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<TD noWrap width="10%">软件名称</TD>
<TD background="" colSpan=2><B>DDS AD9959应用电路和配置源程序</B></TD></TR>
<TR>
<TD noWrap width="10%" bgColor=#ffffff>运行环境</TD>
<TD width="44%" bgColor=#ffffff>Win9X/Win2000/WinXP/Win2003/</TD>
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<TD width="10%" bgColor=#f8f8f8>整理时间</TD>
<TD bgColor=#f8f8f8>2008-3-12 17:33:23</TD></TR>
<TR>
<TD width="10%" bgColor=#ffffff>软件星级</TD>
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<TD bgColor=#ffffff>软件大小</TD>
<TD bgColor=#ffffff>333 KB</TD></TR>
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<TD width="10%" bgColor=#ffffff>相关连接 </TD>
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软件简介</TD></TR>
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<P><FONT face=Verdana>DDS AD9959应用电路和配置源程序</FONT></P>
<P>AD9959是一款有四个DDS通道，最高达500M SPS的数字频率合成芯片。</P>
<P> 常用电路接法：</P>
<P><IMG
src="DDS AD9959应用电路和配置源程序-电子电路图,电子技术资料网站.files/20083121732826249.jpg"
border=0></P>
<P>主要程序：</P>
<P>#include "config.h"<BR>void
delay(void)<BR>{<BR> unsigned int
i;<BR> for(i=0;i<10;i++);<BR>}</P>
<P>/*****************************************************************************<BR><BR>功能描述: 加载寄存器，上升延有效<BR><BR><BR><BR>*****************************************************************************/
<BR>void
run(void)<BR>{<BR> CLR_IOUPDATE;<BR> CLR_IOUPDATE;<BR> CLR_IOUPDATE;<BR> CLR_IOUPDATE;<BR> CLR_IOUPDATE;<BR> CLR_IOUPDATE;<BR> CLR_IOUPDATE;<BR> <BR> <BR> SET_IOUPDATE;<BR> SET_IOUPDATE;
<BR>}</P>
<P>/*****************************************************************************<BR>函数名: write_a_byte<BR><BR>功能描述: 通过串口写一个字节，MSB
first，上升延有效<BR><BR><BR><BR>*****************************************************************************/
<BR>void write_a_byte(uint8 w_data)<BR>{<BR> uint8
i;
<BR> for(i=0;i<8;i++)<BR> {<BR>
if(w_data & 0x80)<BR>
{<BR> SET_SDIO0;<BR>
}<BR> else<BR>
{<BR> CLR_SDIO0;<BR>
}<BR> w_data <<= 1;<BR>
SET_DDSSCLK;<BR> CLR_DDSSCLK;<BR>
}<BR>}</P>
<P>/*****************************************************************************<BR>函数名: write_CSR<BR><BR>功能描述: 写CSR寄存器：<BR><BR>*****************************************************************************/
<BR>void write_CSR(uint8
w_data)<BR>{<BR> CLR_SDIO3;<BR> CLR_DDSCS;<BR> write_a_byte(0x00);
//write address 0. CSR's address is
0.<BR> write_a_byte(w_data);<BR> SET_DDSCS;<BR> SET_SDIO3;<BR>}</P>
<P><BR>void write_FR1(uint8 w_data1,uint8 w_data2,uint8
w_data3)<BR>{<BR> CLR_SDIO3;<BR> CLR_DDSCS;<BR> <BR> write_a_byte(0x01);
//write address 1. FR1's address is
0x01<BR> write_a_byte(w_data1);<BR> write_a_byte(w_data2);<BR> write_a_byte(w_data3);<BR> <BR> SET_DDSCS;<BR> SET_SDIO3;<BR>}</P>
<P><BR>void write_FR2(uint8 w_data1,uint8
w_data2)<BR>{<BR> CLR_SDIO3;<BR> CLR_DDSCS;<BR> <BR> write_a_byte(0x02);
//write address
2<BR> write_a_byte(w_data1);<BR> write_a_byte(w_data2);<BR> <BR> SET_DDSCS;<BR> SET_SDIO3;<BR>}</P>
<P>void write_CFR(uint8 w_data1,uint8 w_data2,uint8
w_data3)<BR>{<BR> CLR_SDIO3;<BR> CLR_DDSCS;<BR> <BR> write_a_byte(0x03);<BR> write_a_byte(w_data1);<BR> write_a_byte(w_data2);<BR> write_a_byte(w_data3);<BR> <BR> SET_DDSCS;<BR> SET_SDIO3;<BR>}</P>
