DDS AD9959应用电路和配置源程序

DDS AD9959应用电路和配置源程序

AD9959是一款有四个DDS通道，最高达500M SPS的数字频率合成芯片。

        常用电路接法：

主要程序：

#include "config.h"

void delay(void)

{

 unsigned int i;

 for(i=0;i<10;i++);

}

/*****************************************************************************

功能描述: 加载寄存器，上升延有效

*****************************************************************************/

void run(void)

{

 CLR_IOUPDATE;

 CLR_IOUPDATE;

 CLR_IOUPDATE;

 CLR_IOUPDATE;

 CLR_IOUPDATE;

 CLR_IOUPDATE;

 CLR_IOUPDATE;

 SET_IOUPDATE;

 SET_IOUPDATE;   

}

/*****************************************************************************

函数名: write_a_byte

功能描述: 通过串口写一个字节，MSB first，上升延有效

*****************************************************************************/

void write_a_byte(uint8 w_data)

{

 uint8 i;    

 for(i=0;i<8;i++)

  {

   if(w_data & 0x80)

   {

    SET_SDIO0;

   }

   else

   {

    CLR_SDIO0;

   }

   w_data <<= 1;

   SET_DDSSCLK;

   CLR_DDSSCLK;

  }

}

/*****************************************************************************

函数名: write_CSR

功能描述: 写CSR寄存器：

*****************************************************************************/

void write_CSR(uint8 w_data)

{

 CLR_SDIO3;

 CLR_DDSCS;

 write_a_byte(0x00);    //write address 0.  CSR's address is 0.

 write_a_byte(w_data);

 SET_DDSCS;

 SET_SDIO3;

}

void write_FR1(uint8 w_data1,uint8 w_data2,uint8 w_data3)

{

 CLR_SDIO3;

 CLR_DDSCS;

 write_a_byte(0x01);    //write address 1.  FR1's address is 0x01

 write_a_byte(w_data1);

 write_a_byte(w_data2);

 write_a_byte(w_data3);

 SET_DDSCS;

 SET_SDIO3;

}

void write_FR2(uint8 w_data1,uint8 w_data2)

{

 CLR_SDIO3;

 CLR_DDSCS;

 write_a_byte(0x02);    //write address 2

 write_a_byte(w_data1);

 write_a_byte(w_data2);

 SET_DDSCS;

 SET_SDIO3;

}

void write_CFR(uint8 w_data1,uint8 w_data2,uint8 w_data3)

{

 CLR_SDIO3;

 CLR_DDSCS;

 write_a_byte(0x03);

 write_a_byte(w_data1);

 write_a_byte(w_data2);

 write_a_byte(w_data3);

 SET_DDSCS;

 SET_SDIO3;

}

void write_CTW0(uint32 F_word)  //Channel Frequency Tuning Word  (CTW0)

{

 CLR_SDIO3;

 CLR_DDSCS;

 write_a_byte(0x04);

 write_a_byte(((unsigned char *)(&F_word))[3]);

 write_a_byte(((unsigned char *)(&F_word))[2]);

 write_a_byte(((unsigned char *)(&F_word))[1]);

 write_a_byte(((unsigned char *)(&F_word))[0]);

 SET_DDSCS;

 SET_SDIO3;

}

void write_CPW0(uint16 P_word)                  //Channel Phase1 Offset Word (CPW0) (0x05)

{

 CLR_SDIO3;

 CLR_DDSCS;

 write_a_byte(0x05);

 write_a_byte(((unsigned char *)(&P_word))[1]&0x3F);

 write_a_byte((((unsigned char *)(&P_word))[0]));

 SET_DDSCS;

 SET_SDIO3;

}

void write_ACR(uint32 A_word)

{

 CLR_SDIO3;

 CLR_DDSCS;

 write_a_byte(0x06);

 write_a_byte(((unsigned char *)(&A_word))[3]);

 write_a_byte(((unsigned char *)(&A_word))[2]);

 write_a_byte(((unsigned char *)(&A_word))[1]);

 SET_DDSCS;

 SET_SDIO3;

}

void write_LSR(uint8 rising,uint8 falling)

{

 CLR_SDIO3;

 CLR_DDSCS;

 write_a_byte(0x07);

 write_a_byte(rising);

 write_a_byte(falling);

 SET_DDSCS;

 SET_SDIO3;

}

void write_RDW(uint32 rising)

{

 CLR_SDIO3;

 CLR_DDSCS;

 write_a_byte(0x08);

 write_a_byte(((unsigned char *)(&rising))[3]);

 write_a_byte(((unsigned char *)(&rising))[2]);

 write_a_byte(((unsigned char *)(&rising))[1]);

 write_a_byte(((unsigned char *)(&rising))[0]);

 SET_DDSCS;

 SET_SDIO3;

}

void write_FDW(uint32 falling)

{

 CLR_SDIO3;

 CLR_DDSCS;

 write_a_byte(0x09);

 write_a_byte(((unsigned char *)(&falling))[3]);

 write_a_byte(((unsigned char *)(&falling))[2]);

 write_a_byte(((unsigned char *)(&falling))[1]);

 write_a_byte(((unsigned char *)(&falling))[0]);

 SET_DDSCS;

 SET_SDIO3;

}

void write_CTWn(uint8 n,uint32 w_data)

{

 CLR_SDIO3;

 CLR_DDSCS;

 write_a_byte(n+0x09);   //CTWn's address is n+0x09.n>=1 and n<=15.

 write_a_byte(((unsigned char *)(&w_data))[3]);

 write_a_byte(((unsigned char *)(&w_data))[2]);

 write_a_byte(((unsigned char *)(&w_data))[1]);

 write_a_byte(((unsigned char *)(&w_data))[0]);

 SET_DDSCS;

 SET_SDIO3;

}

#define PLL_DIV 5

#define systemp_frequency (22.1184*1000000*PLL_DIV)

void set_frequency(uint32 f)

{

 unsigned long int temp;

 temp=(unsigned long int)f*(0xFFFFFFFF/(float)systemp_frequency+1.0/systemp_frequency);

 write_CTW0(temp);

}

uint32 change(uint32 f)

{

 unsigned long int temp;

 temp=(unsigned long int)f*(0xFFFFFFFF/(float)systemp_frequency+1.0/systemp_frequency);

 return temp;

}

void AD9959_init(void)

{

 uint16 i;

 DDS_DDR = 0xff;

 CLR_DDSRESET;

 for(i=0;i<10000;i++);

 SET_DDSCS;

 CLR_DDSSCLK;

 SET_SDIO3;

 SET_DDSRESET;

 for(i=0;i<10000;i++);

 CLR_DDSRESET;

 for(i=0;i<100;i++);

}