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AD9910 controlled by MBED LPC1768 via SPI

I am a student with no experience in programming, and my project consists in controlling this DDS (AD9910) with the MBED model specified above. I am trying to send anything from de microcontroler to the DDS but I haven't have success. The code I have tested is attached in this discussion and I had tried lots of modifications on the numbers - including the frequency and format of SPI - but I have had no response on the DDS. Despite of that, I have successful communicated the MBED with a digital potentiometer with a similar code ( I will attach both codes). Can anyone help? I'm kind of lost. Thanks.
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