06_7_12_23_45_main.c

用51单片机控制AD9851产生正弦信号的源程序

/*
*Author hejun
*Date   2006_7_12 
*/

/*SystemClock=180MHz*/
//F_out=10MHz 	FrqDWord=238609294;	W1=0x0e; W2=0x38; W3=0xe3; W4=0x83;//(W1=Freq–b31__Freq–b3Freq–b24)
//F_out=1MHz 	FrqDWord=23860929;	W1=0x01; W2=0x6c; W3=0x16; W4=0xc1;//(W1=Freq–b31__Freq–b3Freq–b24)
//F_out=100kHz 	FrqDWord=2386093;	W1=0x00; W2=0x24; W3=0x68; W4=0xad;//(W1=Freq–b31__Freq–b3Freq–b24)
//F_out=10kHz 	FrqDWord=238609;	W1=0x00; W2=0x03; W3=0xa4; W4=0x11;//(W1=Freq–b31__Freq–b3Freq–b24)
//F_out=1kHz 	FrqDWord=23861; 	W1=0x00; W2=0x00; W3=0x5d; W4=0x35;//(W1=Freq–b31__Freq–b3Freq–b24)
//F_out=100Hz 	FrqDWord=2386; 		W1=0x00; W2=0x00; W3=0x09; W4=0x52;//(W1=Freq–b31__Freq–b3Freq–b24)
#include <at89X52.h>
#define uchar unsigned char
#define uint unsigned int
#define RESET  P1_0
#define W_CLK  P1_1
#define FQ_UD  P1_2
#define DDSData		P2 
#define CLR_WCLK()   W_CLK = 0
#define CLR_FQUD()   FQ_UD = 0
#define CLR_RESET()  RESET = 0
#define SET_WCLK()   W_CLK = 1
#define SET_FQUD()   FQ_UD = 1
#define SET_RESET()  RESET = 1
/*声明全局变量*/
unsigned long FrqDWord;   		//32-bit frequency tuning word
unsigned long Step;   			//步进
unsigned char W0,W1,W2,W3,W4;   	//
/*声明子程序*/
void F_Init_ParallelMode();     //初始化DDS
void F_ParallelLoad_AD9851();   //并行置数
void F_S2P_AD9851();            //串行数据向并行数据转换
void delay();
/*定义子程序*/
void F_Init_ParallelMode()
{ 
    CLR_RESET();
    delay();
    SET_RESET();
    delay();
    delay();
    delay();
    delay();
    delay();
    CLR_RESET();   //AD9851复位   
}

void F_S2P_AD9851()
{  
    unsigned long frqTmp;
    frqTmp = FrqDWord;
    
    W4 = frqTmp;
    W4 &= ~0xff00;
    frqTmp >>= 8;
    
    W3 = frqTmp;
    W3 &= ~0xff00;
    frqTmp >>= 8;
    
    W2 = frqTmp;
    W2 &= ~0xff00;
    frqTmp >>= 8;
    
    W1 = frqTmp;
}
void F_ParallelLoad_AD9851()
{
    F_S2P_AD9851();
    
    CLR_WCLK(); 
    CLR_FQUD();
    
    CLR_WCLK();           //Load W1 to shifting register
    DDSData= W0;
    delay();
    SET_WCLK();
    delay();
    
    CLR_WCLK();          //Load W1 to shifting register
    DDSData= W1;
    delay();	
    SET_WCLK();
    delay();
    
    CLR_WCLK();  	 //Load W2 to shifting register
    DDSData= W2;
    delay();
    SET_WCLK();
    delay();
    
    CLR_WCLK();		 //Load W3 to shifting register
    DDSData= W3;
    delay();
    SET_WCLK();
    delay();
    
    CLR_WCLK();		 //Load W4 to shifting register
    DDSData= W4;
    delay();
    SET_WCLK();
    delay();
    
    CLR_WCLK();
    delay();
    delay();
    delay();
    SET_FQUD();
    delay();
    delay();
    delay();
    delay();
    delay();
    delay();
    CLR_FQUD();   //锁存频率相位值
}

void delay()
{
	unsigned char i;
	for (i=1;i<=0xff;i++);

}

/*主函数*/
void main()
{
	
	W0 = 0x01;				//6′ REFCLK Multiplier Enable
    	FrqDWord = 23861;		        //set initial F_out=10Mhz
	F_Init_ParallelMode();
	F_ParallelLoad_AD9851();
        for(;;)

}