edf_set_digital_minimum — Sets the minimum digital value of signal edfsignal.
edf_set_digital_minimum(edf_handle, edfsignal, dig_min)
This function is optional and can be called only after opening a file in writemode and before the first sample write action.
edf_handle is the file handle of the opened bdf/gdf-file
dig_min - Usually, the value -32768 is used for EDF+ and -8388608 for BDF+. Usually this will be (-(dig_max + 1)).