CCS/TMS320F28377S: TMS320F28377S

Shyam,

- How to implement moving average filter.

You could implement a moving average filter using an FIR with all coefficients at 1/N, where N is your filter length. You could easily code it youself in C, or for a floating-point device like this, use the FIR filter in the FPU DSP library in C2000Ware at:
C:\ti\c2000\C2000Ware_1_00_04_00\libraries\dsp\FPU\c28

- Why is it preferred over low pass filter.
It's popular for two reasons:
1. It's simple to understand and use, and
2. It has good transient response, for example if you want a noise filter with good step response.

- How will its bode plot be.
Its' frequency performance is poor: you get poor roll off and stop band attenuation. For an N-tap filter, the frequency magnitude is

|H(f)| = (1/N) * sin(pi * f * N) / (N * sin(pi * f)

It looks a bit like |sinc(x)| for x>0. You can find more information in any book on digital filtering.

Regards,

Richard