Feature/sc16is

Source/Meadow.Foundation.Peripherals/ICs.ADC.Ads1x15/Driver/Ads1x15Base.Enums.cs

@@ -35,27 +35,27 @@ public enum Addresses : byte
         public enum FsrGain
         {
             /// <summary>
-            /// 2/3rds
+            /// Gain = 2/3rds. Range: ±6.144 V
             /// </summary>
             TwoThirds = 0x00,
             /// <summary>
-            /// 1
+            /// Gain = 1. Range: ±4.096 V
             /// </summary>
             One = 0x01,
             /// <summary>
-            /// 2
+            /// Gain = 2. Range: ±2.048 V
             /// </summary>
             Two = 0x02,
             /// <summary>
-            /// 4
+            /// Gain = 4. Range: ±1.024 V
             /// </summary>
             Four = 0x03,
             /// <summary>
-            /// 8
+            /// Gain = 8. Range: ±0.512 V
             /// </summary>
             Eight = 0x04,
             /// <summary>
-            /// 16
+            /// Gain = 16. Range: ±0.256 V
             /// </summary>
             Sixteen = 0x05
         }

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>

Source/Meadow.Foundation.Peripherals/ICs.IOExpanders.Sc16is7x2/Driver/Sc16is7x2.I2c.cs

@@ -29,6 +29,7 @@ public Sc16is7x2(II2cBus i2cBus, Frequency oscillatorFrequency, Addresses addres
             : this(oscillatorFrequency, irq, latchGpioInterrupt)
         {
             _i2cComms = new I2cCommunications(i2cBus, (byte)address);
+            Reset();
         }
     }
-}
+}