<P>void write_CTW0(uint32 F_word) //Channel Frequency
Tuning Word
(CTW0)<BR>{<BR> CLR_SDIO3;<BR> CLR_DDSCS;<BR> <BR> write_a_byte(0x04);<BR> write_a_byte(((unsigned
char *)(&F_word))[3]);<BR> write_a_byte(((unsigned
char *)(&F_word))[2]);<BR> write_a_byte(((unsigned
char *)(&F_word))[1]);<BR> write_a_byte(((unsigned
char
*)(&F_word))[0]);<BR> <BR> SET_DDSCS;<BR> SET_SDIO3;<BR>}</P>
<P>void write_CPW0(uint16
P_word)
//Channel Phase1 Offset Word (CPW0)
(0x05)<BR>{<BR> CLR_SDIO3;<BR> CLR_DDSCS;<BR> <BR> write_a_byte(0x05);<BR> write_a_byte(((unsigned
char
*)(&P_word))[1]&0x3F);<BR> write_a_byte((((unsigned
char
*)(&P_word))[0]));<BR> <BR> SET_DDSCS;<BR> SET_SDIO3;<BR>}</P>
<P>void write_ACR(uint32
A_word)<BR>{<BR> CLR_SDIO3;<BR> CLR_DDSCS;<BR> write_a_byte(0x06);<BR> <BR> write_a_byte(((unsigned
char *)(&A_word))[3]);<BR> write_a_byte(((unsigned
char *)(&A_word))[2]);<BR> write_a_byte(((unsigned
char
*)(&A_word))[1]);<BR> <BR> SET_DDSCS;<BR> SET_SDIO3;<BR>}</P>
<P>void write_LSR(uint8 rising,uint8
falling)<BR>{<BR> CLR_SDIO3;<BR> CLR_DDSCS;<BR> <BR> write_a_byte(0x07);<BR> write_a_byte(rising);<BR> write_a_byte(falling);<BR> <BR> SET_DDSCS;<BR> SET_SDIO3;<BR>}</P>
<P>void write_RDW(uint32
rising)<BR>{<BR> CLR_SDIO3;<BR> CLR_DDSCS;<BR> <BR> write_a_byte(0x08);<BR> write_a_byte(((unsigned
char *)(&rising))[3]);<BR> write_a_byte(((unsigned
char *)(&rising))[2]);<BR> write_a_byte(((unsigned
char *)(&rising))[1]);<BR> write_a_byte(((unsigned
char
*)(&rising))[0]);<BR> <BR> SET_DDSCS;<BR> SET_SDIO3;<BR>}</P>
<P>void write_FDW(uint32
falling)<BR>{<BR> CLR_SDIO3;<BR> CLR_DDSCS;<BR> <BR> write_a_byte(0x09);<BR> write_a_byte(((unsigned
char *)(&falling))[3]);<BR> write_a_byte(((unsigned
char *)(&falling))[2]);<BR> write_a_byte(((unsigned
char *)(&falling))[1]);<BR> write_a_byte(((unsigned
char
*)(&falling))[0]);<BR> <BR> SET_DDSCS;<BR> SET_SDIO3;<BR>}</P>
<P>void write_CTWn(uint8 n,uint32
w_data)<BR>{<BR> CLR_SDIO3;<BR> CLR_DDSCS;<BR> <BR> write_a_byte(n+0x09);
//CTWn's address is n+0x09.n>=1 and
n<=15.<BR> write_a_byte(((unsigned char
*)(&w_data))[3]);<BR> write_a_byte(((unsigned char
*)(&w_data))[2]);<BR> write_a_byte(((unsigned char
*)(&w_data))[1]);<BR> write_a_byte(((unsigned char
*)(&w_data))[0]);<BR> <BR> SET_DDSCS;<BR> SET_SDIO3;<BR>}</P>
<P>#define PLL_DIV 5<BR>#define systemp_frequency
(22.1184*1000000*PLL_DIV)</P>
<P>void set_frequency(uint32 f)<BR>{<BR> unsigned long
int temp;<BR> temp=(unsigned long
int)f*(0xFFFFFFFF/(float)systemp_frequency+1.0/systemp_frequency);<BR> write_CTW0(temp);<BR>}</P>
<P><BR>uint32 change(uint32 f)<BR>{<BR> unsigned long
int temp;<BR> temp=(unsigned long
int)f*(0xFFFFFFFF/(float)systemp_frequency+1.0/systemp_frequency);<BR> return
temp;<BR>}</P>
<P>void AD9959_init(void)<BR>{<BR> uint16
i;<BR> DDS_DDR =
0xff;<BR> CLR_DDSRESET;<BR> for(i=0;i<10000;i++);<BR> <BR> SET_DDSCS;<BR> CLR_DDSSCLK;<BR> SET_SDIO3;<BR> SET_DDSRESET;<BR> <BR> for(i=0;i<10000;i++);<BR> <BR> CLR_DDSRESET;<BR> for(i=0;i<100;i++);<BR>}</P>
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