public void Dispose()
{
if (_deviceHandle >= 0)
{
LibcWrapper.Close(_deviceHandle);
}
}
/// <summary>
/// Writes to I2C
/// </summary>
/// <param name="data">data to write to I2C</param>
/// <param name="length">nr of bytes to write</param>
public void Write(byte[] data, int length)
{
if (length < 1 || length > maxBufferLength)
{
throw new Exception("Length is out of bounds");
}
var writeOp = LibcWrapper.Write(_deviceHandle, data, length);
if (writeOp != length)
{
throw new Exception($"Write error. Returned: {writeOp}, expected: {length}");
}
}
/// <summary>
/// Initializes I2C device
/// </summary>
/// <param name="devicePath">path to I2C device. Like "/dev/i2c-1"</param>
/// <param name="deviceAddress">I2C address. Like "0x48"</param>
public I2CDevice(string devicePath, int deviceAddress)
{
_deviceHandle = LibcWrapper.Open(devicePath, (int)LibcConstants.OpenFileMode.O_RDWR);
if (_deviceHandle < 0)
{
throw new Exception($"Can't open '{devicePath}'. Returned {_deviceHandle}");
}
var deviceReturnCode = LibcWrapper.Ioctl(_deviceHandle, (int)LibcConstants.I2CMode.I2C_SLAVE, deviceAddress);
if (deviceReturnCode < 0)
{
throw new Exception($"Can't set I2C address. Returned {deviceReturnCode}");
}
}
/// <summary>
/// Reads from I2C
/// </summary>
/// <param name="length">nr of bytes to read</param>
/// <returns></returns>
public byte[] Read(int length)
{
if (length < 1 || length > maxBufferLength)
{
throw new Exception("Length is out of bounds");
}
byte[] result = new byte[length];
var readOp = LibcWrapper.Read(_deviceHandle, result, length);
if (readOp != length)
{
throw new Exception($"Read error. Returned: {readOp}, expected: {length}");
}
return(result);
}