def create_global_definition(fit_entity)
      messages = fit_entity.developer_fit_messages
      unless (gfm = GlobalFitMessages[@native_mesg_num])
        Log.error "Developer field description references unknown global " +
          "message number #{@native_mesg_num}"
        return
      end

      if @developer_data_index >=
           fit_entity.top_level_record.developer_data_ids.size
         Log.error "Developer data index #{@developer_data_index} is too large"
         return
      end

      msg = messages[@native_mesg_num] ||
        messages.message(@native_mesg_num, gfm.name)
      unless (@fit_base_type_id & 0x7F) < FIT_TYPE_DEFS.size
        Log.error "fit_base_type_id #{@fit_base_type_id} is too large"
        return
      end
      options = {}
      options[:scale] = @scale if @scale
      options[:offset] = @offset if @offset
      options[:array] = @array if @array
      options[:unit] = @units
      msg.field(@field_definition_number,
                FIT_TYPE_DEFS[@fit_base_type_id & 0x7F][1],
                "_#{@developer_data_index}_#{@field_name}", options)
    end
def create_global_definition(fit_entity)
      messages = fit_entity.developer_fit_messages
      unless (gfm = GlobalFitMessages[@native_mesg_num])
        Log.error "Developer field description references unknown global " +
          "message number #{@native_mesg_num}"
        return
      end

      if @developer_data_index >=
           fit_entity.top_level_record.developer_data_ids.size
         Log.error "Developer data index #{@developer_data_index} is too large"
         return
      end

      msg = messages[@native_mesg_num] ||
        messages.message(@native_mesg_num, gfm.name)
      unless (@fit_base_type_id & 0x7F) < FIT_TYPE_DEFS.size
        Log.error "fit_base_type_id #{@fit_base_type_id} is too large"
        return
      end
      options = {}
      options[:scale] = @scale if @scale
      options[:offset] = @offset if @offset
      options[:array] = @array if @array
      options[:unit] = @units
      msg.field(@field_definition_number,
                FIT_TYPE_DEFS[@fit_base_type_id & 0x7F][1],
                "_#{@developer_data_index}_#{@field_name}", options)
    end
Create a new FieldDescription object.
 @param field_values [Hash] Hash that provides initial values for certain
        fields.