训练项目十三：基于dds芯片ad9851的信号源.c

长沙理工自己的实验程序

#include"iom128v.h"
#include"macros.h"

#define SetW_CLK  PORTC|=BIT(PC1)       
#define ClrW_CLK  PORTC&=~BIT(PC1)
#define SetFQ_UD  PORTC|=BIT(PC0)
#define ClrFQ_UD  PORTC&=~BIT(PC0)

void Delay (unsigned int uin)  
{
    int i;
	 
    for(i=0; i<uin; i++) {
	    ;
	}
}

void Delay_1ms (void)                 
{
    unsigned int i;
	
    for (i=0; i<2260; i++);
}

void Delay_nms (unsigned int uin)       
{
    unsigned int i=0;
   
    for (i=0;i<uin;i++){
        Delay_1ms();
	}
 }
 
void Delay_ms (unsigned int uin)  
{
    int i;
	 
    for(i=0;i<uin;i++){
        Delay_nms(1000);
    }
} 

void Init9851()
{
    DDRC|=0x03;
    DDRB|=0x01;
    PORTB=0xff;
	
    ClrW_CLK ;
    ClrFQ_UD;
    Delay(2);
	
    SetW_CLK ;
    Delay(2);
	
    ClrW_CLK ;
    Delay(5);
	
    SetFQ_UD ;
    Delay(2);
	
    ClrFQ_UD;
}

void WriteAD9851 (unsigned long int uldds)
{
    unsigned char i;
	
    ClrW_CLK ;
    ClrFQ_UD;
	
    for(i=0;i<40;i++){
        ClrW_CLK ;
	    if(uldds&0x000000001||i==32)
            PORTB|=0x01;
        else 
            PORTB&=0x00;
        SetW_CLK ;
        uldds=uldds>>1;
    }
    SetFQ_UD ;
    ClrW_CLK ;
    Delay(5);
    ClrFQ_UD;
}

void Write_freq (unsigned long int ulfreq)
{
    unsigned long uldds;
	
    uldds=ulfreq*29.82617;
    WriteAD9851(uldds);
}

void main()
{
    unsigned long i;
    i=100;
	
    Init9851 ();
    Write_freq (20000000);
}