57 lines
1.6 KiB
C#
57 lines
1.6 KiB
C#
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using System;
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using System.Device.Gpio;
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using System.Device.I2c;
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namespace Libs_SequentMicrosystems
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{
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public class RTDStackLevelReader
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{
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public readonly byte DEVICE_ADDRESS = 0x40;
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public readonly byte RTD_RESISTANCE_ADD = 59;
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/// <summary>
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/// Read Single Resistance
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/// </summary>
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/// <param name="stack">Level on Stack 0-7</param>
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/// <param name="channel">Chanel on stack layer 1-8</param>
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/// <returns>Resistance of selected element</returns>
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/// <exception cref="ArgumentException"></exception>
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/// <exception cref="IOException"></exception>
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public float Get(byte stack, byte channel)
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{
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if (stack < 0 || stack > 7)
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throw new ArgumentException("Invalid stack level");
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if (channel < 1 || channel > 8)
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throw new ArgumentException("Invalid channel number");
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float val = -273.15f;
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try
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{
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using (I2cDevice i2c = I2cDevice.Create(new I2cConnectionSettings(1, DEVICE_ADDRESS + stack)))
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{
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byte[] buffer = new byte[4];
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i2c.WriteByte((byte)(RTD_RESISTANCE_ADD + (4 * (channel - 1))));
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i2c.Read(buffer);
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val = BitConverter.ToSingle(buffer, 0);
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}
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}
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catch (IOException e)
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{
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throw new IOException($"Fail to communicate with the RTD card with message: \"{e.Message}\"");
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}
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return val;
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}
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//public float[] GetStack(byte stack)
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//{
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//}
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}
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}
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