calc _blackBoxRate based on real timestamps

[mituritsyn]

In some conditions the actual logging speed may differ from that set by the settings, it may be worth minimising such situations at the firmware level, but if we get such data we will be able to adequately handle them.
Issue was reported by @demvlad

Uploading HQProp.zip…

[demvlad]

Yes! You found log records count computing in 3 rows code!
What i think.
I try to use actual log rate for good log file from my other quad. For example, one log has 2002Hz actual rate instead of 2000 from config data. But even in this case i see that frequency axis has main ticks labels with fractional (not int) values. May be use actual rates in case of significantly rate difference only (5% for example).
The situations like my FC are rare. Maybe show some warning at the spectrum chart in this case.
I have my realization of resolving this issue what is showed warnings at spectrum chart. But it has bad realization of logs records count computing. I can add warning show into your code.

[demvlad]

or would you mind if I will use your codes fragment in my realization?

[mituritsyn]

or would you mind if I will use your codes fragment in my realization?

I have a feeling that this implementation has significantly increased graphs loading time, I want to test another way to calculate the data rows count, but it is not so elegant and is based on some assumptions that need to be tested as well.

[demvlad]

I have a feeling that this implementation has significantly increased graphs loading time, I want to test another way to calculate the data rows count, but it is not so elegant and is based on some assumptions that need to be tested as well.

This is good, if faster solution is exists.
I've notice, that this procedure have some delay for big time interval. There is the time limit 5min flight time in source specter code.
But i think, maybe better to make this checking once when log is loaded. As we look, this is a bad situation till. Maybe better to informed about it after log loading. And use this data from log class in spectrum chart as ready.

I am not full study till, how works log data parsing code... I have some questions to minmax computing and want to resolve their in future.

[sonarcloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[haslinghuis]

@mituritsyn please rebase - to resolve conflicts.

[nerdCopter]

@demvlad , does this fit into your #711 somehow, or is it a duplication in essence?
when i attempted to merge locally there is obvious conflict.
This PR will need closure, but unsure if a new "PWA" compatible/rebase version need to be opened or not.

[demvlad]

@demvlad , does this fit into your #711

@nerdCopter Yes, this improvement is closed in #711.
The PR #718 completes this work.