Sine wave generation from TMS320f28379d in simulink with variable frequency.

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bahurii sahu 2021-2-26

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https://ww2.mathworks.cn/matlabcentral/answers/756699-sine-wave-generation-from-tms320f28379d-in-simulink-with-variable-frequency

编辑： MULI 2025-6-4

Iam working with TMS320f28379D i want to know how i can generate a sine wave using dac with where i want to change the frequency of the system in realtime. the frequency value i want to give through a push button or potentiometer using adc.

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Abasiodiong Jackson 2023-1-26

You can design a simulink program to do this. However, I find that there is an issue with the sinewave generated by the DAC where it is affected by the clock setting. What is the purpose for generating the sinewave?

MULI 2025-6-4

编辑：MULI 2025-6-4

Hi @bahurii sahu,

You can create a sine wave using the TI C2000 LaunchPad and Simulink by using a DAC block along with a sine wave lookup table.
You can refer to the below MathWorks forum post for generating a sine wave :https://www.mathworks.com/matlabcentral/answers/426925-how-can-i-create-sinus-wave-by-using-ti-c2000-launchpad-and-simulink
You can output the sine wave through the DAC by cycling through a list of pre-calculated sine values (lookup table).
To control the frequency in real time, you can read the voltage from a potentiometer using an ADC pin.
Based on that input, you adjust how quickly you step through the lookup table faster stepping means a higher frequency, and slower stepping gives a lower frequency.
This setup allows you to smoothly vary the output frequency using simple hardware like a knob or button.