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163 pfowler 1 
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace nitdcscore {
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    public interface i2cmaster {
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        int WriteI2cData(byte address, byte[] data, uint count);
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        int ReadI2CData(byte address, ref byte[] data, uint count);
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    }
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    public class mcp23017 {
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        public byte address { get; set; }
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        private i2cmaster dev;
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        public mcp23017(i2cmaster dev, byte address) {
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            this.dev = dev;
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            this.address = address;
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        }
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        public int SetIODirection(byte gpioa, byte gpiob) {
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            byte[] data = new byte[] { 0x00, gpioa, gpiob };
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            int rslt = dev.WriteI2cData(this.addressToWrite(), data, 3);
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            return rslt;
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        }
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164 pfowler 28 
        public int SetIOPolarity(byte gpioa, byte gpiob) {
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            byte[] data = new byte[] { 0x02, gpioa, gpiob };
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            int rslt = dev.WriteI2cData(this.addressToWrite(), data, 3);
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            return rslt;
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        }
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163 pfowler 34 
        public int SetIOPullups(byte gpioa, byte gpiob) {
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            byte[] data = new byte[] { 0x0c, gpioa, gpiob };
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            int rslt = dev.WriteI2cData(this.addressToWrite(), data, 3);
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            return rslt;
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        }
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        public int GetIO(out byte[] data) {
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            int rslt = 0;
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            byte[] cmd = new byte[] { 0x12 };
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            rslt = dev.WriteI2cData(this.addressToWrite(), cmd, 1);
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            data = new byte[] { 0xff, 0xff };
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            rslt = dev.ReadI2CData(this.addressToRead(), ref data, 2);
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            return 1;
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        }
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        public int SetIO(byte gpioa, byte gpiob) {
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            int rslt = 0;
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            byte[] cmd = new byte[] { 0x12, gpioa, gpiob };
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            rslt = dev.WriteI2cData(this.addressToWrite(), cmd, 3);
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            return rslt;
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        }
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        private byte addressToWrite() {
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            byte write = (byte)(this.address << 1);
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            return write;
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        }
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        private byte addressToRead() {
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            byte read = (byte)((this.address << 1) | 0x01);
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            return read;
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        }
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    }
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}