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TMS320C28343 - Make ADC work with sinusoidal input

Prodigy 50 points

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I’m using on my graduation work a TMS320C28343. This board has 2 external ADC (ADS7865) and to work with then I’m using the example Bellow:

<CONTROLSUITE_INSTALL_DIR>\device_support\c2834x\v112\DSP2834x_examples_ccsv4\adc_on_xintf

Now I’m trying to change this code to work with sinusoidal input. Using the graph to see the data i can only see a half wave with the example code.

Somebody know what i have to change on code and hardware to see a complete sinusoidal with the graph?

 

Thaks for helping.