1 /** 2 * Copyright 2017 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "dbusactiveread.hpp" 18 19 #include "util.hpp" 20 21 #include <chrono> 22 #include <cmath> 23 #include <iostream> 24 25 namespace pid_control 26 { 27 28 ReadReturn DbusActiveRead::read(void) 29 { 30 struct SensorProperties settings; 31 double value; 32 33 _helper->getProperties(_bus, _service, _path, &settings); 34 35 value = settings.value * pow(10, settings.scale); 36 37 /* 38 * Technically it might not be a value from now, but there's no timestamp 39 * on Sensor.Value yet. 40 */ 41 struct ReadReturn r = {value, std::chrono::high_resolution_clock::now()}; 42 43 return r; 44 } 45 46 } // namespace pid_control 47