ad9851.c

ad9851应用

#include<AD9851.h>
#include<intrins.h>
//并行模式发送

void AD9851_Init()
{
	
	RESET=0;
	RESET=1; 			//AD9851复位，默认为并行模式
	delay_nms(1);
	RESET=0;

//	P1=0x03;			//Parallel to Serial 
	W_CLK=0;
	W_CLK=1;

	FQ_UD=0;
	FQ_UD=1;			//Serial mode Start
	FQ_UD=0; 
}


void Parallel_mode(unsigned long feq,unsigned char phase)
{
	unsigned char tmp,i=0;
	phase&=0xF8;
	
	P1=phase;
 	W_CLK=0;
	W_CLK=1;
	for(i=0;i<4;i++)
	{
		tmp=feq&0x000000FF;
		feq>>=8;
		P1=tmp;
	 	W_CLK=0;
		W_CLK=1;
	}

	FQ_UD=0;
	_nop_();
	FQ_UD=1;
	FQ_UD=0;
	delay_nus(1);
}

//串行模式发送
void Serial_mode(unsigned long feq,unsigned char phase)
{
	unsigned char i;
	phase&=0xF8;
	for(i=0;i<32;i++)
	{
		feq>>=1;
		AD9851_DATA=CY;
		W_CLK=0;
		W_CLK=1;
	}
	for(i=0;i<8;i++)
	{
		phase>>=1;
		AD9851_DATA=CY;
		W_CLK=0;
		W_CLK=1;
	}
		
	FQ_UD=0;
	FQ_UD=1;
	FQ_UD=0;
}

void delay_nms(unsigned int n)
{
	unsigned int i,j;
	for(i=0;i<n;i++)
	for(j=0;j<1900;j++);
}
void delay_nus(unsigned int n)
{
	unsigned int i,j;
	for(i=0;i<n;i++)
	for(j=0;j<=1;j++);
}