tools/battor_agent: Prints real BattOr samples instead of raw ones

tools/battor_agent/battor_sample_converter.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "battor_sample_converter.h"
 
 #include <stdlib.h>
 
 namespace battor {
 
@@ skipping 33 matching lines @@
     baseline_current_ += ToUnitfulVoltage(sample.current_raw);
     baseline_voltage_ += ToUnitfulVoltage(sample.voltage_raw);
   }
 
   baseline_current_ /= calibration_frame.size();
   baseline_voltage_ /= calibration_frame.size();
 }
 
 BattOrSampleConverter::~BattOrSampleConverter() {}
 
-BattOrSample BattOrSampleConverter::ToSample(
-    const RawBattOrSample& sample) const {
+BattOrSample BattOrSampleConverter::ToSample(const RawBattOrSample& sample,
+                                             size_t sample_number) const {
   // Subtract out the baseline current and voltage that the BattOr reads even
   // when it's not attached to anything.
   double current = ToUnitfulVoltage(sample.current_raw) - baseline_current_;
   double voltage = ToUnitfulVoltage(sample.voltage_raw) - baseline_voltage_;
 
   // The BattOr has to amplify the voltage so that it's on a similar scale as
   // the reference voltage. This is done in the circuit using resistors (with
   // known resistances r2 and r3). Here we undo that amplification.
   double voltage_divider = eeprom_.r3 / (eeprom_.r2 + eeprom_.r3);
   voltage /= voltage_divider;
@@ skipping 13 matching lines @@
   // we can get the current by dividing this voltage by the resistance.
   current /= eeprom_.r1;
 
   // Convert to milliamps.
   current *= 1000;
 
   // Each BattOr is individually factory-calibrated. Apply these calibrations.
   current -= eeprom_.low_gain_correction_offset;
   current /= eeprom_.low_gain_correction_factor;
 
-  return BattOrSample{voltage, current};
+  double time_ms = double(sample_number) / eeprom_.sd_sample_rate * 1000;
+
+  return BattOrSample{time_ms, voltage, current};
 }
 
 }  // namespace battor