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/* | ||
* Copyright (c) 2019. Open JumpCO | ||
* | ||
* This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. | ||
* | ||
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. | ||
* You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
*/ | ||
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package io.jumpco.open.kfsm | ||
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import java.io.ByteArrayOutputStream | ||
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class Block { | ||
val byteArrayOutputStream = ByteArrayOutputStream(32) | ||
fun addByte(byte: Int) { | ||
byteArrayOutputStream.write(byte) | ||
} | ||
} | ||
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class Packet { | ||
val fields = mutableListOf<ByteArray>() | ||
var currentField: Block? = null | ||
var checksumValid: Boolean = false | ||
private set | ||
public get | ||
val checkSum = Block() | ||
fun addField() { | ||
currentField = Block() | ||
} | ||
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fun endField() { | ||
val field = currentField | ||
require(field != null) { "expected currentField to have a value" } | ||
fields.add(field.byteArrayOutputStream.toByteArray()) | ||
currentField = null | ||
} | ||
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fun addByte(byte: Int) { | ||
val field = currentField | ||
require(field != null) { "expected currentField to have a value" } | ||
field.addByte(byte) | ||
} | ||
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fun addChecksum(byte: Int) { | ||
checkSum.addByte(byte) | ||
} | ||
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fun checksum() { | ||
require(checkSum.byteArrayOutputStream.size() > 0) | ||
val checksumBytes = checkSum.byteArrayOutputStream.toByteArray() | ||
// TODO calc checksum using all fields and verify with checksumBytes and update checksumValid | ||
} | ||
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fun sendNACK() { | ||
println("NACK") | ||
} | ||
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fun sendACK() { | ||
println("ACK") | ||
} | ||
} | ||
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enum class ReaderEvents(val code: Int) { | ||
BYTE(0x00), | ||
SOH(0x01), | ||
STX(0x02), | ||
ETX(0x03), | ||
EOT(0x04), | ||
ESC(0x1b) | ||
} | ||
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enum class ReaderStates { | ||
START, | ||
RCVPCKT, | ||
RCVDATA, | ||
RCVESC, | ||
RCVCHK, | ||
RCVCHKESC, | ||
CHKSUM, | ||
END | ||
} | ||
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class PacketReaderFSM(private val packet: Packet) { | ||
companion object { | ||
private val definition = stateMachine(ReaderStates.values().toSet(), ReaderEvents::class, Packet::class) { | ||
default { | ||
transition(ReaderEvents.BYTE to ReaderStates.END) { | ||
sendNACK() | ||
} | ||
transition(ReaderEvents.SOH to ReaderStates.END) { | ||
sendNACK() | ||
} | ||
transition(ReaderEvents.STX to ReaderStates.END) { | ||
sendNACK() | ||
} | ||
transition(ReaderEvents.ETX to ReaderStates.END) { | ||
sendNACK() | ||
} | ||
transition(ReaderEvents.EOT to ReaderStates.END) { | ||
sendNACK() | ||
} | ||
transition(ReaderEvents.ESC to ReaderStates.END) { | ||
sendNACK() | ||
} | ||
} | ||
state(ReaderStates.START) { | ||
transition(ReaderEvents.SOH to ReaderStates.RCVPCKT) {} | ||
} | ||
state(ReaderStates.RCVPCKT) { | ||
transition(ReaderEvents.STX to ReaderStates.RCVDATA) { | ||
addField() | ||
} | ||
transition(ReaderEvents.BYTE to ReaderStates.RCVCHK) { args -> | ||
require(args.size == 1) | ||
args as Array<Int> | ||
addChecksum(args[0]) | ||
} | ||
} | ||
state(ReaderStates.RCVDATA) { | ||
transition(ReaderEvents.BYTE) { args -> | ||
require(args.size == 1) | ||
args as Array<Int> | ||
addByte(args[0]) | ||
} | ||
transition(ReaderEvents.ETX to ReaderStates.RCVPCKT) { | ||
endField() | ||
} | ||
transition(ReaderEvents.ESC to ReaderStates.RCVESC) {} | ||
} | ||
state(ReaderStates.RCVESC) { | ||
transition(ReaderEvents.ESC to ReaderStates.RCVDATA) { | ||
addByte(ReaderEvents.ESC.code) | ||
} | ||
transition(ReaderEvents.STX to ReaderStates.RCVDATA) { | ||
addByte(ReaderEvents.STX.code) | ||
} | ||
transition(ReaderEvents.SOH to ReaderStates.RCVDATA) { | ||
addByte(ReaderEvents.SOH.code) | ||
} | ||
transition(ReaderEvents.ETX to ReaderStates.RCVDATA) { | ||
addByte(ReaderEvents.ETX.code) | ||
} | ||
transition(ReaderEvents.EOT to ReaderStates.RCVDATA) { | ||
addByte(ReaderEvents.EOT.code) | ||
} | ||
} | ||
state(ReaderStates.RCVCHK) { | ||
transition(ReaderEvents.BYTE) { args -> | ||
require(args.size == 1) | ||
args as Array<Int> | ||
addChecksum(args[0]) | ||
} | ||
transition(ReaderEvents.ESC to ReaderStates.RCVCHKESC) {} | ||
transition(ReaderEvents.EOT to ReaderStates.CHKSUM) { | ||
checksum() | ||
} | ||
} | ||
state(ReaderStates.CHKSUM) { | ||
automatic(ReaderStates.END, guard = { !checksumValid }) { | ||
sendNACK() | ||
} | ||
automatic(ReaderStates.END, guard = { checksumValid }) { | ||
sendACK() | ||
} | ||
} | ||
state(ReaderStates.RCVCHKESC) { | ||
transition(ReaderEvents.ESC to ReaderStates.RCVCHK) { | ||
addChecksum(ReaderEvents.ESC.code) | ||
} | ||
transition(ReaderEvents.SOH to ReaderStates.RCVCHK) { | ||
addChecksum(ReaderEvents.SOH.code) | ||
} | ||
transition(ReaderEvents.EOT to ReaderStates.RCVCHK) { | ||
addChecksum(ReaderEvents.EOT.code) | ||
} | ||
transition(ReaderEvents.STX to ReaderStates.RCVCHK) { | ||
addChecksum(ReaderEvents.STX.code) | ||
} | ||
transition(ReaderEvents.ETX to ReaderStates.RCVCHK) { | ||
addChecksum(ReaderEvents.ETX.code) | ||
} | ||
} | ||
}.build() | ||
} | ||
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private val fsm = definition.create(packet) | ||
fun receiveByte(byte: Int) { | ||
when (byte) { | ||
ReaderEvents.SOH.code -> fsm.sendEvent(ReaderEvents.SOH) | ||
ReaderEvents.STX.code -> fsm.sendEvent(ReaderEvents.STX) | ||
ReaderEvents.ETX.code -> fsm.sendEvent(ReaderEvents.ETX) | ||
ReaderEvents.EOT.code -> fsm.sendEvent(ReaderEvents.EOT) | ||
ReaderEvents.ESC.code -> fsm.sendEvent(ReaderEvents.ESC) | ||
ReaderEvents.BYTE.code -> fsm.sendEvent(ReaderEvents.BYTE, byte) | ||
else -> fsm.sendEvent(ReaderEvents.BYTE, byte) | ||
} | ||
} | ||
} |