esp32_loraprs/kiss_processor.cpp

#include "kiss_processor.h"

namespace Kiss {

CircularBuffer<uint8_t, Processor::CfgSerialToRigQueueSize> Processor::serialToRigQueue_;
CircularBuffer<uint8_t, Processor::CfgRigToSerialQueueSize> Processor::rigToSerialQueue_;
CircularBuffer<uint8_t, Processor::CfgRigToSerialQueueSize> Processor::rigToSerialQueueIndex_;

Processor::Processor()
  : state_(State::GetStart)
{
}

void Processor::serialSend(Cmd cmd, const byte *packet, int packetLength) {
  onSerialTx((byte)Marker::Fend);
  onSerialTx((byte)cmd);

  for (int i = 0; i < packetLength; i++) {
    byte rxByte = packet[i];

    if (rxByte == Marker::Fend) {
      onSerialTx((byte)Marker::Fesc);
      onSerialTx((byte)Marker::Tfend);
    }
    else if (rxByte == Marker::Fesc) {
      onSerialTx((byte)Marker::Fesc);
      onSerialTx((byte)Marker::Tfesc);
    }
    else {
      onSerialTx(rxByte);
    }
  }

  onSerialTx((byte)Marker::Fend);
}

void ICACHE_RAM_ATTR Processor::serialQueueIsr(Cmd cmd, const byte *packet, int packetLength) {
  if (!rigToSerialQueueIndex_.unshift(packetLength)) {
    Serial.println("Rig to serial queue is full!");
    return;
  }
  for (int i = 0; i < packetLength; i++) {
    if (!rigToSerialQueue_.unshift(packet[i])) {
      Serial.println("Rig to serial queue is full!");
      return;
    }
  }
}

void Processor::rigQueue(Cmd cmd, const byte *packet, int packetLength) {
  bool result = 1;
  result &= serialToRigQueue_.unshift(Marker::Fend);
  result &= serialToRigQueue_.unshift(cmd);

  for (int i = 0; i < packetLength; i++) {
    byte rxByte = packet[i];

    if (rxByte == Marker::Fend) {
      result &= serialToRigQueue_.unshift(Marker::Fesc);
      result &= serialToRigQueue_.unshift(Marker::Tfend);
    }
    else if (rxByte == Marker::Fesc) {
      result &= serialToRigQueue_.unshift(Marker::Fesc);
      result &= serialToRigQueue_.unshift(Marker::Tfesc);
    }
    else {
      result &= serialToRigQueue_.unshift(rxByte);
    }
  }

  result &= serialToRigQueue_.unshift(Marker::Fend);

  if (!result) {
    Serial.println("Serial to rig queue overflow!");
  }
}

bool Processor::processRigToSerial() 
{  
  bool isProcessed = false;

  if (rigToSerialQueueIndex_.isEmpty()) {
    return isProcessed;
  }

  while (!rigToSerialQueueIndex_.isEmpty()) {
    
    int rxPacketSize = rigToSerialQueueIndex_.pop();
    byte buf[rxPacketSize];

    for (int i = 0; i < rxPacketSize; i++) {
      buf[i] = rigToSerialQueue_.pop();
    }
    serialSend(Cmd::Data, buf, rxPacketSize);
    onRigPacket(&buf, rxPacketSize);

    isProcessed = true;
    yield();
  }
  return isProcessed;
}

bool Processor::processSerialToRig()
{
  bool isProcessed = false;

  while (onSerialRxHasData() || !serialToRigQueue_.isEmpty()) {
    byte rxByte;
    if (onSerialRxHasData()) {
      if (onSerialRx(&rxByte)) {
          if (!serialToRigQueue_.unshift(rxByte)) {
            Serial.println("Serial to rig buffer is full!");
          }
      }
    }
    if (!serialToRigQueue_.isEmpty()) {
      rxByte = serialToRigQueue_.pop();
      if (receiveByte(rxByte)) {
        isProcessed = true;
      } else {
        serialToRigQueue_.push(rxByte);
      }
    }
    yield();
  }
  return isProcessed;
}

bool Processor::processCommand(byte rxByte) {

  switch (rxByte) {
    case Cmd::Data:
      if (!onRigTxBegin()) {
        return false;
      }
      state_ = State::GetData;
      dataType_ = DataType::Raw;
      break;
    case Cmd::SetHardware:
      state_ = State::GetData;
      dataType_ = DataType::Control;
      cmdBuffer_.clear();
      break;
    case Cmd::P:
      state_ = State::GetP;
      break;
    case Cmd::SlotTime:
      state_ = State::GetSlotTime;
      break;
    case Marker::Fend:
      break;
    default:
      // unknown command
      state_ = State::GetEnd;
      return true;
  }
  return true;
}

void Processor::processData(byte rxByte) {
  switch (rxByte) {
    case Marker::Fesc:
      state_ = State::Escape;
      break;
    case Marker::Fend:
      if (dataType_ == DataType::Raw) {
        onRigTxEnd();
      } else if (dataType_ == DataType::Control) {
        onRadioControlCommand(cmdBuffer_);
      }
      state_ = State::GetStart;
      break;
    default:
      if (dataType_ == DataType::Raw) {
        onRigTx(rxByte);
      } else if (dataType_ == DataType::Control) {
        cmdBuffer_.push_back(rxByte);
      }
      break;
  }
}

bool Processor::receiveByte(byte rxByte) {

  switch (state_) {
    case State::GetStart:
      if (rxByte == Marker::Fend) {
        state_ = State::GetCmd;
      }
      break;
    case State::GetEnd:
      if (rxByte == Marker::Fend) {
        state_ = State::GetStart;
      }
      break;
    case State::GetCmd:
      if (!processCommand(rxByte)) {
        return false;
      }
      break;
    case State::GetP:
      onControlCommand(Cmd::P, rxByte);
      state_ = State::GetEnd;
      break;
    case State::GetSlotTime:
      onControlCommand(Cmd::SlotTime, rxByte);
      state_ = State::GetEnd;
      break;
    case State::GetData:
      processData(rxByte);
      break;
    case State::Escape:
      if (rxByte == Marker::Tfend) {
        onRigTx((byte)Marker::Fend);
        state_ = State::GetData;
      }
      else if (rxByte == Marker::Tfesc) {
        onRigTx((byte)Marker::Fesc);
        state_ = State::GetData;
      }
      else if (rxByte != Marker::Fend) {
        state_ = State::GetEnd;
      }
      break;
    default:
      // unknown state
      state_ = State::GetStart;
      break;
  }
  return true;
}

} // kiss