ushort GetCommandRegister()
{
try
{
byte[] receiveBuffer = new byte[2];
m_i2c.Write(m_slaveAddress, AD7291_REG_COMMAND);
receiveBuffer[0] = m_i2c.Read(m_slaveAddress);
receiveBuffer[1] = m_i2c.Read(m_slaveAddress);
ushort registerValue = (ushort)((receiveBuffer[0] << 8) + receiveBuffer[1]);
return(registerValue);
}
catch (Exception err)
{
throw (new SystemException(err.Message));
}
}
byte retrievePortData(byte reg, byte port)
{
try
{
if (port > 5)
{
throw (new SystemException("Invalid port number for PCA9505"));
}
byte data = (byte)((reg + port) | PCA9505_AI_OFF);
m_i2c.Write(m_slaveAddress, data);
data = m_i2c.Read(m_slaveAddress);
return(data);
}
catch (Exception err)
{
throw (new SystemException(err.Message));
}
}
public void SelectDiffrentialChannelPlusMinus(CHANNEL ChannelInPlus, CHANNEL ChannelInMinus, bool Enable)
{
byte Prehumble = 0x80;
byte SG = 0;
byte ODD_SIGN = 0;
byte A2, A1, A0;
byte dataToWrite = 0;
byte enable = (byte)(Enable == true ? 0x20 : 0);
Tuple <CHANNEL, CHANNEL> t = new Tuple <CHANNEL, CHANNEL>(ChannelInPlus, ChannelInMinus);
SG = m_diffMuxPlusMinus[t].Item1;
ODD_SIGN = m_diffMuxPlusMinus[t].Item2;
A2 = m_diffMuxPlusMinus[t].Item3;
A1 = m_diffMuxPlusMinus[t].Item4;
A0 = m_diffMuxPlusMinus[t].Item5;
dataToWrite = (byte)(Prehumble | enable | SG << 4 | ODD_SIGN << 3 | A2 << 2 | A1 << 1 | A0);
//see table here: http://www.analog.com/media/en/technical-documentation/data-sheets/2497fb.pdf
m_i2c.Write(m_slaveAddress, dataToWrite);
}