Dfyjkt

I Wrote a program to read registers from the port expander PCA9555 using Mono. How can I set the port 0 and port 1 as inputs?
So when I use I2c-detect i see the chip on 0x18 address:

]1

Code on C#:

/// <summary>
/// MODE_AUTO 0
/// MODE_QUICK 1
/// MODE_READ 2 - 
/// MODE_FUNC 3 - 'V': version = 1; 'y': yes = 1; 'l': device list = 1; 
/// </summary>
class Program

 private const int AutoMode = 0;
 private const int QuickMode = 1;
 private const int OpenReadAndWriteMode = 2;
 private const int I2cToolsFunctionMode = 3;
 //private static int DeviceAddress = 0x0703;
 private static int DeviceAddress = 0x20;

 [DllImport("libc.so.6", EntryPoint = "open")]
 public static extern int Open(string fileName, int mode);

 [DllImport("libc.so.6", EntryPoint = "ioctl", SetLastError = true)]
 private extern static int Ioctl(int fd, int request, int data);

 [DllImport("libc.so.6", EntryPoint = "read", SetLastError = true)]
 internal static extern int Read(int handle, byte data, int length);

 static void Main(string args)
 
 var logger = NLog.LogManager.GetCurrentClassLogger();

 Console.WriteLine("################ I2C test application ################n");

 // read from I2C device bus 1
 try
 
 var i2cBushandle = Open("/dev/i2c-2", OpenReadAndWriteMode);
 // open the slave device at address 0x48 for communication

 int registerAddress = 0x00;
 var deviceReturnCode = Ioctl(i2cBushandle, DeviceAddress, registerAddress);

 // read the first two bytes from the device into an array
 var deviceDataInMemory = new byte[2];
 Read(i2cBushandle, deviceDataInMemory, deviceDataInMemory.Length);

 for (int i = 0; i < deviceDataInMemory.Length; i++)
 
 Console.Write($"deviceDataInMemory[i] ");
 

 Console.WriteLine();
 Console.WriteLine("Done!" + "Device code" + deviceReturnCode);
 Console.WriteLine($"Most significant byte = deviceDataInMemory[0]");
 Console.WriteLine($"Least significant byte = deviceDataInMemory[1]");
 
 catch (Exception exception)
 
 Console.WriteLine($"Error! exception.Message");
 logger.Debug($"Error! exception.Message");
 logger.Info($"Error! exception.Message");
 

 Console.ReadKey();
 

When I run application on RPi I get only 255 values:

But on screen bytes are different. I dont know how I should configure chip and read it. I would appreciate for any help.