AD9854產(chǎn)生頻率程序

  /*-----------------------------------------------
  名稱(chēng)：AD9854并口驅(qū)動(dòng)
  編寫(xiě)：
  日期：2014.3
  修改：無(wú)
  內(nèi)容：
------------------------------------------------*/
#include "AD9854_Parallel.h"
        //uchar Freq1Word[6] = {0x01, 0x00, 0x00, 0x00, 0x00, 0x00};
        void Init_9854(void)  //INIT 9854
{// uint i;

WRB = 0;  
UDCLK = 0;
// FSK_D = 0;
RESET = 1;
RESET = 0;

//1.先寫(xiě)控制字
//Bit5-Bit7為任意；Bit4為比較器PD；Bit3保留.一般為低；Bit2為QDAC的PD(Power-down)；Bit1為DAC的PD；Bit0為DIG PD
Write_9854(0x1d,0x00);//10
//Bit7為任意；Bit6為PLL range；Bit5為旁路PLL；bit4-bit0為倍頻數(shù)////30晶振*10＝300MHz系統(tǒng)
Write_9854(0x1e,0x4a);
//bit7為清零ACC1；bit6為清零ACC2（一般必須為低）；bit5為三角掃頻；bit4為外用QDAC；bit3-bit1為模式選擇；bit0為使用內(nèi)/外更新時(shí)鐘
Write_9854(0x1f,0x00);
//Bit7為任意；bit6為旁路反正弦；bit5為OSK使能（默認(rèn)為1，單頻模式下無(wú)輸出）；bit4為OSK INT；bit3-2為任意；bit1為設(shè)置串行模式下低位先傳；bit0為設(shè)置串行模式下SDO可用
Write_9854(0x20,0x60);//0x20,0x00
        //2.寫(xiě)頻率
Write_frequence(Frequence);
//3.寫(xiě)幅度
Write_Amplitude(0,Amplitude[0]);
Write_Amplitude(1,Amplitude[1]);

// UDCLK = 1;
// UDCLK = 0;
}
        void Write_9854(unsigned char address,unsigned char DATA)
{
WRB = 1;
ADDR =  address;
PDATA = DATA;
WRB = 0;
}
        //==============更新頻率====================================
void Write_frequence(unsigned long x)
{
WRB = 0;  
UDCLK = 0;

Write_9854(0x08,0);
Write_9854(0x09,0);
x *= (429.4967296/Ref_Frequence); // 控制字 = 頻率(HZ) 2^48 /(2^16)/(300*10^6)
          Write_9854(0x07,(unsigned char)x);
  Write_9854(0x06,(unsigned char)(x>>8));
Write_9854(0x05,(unsigned char)(x>>16));
Write_9854(0x04,(unsigned char)(x>>24));

UDCLK = 1;
UDCLK = 0;
        }
//==============更新幅度====================================
void Write_Amplitude(bit Channel,unsigned int Ampli)
{  
WRB = 0;  
UDCLK = 0;

if(Channel)
  { Write_9854(0x23,(Ampli>>8));
   Write_9854(0x24,Ampli);
  }   
else
  { Write_9854(0x21,(Ampli>>8));
   Write_9854(0x22,Ampli);
  }
UDCLK = 1;
UDCLK = 0;
}

//函數(shù)名稱(chēng)：void AD9854_SetSine(ulong Freq,uint Shape)
//函數(shù)功能：AD9854正弦波產(chǎn)生程序
//入口參數(shù)：Freq   頻率設(shè)置，取值范圍0—（1/2）*SYSCLK
//          Shape  幅度設(shè)置，為12Bit,取值范圍為（0—4095），取值越大，幅度越大
//出口參數(shù)：無(wú)
//================================================================================================
void AD9854_SetSine(ulong Freq,uint Shape)
{
     uchar count;
  uchar Adress;
  Adress=0x04;              //選擇頻率控制字地址的處值
  Freq_convert(Freq);       //頻率轉(zhuǎn)換
  for(count=6;count>0;)     //寫(xiě)入6字節(jié)的頻率控制字
  {
      AD9854_WR_Byte(Adress++,FreqWord[--count]);
  }
  AD9854_WR_Byte(0x21,Shape>>8);     //設(shè)置I通道幅度
  AD9854_WR_Byte(0x22,(uchar)(Shape&0xff));
  AD9854_WR_Byte(0x23,Shape>>8);     //設(shè)置Q通道幅度
  AD9854_WR_Byte(0x24,(uchar)(Shape&0xff));
  AD9854_UDCLK=1;                    //更新AD9854輸出
  AD9854_UDCLK=0;
}
本文轉(zhuǎn)自：http://www.xiaovdiy.cn/?post=99