CCS/TMS320F28379D: Achieving Maximum Sampling Rate

Hi,

You need to configure the trigger frequency(pwm frequency) as per the desired frequency.

Thanks

Vasudha

Hello,

Thank you for your reply. That's what I've been trying to do by setting the TBPRD. Although, I'm not sure what the system's clock is sampling at, and what is the minimum value I can set the TBPRD to. Anything below 2800, and I'm unable to even read any samples. Would you know why that is?

Best,

Ajay

Hi,

Are you able to run successfully the C2000Ware example mentioned above? Please refer to EPWM chapter in TRM for details on configuring EPWM registers for desired frequency.

Thanks

Vasudha

Yes, I'm able to program the EPWM frequency to about 7 MHz (checked using GPIO Pins), but while monitoring the buffer, I'm still getting distorted images for frequencies as low as 1 kHz. Is the ADC sampling with a different clock, or is continuously writing to memory distorting the graphs? I want to be able to sample any signal with frequencies up to 2 MHz.  

Hi,

yes I think EPWM frequency is too high for ADC trigger. The time between two triggers should be atleast equal to the end of conversion time for configured SOCs to get correct result.

One approach could be to trigger 16 SOCs for same channel and trigger all the SOCs through same EPWM configured to trigger after 16 SOCs finish conversion.

Thanks

Vasudha