ad9850.h

这个是相当不错的EDA编程

/*----------------------------------------------
  heat file name  ad9850.h
  dds chip is  ad8950
----------------------------------------------*/ 



// ad9850 init
void AD9850_init(void)
{
   Set_DDSRST; 
   Clr_DDSRST;
 }
/*   dds_freq()*/
void DDS_Freq(unsigned char Fq_Word[5])
{
    char i ;
    unsigned char Mid_Value,Mid_Value1 ;               
    Clr_FQ_UD ;
    for(i=0;i<5;i++)
     {   
     	
     	//线路板上DDSD3和DDSD4画反了，所以 //rpdatf4 >> rpdatf3  //rpdatf3 >> rpdatf4
        
        /*
         	    	  
        Mid_Value = Fq_Word[i] ;
	Mid_Value1 = Fq_Word[i] ;
	Mid_Value &= 0x08 ;
     	if ( Mid_Value )                    bitset(Fq_Word[i],4);
     	 else                               bitclr(Fq_Word[i],4);
     	 Mid_Value1 &= 0x10 ;
     	if (Mid_Value1 )                     bitset(Fq_Word[i],3);
     	 else                               bitclr(Fq_Word[i],3); 
     	*/
        rPDATF = Fq_Word[i] ;
        
        Set_W_CLK     ;
        Clr_W_CLK     ;
     }
    Set_FQ_UD  ;
}
/*------------------------------------------  
    Fq_change()   
    Fq_Value * 214 = to 9850 freq_Word 
-------------------------------------------*/
void Freq_Change(unsigned long Fq_Value)
{
    unsigned char Fq_Word[5];
    char  i ;
    unsigned char Mid_Value,Mid_Value1 ;               
 /*
    unsigned long Mid ;
    float  Mid_Val ;
    Mid_Val = Fq_Value / 1000000 ;
    Mid = Mid_Val * 4294967295 ;
    Mid_Val = Mid/20 ;    
    Fq_Value = Mid_Val * 1000000 ;
 */

     Fq_Value = Fq_Value * 214 ;

       Fq_Word[0] = 0 ;
       /*
       Fq_Word[1] = (Fq_Value & 0xff000000)>>24 ;
       Fq_Word[2] = (Fq_Value & 0x00ff0000)>>16 ;
       Fq_Word[3] = (Fq_Value & 0x0000ff00)>>8 ; 
       Fq_Word[4] = (Fq_Value & 0x000000ff) ; 
       */
       Fq_Word[1] = 0x06 ;       
       Fq_Word[2] = 0x60 ;
       Fq_Word[3] = 0xB0 ;
       Fq_Word[4] = 0xC0 ;
       

        
       
       //CC16180  1MHZ
       //660B0C0  0.5MHZ
       
       
       
       DDS_Freq(Fq_Word);                
}


/*
100 0101 1100 1100 0010 1010 0000
100 | 0101 1100 | 1100 1010  | 1111 1100   342.01khz
110 | 0110 0000 | 1011 0000  | 1100 0000   500.00khz
110 | 0110 0000 | 1010 1000  | 1100 0000   
*/