using System.Device.I2c;
namespace Libs_SequentMicrosystems
{
public class RTDStackLevelReader
{
public readonly byte DEVICE_ADDRESS = 0x40;
public readonly byte RTD_RESISTANCE_ADD = 59;
///
/// Read Single Resistance
///
/// Level on Stack 0-7
/// Chanel on stack layer 1-8
/// Resistance of selected element
///
///
public float Get(byte stack, byte channel)
{
if (stack < 0 || stack > 7)
throw new ArgumentException("Invalid stack level");
if (channel < 1 || channel > 8)
throw new ArgumentException("Invalid channel number");
float val = -273.15f;
try
{
using (I2cDevice i2c = I2cDevice.Create(new I2cConnectionSettings(1, DEVICE_ADDRESS + stack)))
{
byte[] buffer = new byte[4];
i2c.WriteByte((byte)(RTD_RESISTANCE_ADD + (4 * (channel - 1))));
i2c.Read(buffer);
val = BitConverter.ToSingle(buffer, 0);
}
}
catch (IOException e)
{
throw new IOException($"Fail to communicate with the RTD card with message: \"{e.Message}\"");
}
return val;
}
///
/// Get data from all inputs on stack level
///
/// Number of level in stack
/// Number of decimals numbers of measured resistance
/// Measured resistances of all inputs
public float[] GetStack(byte stack, byte precision = 2)
{
float[] chanels = new float[8]; //initialize float array
chanels[0] = (float)Math.Round(Get(stack, 1), precision); //write readed value from input to array
chanels[1] = (float)Math.Round(Get(stack, 2), precision);
chanels[2] = (float)Math.Round(Get(stack, 3), precision);
chanels[3] = (float)Math.Round(Get(stack, 4), precision);
chanels[4] = (float)Math.Round(Get(stack, 5), precision);
chanels[5] = (float)Math.Round(Get(stack, 6), precision);
chanels[6] = (float)Math.Round(Get(stack, 7), precision);
chanels[7] = (float)Math.Round(Get(stack, 8), precision);
return chanels; //return array
}
}
}