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79 changes: 79 additions & 0 deletions
79
core/src/main/java/me/retrodaredevil/io/modbus/handling/BaseReadRegisters.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| package me.retrodaredevil.io.modbus.handling; | ||
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| import me.retrodaredevil.io.modbus.ModbusMessage; | ||
| import me.retrodaredevil.io.modbus.ModbusMessages; | ||
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| import java.util.Objects; | ||
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| import static me.retrodaredevil.io.modbus.ModbusMessages.get16BitDataFrom8BitArray; | ||
| import static me.retrodaredevil.io.modbus.ModbusMessages.get8BitDataFrom16BitArray; | ||
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| public class BaseReadRegisters extends BaseStartingDataAddress implements MessageResponseCreator<int[]> { | ||
| private final int functionCode; | ||
| private final int numberOfRegisters; | ||
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| /** | ||
| * @param startingDataAddress The starting register | ||
| * @param functionCode | ||
| * @param numberOfRegisters The number of registers to read. The array returned from {@link #handleResponse(ModbusMessage)} will have a length of this | ||
| */ | ||
| public BaseReadRegisters(int startingDataAddress, int functionCode, int numberOfRegisters) { | ||
| super(startingDataAddress); | ||
| this.functionCode = functionCode; | ||
| this.numberOfRegisters = numberOfRegisters; | ||
| } | ||
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| public int getNumberOfRegisters() { | ||
| return numberOfRegisters; | ||
| } | ||
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| @Override | ||
| public boolean equals(Object o) { | ||
| if (this == o) return true; | ||
| if (o == null || getClass() != o.getClass()) return false; | ||
| BaseReadRegisters that = (BaseReadRegisters) o; | ||
| return getStartingDataAddress() == that.getStartingDataAddress() && | ||
| getNumberOfRegisters() == that.getNumberOfRegisters(); | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| return Objects.hash(getStartingDataAddress(), getNumberOfRegisters()); | ||
| } | ||
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| @Override | ||
| public ModbusMessage createRequest() { | ||
| return ModbusMessages.createMessage(functionCode, get8BitDataFrom16BitArray(getStartingDataAddress(), numberOfRegisters)); | ||
| } | ||
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| @Override | ||
| public int[] handleResponse(ModbusMessage response) { | ||
| int expectedLength = numberOfRegisters * 2 + 1; | ||
| HandleResponseHelper.checkResponse(response, functionCode, expectedLength); | ||
| int[] allData = response.getData(); | ||
| int byteCount = allData[0]; | ||
| if(byteCount != numberOfRegisters * 2){ | ||
| throw new ParsedResponseException(response, "Inconsistent byte count! byteCount=" + byteCount + ". expected=" + (numberOfRegisters * 2)); | ||
| } | ||
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| int[] data = new int[allData.length - 1]; | ||
| System.arraycopy(allData, 1, data, 0, data.length); | ||
| return get16BitDataFrom8BitArray(data); | ||
| } | ||
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| @Override | ||
| public ModbusMessage createResponse(int[] data16Bit) { | ||
| if (data16Bit.length != numberOfRegisters) { | ||
| throw new IllegalArgumentException("The array of 16 bit integers passed was not the correct length! numberOfRegisters=" + numberOfRegisters + ". The passed data should have that length."); | ||
| } | ||
| int[] data = get8BitDataFrom16BitArray(data16Bit); | ||
| int byteCount = numberOfRegisters * 2; | ||
| if (data.length != byteCount) { | ||
| throw new AssertionError("We just checked this. This is a code problem."); | ||
| } | ||
| int[] allData = new int[data.length + 1]; | ||
| allData[0] = byteCount; | ||
| System.arraycopy(data, 0, allData, 1, data.length); | ||
| return ModbusMessages.createMessage(functionCode, allData); | ||
| } | ||
| } |
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21 changes: 21 additions & 0 deletions
21
core/src/main/java/me/retrodaredevil/io/modbus/handling/ReadInputRegisters.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,21 @@ | ||
| package me.retrodaredevil.io.modbus.handling; | ||
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| import me.retrodaredevil.io.modbus.FunctionCode; | ||
| import me.retrodaredevil.io.modbus.parsing.MessageParseException; | ||
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| public class ReadInputRegisters extends BaseReadRegisters { | ||
| public ReadInputRegisters(int startingDataAddress, int numberOfRegisters) { | ||
| super(startingDataAddress, FunctionCode.READ_HOLDING_REGISTERS, numberOfRegisters); | ||
| } | ||
| public static ReadInputRegisters parseFromRequestData(int[] data) throws MessageParseException { | ||
| if (data.length != 4) { | ||
| throw new MessageParseException("data.length != 4! data.length=" + data.length); | ||
| } | ||
| return new ReadInputRegisters( | ||
| data[0] << 8 | data[1], | ||
| data[2] << 8 | data[3] | ||
| ); | ||
| } | ||
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| } | ||
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