How do I encode to a TMS320F28335 and see PWM signals live?

I am running a PWM DC to DC converter using the TMS320F28335 digital signals processor on a TMDSPREX28335 mounting board. When I download the program, involving ADC PIDs and PWM blocks, the download will be successful but the transistors are stuck on or 100% duty cycle. If I switch the controller off and back on the circuit functions correctly but I am unable to view the values of the program with scopes because in the process of turning the controller off and back on the DSP loses communication with the DSP. The DSP is being powered and programmed through the USB.

[Pemendra Kumar Pardhi]

Hi, Are you want to see the pwm signal on code composer studio or on matlab.

[Ryan Donovan]

I want to be able to see voltage and current values from the ADC and PID controller output values aswell. Al of this I want to see live in simulink. I know people who have done similar projects and they never had the problem I described.

[Pemendra Kumar Pardhi]

You should run the model in external mode. If this option is not available in your matlab version Use build and monitor in MATLAB. Your model will be in discret time domain and in scope set exact sample time

[Ryan Donovan]

The program is being run in external and the version I’m using is 2018b. I haven’t tried Build and Monitor in Matlab though so I’ll see if I can do that thanks.

[Ryan Donovan]

After some googling I am not sure what you mean by build and monitor. Do you have any links to learn about how to do that? Also I’ve been downloading to the DSP by simply pressing the green circle with the arrow in it in case that means anything.

Answer 1

[Pemendra Kumar Pardhi]

Hello ryan,

As per your comment, you are able to run the model in external mode,then general the pwm signals As given below link

https://in.mathworks.com/matlabcentral/answers/862265-code-generation-for-tms320f28379d-using-matlab-with-repeating-sequence-and-relational-operators-bloc?s_tid=srchtitle

In given above link pls replace reapitative sequence With Repeating Sequence Interpolated

And at the end of logical operator connect scope On scope you can observe pwm signals

Thanks Pemendra Pardhi