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標題: AD9854產生頻率程序 [打印本頁]

作者: xiaos 時間: 2015-4-1 22:47
標題: AD9854產生頻率程序
  /*-----------------------------------------------
  名稱：AD9854并口驅動
  編寫：
  日期：2014.3
  修改：無
  內容：
------------------------------------------------*/
#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////30晶振*10＝300MHz系統
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/外更新時鐘
Write_9854(0x1f,0x00);
//Bit7為任意；bit6為旁路反正弦；bit5為OSK使能（默認為1，單頻模式下無輸出）；bit4為OSK INT；bit3-2為任意；bit1為設置串行模式下低位先傳；bit0為設置串行模式下SDO可用
Write_9854(0x20,0x60);//0x20,0x00
//2.寫頻率
Write_frequence(Frequence);
//3.寫幅度
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;
}

//函數名稱：void AD9854_SetSine(ulong Freq,uint Shape)
//函數功能：AD9854正弦波產生程序
//入口參數：Freq 頻率設置，取值范圍0—（1/2）*SYSCLK
//       Shape  幅度設置，為12Bit,取值范圍為（0—4095），取值越大，幅度越大
//出口參數：無
//================================================================================================
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);    //頻率轉換
  for(count=6;count>0;)    //寫入6字節的頻率控制字
  {
   AD9854_WR_Byte(Adress++,FreqWord[--count]);
  }
  AD9854_WR_Byte(0x21,Shape>>8);    //設置I通道幅度
  AD9854_WR_Byte(0x22,(uchar)(Shape&0xff));
  AD9854_WR_Byte(0x23,Shape>>8);    //設置Q通道幅度
  AD9854_WR_Byte(0x24,(uchar)(Shape&0xff));
  AD9854_UDCLK=1;                   //更新AD9854輸出
  AD9854_UDCLK=0;
}
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