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https://github.com/ckaczor/OneWireAPI.git
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File and class renaming
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242
DeviceFamily20.cs
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242
DeviceFamily20.cs
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namespace OneWireAPI
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{
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public class DeviceFamily20 : Device
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{
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private readonly byte[] _control = new byte[16];
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public enum Range : byte
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{
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Range512 = 0x01,
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Range256 = 0x00
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}
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public enum Resolution : byte
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{
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EightBits = 0x08,
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SixteenBits = 0x00
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}
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public DeviceFamily20(Session session, short[] id)
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: base(session, id)
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{
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}
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public void Initialize()
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{
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const int startAddress = 0x8; // Starting data page address
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const int endAddress = 0x11; // Ending data page address
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// Setup the control page
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for (var index = 0; index < 8; index += 2)
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{
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_control[index] = (byte) Resolution.EightBits;
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_control[index + 1] = (byte) Range.Range512;
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}
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// Clear the alarm page
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for (var index = 8; index < 16; index++)
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{
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_control[index] = 0;
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}
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// Data buffer to send over the network
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var data = new byte[30];
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// How many bytes of data to send
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short dataCount = 0;
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// Set the command into the data array
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data[dataCount++] = 0x55;
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// Set the starting address of the data to write
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data[dataCount++] = startAddress & 0xFF;
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data[dataCount++] = (startAddress >> 8) & 0xFF;
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// Select and access the ID of the device we want to talk to
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Adapter.Select(DeviceId);
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// Write to the data pages specified
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for (var index = startAddress; index <= endAddress; index++)
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{
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// Copy the control data into our output buffer
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data[dataCount++] = _control[index - startAddress];
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// Add two bytes for the CRC results
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data[dataCount++] = 0xFF;
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data[dataCount++] = 0xFF;
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// Add a byte for the control byte echo
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data[dataCount++] = 0xFF;
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// Send the block
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Adapter.SendBlock(data, dataCount);
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// If the check byte doesn't match then throw an exception
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if (data[dataCount - 1] != _control[index - startAddress])
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{
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// Throw an exception
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throw new OneWireException(OneWireException.ExceptionFunction.SendBlock, DeviceId);
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}
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int calculatedCrc; // CRC we calculated from sent data
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int sentCrc; // CRC retrieved from the device
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// Calculate the CRC values
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if (index == startAddress)
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{
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// Calculate the CRC16 of the data sent
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calculatedCrc = Crc16.Calculate(data, 0, 3);
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// Reconstruct the CRC sent by the device
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sentCrc = data[dataCount - 2] << 8;
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sentCrc |= data[dataCount - 3];
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sentCrc ^= 0xFFFF;
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}
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else
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{
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// Calculate the CRC16 of the data sent
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calculatedCrc = Crc16.Calculate(_control[index - startAddress], index);
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// Reconstruct the CRC sent by the device
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sentCrc = data[dataCount - 2] << 8;
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sentCrc |= data[dataCount - 3];
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sentCrc ^= 0xFFFF;
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}
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// If the CRC doesn't match then throw an exception
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if (calculatedCrc != sentCrc)
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{
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// Throw a CRC exception
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throw new OneWireException(OneWireException.ExceptionFunction.Crc, DeviceId);
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}
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// Reset the byte count
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dataCount = 0;
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}
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}
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public double[] GetVoltages()
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{
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// Select and access the ID of the device we want to talk to
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Adapter.Select(DeviceId);
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// Data buffer to send over the network
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var data = new byte[30];
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// How many bytes of data to send
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short dataCount = 0;
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// Set the convert command into the transmit buffer
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data[dataCount++] = 0x3C;
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// Set the input mask to get all channels
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data[dataCount++] = 0x0F;
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// Set the read-out control to leave things as they are
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data[dataCount++] = 0x00;
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// Add two bytes for the CRC results
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data[dataCount++] = 0xFF;
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data[dataCount++] = 0xFF;
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// Send the data block
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Adapter.SendBlock(data, dataCount);
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// Calculate the CRC based on the transmit buffer
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var calculatedCrc = Crc16.Calculate(data, 0, 2);
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// Reconstruct the CRC sent by the device
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var sentCrc = data[4] << 8;
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sentCrc |= data[3];
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sentCrc ^= 0xFFFF;
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// If the CRC doesn't match then throw an exception
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if (calculatedCrc != sentCrc)
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{
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// Throw a CRC exception
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throw new OneWireException(OneWireException.ExceptionFunction.Crc, DeviceId);
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}
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// Setup for for power delivery after the next byte
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Adapter.SetLevel(TMEX.LevelOperation.Write, TMEX.LevelMode.StrongPullup, TMEX.LevelPrime.AfterNextByte);
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var nTransmitByte = (short) ((dataCount - 1) & 0x1F);
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try
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{
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// Send the byte and start strong pullup
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Adapter.SendByte(nTransmitByte);
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}
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catch
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{
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// Stop the strong pullup
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Adapter.SetLevel(TMEX.LevelOperation.Write, TMEX.LevelMode.Normal, TMEX.LevelPrime.Immediate);
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// Re-throw the exception
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throw;
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}
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// Sleep while the data is transfered
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System.Threading.Thread.Sleep(6);
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// Stop the strong pullup
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Adapter.SetLevel(TMEX.LevelOperation.Write, TMEX.LevelMode.Normal, TMEX.LevelPrime.Immediate);
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// Read data to see if the conversion is over
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Adapter.ReadByte();
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// Select and access the ID of the device we want to talk to
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Adapter.Select(DeviceId);
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// Reinitialize the data count
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dataCount = 0;
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// Set the read command into the transmit buffer
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data[dataCount++] = 0xAA;
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// Set the address to get the conversion results
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data[dataCount++] = 0x00;
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data[dataCount++] = 0x00;
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// Add 10 bytes to be read - 8 for the data and 2 for the CRC
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for (var index = 0; index < 10; index++)
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data[dataCount++] = 0xFF;
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// Send the block to the device
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Adapter.SendBlock(data, dataCount);
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// Calculate the CRC of the transmitted data
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calculatedCrc = Crc16.Calculate(data, 0, 10);
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// Reconstruct the CRC sent by the device
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sentCrc = data[dataCount - 1] << 8;
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sentCrc |= data[dataCount - 2];
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sentCrc ^= 0xFFFF;
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// If the CRC doesn't match then throw an exception
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if (calculatedCrc != sentCrc)
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{
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// Throw a CRC exception
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throw new OneWireException(OneWireException.ExceptionFunction.Crc, DeviceId);
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}
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// Voltage values to return
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var voltages = new double[4];
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// Convert the data into a double
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for (var index = 3; index < 11; index += 2)
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{
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// Reconstruct the two bytes into the 16-bit values
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var iVoltageReadout = ((data[index + 1] << 8) | data[index]) & 0x0000FFFF;
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// Figure out the percentage of the top voltage is present
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voltages[(index - 3) / 2] = iVoltageReadout / 65535.0;
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// Apply the percentage to the maximum voltage range
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voltages[(index - 3) / 2] *= ((_control[(index - 3) + 1] & 0x01) == 0x01 ? 5.12 : 2.56);
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}
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return voltages;
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}
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}
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}
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