Function phydat_prefix_from_scale

pub unsafe extern "C" fn phydat_prefix_from_scale(scale: i8) -> c_char

@brief Convert the given scale factor to an SI prefix

The given scaling factor is returned as a SI unit prefix (e.g. M for Mega, u for micro, etc), or \0 otherwise.

@param[in] scale scale factor to convert

@return SI prefix if applicable @return \0 if no SI prefix was found