#define begin {
#define end }

#include <mega32.h>
#include <sdcard.c>
#include <delay.h>

void initialize();

char p_ready;
unsigned long present_sector;
unsigned int i,j;

//*********************************************
interrupt [EXT_INT1] void extint1(void)
begin
	// set flag to indicate that data is ready to read on 	
	// the parallel bus
	p_ready = 1;            

end


//*********************************************
void main()
begin

	initialize();
  	i = 0;
  	j = 0;

     // wait for the start byte on the parallel port (0xff)
  	while (PINC.1 == 0)
  	begin
    		PORTB.3 = 1;      // toggle the interrupt
    		delay_us(50);
    		PORTB.3 = 0;
    		delay_us(50);
  	end
  
  	PORTB.3 = 1;
  	p_ready = 0;
  	delay_us(50);
  	PORTB.3 = 0;


 

	while(1)
	begin
		if (p_ready)
	  	begin
	    
	    		PORTB.3 = 1;    			// clear parallel interrupt
	    		sector_array_AD[j] = PINC;    // read parallel bus
	    		j++;                          // increment parallel counter
	    		p_ready = 0;				// clear flag
	    		PORTB.3 = 0;                  // interrupt to indicate read is finished
	  	end
	  
	  	if (j == 512)                      // after reading a full sector of data
	  	begin
          	PORTB.1 = 1;                  // toggle an LED to show SD card activity
 			SD_Write((unsigned long)(400+i)<<9);     // write to SD starting at sector 400
		  	i++;								// increment sector counter
		  	j = 0;                                  // reset counter
			PORTB.1 = 0;                            // toggle LED
		end  	
	end



end
//**********************************************************        
void initialize()
begin
     char result = 1;
     
	// SPI ISR disabled, SPI enabled, MSB first, master, SCK = 8MHz
   	SPCR = 0b01010000;
   	SPSR.0 = 1;
    	
    	
    	// trigger external INT0 in falling edge of INT0 (MCUCR.1,0 = 10)
     // trigger external INT1 in falling edge of INT1 (MCUCR.3,2 = 10)
     MCUCR |= 0x0A;
     GICR = 0b10000000;
        
	// D.1 output for TXD, D.0 input for RXD
	DDRD = 0b00000010;
     
     // B.7 output SCK, B.6 input MISO, B.5 output MOSI, B.3 output for parallel interrupt, B.2 is CS for SD
	DDRB = 0b10111110;
	
	DDRC = 0x00; //Port C is the paralell input port
	
	// initialize CS high
	PORTB.2 = 1;
	
	p_ready = 0;

	while (result != 0) result = SD_Reset();  // reset the SD card

     #asm("sei")

end