AVR Freaks

//function for reading data from adc using usart spi
void USARTSPI_ReadADS1252(void)
{
            //declare 8bit WatchDRDY to detect DRDY mode
            unsigned char WatchDRDy;

    			//Watch for Data ready
            WatchDRDy = (PINC & 0x02 );
			//if Data ready occurs, do nothing
			while (WatchDRDy == (PINC & 0x02 ))
			{
                //do nothing
			};

            // make the whole delay to 22us to pass through the DRDY mode
            _delay_us ( 4);

			//PORTC0 toggle for debugging purpose
			PORTC ^= (1);


            //Write to data register to initiate data transfer

            UDR0= 0;
            //Wait till you've received 8 bits
            //Do nothing  when Receive Complete Flag is ZERO (  means when it has not yet completely received data)
            while ((USART_CSR_A_Receive_Flag  & UCSR0A) == 0)
            {
            }
            //Read the data
            //UDR0 is the 8- bit USART Data Register
            Data[2] = UDR0;


            UDR0 = 0;
            while ((USART_CSR_A_Receive_Flag  & UCSR0A) == 0)
            {
            }
            Data[1] = UDR0;


            UDR0 = 0;
            while ((USART_CSR_A_Receive_Flag & UCSR0A) == 0)
            {
            }
            Data[0] = UDR0;

};

void USART_RS232_Interfacing(void)
{
	//formula to delay and count 8 times - to fool the optimiser
    int Loop_StopFlag = 0;
    int Loop = 0;

    while ( Loop_StopFlag == 0)
    {
        Loop = (Loop + 1) & 7;

        if (Loop == 0)
        {
            Loop_StopFlag = 1;
            break;
        }
    }
	//at the 8th count, Loop will give 0
	if (Loop_StopFlag == 1 )
	{
		//get Data[] into another variable ToUsart1[]
		ToUsart1[0] = Data[0];
		ToUsart1[1] = Data[1];
		ToUsart1[2] = Data[2];


        //stream location counter initialisation
        int streamLoc = 0;

        //stream out data from  ToUsart1[0..2]
        while (streamLoc < 3)
        {
            // Send out the byte value in the variable ToUsart[0..2] to dara register of Usart_RS232
            UDR1 = ToUsart1[streamLoc];

            // Do nothing until UDR is ready for more data to be written to it by checking register empty flag
            while ((UCSR1A & USART_CSR_A_Data_Register_Empty_Flag  ) == 0) {}

            // increment stream location counter 0..2
            streamLoc++;
        }

        while ((UCSR1A & USART_CSR_A_Data_Register_Empty_Flag  ) == 0) {}
	}