Added PwmWrapper class to simplify value management of each pin.

Proculite.GpioRest/Wrappers/PwmWrapper.cs

@@ -0,0 +1,64 @@
+using System.Device.Pwm.Drivers;
+
+namespace Proculite.GpioRest.Wrappers
+{
+    public class PwmWrapper
+    {
+        private readonly SoftwarePwmChannel _softwarePwmChannel;
+        private readonly ILogger? _logger;
+        public int PinNumber { get; }
+        public double Value
+        {
+            get => _softwarePwmChannel.DutyCycle;
+            set { _softwarePwmChannel.DutyCycle = value; }
+        }
+
+        public PwmWrapper(int pinNumber, ILogger? logger = null)
+        {
+            PinNumber = pinNumber;
+            _softwarePwmChannel = new SoftwarePwmChannel(pinNumber, usePrecisionTimer: true);
+            _logger = logger;
+            _softwarePwmChannel.DutyCycle = 0;
+            _softwarePwmChannel.Start();
+        }
+
+        public void SetValue(double value)
+        {
+            LogValue(value);
+            if (value < 0 || value > 1)
+            {
+                LogValueOutOfBounds();
+                return;
+            }
+
+            _softwarePwmChannel.DutyCycle = value;
+        }
+
+        public void SetHigh()
+        {
+            SetValue(1);
+        }
+
+        public void SetLow()
+        {
+            SetValue(0);
+        }
+
+        private void LogValue(double value)
+        {
+            if (_logger is null)
+                return;
+            _logger.LogDebug("New value for pin {PinNumber}: {Value}", PinNumber, value);
+        }
+
+        private void LogValueOutOfBounds()
+        {
+            if (_logger is null)
+                return;
+            _logger.LogWarning(
+                "Attempting to set value of pin {PinNumber}, but it's not between 0 and 1.",
+                PinNumber
+            );
+        }
+    }
+}