BLE fixes 2020 1

See merge request !381

See merge request !379

See merge request !378

This speeds up file transfers from Linux machines. Looks like the impact
on power consumption is not too large. Android also does not seem to
take this into account.

Default main app selector

See merge request card10/firmware!375

I need unit tests :/

This allows to read and write strings to the config file.

Allows to set the string value of a key. Perists the value to the
configuration file.

Introduces a small state machine which parses the file character by
character. This eases the logic around parsing whole lines
significantly.

Now also trims lines, handling all non printable characters correctly.

max86150 pycardium api

See merge request card10/firmware!359

See merge request card10/firmware!376

Stable max86150 epicardium API

See merge request card10/firmware!371

Jakob authored 5 years ago and Arist committed 5 years ago

Epicardium API for max86150 aligned with latest state of sensor
development on card10.

Co-Authored-by: Arist <aristkojevnikov@gmail.com>

Jakob authored 5 years ago and Arist committed 5 years ago

Get samples from FIFO by small junks due to a recommendation from Maxim
not to read the entire FIFO, but rather a fixed number of samples.
See https://os.mbed.com/users/laserdad/code/MAX86150_ECG_PPG//file/3c728f3d1f10/main.cpp/



Additional tuning for particular configuration of max86150 in card10.

Co-Authored-by: Arist <aristkojevnikov@gmail.com>