Algo for rms computation?

I’m entertaining a true rms computation on MSPM0G3507 for the 10Hz…100KHz range.

The MCU is limited to 32K RAM, so I’d change the sampling frequency if I can determine the signal is periodic and in the lower frequency range.

Is there any algorithm that aims capture N periods of a periodic signal?

Should I be better of by going into frequency domain with a proper window function, and possibly trying multiple sampling rates to choose the proper range?

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scottiebabe over 2 years ago

Interesting chip!

I didn't see the cycle counts for the math co-processor but it looks interesting.
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ggabe over 2 years ago in reply to scottiebabe

Yes, it is interesting. TI is selling the EVB for $16 direct. The part is very much a new item, TI is not sampling it yet. The accelerator is cool, but not as advanced as the MSP430's LEA.
The benefit for me is no need for noisy SPI bus between ADC and CPU, and I can treat the MCU, once programmed, as a single part RMS converter.
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ggabe over 2 years ago in reply to scottiebabe

Yes, it is interesting. TI is selling the EVB for $16 direct. The part is very much a new item, TI is not sampling it yet. The accelerator is cool, but not as advanced as the MSP430's LEA.
The benefit for me is no need for noisy SPI bus between ADC and CPU, and I can treat the MCU, once programmed, as a single part RMS converter.
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