TMS320F280049C: CMPSS Comparator Cycle by Cycle COMPDAC Value Update

Ahmet Talha Dudak

Part Number: TMS320F280049C

Hi,

I perform the cycle by cycle pik current mode control. I use both high comparator and low comparator of the CMPSS. I update the value of COMPDAC with 100 kHz ISR. My code is working with constant COMPDAC value. But, when I update with the 100kHz ISR the COMPDAC value, my code behaves strangely. ADC readings, Cycle by Cycle PWM and the other functions is not working for variable COMPDAC value.

What is the problem ?

Thanks,

over 1 year ago

0 Ahmet Talha Dudak over 1 year ago

Prodigy 70 points

Hi,

I guess, this problem is usage of 2 quantity CMPSS. I use CMPSS5 and CMPSS6. I update the COMPDAC values with EPMW4SYNCPER. If I use only one CMPSS, my code is working. But, If I use CMPSS5 and CMPSS6, COMPDAC values is not updated.

So, what can I solve this problem ?

Thanks,

0 Benjamin Collier over 1 year ago in reply to Ahmet Talha Dudak

TI__Mastermind 33116 points

Ahmet,

I will need a little time to look into this.

Best Regards,

Ben Collier

0 Ahmet Talha Dudak over 1 year ago in reply to Benjamin Collier

Prodigy 70 points

Hi,

I solved the problem. I have three epwm interrupt and they interpenetrate each other. So, my code is not working. Now, my comparators are working correctly.

Thanks,

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TMS320F280049C: CMPSS Comparator Cycle by Cycle COMPDAC Value Update