AD9854产生频率程序

/*-----------------------------------------------
  名称：AD9854并口驱动
  编写：
  日期：2014.3
  修改：无
  内容：
------------------------------------------------*/
#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.先写控制字
//Bit5-Bit7为任意；Bit4为比较器PD；Bit3保留.一般为低；Bit2为QDAC的PD(Power-down)；Bit1为DAC的PD；Bit0为DIG PD
 Write_9854(0x1d,0x00);//10
//Bit7为任意；Bit6为PLL range；Bit5为旁路PLL；bit4-bit0为倍频数////30晶振*10＝300MHz系统
 Write_9854(0x1e,0x4a);
//bit7为清零ACC1；bit6为清零ACC2（一般必须为低）；bit5为三角扫频；bit4为外用QDAC；bit3-bit1为模式选择；bit0为使用内/外更新时钟
 Write_9854(0x1f,0x00);
//Bit7为任意；bit6为旁路反正弦；bit5为OSK使能（默认为1，单频模式下无输出）；bit4为OSK INT；bit3-2为任意；bit1为设置串行模式下低位先传；bit0为设置串行模式下SDO可用
 Write_9854(0x20,0x60);//0x20,0x00

//2.写频率
 Write_frequence(Frequence);
//3.写幅度
 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;
}

//==============更新频率====================================
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 = 频率(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;
}

//函数名称：void AD9854_SetSine(ulong Freq,uint Shape)

//函数功能：AD9854正弦波产生程序

//入口参数：Freq   频率设置，取值范围0—（1/2）*SYSCLK

//          Shape  幅度设置，为12Bit,取值范围为（0—4095），取值越大，幅度越大

//出口参数：无

//================================================================================================

void AD9854_SetSine(ulong Freq,uint Shape)

{

     uchar count;

  uchar Adress;

  Adress=0x04;              //选择频率控制字地址的处值

  Freq_convert(Freq);       //频率转换

  for(count=6;count>0;)     //写入6字节的频率控制字

  {

      AD9854_WR_Byte(Adress++,FreqWord[--count]);

  }

  AD9854_WR_Byte(0x21,Shape>>8);     //设置I通道幅度

  AD9854_WR_Byte(0x22,(uchar)(Shape&0xff));

  AD9854_WR_Byte(0x23,Shape>>8);     //设置Q通道幅度

  AD9854_WR_Byte(0x24,(uchar)(Shape&0xff));

  AD9854_UDCLK=1;                    //更新AD9854输出

  AD9854_UDCLK=0;

}