Add COM metric reporting.

[capn-freako]

The Channel Operating Margin (COM) method of measuring high speed serial communication channel performance is becoming more and more popular. I'd like to add this ability to PyBERT.

[capn-freako]

I think this Anritsu white paper is a great reference for the details of COM calculation.
(In particular, see Sec. 3.)

Most other references I'm finding tend to refer the reader to M-code scripts and MS Excel spreadsheets, which aren't very helpful to us writing Python code.

[dracid]

I've been hunting the COM code for some time :))
It's actually openly accessible here:
https://www.ieee802.org/3/df/public/tools/index.html

mellitz_3dj_02_elec_230817_COM_v4p1_update.zip
mellitz_3df_02_2211_com_v3p9.zip

version 4.1 has the latest code, but no config sheets.
version 3.9 has the code AND a few example of the config sheets.

Yes, it's an M file for Matlab (not Octave). I haven't yet found if anyone has re-implemented it in python.

[capn-freako]

Yes, it's an M file for Matlab (not Octave). I haven't yet found if anyone has re-implemented it in python.

Thanks, @dracid !
I've taken a first stab at this and am wondering if you might have time to look over my code and comment:

PyBERT/src/pybert/utility.py

Line 1487 in 860e34a

def calc_com(ui, sbr, osf, ser, rlm, Av, Afe, Ane,

Thanks!
-db