#include <iom16v.h>
#include <macros.h>
#define  uchar unsigned char
#define  uint  unsigned int
#include "Skey.c"
void spi_init()
{
     DDRB|=0XA0;
	 DDRA|=BIT(PA1);
	 SPCR=0X57;
}
void ad5300(uchar daword)
{
    uchar temp1=0,temp2=0,status;
    temp1|=daword<<4;//1101 1001
    temp2|=daword>>4;
	
	PORTA&=~BIT(PA1);
	SPSR=0;
	SPDR=temp2;
    do
	{
	  status=SPSR;
	}while(!(status&=0X80));
	
	delay(10);
	SPSR=0;
	SPDR=temp1;
	do
	{
	  status=SPSR;
	}while(!(status&=0X80));
	SPSR=0;
	delay(10);
	PORTA|=BIT(PA1);
} 
void main()
{
    uchar i,data=128;
    DDRB=0XFF;
	spi_init();
	ad5300(0);
	ad5300(data);
	
	while(1)
	{
	   if(key_press())
	   {
	      i=key_scan();
		  switch(i)
		  {
		    case 0:
			  data=data+16;
			  break;
			case 1:
			  data=data-16;
			  break;
			case 2:
			  data=0;
			  break;
			 case 3:
			  data=255;
			  break;      
		  }
		  ad5300(data);
	   }
	}
}