Add As1115 driver, sample and datasheet

Source/Meadow.Foundation.Peripherals/ICs.IOExpanders.As1115/Driver/As1115.Enums.cs

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+namespace Meadow.Foundation.ICs.IOExpanders
+{
+    public partial class As1115
+    {
+        /// <summary>
+        /// Valid addresses for the sensor.
+        /// </summary>
+        public enum Addresses : byte
+        {
+            /// <summary>
+            /// Bus address 0x00
+            /// </summary>
+            Address_0x00 = 0x00,
+            /// <summary>
+            /// Default bus address
+            /// </summary>
+            Default = Address_0x00
+        }
+
+        /// <summary>
+        /// The decode mode used for displaying pixels or characters
+        /// </summary>
+        public enum DecodeMode : byte
+        {
+            /// <summary>
+            /// Hexicemial charcter encoding  for 7-segment displays
+            /// characters 0 to 9, E, H, L, P, and -
+            /// </summary>
+            //Hexidecimal,
+            /// <summary>
+            /// BCD character encoding for 7-segment displays
+            ///  characters 0 to 9 and A to F
+            /// </summary>
+            //BCD,
+            /// <summary>
+            /// Direct pixel mapping for 8x8 matrix displays (default)
+            /// </summary>
+            Pixel,
+        }
+
+        /// <summary>
+        /// Key scan buttons
+        /// </summary>
+        public enum KeyScanButtonType : byte
+        {
+            /// <summary>
+            /// Button 1 
+            /// Key A: 127, Key B: 255
+            /// </summary>
+            Button1,
+            /// <summary>
+            /// Button 2
+            /// Key A: 191, Key B: 255
+            /// </summary>
+            Button2,
+            /// <summary>
+            /// Button 3
+            /// Key A: 223, Key B: 255
+            /// </summary>
+            Button3,
+            /// <summary>
+            /// Button 4
+            /// Key A: 239, Key B: 255
+            /// </summary>
+            Button4,
+            /// <summary>
+            /// Button 5
+            /// Key A: 247, Key B: 255
+            /// </summary>
+            Button5,
+            /// <summary>
+            /// Button 6
+            /// Key A: 251, Key B: 255
+            /// </summary>
+            Button6,
+            /// <summary>
+            /// Button 7
+            /// Key A: 253, Key B: 255
+            /// </summary>
+            Button7,
+            /// <summary>
+            /// Button 8
+            /// Key A: 254, Key B: 255
+            /// </summary>
+            Button8,
+            /// <summary>
+            /// Button 9
+            /// Key A: 255, Key B: 127
+            /// </summary>
+            Button9,
+            /// <summary>
+            /// Button 10
+            /// Key A: 255, Key B: 191
+            /// </summary>
+            Button10,
+            /// <summary>
+            /// Button 11
+            /// Key A: 255, Key B: 223
+            /// </summary>
+            Button11,
+            /// <summary>
+            /// Button 11
+            /// Key A: 255, Key B: 239
+            /// </summary>
+            Button12,
+            /// <summary>
+            /// Button 12
+            /// Key A: 255, Key B: 247
+            /// </summary>
+            Button13,
+            /// <summary>
+            /// Button 13
+            /// Key A: 255, Key B: 251
+            /// </summary>
+            Button14,
+            /// <summary>
+            /// Button 15
+            /// Key A: 255, Key B: 253
+            /// </summary>
+            Button15,
+            /// <summary>
+            /// Button 16
+            /// Key A: 255, Key B: 254
+            /// </summary>
+            Button16,
+            /// <summary>
+            /// No button pressed or selected
+            /// </summary>
+            None,
+        }
+    }
+}

Source/Meadow.Foundation.Peripherals/ICs.IOExpanders.As1115/Driver/As1115.Registers.cs

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+namespace Meadow.Foundation.ICs.IOExpanders
+{
+    public partial class As1115
+    {
+        const byte REG_DIGIT0 = 0x01;
+        const byte REG_DIGIT1 = 0x02;
+        const byte REG_DIGIT2 = 0x03;
+        const byte REG_DIGIT3 = 0x04;
+        const byte REG_DIGIT4 = 0x05;
+        const byte REG_DIGIT5 = 0x06;
+        const byte REG_DIGIT6 = 0x07;
+        const byte REG_DIGIT7 = 0x08;
+
+        const byte REG_DECODE_MODE = 0x09;
+        const byte REG_GLOBAL_INTEN = 0x0A;
+        const byte REG_SCAN_LIMIT = 0x0B;
+        const byte REG_SHUTDOWN = 0x0C;
+        const byte REG_SELF_ADDR = 0x2D;
+        const byte REG_FEATURE = 0x0E;
+        const byte REG_DISP_TEST = 0x0F;
+
+        const byte REG_DIGIT01_INTEN = 0x10;
+        const byte REG_DIGIT23_INTEN = 0x11;
+        const byte REG_DIGIT45_INTEN = 0x12;
+        const byte REG_DIGIT67_INTEN = 0x13;
+
+        const byte REG_DIGIT0_DIAG = 0x14;
+        const byte REG_DIGIT1_DIAG = 0x15;
+        const byte REG_DIGIT2_DIAG = 0x16;
+        const byte REG_DIGIT3_DIAG = 0x17;
+        const byte REG_DIGIT4_DIAG = 0x18;
+        const byte REG_DIGIT5_DIAG = 0x19;
+        const byte REG_DIGIT6_DIAG = 0x1A;
+        const byte REG_DIGIT7_DIAG = 0x1B;
+
+        const byte REG_KEYA = 0x1C;
+        const byte REG_KEYB = 0x1D;
+
+        const byte DECODE_RAW = 0x00;
+        const byte DECODE_FONT = 0x01;
+        const byte DECODE_ALL_RAW = 0x00;
+        const byte DECODE_ALL_FONT = 0xFF;
+
+        const byte FONT_CODEB = 0x00;
+        const byte FONT_HEX = 0x01;
+
+        const byte REG_FEATURE_EXTCLK = 0x00;
+        const byte REG_FEATURE_RESET = 0x01;
+        const byte REG_FEATURE_FONT = 0x02;
+        const byte REG_FEATURE_BLINK = 0x04;
+        const byte REG_FEATURE_BLINKFREQ = 0x05;
+        const byte REG_FEATURE_BLINKSYNC = 0x06;
+        const byte REG_FEATURE_BLINKSTART = 0x07;
+
+        const byte REG_SHUTDOWN_SHUTDOWN = 0x00;
+        const byte REG_SHUTDOWN_RUNNING = 0x01;
+        const byte REG_SHUTDOWN_RESET_FEATUREREG = 0x00;
+        const byte REG_SHUTDOWN_PRESERVE_FEATUREREG = 0x80;
+
+        const byte DP_OFF = 0x00;
+        const byte DP_ON = 0x01;
+    }
+}