Reply To: I2C communication PCF8574AP

[Bartłomiej Drozd]

sorry, i don’t know how to read a register… in NXC i did it that:

void writeReg(byte reg)
{
 byte buff[] = {0x70, 0x00};
 buff[1] = reg;
 int nbytes;
 I2CWrite(I2C, 0, buff);
 while(I2CStatus(I2C, nbytes) == STAT_COMM_PENDING);
 Wait(100);
}

because i need only outputs and that is working fine, but i need it in C# on EV3. Maybe i’m doing something wrong? Here is my code…
Main.cs

using System;
using System.Threading;
using MonoBrickFirmware;
using MonoBrickFirmware.Display.Dialogs;
using MonoBrickFirmware.Display;
using MonoBrickFirmware.Sensors;
using MonoBrickFirmware.UserInput;

namespace test
{
	class MainClass
	{
		public static void Main (string[] args)
		{
			EventWaitHandle stopped = new ManualResetEvent (false);
			ButtonEvents btn = new ButtonEvents ();
			byte address = 0x70;
			byte[] data1 = new byte[8] {1, 1, 1, 1, 1, 1, 1, 1};
			byte[] data0 = new byte[8] {0, 0, 0, 0, 0, 0, 0, 0};
			LcdConsole.WriteLine ("hello world!");
			pcf pcf = new pcf (SensorPort.In1, address);
			btn.EscapePressed += () => {
				LcdConsole.WriteLine("stopped");
				stopped.Set ();
			};
			btn.LeftPressed += () => {
				pcf.WriteReg(0, data1);
				LcdConsole.WriteLine("write data1");
			};
			btn.RightPressed += () => {
				pcf.WriteReg(0, data0);
				LcdConsole.WriteLine("write data0");
			};
			stopped.WaitOne ();
		}
	}
}

pcf.cs

using System;
using MonoBrickFirmware;
using MonoBrickFirmware.Sensors;

namespace test
{
	public class pcf : I2CSensor
	{
		public pcf (SensorPort Port, byte adress) : base (Port, adress, I2CMode.LowSpeed)
		{
			base.Initialise();
		}

		public byte[] ReadReg(byte Register, byte Length)
		{
			return base.ReadRegister(Register, Length);
		}

		public void WriteReg(byte Register, byte[] Data)
		{
			base.WriteRegister(Register, Data);
		}

		public byte[] ReadAndWriteReg(byte Register, byte[] Data, int rxLength)
		{
			return base.WriteAndRead(Register, Data, rxLength);
		}

		public override string ReadAsString()
		{
			throw new NotImplementedException();
		}

		public override void SelectNextMode()
		{
			throw new NotImplementedException ();
		}

		public override string GetSensorName()
		{
			return "PCF8574AP";
		}

		public override void SelectPreviousMode()
		{
			throw new NotImplementedException ();
		}

		public override int NumberOfModes()
		{
			return 0;
		}

		public override string SelectedMode()
		{
			return "0";
		}
	}
}