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TMS320F28335: Controlling duty cycle of EPWM and using interrupt.

Chaya Kiranmayee Reddy Gaddam
Prodigy 140 points
Part Number: TMS320F28335
Other Parts Discussed in Thread: C2000WARE

Hi,

 

I am working EPWM with target TMS320F28335 to control duty cycle.

 

I had did configuration of registers and gave period and all. As off now Oscilloscope is not available  with me so, I used Interrupt and counter in this. To see counter value so that I can make sure it is working.

 

when I debug my counter value is getting incremented but, for every counter value there is difference in same range (like 72 0r 3 ) based on counter mode I select (UPDOWN, UP).

 

when I seen increment in counter value I assumed my code is working.

 

I want to know why the difference is coming in this counter value, is it okay. But difference range is same.

 

In CLKDIV & HSPCLKDIV i tried changing values with that I got to know this is being valid with statement "time is inversely proportional to frequency".

 

Here I am attaching the output screenshot and configuration. In one screenshot am using UPDOWN and in another UP mode.  

 

 

 

Thanks & Regards,

 

Chaya