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TMS320F28P550SJ: CMPSS Output

Akash Palavai
Prodigy 10 points

Part Number: TMS320F28P550SJ

Dear TI Support Team,

We are trying to know how the comparator ramp generator works, we are giving 2VDC to the comparator High Positive input and negative input is from the ramp generator through Internal DAC.
We are taking Ramp_reference value to 65535, and step value is 66 with ramp clock (SYSCLK/10 = 15MHz). and this max reference value will be reloaded with trigsync pulse coming from EPWMSYNCPER signal @ 15kHz. The expected output should be the square pulse as shown in the below diagram, we are not getting the output as expected. We are attaching the board.c , board.h and the CMPSS output waveform captured from oscilloscope. 

Are we configuring the CMPSS Ramp generator correct? OSCI_WAVEFORM.jpg

board.c board.h 

Untitled Diagram.drawio.png

 

 

  • 0
    TI__Intellectual 2990 points

    Hi Akash,

    As shown in TRM, the ramp will jump to Max Reference Value after it is equal to COMPxHP value. Then COMPxSTS will be a pulse. A pulse is expected for this behavior of ramp generator.
    In the figure you have shared, ramp is continued to fall until EPWMSYNCPER signal. 

    Thanks
    Praneeth