Re: AD9833 Can't Change Frequency

Hi,

I noticed that your code became lengthy because in every function, you set reset and exit reset.

I suggest, you do this only once and put it in your main function.

just to check if your spi write is good, I suggest you try resetting first: 0x0100. You should have a midscale output (~330mV)

If you get that, then you may proceed with the addition of other functions.

here are my suggestions on your code.

#include

#define

static void ad9833_word()

//remove ad9833_write function

void AD9833_setFreq()

     //remove reset bit cycle here

     AD9833_word(x0400+14-bit LSBs);

     AD9833_word(x0400+14-bit MSBs);

void AD9833_setPhase()

     //remove reset bit cycle here

void AD9833_setMode()

     //I didn't check the cases but I assume you followed table 15 in datasheet.

void init_SPI1()

main function ()

     AD9833_word(0x2100);    //DB13=1 and resetbit=1

     AD9833_setFreq(frequency);

    //you can skip setting phase

     AD9833_word(0x2000);    //DB13=1 and resetbit=0

Please let me know if that worked.

-Sittie