ad9851.c

单片机实现DDS 利用单片机和AD9851来产生高频率的正弦波 本程序为一个测试程序,只产生一个频率不便的正弦波

#include <reg52.h>
#define uchar  unsigned char  
sbit w1bclk=P2^2;
sbit w8bclk=P2^3;
sbit key_1=P3^2;
sbit key_2=P3^3;
sbit key_3=P3^4;
sbit key_4=P3^5;
sbit FLAG=P2^7;
uchar p=0;
uchar i=0;


uchar  ctlword[8][5]=     { {0x04,0x0e,0x38,0xe3,0x8e},
                            {0x08,0x00,0x38,0xe3,0x8e},
							{0x1c,0x00,0x00,0xe3,0x8e},
							{0x29,0x00,0x00,0xa8,0x8e},
                            {0x05,0x00,0x00,0x11,0x8e},
                            {0x00,0x00,0x00,0x04,0x8e},
                            {0x0c,0x00,0x00,0x01,0x8e},
                            {0x08,0x00,0x00,0x00,0x8e},
                            };


void write_word(void);


void time_again(int t)
 { 
   int i;
   while(t--)
     for(i=0;i<100;i++)
	        {;;;;}
}



 void key_function(void)
   {
    
	if((P3&0x3c)!=0x3c)
    	{ 
	     time_again(40);
	       if(key_1==0)
           {
            p=0; 
			write_word();
            }
	       if(key_2==0)
	       {
		     p=1;
  			 write_word();  
			}
	       if(key_3==0)
            {
			  
            p=2;
  		    write_word();
	        }
           if(key_4==0)
            {
              if(p!=7)
              {p++;   
 			  write_word();}
               else {write_word();p=0;}
                 
             }
	     FLAG=~FLAG;
          }

   while((P3&0x3c)!=0x3c);
     
     }
   
void write_word(void)
{
 w8bclk=0;
 w1bclk=0;
 for(i=0;i<5;i++)
  {
    P0=ctlword[p][i];
	w1bclk=1;;;
	w1bclk=0;
  }
 w8bclk=1;;;;;;
 //w8bclk=0;
 i=0;
}


int main(void)
{
 
 
 w8bclk=0;
 w1bclk=0;
 for(i=0;i<5;i++)
  {
    P0=ctlword[p][i];
	w1bclk=1;;;
	w1bclk=0;
  }
 w8bclk=1;;;;;;
 //w8bclk=0;
 i=0;

 while(1){
  key_function();
 }
}