Line data    Source code

       1             : // SPDX-FileCopyrightText: 2022-2023 Paul Colby <git@colby.id.au>
       2             : // SPDX-License-Identifier: LGPL-3.0-or-later
       3             : 
       4             : /*!
       5             :  * \file
       6             :  * Defines the CalibrationService and CalibrationServicePrivate classes.
       7             :  */
       8             : 
       9             : #include <qtpokit/calibrationservice.h>
      10             : #include "calibrationservice_p.h"
      11             : 
      12             : #include <QtEndian>
      13             : 
      14             : /*!
      15             :  * \class CalibrationService
      16             :  *
      17             :  * The CalibrationService class accesses the `Calibrartion` service of Pokit devices.
      18             :  */
      19             : 
      20             : 
      21             : /*!
      22             :  * Constructs a new Pokit service with \a parent.
      23             :  */
      24          90 : CalibrationService::CalibrationService(QLowEnergyController * const controller, QObject * parent)
      25          90 :     : AbstractPokitService(new CalibrationServicePrivate(controller, this), parent)
      26             : {
      27             : 
      28          90 : }
      29             : 
      30             : /*!
      31             :  * \cond internal
      32             :  * Constructs a new Pokit service with \a parent, and private implementation \a d.
      33             :  */
      34           0 : CalibrationService::CalibrationService(
      35           0 :     CalibrationServicePrivate * const d, QObject * const parent)
      36           0 :     : AbstractPokitService(d, parent)
      37             : {
      38             : 
      39           0 : }
      40             : /// \endcond
      41             : 
      42             : /*!
      43             :  * Destroys this CalibrationService object.
      44             :  */
      45          72 : CalibrationService::~CalibrationService()
      46             : {
      47             : 
      48          72 : }
      49             : 
      50             : /*!
      51             :  * \copybrief AbstractPokitService::readCharacteristics
      52             :  *
      53             :  * This implementation always returns `true`, since the Calibration service provides no *readable*
      54             :  * characteristics (they're all write-only).
      55             :  */
      56          18 : bool CalibrationService::readCharacteristics()
      57             : {
      58             :     Q_D(CalibrationService);
      59          18 :     qCDebug(d->lc).noquote() << tr("Ignoring read request; the Calibration service is write-only.");
      60          18 :     return true;
      61             : }
      62             : 
      63             : /*!
      64             :  * Set's the Pokit device's name to \a name.
      65             :  *
      66             :  * Returns `true` if the write request was successfully queued, `false` otherwise.
      67             :  *
      68             :  * Emits deviceNameWritten() if/when the \a name has been set.
      69             :  */
      70          36 : bool CalibrationService::calibrateTemperature(const float ambientTemperature)
      71             : {
      72             :     static_assert(sizeof(float) == 4, "Pokit devices expect 32-bit floats");
      73             :     Q_D(const CalibrationService);
      74             :     const QLowEnergyCharacteristic characteristic =
      75          36 :         d->getCharacteristic(CharacteristicUuids::temperature);
      76          36 :     if (!characteristic.isValid()) {
      77             :         return false;
      78             :     }
      79             : 
      80           0 :     const QByteArray newValue = CalibrationServicePrivate::encodeTemperature(ambientTemperature);
      81           0 :     qCDebug(d->lc).noquote() << tr("Writing new temperature %1 (0x%2).")
      82           0 :         .arg(ambientTemperature).arg(QLatin1String(newValue.toHex()));
      83           0 :     d->service->writeCharacteristic(characteristic, newValue);
      84           0 :     return (d->service->error() != QLowEnergyService::ServiceError::CharacteristicWriteError);
      85          36 : }
      86             : 
      87             : /*!
      88             :  * \fn CalibrationService::temperatureCalibrated
      89             :  *
      90             :  * This signal is emitted when the `Temperature` characteristic has been written succesfully.
      91             :  *
      92             :  * \see calibrateTemperature
      93             :  */
      94             : 
      95             : /*!
      96             :  * \cond internal
      97             :  * \class CalibrationServicePrivate
      98             :  *
      99             :  * The CalibrationServicePrivate class provides private implementation for CalibrationService.
     100             :  */
     101             : 
     102             : /*!
     103             :  * \internal
     104             :  * Constructs a new CalibrationServicePrivate object with public implementation \a q.
     105             :  */
     106          60 : CalibrationServicePrivate::CalibrationServicePrivate(
     107          90 :     QLowEnergyController * controller, CalibrationService * const q)
     108          90 :     : AbstractPokitServicePrivate(CalibrationService::serviceUuid, controller, q)
     109             : {
     110             : 
     111          60 : }
     112             : 
     113             : /*!
     114             :  * Returns \a value in a format Pokit devices expect. Specifically, this just enocdes \a value as
     115             :  * a 32-bit float in litte-endian byte order.
     116             :  */
     117          90 : QByteArray CalibrationServicePrivate::encodeTemperature(const float value)
     118             : {
     119             :     static_assert(sizeof(value) == 4, "Pokit devices expect 32-bit floats");
     120          90 :     QByteArray bytes(sizeof(float), '\0');
     121             :     qToLittleEndian<float>(value, bytes.data());
     122          90 :     return bytes;
     123           0 : }
     124             : 
     125             : /*!
     126             :  * Implements AbstractPokitServicePrivate::characteristicWritten to parse \a newValue, then emit a
     127             :  * specialised signal, for each supported \a characteristic.
     128             :  */
     129          18 : void CalibrationServicePrivate::characteristicWritten(const QLowEnergyCharacteristic &characteristic,
     130             :                                                  const QByteArray &newValue)
     131             : {
     132          18 :     AbstractPokitServicePrivate::characteristicWritten(characteristic, newValue);
     133             : 
     134             :     Q_Q(CalibrationService);
     135          18 :     if (characteristic.uuid() == CalibrationService::CharacteristicUuids::temperature) {
     136           0 :         emit q->temperatureCalibrated();
     137           0 :         return;
     138             :     }
     139             : 
     140          54 :     qCWarning(lc).noquote() << tr("Unknown characteristic written for Calibration service")
     141          24 :         << serviceUuid << characteristic.name() << characteristic.uuid();
     142             : }
     143             : 
     144             : /// \endcond