added address calculator for SC16IS7x2

WildernessLabs · Jan 8, 2025 · d36308f · d36308f
1 parent d5ead53
commit d36308f
Showing 1 changed file with 76 additions and 1 deletion.
diff --git a/Source/Meadow.Foundation.Peripherals/ICs.IOExpanders.Sc16is7x2/Driver/Sc16is7x2.Enums.cs b/Source/Meadow.Foundation.Peripherals/ICs.IOExpanders.Sc16is7x2/Driver/Sc16is7x2.Enums.cs
@@ -1,7 +1,82 @@
-namespace Meadow.Foundation.ICs.IOExpanders
+using System;
+
+namespace Meadow.Foundation.ICs.IOExpanders
 {
     public partial class Sc16is7x2
     {
+        /// <summary>
+        /// Address pin connection used for calculating peripherla addresses
+        /// </summary>
+        public enum AddressConnection
+        {
+            /// <summary>
+            /// Address pin tied to VDD
+            /// </summary>
+            VDD,
+            /// <summary>
+            /// Address pin tied to GND
+            /// </summary>
+            GND,
+            /// <summary>
+            /// Address pin tied to SCL
+            /// </summary>
+            SCL,
+            /// <summary>
+            /// Address pin tied to SDA
+            /// </summary>
+            SDA
+        }
+
+        /// <summary>
+        /// Calculates a bus address based on the connection of the address pins
+        /// </summary>
+        /// <param name="a0">A0's pin connection</param>
+        /// <param name="a1">A1's pin connection</param>
+        public static Addresses CalculateAddress(AddressConnection a0, AddressConnection a1)
+        {
+            switch (a1)
+            {
+                case AddressConnection.VDD:
+                    switch (a0)
+                    {
+                        case AddressConnection.VDD: return Addresses.Address_0x48;
+                        case AddressConnection.GND: return Addresses.Address_0x49;
+                        case AddressConnection.SCL: return Addresses.Address_0x4A;
+                        case AddressConnection.SDA: return Addresses.Address_0x4B;
+                    }
+                    break;
+                case AddressConnection.GND:
+                    switch (a0)
+                    {
+                        case AddressConnection.VDD: return Addresses.Address_0x4C;
+                        case AddressConnection.GND: return Addresses.Address_0x4D;
+                        case AddressConnection.SCL: return Addresses.Address_0x4E;
+                        case AddressConnection.SDA: return Addresses.Address_0x4F;
+                    }
+                    break;
+                case AddressConnection.SCL:
+                    switch (a0)
+                    {
+                        case AddressConnection.VDD: return Addresses.Address_0x50;
+                        case AddressConnection.GND: return Addresses.Address_0x51;
+                        case AddressConnection.SCL: return Addresses.Address_0x52;
+                        case AddressConnection.SDA: return Addresses.Address_0x53;
+                    }
+                    break;
+                case AddressConnection.SDA:
+                    switch (a0)
+                    {
+                        case AddressConnection.VDD: return Addresses.Address_0x54;
+                        case AddressConnection.GND: return Addresses.Address_0x55;
+                        case AddressConnection.SCL: return Addresses.Address_0x56;
+                        case AddressConnection.SDA: return Addresses.Address_0x57;
+                    }
+                    break;
+            }
+
+            throw new ArgumentException();
+        }
+
         /// <summary>
         /// The list of possible I2C addresses for the peripheral
         /// </summary>