ad9851.c

89S51单片机并行驱动AD9851的程序

#ifndef __AD9851_H__
#define __AD9851_H__

#include "regx51.h"
					  

unsigned long f_freqword;
unsigned char f_phaseword;


#define RST_DDS	P2_5
#define CLK_DDS	P2_7
#define UPDATE	P2_6
#define Data_DDS P0


void InitDDSport()
{
	RST_DDS = 1;
	RST_DDS = 0;
	Data_DDS = 0;
	CLK_DDS = 0;
	UPDATE = 1;
}


void SendData()
{
	UPDATE=0;

	Data_DDS = f_phaseword;
	CLK_DDS=0;
	CLK_DDS=1;

	Data_DDS = f_freqword>>24;
	CLK_DDS = 0;
	CLK_DDS = 1;
	Data_DDS = (f_freqword>>16) & 0xFF;
	CLK_DDS = 0;
	CLK_DDS = 1;
	Data_DDS = (f_freqword>>8) & 0xFF;
	CLK_DDS = 0;
	CLK_DDS = 1;
	Data_DDS = f_freqword & 0xFF;
	CLK_DDS = 0;
	CLK_DDS = 1;

	UPDATE=1;
	UPDATE=0;
}

void SendFreq(double freq)
{
	f_freqword=(unsigned long)freq*26.5121438;
	SendData();
}

void SendPhase(unsigned char phase)
{
	f_phaseword = (phase<<3) | 1;
	SendData();
}


#endif