFTX.all=0xE040;
			SciaRegs.SCIFFRX.all=0x2044;
			SciaRegs.SCIFFCT.all=0;
		}

		void delay_loop()
		{
			short      i;
			for (i = 0; i < 100; i++) {}
		}

the code which is written above is for transmitter side.

I used timer interrupt for delay time but I had same problem.

For receiver side, I have described a variable named Received as uint8. Nevertheless, receiver dsp shows it as unsigned char. I want to learn why. and like I said before, it is stucking on while condition frequently (depends on delay time)

And here is receiver code

for(;;) {
	        //asm(" NOP"); // main loop (interrupt bekle)
	    	SciaRegs.SCICTL1.bit.RXENA = 1;
	    	while(SciaRegs.SCIRXST.bit.RXRDY == 0) { } // wait for XRDY =1 for empty state
	    	//while(SciaRegs.SCIFFRX.bit.RXFFST !=1) { }
	    	       // Get character
	    	Received = SciaRegs.SCIRXBUF.all;
	    	Received = Received & 0x00FF;
	    	SciaRegs.SCIFFRX.bit.RXFFINTCLR = 1;
	    	//asm (" NOP");
	    	//SciaRegs.SCIFFRX.bit.RXFFINTCLR = 1;
	    }

void scia_init()
		{

	  	    //02.03.2017 SCI configuration for bluetooth
	  	    EALLOW;
	  	    GpioCtrlRegs.GPAPUD.bit.GPIO28 = 0; 	//enable pull-up for gpio28(SCIRXDA)
	  	    //GpioCtrlRegs.GPAPUD.bit.GPIO29 = 1; 	//disable pull-up for gpio29(SCITXDA)
	  	    GpioCtrlRegs.GPAQSEL2.bit.GPIO28 = 3;	//asynch input GPIO28 (SCIRXDA)
	  	    GpioCtrlRegs.GPAMUX2.bit.GPIO28 = 1;	//configure gppio as SCI reciever
	  	    //GpioCtrlRegs.GPAMUX2.bit.GPIO29 = 1; 	//configure gppio as SCI transmitter
	  	    EDIS;



			SciaRegs.SCICCR.bit.STOPBITS = 0; 		//one stop bit
			SciaRegs.SCICCR.bit.PARITYENA = 0; 		//disable parity
			SciaRegs.SCICCR.bit.LOOPBKENA = 0;		//loop back disable(when Tx connected internaly Rx)
			SciaRegs.SCICCR.bit.ADDRIDLE_MODE = 0;	//idle mode enable
			SciaRegs.SCICCR.bit.SCICHAR = 7;		//bith lenght is 8 bits

			//SciaRegs.SCICTL1.bit.TXENA = 1;			//transmitter enable
			SciaRegs.SCICTL1.all = 0x0001;			//receiver enable

			//SciaRegs.SCICTL2.bit.TXINTENA = 1;		//Enable TXRDY interrupt
			SciaRegs.SCICTL2.all = 0x0002;	//enable RXRDY interrupt
			//örnekte ikikez yazılmış?

			//autobaud detection(14.03.2017)
			SciaRegs.SCIFFCT.bit.CDC = 1;		//Enable aoutoboaud aligment
			SciaRegs.SCIFFCT.bit.ABDCLR = 1;    //clear abd bit

			SciaRegs.SCIHBAUD = 0x0000;					//selact a baud speed below 500 kbps
			SciaRegs.SCILBAUD = 0x0001;					//LSPCLK = 12.5 MHz (50 MHz SYSCLK)  baud=LSPCLK/(16*8)

			//SciaRegs.SCICCR.bit.LOOPBKENA =1; // Enable loop back
			SciaRegs.SCICTL1.all =0x0021;     // Relinquish SCI from Reset

			//SciaRegs.SCIFFTX.bit.TXFIFOXRESET=1;		//enable fifo tx interrupt so as to disable autobaud
		}

	void scia_fifo_init()
	{
	    SciaRegs.SCIFFTX.all=0xE040;
	    SciaRegs.SCIFFRX.all=0x2044;
	    SciaRegs.SCIFFCT.all=0x0;
	}

I will be glade if someone help me immediately.

Thanks a lot.

Regards

Fahri