Subversion Repositories group.electronics

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace nitdcscore {

    public interface i2cmaster {

        int WriteI2cData(byte address, byte[] data, uint count);

        int ReadI2CData(byte address, ref byte[] data, uint count);

    }

    public class mcp23017 {

        public byte address { get; set; }

        private i2cmaster dev;

        public mcp23017(i2cmaster dev, byte address) {

            this.dev = dev;

            this.address = address;

        }

        public int SetIODirection(byte gpioa, byte gpiob) {

            byte[] data = new byte[] { 0x00, gpioa, gpiob };

            int rslt = dev.WriteI2cData(this.addressToWrite(), data, 3);

            return rslt;

        }

        public int SetIOPullups(byte gpioa, byte gpiob) {

            byte[] data = new byte[] { 0x0c, gpioa, gpiob };

            int rslt = dev.WriteI2cData(this.addressToWrite(), data, 3);

            return rslt;

        }

        public int GetIO(out byte[] data) {

            int rslt = 0;

            byte[] cmd = new byte[] { 0x12 };

            rslt = dev.WriteI2cData(this.addressToWrite(), cmd, 1);

            data = new byte[] { 0xff, 0xff };

            rslt = dev.ReadI2CData(this.addressToRead(), ref data, 2);

            return 1;

        }

        public int SetIO(byte gpioa, byte gpiob) {

            int rslt = 0;

            byte[] cmd = new byte[] { 0x12, gpioa, gpiob };

            rslt = dev.WriteI2cData(this.addressToWrite(), cmd, 3);

            return rslt;

        }

        private byte addressToWrite() {

            byte write = (byte)(this.address << 1);

            return write;

        }

        private byte addressToRead() {

            byte read = (byte)((this.address << 1) | 0x01);

            return read;

        }

    }

}