make BME68x and BMI270 sleep-aware

Source/Meadow.Foundation.Core/PollingSensorBase.cs

@@ -27,7 +27,7 @@ public override void StartUpdating(TimeSpan? updateInterval = null)
         {
             lock (samplingLock)
             {
-                if (IsSampling) { return; }
+                if (IsSampling && updateInterval == UpdateInterval) { return; }
 
                 IsSampling = true;
 

Source/Meadow.Foundation.Peripherals/Sensors.Atmospheric.Bme68x/Driver/Bme68x.cs

@@ -23,12 +23,13 @@ public abstract partial class Bme68x :
                             RelativeHumidity? Humidity,
                             Pressure? Pressure,
                             Resistance? GasResistance)>,
-        ITemperatureSensor, IHumiditySensor, IBarometricPressureSensor, IGasResistanceSensor, ISpiPeripheral, II2cPeripheral, IDisposable
+        ITemperatureSensor, IHumiditySensor, IBarometricPressureSensor, IGasResistanceSensor, ISpiPeripheral, II2cPeripheral, ISleepAwarePeripheral, IDisposable
     {
         private event EventHandler<IChangeResult<Units.Temperature>> _temperatureHandlers = default!;
         private event EventHandler<IChangeResult<RelativeHumidity>> _humidityHandlers = default!;
         private event EventHandler<IChangeResult<Pressure>> _pressureHandlers = default!;
         private event EventHandler<IChangeResult<Resistance>> _gasResistanceHandlers = default!;
+        private PowerMode _lastRunningPowerMode;
 
         /// <summary>
         /// The temperature oversampling mode
@@ -373,6 +374,7 @@ public void SetPowerMode(PowerMode powerMode)
             byte mask = 0x03;
             status = (byte)((status & (byte)~mask) | (byte)powerMode);
             busComms.WriteRegister((byte)Registers.CTRL_MEAS, status);
+            _lastRunningPowerMode = powerMode;
         }
 
         /// <summary>
@@ -675,5 +677,19 @@ async Task<Pressure> ISensor<Pressure>.Read()
 
         async Task<Resistance> ISensor<Resistance>.Read()
             => (await Read()).GasResistance!.Value;
+
+        /// <inheritdoc/>
+        public Task BeforeSleep(CancellationToken cancellationToken)
+        {
+            SetPowerMode(PowerMode.Sleep);
+            return Task.CompletedTask;
+        }
+
+        /// <inheritdoc/>
+        public Task AfterWake(CancellationToken cancellationToken)
+        {
+            SetPowerMode(_lastRunningPowerMode);
+            return Task.CompletedTask;
+        }
     }
 }

Source/Meadow.Foundation.Peripherals/Sensors.Motion.Bmi270/Driver/Bmi270.cs

@@ -14,27 +14,12 @@
     /// </summary>
     public partial class Bmi270 :
         PollingSensorBase<(Acceleration3D? Acceleration3D, AngularVelocity3D? AngularVelocity3D, Units.Temperature? Temperature)>,
-        II2cPeripheral, IGyroscope, IAccelerometer, ITemperatureSensor
+        II2cPeripheral, IGyroscope, IAccelerometer, ITemperatureSensor, ISleepAwarePeripheral
     {
         private event EventHandler<IChangeResult<AngularVelocity3D>> _angularVelocityHandlers = default!;
         private event EventHandler<IChangeResult<Acceleration3D>> _accelerationHandlers = default!;
         private event EventHandler<IChangeResult<Units.Temperature>> _temperatureHandlers = default!;
 
-        /// <summary>
-        /// Event raised when linear acceleration changes
-        /// </summary>
-        public event EventHandler<IChangeResult<Acceleration3D>> Acceleration3DUpdated = default!;
-
-        /// <summary>
-        /// Event raised when angular velocity (gyro) changes
-        /// </summary>
-        public event EventHandler<IChangeResult<AngularVelocity3D>> AngularVelocity3DUpdated = default!;
-
-        /// <summary>
-        /// Event raised when temperature changes
-        /// </summary>
-        public event EventHandler<IChangeResult<Units.Temperature>> TemperatureUpdated = default!;
-
         /// <summary>
         /// Current Acceleration 3D
         /// </summary>
@@ -186,17 +171,20 @@
         /// <param name="changeResult">The updated sensor data</param>
         protected override void RaiseEventsAndNotify(IChangeResult<(Acceleration3D? Acceleration3D, AngularVelocity3D? AngularVelocity3D, Units.Temperature? Temperature)> changeResult)
         {
+            Resolver.Log.Info($"RaiseAndNotify");
+
             if (changeResult.New.AngularVelocity3D is { } angular)
             {
-                AngularVelocity3DUpdated?.Invoke(this, new ChangeResult<AngularVelocity3D>(angular, changeResult.Old?.AngularVelocity3D));
+                _angularVelocityHandlers?.Invoke(this, new ChangeResult<AngularVelocity3D>(angular, changeResult.Old?.AngularVelocity3D));
             }
             if (changeResult.New.Acceleration3D is { } accel)
             {
-                Acceleration3DUpdated?.Invoke(this, new ChangeResult<Acceleration3D>(accel, changeResult.Old?.Acceleration3D));
+                Resolver.Log.Info($"RaiseAndNotify Acceleration");
+                _accelerationHandlers?.Invoke(this, new ChangeResult<Acceleration3D>(accel, changeResult.Old?.Acceleration3D));
             }
             if (changeResult.New.Temperature is { } temp)
             {
-                TemperatureUpdated?.Invoke(this, new ChangeResult<Units.Temperature>(temp, changeResult.Old?.Temperature));
+                _temperatureHandlers?.Invoke(this, new ChangeResult<Units.Temperature>(temp, changeResult.Old?.Temperature));
             }
             base.RaiseEventsAndNotify(changeResult);
         }
@@ -336,5 +324,19 @@
 
         async Task<Units.Temperature> ISensor<Units.Temperature>.Read()
             => (await Read()).Temperature!.Value;
+
+        /// <inheritdoc/>
+        public Task BeforeSleep(CancellationToken cancellationToken)
+        {
+            SetPowerMode(PowerMode.Suspend);
+            return Task.CompletedTask;
+        }
+
+        /// <inheritdoc/>
+        public Task AfterWake(CancellationToken cancellationToken)
+        {
+            SetPowerMode(PowerMode.Normal);
+            return Task.CompletedTask;
+        }
     }
 }