Reworked code to use PwmWrapper instead of GpioService.

Proculite.GpioRest/Models/PinValueModel.cs

@@ -3,12 +3,10 @@ using System.Text.Json.Serialization;
 
 namespace Proculite.GpioRest.Models
 {
-    public class PinValueModel(int pinNumber, PinValue pinValue)
+    public class PinValueModel(int pinNumber, double value)
     {
         public int PinNumber { get; set; } = pinNumber;
 
-        [JsonIgnore]
+        public double PinValue { get; set; } = value;
-        public PinValue PinValue { get; set; } = pinValue;
-        public int Value => PinValue == PinValue.High ? 1 : 0;
     }
 }

Proculite.GpioRest/Proculite.GpioRest.csproj

@@ -7,6 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="Iot.Device.Bindings" Version="3.2.0" />
     <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="8.0.7" />
     <PackageReference Include="Swashbuckle.AspNetCore" Version="6.4.0" />
     <PackageReference Include="System.Device.Gpio" Version="3.2.0" />

Proculite.GpioRest/Services/GpioService.cs

@@ -1,5 +1,6 @@
 using System.Device.Gpio;
 using Proculite.GpioRest.Models;
+using Proculite.GpioRest.Wrappers;
 
 namespace Proculite.GpioRest.Services
 {
@@ -7,7 +8,7 @@ namespace Proculite.GpioRest.Services
     {
         public readonly ILogger<GpioService> _logger;
         private readonly int[] _pins;
-        private readonly GpioController _gpioController;
+        private readonly Dictionary<int, PwmWrapper> _pwmPins;
 
         public GpioService(ILogger<GpioService> logger, IConfiguration configuration)
         {
@@ -18,7 +19,6 @@ namespace Proculite.GpioRest.Services
                 .Select(pin => pin.Get<int>())
                 .ToArray();
 
-            _gpioController = new GpioController();
             SetupPins();
         }
 
@@ -29,29 +29,18 @@ namespace Proculite.GpioRest.Services
 
             foreach (var pin in _pins)
             {
-                if (_gpioController.IsPinOpen(pin))
+                _pwmPins[pin] = new PwmWrapper(pin);
-                {
-                    _logger.LogWarning("Pin number {Pin} is already open.", pin);
-                    continue;
-                }
-
-                if (!_gpioController.IsPinModeSupported(pin, pinMode))
-                {
-                    _logger.LogWarning("Pin number {Pin} does not support {PinMode}", pin, pinMode);
-                }
-
-                _gpioController.OpenPin(pin, pinMode, PinValue.Low);
             }
         }
 
-        public PinValue CurrentPinValue(int pinNumber)
+        public PinValueModel CurrentPinValue(int pinNumber)
         {
-            return _gpioController.Read(pinNumber);
+            return new PinValueModel(pinNumber, _pwmPins[pinNumber].Value);
         }
 
         public PinValueModel PinValueModelOfPin(int pinNumber)
         {
-            return new PinValueModel(pinNumber, _gpioController.Read(pinNumber));
+            return new PinValueModel(pinNumber, _pwmPins[pinNumber].Value);
         }
 
         public PinValueModel[] StateOfAllPins()
@@ -61,19 +50,18 @@ namespace Proculite.GpioRest.Services
 
         public void SetPinHigh(int pinNumber)
         {
-            _gpioController.Write(pinNumber, PinValue.High);
+            _pwmPins[pinNumber].SetHigh();
         }
 
         public void SetPinLow(int pinNumber)
         {
-            _gpioController.Write(pinNumber, PinValue.Low);
+            _pwmPins[pinNumber].SetLow();
         }
 
         public void TogglePin(int pinNumber)
         {
-            PinValue currentValue = CurrentPinValue(pinNumber);
+            double currentValue = _pwmPins[pinNumber].Value;
-            PinValue newValue = currentValue == PinValue.High ? PinValue.Low : PinValue.High;
+            _pwmPins[pinNumber].Value = currentValue > 0 ? 0 : 1;
-            _gpioController.Write(pinNumber, newValue);
         }
 
         public PinValueModel SetPinHighReturning(int pinNumber)

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
+            );
+        }
+    }
+}