From 4b769ff862fe6aa5b1a0582750250d0cc950201e Mon Sep 17 00:00:00 2001
From: Derek Smithson <derek.smithson@knightware.net>
Date: Tue, 11 Apr 2023 21:49:45 -0700
Subject: [PATCH] fix: catching display init error when not available

---
 .gitignore                                    |  2 ++
 .../Models/DisplayRepository.cs               | 36 +++++++++++++------
 .../Models/RelayRepository.cs                 | 24 ++++++++++---
 3 files changed, 47 insertions(+), 15 deletions(-)

diff --git a/.gitignore b/.gitignore
index 0969583..0d55e56 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,6 +10,8 @@
 # User-specific files (MonoDevelop/Xamarin Studio)
 *.userprefs
 
+.vscode/
+
 # Build results
 [Dd]ebug/
 [Dd]ebugPublic/
diff --git a/src/Linux/SpyderTallyControllerLinux/SpyderTallyControllerWebApp/Models/DisplayRepository.cs b/src/Linux/SpyderTallyControllerLinux/SpyderTallyControllerWebApp/Models/DisplayRepository.cs
index 6e05104..3954026 100644
--- a/src/Linux/SpyderTallyControllerLinux/SpyderTallyControllerWebApp/Models/DisplayRepository.cs
+++ b/src/Linux/SpyderTallyControllerLinux/SpyderTallyControllerWebApp/Models/DisplayRepository.cs
@@ -32,20 +32,31 @@ public class DisplayRepository : IDisplayRepository
 
         public DisplayRepository(IRelayRepository relayRepository)
         {
+            try
+            {
+                //Initialize our display
+                i2c = I2cDevice.Create(new I2cConnectionSettings(1, 0x27));
+                driver = new Pcf8574(i2c);
+                lcd = new Lcd1602(registerSelectPin: 0,
+                    enablePin: 2,
+                    dataPins: new int[] { 4, 5, 6, 7 },
+                    backlightPin: 3,
+                    backlightBrightness: 0.1f,
+                    readWritePin: 1,
+                    controller: new GpioController(PinNumberingScheme.Logical, driver));
+            }
+            catch(Exception ex)
+            {
+                i2c = null;
+                driver = null;
+                lcd = null;
+                Console.WriteLine($"{ex.GetType().Name} occurred while trying to open display: {ex.Message}.  Display will be unavailable");
+                return;
+            }
+            
             this.relayRepository = relayRepository;
             this.relayRepository.RelayStatusChanged += RelayRepository_RelayStatusChanged;
 
-            //Initialize our display
-            i2c = I2cDevice.Create(new I2cConnectionSettings(1, 0x27));
-            driver = new Pcf8574(i2c);
-            lcd = new Lcd1602(registerSelectPin: 0,
-                enablePin: 2,
-                dataPins: new int[] { 4, 5, 6, 7 },
-                backlightPin: 3,
-                backlightBrightness: 0.1f,
-                readWritePin: 1,
-                controller: new GpioController(PinNumberingScheme.Logical, driver));
-
             //Create filled 0 charcater
             byte[] filledCircle = new byte[]
             {
@@ -119,6 +130,9 @@ public void SetText(string line1, string line2)
 
         public void UpdateDisplay(bool blinkCursorOnly = false)
         {
+            if(lcd == null)
+                return;
+
             lock (displayLock)
             {
               if (!blinkCursorOnly)
diff --git a/src/Linux/SpyderTallyControllerLinux/SpyderTallyControllerWebApp/Models/RelayRepository.cs b/src/Linux/SpyderTallyControllerLinux/SpyderTallyControllerWebApp/Models/RelayRepository.cs
index 9ca8881..d2af692 100644
--- a/src/Linux/SpyderTallyControllerLinux/SpyderTallyControllerWebApp/Models/RelayRepository.cs
+++ b/src/Linux/SpyderTallyControllerLinux/SpyderTallyControllerWebApp/Models/RelayRepository.cs
@@ -20,11 +20,27 @@ public RelayRepository(IConfigurationRepository configurationRepository)
 
             relayStatus = new bool[deviceConfiguration.TallyCount];
 
-            //Initialize GPIO pins
-            gpioController = new GpioController();
-            foreach(var gpioPin in deviceConfiguration.TallyGpioPinAssignments)
+            // Initialize GPIO pins
+            try
             {
-                gpioController.OpenPin(gpioPin.Value, PinMode.Output, PinValue.Low);
+                gpioController = new GpioController();
+                foreach (var gpioPin in deviceConfiguration.TallyGpioPinAssignments)
+                {
+                    try
+                    {
+                        gpioController.OpenPin(gpioPin.Value, PinMode.Output, PinValue.Low);
+                    }
+                    catch (Exception ex)
+                    {
+                        Console.WriteLine($"Failed to open and configure GPIO pin {gpioPin.Value}: {ex.Message}");
+                        // Handle the situation when a specific GPIO pin fails to open, e.g., continue without it
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"Failed to initialize GpioController: {ex.Message}");
+                // Handle the situation when GpioController fails to initialize, e.g., continue without GPIO control
             }
         }