EDDP - ADC & PWM synchronization

[valahia]

I was wondering if the ADC sampling is synchronized with the PWM signal in order to avoid sampling, when the PWM is switching. I was looking through the code but could not find anything about  this.

Thanks for help,
Adi

[Oleksandr Kiyenko]

Hello Adi,

It's possible, but it's not a good solution as a project become more platform dependent. If you want to improve the project in this direction, maybe better to add a low-pass filter?

Best regards
Oleksandr Kiyenko

[valahia]

Oleksandr,

I really appreciate your response. Indeed a filter is useful for low power applications, but I don't think would have the same efficiency for higher power machines. Now, this idea with synchronizing the ADC & PWM, in order to avoid sampling during the switching, is very popular on the DSPs. Normally the PWM is generated by a up-down counter and the ADC would sample when counter = zero or when counter =  period or both.

Because I am looking to have a synchronization between PWM and ADC, and to be able to trigger the ADC sampling only at a specific times given by PWM, let me know if you have any suggestions, as at this moment I don't have a thorough understanding on how this application works.

Best regards,
Adi
 

[Oleksandr Kiyenko]

Hello Adi,

so you need to modify axis_AD7403 and axis_pwm cores to work together. This cores you can find in ip_lib folder in the platform project.

Best regards
Oleksandr Kiyenko

[valahia]

I guess that's the way to go Oleksandr!

Best regards,
Adi