Using SPI WaveForms protocol to control AD9833

[Jurek]

I have the following problem with the SPI protocol in WaveForms. I am a beginner and I can't figure it out. My goal is to control the AD9833 chip via SPI. I can't get the chip to work; I can't change the waveform from sine to triangle or adjust the frequency. I'm not sure if the settings themselves are correct. 

Here are the steps I'm taking to send commands from the "Master" tab:

1. Adding the first command (Control word 0x2102):

    - Command: 0x2102
    - Bits: 16
    - Word bits: 16
    - Clicking the Execute button.

2. Adding the second command (Frequency LSB 0x4006):

    - Command: 0x4006
    - Bits: 16
    - Word bits: 16
    - Clicking the Execute button.

3. Adding the third command (Frequency MSB 0x402A):

    - Command: 0x402A
    - Bits: 16
    - Word bits: 16
    - Clicking the Execute button.

The problem is that each new command replaces the previous one.

I would like to appreciate your help.

 

ad9833.pdf

[attila]

Hi @Jurek

The commands are not 'replaced' just executed in sequence.
For easier testing of sequence of commands you can use the Custom tab.
Are you taking the DAC out of reset ?
 

[Jurek]

Thanks Attila, I think I have messed with the code, so need to understand it better. Still learning an SPI protocol.

 

Jurek