Innovenergy_trunk/csharp/Lib/Protocols/Modbus/Clients/ModbusRtuClient.cs

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2023-02-16 12:57:06 +00:00
using System.Diagnostics;
using System.Runtime.CompilerServices;
using InnovEnergy.Lib.Protocols.Modbus.Connections;
using InnovEnergy.Lib.Protocols.Modbus.Conversions;
using InnovEnergy.Lib.Protocols.Modbus.Protocol;
using InnovEnergy.Lib.Protocols.Modbus.Protocol.Frames;
using InnovEnergy.Lib.Protocols.Modbus.Protocol.Frames.Commands;
using InnovEnergy.Lib.Protocols.Modbus.Protocol.Frames.Replies;
using InnovEnergy.Lib.Protocols.Modbus.Util;
using InnovEnergy.Lib.Utils;
using Bytes = System.Collections.Generic.IReadOnlyList<System.Byte>;
using static System.Runtime.CompilerServices.MethodImplOptions;
namespace InnovEnergy.Lib.Protocols.Modbus.Clients;
using UInt16s = IReadOnlyList<UInt16>;
public class ModbusRtuClient : ModbusClient
{
private const Int32 CrcSize = 2;
public ModbusRtuClient(ModbusConnection connection, Byte slaveId) : base(connection, slaveId)
{
}
public override IReadOnlyList<Boolean> ReadDiscreteInputs(UInt16 readAddress, UInt16 nValues)
{
throw new NotImplementedException();
}
public override ModbusRegisters ReadInputRegisters(UInt16 readAddress, UInt16 nValues)
{
var wireReadAddress = LogicToWire(readAddress);
var cmd = new ReadInputRegistersCommandFrame(SlaveId, wireReadAddress, nValues);
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var crc = CalcCrc(cmd);
// TX
cmd.Data.Concat(crc).Apply(Connection.Transmit);
var nToRead = cmd.ExpectedResponseSize + CrcSize;
// RX
var response = nToRead
.ConvertTo<UInt16>()
.Apply(Connection.Receive)
.ToArraySegment()
.Apply(AssertCrc)
.SkipLast(CrcSize)
.Apply(ReadInputRegistersResponseFrame.Parse)
.Apply(cmd.VerifyResponse);
return new ModbusRegisters(readAddress, response.RegistersRead.ToArray());
}
public override ModbusRegisters ReadHoldingRegisters(UInt16 readAddress, UInt16 nValues)
{
var wireReadAddress = LogicToWire(readAddress);
var cmd = new ReadHoldingRegistersCommandFrame(SlaveId, wireReadAddress, nValues);
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var crc = CalcCrc(cmd.Data);
// TX
cmd.Data.Concat(crc).Apply(Connection.Transmit);
// RX
var nToRead = cmd.ExpectedResponseSize + CrcSize;
var response = nToRead
.ConvertTo<UInt16>()
.Apply(Connection.Receive)
.ToArraySegment()
.Apply(AssertCrc)
.SkipLast(CrcSize)
.Apply(ReadHoldingRegistersResponseFrame.Parse)
.Apply(cmd.VerifyResponse);
return new ModbusRegisters(readAddress, response.RegistersRead.ToArray());
}
public override UInt16 WriteMultipleCoils(UInt16 writeAddress, IReadOnlyList<Boolean> coils)
{
throw new NotImplementedException();
}
public override UInt16 WriteRegisters(UInt16 writeAddress, UInt16s values)
{
var wireWriteAddress = LogicToWire(writeAddress);
var cmd = new WriteRegistersCommandFrame(SlaveId, wireWriteAddress, values);
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var crc = CalcCrc(cmd);
var nToRead = cmd.ExpectedResponseSize + CrcSize;
// TX
cmd.Data.Concat(crc).Apply(Connection.Transmit);
// RX
var response = nToRead
.ConvertTo<UInt16>()
.Apply(Connection.Receive)
.ToArraySegment()
.Apply(AssertCrc)
.SkipLast(CrcSize)
.Apply(WriteRegistersResponseFrame.Parse)
.Apply(cmd.VerifyResponse);
return response.NbWritten;
}
public override ModbusRegisters ReadWriteRegisters(UInt16 readAddress, UInt16 nbToRead, UInt16 writeAddress, UInt16s registersToWrite)
{
var wireReadAddress = LogicToWire(readAddress);
var wireWriteAddress = LogicToWire(writeAddress);
var cmd = new ReadWriteRegistersCommandFrame(SlaveId,
wireReadAddress,
nbToRead,
wireWriteAddress,
registersToWrite);
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var crc = CalcCrc(cmd);
// TX
cmd.Data.Concat(crc).Apply(Connection.Transmit);
// RX
var nToRead = cmd.ExpectedResponseSize + CrcSize;
var response = nToRead
.ConvertTo<UInt16>()
.Apply(Connection.Receive)
.ToArraySegment()
.SkipLast(CrcSize)
.Apply(ReadWriteRegistersResponseFrame.Parse)
.Apply(cmd.VerifyResponse);
return new ModbusRegisters(readAddress, response.RegistersRead.ToArray());
}
public static ArraySegment<Byte> AssertCrc(ArraySegment<Byte> data)
{
var expectedCrc = data.SkipLast(CrcSize).Apply(CalcCrc);
var actualCrc = data.TakeLast(CrcSize);
if (!actualCrc.SequenceEqual(expectedCrc))
throw new CrcException(expectedCrc, actualCrc);
return data;
}
// not used ATM, see AssertCrc
public static Boolean CheckCrc(Bytes data)
{
var expectedCrc = data.SkipLast(CrcSize).Apply(CalcCrc);
var actualCrc = data.TakeLast(CrcSize);
return actualCrc.SequenceEqual(expectedCrc);
}
[DebuggerStepThrough][MethodImpl(AggressiveInlining)]
private static Bytes CalcCrc(ModbusFrame frame) => CalcCrc(frame.Data);
[DebuggerStepThrough][MethodImpl(AggressiveInlining)]
private static Bytes CalcCrc(ArraySegment<Byte> data) => CalcCrc((IEnumerable<Byte>)data);
private static Bytes CalcCrc(IEnumerable<Byte> data)
{
UInt16 crc = 0xFFFF;
foreach (var b in data)
{
crc ^= b;
for (var bit = 0; bit < 8; bit++)
{
var bit0 = (crc & 0x0001) != 0;
crc >>= 1;
if (bit0) crc ^= 0xA001;
}
}
var hi = 0xFF & crc;
var lo = (crc >> 8) & 0xFF;
return new[] { (Byte)hi, (Byte)lo }; // big endian
}
}