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//8<BR> 0xb7,0xaf,0x03
//9<BR>};<BR>unsigned char code
dds_word_10hz[10][2]={<BR> 0x00,0x00,
//0<BR> 0x7c,0x0a,
//1<BR> 0x14,0xf8,
//2<BR> 0x75,0x1f,
//3<BR> 0xf1,0x29,
//4<BR> 0x6d,0x34,
//5<BR> 0xea,0x3e,
//6<BR> 0x66,0x49,
//7<BR> 0xe2,0x53,
//8<BR> 0x5f,0xfe
//9<BR>};<BR>unsigned char code
dds_word_1hz[10][2]={<BR> 0x00,0x00,
//0<BR> 0x0c,0x01,
//1<BR> 0x18,0x02,
//2<BR> 0x25,0x03,
//3<BR> 0x31,0x04,
//4<BR> 0x3e,0x05,
//5<BR> 0x4a,0x06,
//6<BR> 0x57,0x07,
//7<BR> 0x63,0x08,
//8<BR> 0x6f,0x09
//9<BR>};<BR><BR>/********************************************/<BR><BR>//控制字计算<BR>void
fre2word(void){<BR> unsigned int temp1,temp2;<BR>
//计算W0的值。注意，本例DDS工作在串行方式，这里W0是指控制字低8位，请区别于并行方式<BR>
temp1=dds_word_1hz[fre[7]][0]+dds_word_10hz[fre[6]][0]+dds_word_100hz[fre[5]][0]+dds_word_1khz[fre[4]][0]+dds_word_10khz[fre[3]][0]+dds_word_100khz[fre[2]][0]+dds_word_1mhz[fre[1]][0]+dds_word_10mhz[fre[0]][0];<BR>
W[0]=(unsigned char)temp1;<BR> //计算W0相加时的进位<BR>
temp2=(unsigned char)(temp1>>8);<BR><BR>
//计算W1值<BR>
temp1=dds_word_1hz[fre[7]][1]+dds_word_10hz[fre[6]][1]+dds_word_100hz[fre[5]][1]+dds_word_1khz[fre[4]][1]+dds_word_10khz[fre[3]][1]+dds_word_100khz[fre[2]][1]+dds_word_1mhz[fre[1]][1]+dds_word_10mhz[fre[0]][1]+temp2;<BR>
W[1]=(unsigned char)temp1;<BR> temp2=(unsigned
char)(temp1>>8);<BR><BR> //计算W2值<BR>
temp1=dds_word_100hz[fre[5]][2]+dds_word_1khz[fre[4]][2]+dds_word_10khz[fre[3]][2]+dds_word_100khz[fre[2]][2]+dds_word_1mhz[fre[1]][2]+dds_word_10mhz[fre[0]][2]+temp2;<BR>
W[2]=(unsigned char)temp1;<BR> temp2=(unsigned
char)(temp1>>8);<BR><BR> //计算W3值<BR>
temp1=dds_word_10khz[fre[3]][3]+dds_word_100khz[fre[2]][3]+dds_word_1mhz[fre[1]][3]+dds_word_10mhz[fre[0]][3]+temp2;<BR>
W[3]=(unsigned char)temp1;<BR>}</DIV></DIV>
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