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      <H2>AD9850 DDS控制子程序</H2>
      <DIV class=t_msgfont 
      id=postmessage_22>经常做其他的单片机实验,还没做过DDS的实验。最近打算写个程序试验一下。<BR><BR>看了N久datasheet和别人的例子,就开始写程序了。可到了控制字的计算,发现还真是麻烦。由于我是用C写程序,所以一开始定义了long型变量,让它算,几行代码就解决了。不过一想,单片机这样算也太慢了吧,要是一转编码器,频率变化几十次上百次,单片机还不累死了<BR><BR>于是想换个查表方式吧。搞了一上午,把算法搞好,表也算好做出来了,一编译,晕!长出了好几百字节(这其中包括表本身约200字节,再加上算法中多句的加法代码),看来2051里面别想放了。 
      <BR><BR>看来,鱼和熊掌,不可兼得。要速度,代码量就大。要代码精简,速度就慢。这大概就是单片机的真谛吧。<BR><BR>我的查表算法思路是这样的<BR>:<BR>1、构造N个二维数组(N=你需要输入的最大频率值位数,例如你需要精确到10HZ,最高30MHZ,那么就有10M位、1M位、100K位、10K位、1K位、100HZ位、10HZ位,共7位,所以N=7)。<BR>2、根据你所用的芯片型号,和晶振频率,计算出每个频率位0-9时的控制字。<BR>3、使用时,把你频率的每一位控制字,查表读出,并相加(特别需要注意进位也需要处理)。<BR>4、把加出的4字节控制字,送DDS。<BR><BR>此方法,理论最大控制字误差为N。一般9851或9850DDS,常用的晶振频率值条件下,此误差实际表现在频率上时,小于1HZ的1到2个数量级。<BR><BR>查表部分具体程序(尚未进行硬件测试)<BR><BR>程序代码<BR><BR><BR>/*******************************************<BR>&nbsp; 
      &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;AD9850 
      DDS控制子程序<BR>********************************************<BR>编写:BG4UVR<BR>描述:&nbsp; 
      &nbsp; MCS51单片机控制AD9850/AD9851子程序。<BR>&nbsp; &nbsp;&nbsp; 
      &nbsp;&nbsp;&nbsp;提供如下5个常用DDS控制函数。例子中<BR>&nbsp; &nbsp;&nbsp; 
      &nbsp;&nbsp;&nbsp;DDS控制字表的DDS型号为AD9850,晶振<BR>&nbsp; &nbsp;&nbsp; 
      &nbsp;&nbsp;&nbsp;为16MHZ。<BR>注意:&nbsp; &nbsp; 
      使用前请修改程序内相应硬件端口<BR>********************************************/<BR>void 
      dds_reset(void);&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;//DDS主复位程序<BR>void 
      dds_serialmode(void);&nbsp; &nbsp; //DDS串行方式设置<BR>void 
      dds_set(void);&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; 
      &nbsp;//DDS设置数据发送<BR>void fre2word(void);&nbsp; &nbsp;&nbsp; 
      &nbsp;&nbsp;&nbsp;//DDS控制字计算<BR>void freupdata(void);&nbsp; &nbsp;&nbsp; 
      &nbsp;&nbsp;&nbsp;//DDS频率输出更新<BR>/*******************************************/<BR><BR>//其他函数此处省略,只留下了表的结构和控制字计算部分……<BR><BR>/********************************************/<BR>//控制字表,DDS=9850,晶振=16MHZ<BR>&nbsp; 
      &nbsp; 
      //word=0x100000000*fre/16000000;<BR>/********************************************/<BR>unsigned 
      char code dds_word_10mhz[2][4]={<BR>&nbsp; &nbsp; 
      0x00,0x00,0x00,0x00,<BR>&nbsp; &nbsp; 
      0x00,0x00,0x00,0xa0<BR>};<BR><BR>unsigned char code 
      dds_word_1mhz[10][4]={<BR>&nbsp; &nbsp; 0x00,0x00,0x00,0x00,<BR>&nbsp; 
      &nbsp; 0x00,0x00,0x00,0x10,<BR>&nbsp; &nbsp; 
      0x00,0x00,0x00,0x20,<BR>&nbsp; &nbsp; 0x00,0x00,0x00,0x30,<BR>&nbsp; 
      &nbsp; 0x00,0x00,0x00,0x40,<BR>&nbsp; &nbsp; 
      0x00,0x00,0x00,0x50,<BR>&nbsp; &nbsp; 0x00,0x00,0x00,0x60,<BR>&nbsp; 
      &nbsp; 0x00,0x00,0x00,0x70,<BR>&nbsp; &nbsp; 
      0x00,0x00,0x00,0x80,<BR>&nbsp; &nbsp; 
      0x00,0x00,0x00,0x90<BR>};<BR>unsigned char code 
      dds_word_100khz[10][4]={<BR>&nbsp; &nbsp; 0x00,0x00,0x00,0x00,&nbsp; 
      &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;//0<BR>&nbsp; &nbsp; 
      0x99,0x99,0x99,0x01,&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;//1<BR>&nbsp; 
      &nbsp; 0x33,0x33,0x33,0x03,&nbsp; &nbsp;&nbsp; 
      &nbsp;&nbsp;&nbsp;//2<BR>&nbsp; &nbsp; 0xcc,0xcc,0xcc,0x04,&nbsp; 
      &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;//3<BR>&nbsp; &nbsp; 
      0x66,0x66,0x66,0x06,&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;//4<BR>&nbsp; 
      &nbsp; 0x00,0x00,0x00,0x08,&nbsp; &nbsp;&nbsp; 
