/// <summary>
/// Reads bytes from device with passed address.
/// </summary>
/// <param name="address">The address.</param>
/// <param name="count">The count.</param>
/// <returns>
/// The read bytes.
/// </returns>
/// <exception cref="IOException">Thrown if the address could not be accessed or read.</exception>
public byte[] ReadBytes(int address, int count)
{
byte[] buf = new byte[count];
// int res= I2CNativeLib.ReadBytes(busHandle, address, buf, buf.Length);
int ret = I2CNativeLib.Ioctl(this.busHandle, I2CNativeLib.I2CSlave, address);
if (ret < 0)
{
throw new IOException(string.Format("Error accessing address '{0}'", address /*, UnixMarshal.GetErrorDescription(Stdlib.GetLastError())*/));
}
int n = I2CNativeLib.Read(this.busHandle, buf, buf.Length);
if (n <= 0)
{
throw new IOException(string.Format("Error reading from address '{0}': I2C transaction failed", address));
}
if (n < count)
{
Array.Resize(ref buf, n);
}
return(buf);
}
/// <summary>
/// Initializes a new instance of the <see cref="I2CBus"/> class.
/// </summary>
/// <param name="busPath">The bus path.</param>
/// <exception cref="IOException">Thrown if the bus could not be opened.</exception>
protected I2CBus(string busPath)
{
int ret = I2CNativeLib.Open(busPath, I2CNativeLib.OpenReadWrite);
if (ret < 0)
{
throw new IOException(string.Format("Error opening bus '{0}'", busPath /*, UnixMarshal.GetErrorDescription(Stdlib.GetLastError())*/));
}
this.busHandle = ret;
}
/// <summary>
/// .ctor
/// </summary>
/// <param name="busPath"></param>
protected I2CBus(string busPath)
{
int ret = I2CNativeLib.Open(busPath, I2CNativeLib.OPEN_READ_WRITE);
if (ret < 0)
{
throw new IOException(String.Format("Error opening bus '{0}': {1}", busPath /*, UnixMarshal.GetErrorDescription(Stdlib.GetLastError())*/));
}
busHandle = ret;
}
protected virtual void Dispose(bool disposing)
{
if (disposing)
{
// disposing managed resouces
}
if (this.busHandle != 0)
{
I2CNativeLib.Close(this.busHandle);
this.busHandle = 0;
}
}
/// <summary>
/// Writes array of bytes.
/// </summary>
/// <param name="address">Address of a destination device</param>
/// <param name="bytes">The bytes.</param>
/// <exception cref="IOException">Thrown when address cannot be accessed or data cannot be written.</exception>
/// <remarks>
/// Do not write more than 3 bytes at once, RPi drivers don't support this currently.
/// </remarks>
public void WriteBytes(int address, byte[] bytes)
{
int ret = I2CNativeLib.Ioctl(this.busHandle, I2CNativeLib.I2CSlave, address);
if (ret < 0)
{
throw new IOException(string.Format("Error accessing address '{0}'", address /*, UnixMarshal.GetErrorDescription(Stdlib.GetLastError())*/));
}
ret = I2CNativeLib.Write(this.busHandle, bytes, bytes.Length);
if (ret < 0)
{
throw new IOException(string.Format("Error writing to address '{0}': I2C transaction failed", address));
}
}
