typedef  union
{
                unsigned int ival;
                unsigned char  ucval[2];
}              uisval;

uisval     tsx;         //TOUCH SCREEN X
uisval     tsy;         //TOUCH SCREEN Y
uisval     temp1;
uisval     temp2;

//COUNTERS FOR HOW MANY TIMES X AND Y ARE READ
char myvalue = 0x00;
char myvalue1 = 0x00;

//INTERRUPT WHEN PENIRQ GOES LOW
ISR(INT4_vect)  
{
int i;

                EIMSK = 0x00;
                tsx.ival = 0;
                tsy.ival = 0;
                temp1.ival = 0xFFFF;
                temp2.ival = 0;
                myvalue = 0;
                myvalue1 = 0;
                
                PORTB &= 0xFE;                //Enable Touch Interface CS = LOW
                while(temp1.ival != temp2.ival)
                {
                                temp2.ival = temp1.ival;
                    //temp1.ucval[1] = spi_transfer(0xD0);                             // Write Command Measure X-Position 
                                temp1.ucval[1] = spi_transfer(0x00);                      // Read ADC data X-Position (7-bit byte High) data: 0ddddddd           (bit) 
                                temp1.ucval[0] = spi_transfer(0xD0);                     // Read ADC data X-Position (7-bit byte High) data: 0ddddddd           (bit) 
                                myvalue++;                                                                                                                                        
                }
                tsx.ival = temp1.ival;

                temp1.ival = 0xFFFF;
                temp2.ival = 0;

                while(temp1.ival != temp2.ival)
                {
                                temp2.ival = temp1.ival;
                    //temp1.ucval[1] = spi_transfer(0x90);                              // Write Command Measure X-Position 
                                temp1.ucval[1] = spi_transfer(0x00);                      // Read ADC data y-Position (7-bit byte High) data: 0ddddddd           (bit) 
                                temp1.ucval[0] = spi_transfer(0x90);                      // Read ADC data y-Position (7-bit byte High) data: 0ddddddd           (bit) 
                                myvalue1++;                                                                                                                                      
                }
                tsy.ival = temp1.ival;
                PORTB |= 0x01;                                 // Disable Touch Interface CS = HIGH

                tsx.ival = tsx.ival/8;
                tsy.ival = tsy.ival/8;
                EIMSK = 0x10;
}