public byte[] ReadDeviceRegister(int address, byte register)
{
byte[] buf = new byte[10];
int res = I2CNativeLib.readRegister(busHandle, address, register, buf);
return(buf);
}
/// <summary>
/// .ctor
/// </summary>
/// <param name="busPath"></param>
protected I2CBus(string busPath)
{
int res = I2CNativeLib.OpenBus(busPath);
if (res < 0)
{
throw new IOException(/*String.Format("Error opening bus '{0}': {1}", busPath, UnixMarshal.GetErrorDescription(Stdlib.GetLastError()))*/);
}
busHandle = res;
}
protected virtual void Dispose(bool disposing)
{
if (disposing)
{
// disposing managed resouces
}
if (busHandle != 0)
{
I2CNativeLib.CloseBus(busHandle);
busHandle = 0;
}
}
/// <summary>
/// Writes array of bytes.
/// </summary>
/// <remarks>Do not write more than 3 bytes at once, RPi drivers don't support this currently.</remarks>
/// <param name="address">Address of a destination device</param>
/// <param name="bytes"></param>
public void WriteBytes(int address, byte[] bytes)
{
int res = I2CNativeLib.WriteBytes(busHandle, address, bytes, bytes.Length);
if (res == -1)
{
throw new IOException(/*String.Format("Error accessing address '{0}': {1}", address, UnixMarshal.GetErrorDescription(Stdlib.GetLastError()))*/);
}
// HACK: removing res== -2 check because it was disrupting communications
if (res == -2)
{
throw new IOException(String.Format("Error writing to address '{0}': I2C transaction failed", address));
}
}
/// <summary>
/// Reads bytes from device with passed address.
/// </summary>
/// <param name="address"></param>
/// <param name="count"></param>
/// <returns></returns>
public byte[] ReadBytes(int address, int count)
{
byte[] buf = new byte[count];
int res = I2CNativeLib.ReadBytes(busHandle, address, buf, buf.Length);
if (res == -1)
{
throw new IOException(/*String.Format("Error accessing address '{0}': {1}", address, UnixMarshal.GetErrorDescription(Stdlib.GetLastError()))*/);
}
if (res <= 0)
{
throw new IOException(String.Format("Error reading from address '{0}': I2C transaction failed", address));
}
if (res < count)
{
Array.Resize(ref buf, res);
}
return(buf);
}
