There is 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 done by @jackie

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Authored-by: Jakob (XDjackieXD) Riepler <jakob.riepler@chaosfield.at>