The external ADC will constantly convert, reading will give
the maximum value since the last read. This should avoid
missing any peaks.
The internal ADC will now only do one conversion upon read,
consider it abandoned for now.
To avoid false inputs on neighboring pads for very hard hits,
thresholds can now be scaled dynamically according to the highest
input.
This is controlled by the trigger_threshold_scale_level, ranging
from 0 for no scaling to 255 for max scaling. Mind that the scaling
is non-linear and changes in the higher end of the value range have
a much larger impact.
