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need help in atmega16 sine wave genrator using ad9833

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ud23

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hi i am using atmega 16 and ad9833 to generate sine wave in range of 1hz to 1Mhz. i hav some example code for it i try to see them but i didn't get any sine wave output from ad9833.

I made fuction for tuning word can any one suggest where am i wrong.


void output(unsigned long freq_value)
{
unsigned long dds;
unsigned int dds_l,dds_h;


dds= freq_value *268435456/ FMCLK;
dds=dds<<2;
dds_l=dds;
dds_h=dds>>16;

dds_l=dds_l>>2;
dds_l=dds_l & 0x7FFF;
dds_l=dds_l | 0x4000;

dds_h=dds_h & 0x7FFF;
dds_h=dds_h | 0x4000;

Write_word(0x2000);
Write_word(dds_l);
Write_word(dds_h);
}

where FMCLK=25Mhz
pleas help me if any correction in it.
 

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