How can I show PWM signal using c2000 F28379D?

Question

Cristina 2024-3-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2089466-how-can-i-show-pwm-signal-using-c2000-f28379d

评论： Cristina 2024-3-20

采纳的回答： Sayan

PWM_natural.slx

Hi, I have tried to see a PWM signal but when simulating I get a 1 signal all the time.

I attach screenshots

I have connected pin 80 to pin 74 which are the GPIO0 and GPIO14 pins.

I know that the "ePWM" block is well configured because I have been able to see the output signal with an oscilloscope.

I hope you can help me, thank you in advance.

Cristina

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Answer 1

Sayan 2024-3-13

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https://ww2.mathworks.cn/matlabcentral/answers/2089466-how-can-i-show-pwm-signal-using-c2000-f28379d#answer_1424481

Hi Cristina,

If I am understanding it correctly, you are using a 4 kHz carrier frequency to generate the pwm. In this case, I can see you are using the GPIO digital input sample time of 0.1, which is very high for logging the PWM samples. Try to reduce the GPIO sample time to 1e-5 and log the signal in Simulink Data Inspector to visualize the signal. Ensure the GPIO block is configured correctly for the corresponding pin you are shorting.

You can find more information about GPIO in the following documentation.

https://www.mathworks.com/help/releases/R2022b/supportpkg/texasinstrumentsc2000/ref/c280xc2802xc2803xc2805xc2806xc2833xc2834xf28m3xf2807xf2837xdf2837xsf2838xf2838xm4f28004xf28002xf28003xgpiodigitalinput.html

Hope this helps to resolve the issue.