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AD9833 problems loading frequency register using PIC18

Question asked by azeasi on Jun 22, 2011
Latest reply on Jun 23, 2011 by azeasi

I am having problems with the  AD9833 using a PIC18F2550 and the Microchip C18 Compiler. I seem to be able to load the Control register OK, because I

Am able to turn the output of the DDS on and off. But I can't change the output frequency it remains at 3.124616 Mhz regardless of what frequncy

value I try to load. I have attached my code and screen shot of the SPI lines (CLK and DATA). I am using 25 Mhz MCLK and hex values from app note

AN-1070. Any help would be much appreciated.

George

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