TMS320F28379D: Using Matlab Simulink to use DAC1, DAC2, DAC3, and DAC4 pins

Reza Heidari

Part Number: TMS320F28379D
Other Parts Discussed in Thread: LAUNCHXL-F28379D

Hi,

I could active DAC block in the support package and achieve the output through DACA/ADCINA0 and DACB/ADCINA1, but I do not know how to use DAC1, DAC2, DAC3, and DAC4 whose pins, 32, 31, 72 and 71 respectively, embedded on launchpad boards. How can I give a digital value (0-4095) to these pins through using MATLAB/simulink and see the signal on oscilloscope.

Thanks for your nice forum

over 6 years ago

0 Mark Labbato over 6 years ago

Guru 30330 points

Reza,

The DAC pins you are referring to on the LAUNCHXL-F28379D are all EPWM pins connected to an RC circuit to create a PWM-based DAC. You will need to use the EPWM and calculate the translation from duty cycle to digital DAC value. here is an Application Note on the topic: spraa88a

Regarding Matlab Simulink, you can contact Mathworks support or try to find a pwm duty cycle modification model in their examples for reference.

-Mark

0 Brian McKay over 6 years ago

Mastermind 9005 points

Hi Reza,

Looks like these pins are connected to PWM7A, 7B, 8A and 8B. Search for the PWM_DAC in http://www.ti.com/lit/ug/sprui77b/sprui77b.pdf

In our motor control example we show how to use our PWM block as a DAC.

https://www.mathworks.com/help/supportpkg/texasinstrumentsc2000/ug/permanent-magnet-synchronous-motor-field-oriented-control.html

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You can open example model c28069pmsmfoc_ert, and see the below subsystem:

c28069pmsmfoc_ert/FOC Alogrithm/Torque Control Algorithm/Generating Space Vectors/Generating Raw Space Vectors/Send to DAC 3

The same technique would apply to F28379D

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

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TMS320F28379D: Using Matlab Simulink to use DAC1, DAC2, DAC3, and DAC4 pins