      &nbsp;&nbsp;&nbsp;//5<BR>&nbsp; &nbsp; 0x99,0x99,0x99,0x09,&nbsp; 
      &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;//6<BR>&nbsp; &nbsp; 
      0x33,0x33,0x33,0x0b,&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;//7<BR>&nbsp; 
      &nbsp; 0xcc,0xcc,0xcc,0x0c,&nbsp; &nbsp;&nbsp; 
      &nbsp;&nbsp;&nbsp;//8<BR>&nbsp; &nbsp; 0x66,0x66,0x66,0x0e&nbsp; 
      &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;//9<BR>};<BR>unsigned char 
      code dds_word_10khz[10][4]={<BR>&nbsp; &nbsp; 0x00,0x00,0x00,0x00,&nbsp; 
      &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;//0<BR>&nbsp; &nbsp; 
      0xc2,0xf5,0x28,0x00,&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;//1<BR>&nbsp; 
      &nbsp; 0x85,0xeb,0x51,0x00,&nbsp; &nbsp;&nbsp; 
      &nbsp;&nbsp;&nbsp;//2<BR>&nbsp; &nbsp; 0x47,0xe1,0x7a,0x00,&nbsp; 
      &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;//3<BR>&nbsp; &nbsp; 
      0x0a,0xd7,0xa3,0x00,&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;//4<BR>&nbsp; 
      &nbsp; 0xcc,0xcc,0xcc,0x00,&nbsp; &nbsp;&nbsp; 
      &nbsp;&nbsp;&nbsp;//5<BR>&nbsp; &nbsp; 0x8f,0xc2,0xf5,0x00,&nbsp; 
      &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;//6<BR>&nbsp; &nbsp; 
      0x51,0xb8,0x1e,0x01,&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;//7<BR>&nbsp; 
      &nbsp; 0x14,0xae,0x47,0x01,&nbsp; &nbsp;&nbsp; 
      &nbsp;&nbsp;&nbsp;//8<BR>&nbsp; &nbsp; 0xd7,0xa3,0x70,0x01,&nbsp; 
      &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;//9<BR>};<BR>unsigned char code 
      dds_word_1khz[10][3]={<BR>&nbsp; &nbsp; 0x00,0x00,0x00,&nbsp; &nbsp;&nbsp; 
      &nbsp;&nbsp;&nbsp;//0<BR>&nbsp; &nbsp; 0x93,0x18,0x04,&nbsp; &nbsp;&nbsp; 
      &nbsp;&nbsp;&nbsp;//1<BR>&nbsp; &nbsp; 0x26,0x31,0x08,&nbsp; &nbsp;&nbsp; 
      &nbsp;&nbsp;&nbsp;//2<BR>&nbsp; &nbsp; 0xba,0x49,0x0c,&nbsp; &nbsp;&nbsp; 
      &nbsp;&nbsp;&nbsp;//3<BR>&nbsp; &nbsp; 0x4d,0x62,0x10,&nbsp; &nbsp;&nbsp; 
      &nbsp;&nbsp;&nbsp;//4<BR>&nbsp; &nbsp; 0xe1,0x7a,0x14,&nbsp; &nbsp;&nbsp; 
      &nbsp;&nbsp;&nbsp;//5<BR>&nbsp; &nbsp; 0x74,0x93,0x18,&nbsp; &nbsp;&nbsp; 
      &nbsp;&nbsp;&nbsp;//6<BR>&nbsp; &nbsp; 0x08,0xac,0x1c,&nbsp; &nbsp;&nbsp; 
      &nbsp;&nbsp;&nbsp;//7<BR>&nbsp; &nbsp; 0x9b,0xc4,0x20,&nbsp; &nbsp;&nbsp; 
      &nbsp;&nbsp;&nbsp;//8<BR>&nbsp; &nbsp; 0x2f,0xdd,0x24,&nbsp; &nbsp;&nbsp; 
      &nbsp;&nbsp;&nbsp;//9<BR>};<BR>unsigned char code 
      dds_word_100hz[10][3]={<BR>&nbsp; &nbsp; 0x00,0x00,0x00,&nbsp; 
      &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;//0<BR>&nbsp; &nbsp; 0xdb,0x68,0x00,&nbsp; 
      &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;//1<BR>&nbsp; &nbsp; 0xb7,0xd1,0x00,&nbsp; 
      &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;//2<BR>&nbsp; &nbsp; 0x92,0x3a,0x01,&nbsp; 
      &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;//3<BR>&nbsp; &nbsp; 0x6e,0xa3,0x01,&nbsp; 
      &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;//4<BR>&nbsp; &nbsp; 0x49,0x0c,0x02,&nbsp; 
      &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;//5<BR>&nbsp; &nbsp; 0x25,0x75,0x02,&nbsp; 
      &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;//6<BR>&nbsp; &nbsp; 0x00,0xde,0x02,&nbsp; 
      &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;//7<BR>&nbsp; &nbsp; 0xdc,0x46,0x03,&nbsp; 

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