Support for BME280 Temperature Correction

[NorthernMan54]

Description:

The Spark Fun BME 280 library has support for Temperature correction, and this pull request implements the ability to apply a correction via a compiler directive ( BME280Correction ).

Correction is in celcius of temperature reported by bme280 sensor. Both Celcius and Farenheit tempaeratures are adjusted.
Value is a float
ie Compiler Directive '-DBME280Correction=-3.4'

Checklist:

• The pull request is done against the latest development branch
• Only one feature/fix was added per PR and the code change compiles without warnings
• I accept the DCO.

[NorthernMan54]

I found that with my esp32's, cc1101 and bme280 all in the same case the temperature reading was always high.

[1technophile]

Nice, could you add this macro into the .h config file for the BME280 please, so that the users know that this is available? Also, you could activate it into some *-test environments to verify that the build works with it.

[NorthernMan54]

I changed the macro logic based on your recommendation and define it in the BME280 config file. And have added BME280Correction to the esp32dev-all-test environment.

PS Any tips on flattening the commits?

[h2zero]

@NorthernMan54 git rebase -i then mark the extra commits with s or squash. Then force push to the branch. However, it can be done by the github interface anyway so there isn't really a need unless you want to.

[1technophile]

Thanks. Don't worry I will squash them.
For your knowledge you can also take the first commit sha and rebase from it
git rebase -i <sha>, a text editor will open, put an s in front of the commit you want to squash, save
and after do a git push -f

[NorthernMan54]

Tks