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82 lines
2.0 KiB
C++
82 lines
2.0 KiB
C++
/*
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Copyright (c) 2016-2020 Peter Antypas
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This file is part of the MAIANA™ transponder firmware.
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The firmware is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>
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*/
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#ifndef RECEIVER_HPP_
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#define RECEIVER_HPP_
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#include "RXPacket.hpp"
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#include "RadioState.hpp"
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#include "RFIC.hpp"
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#include "AISChannels.h"
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class Receiver : public RFIC
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{
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public:
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Receiver(GPIO_TypeDef *sdnPort,
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uint32_t sdnPin,
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GPIO_TypeDef *csPort,
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uint32_t csPin,
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GPIO_TypeDef *dataPort,
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uint32_t dataPin,
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GPIO_TypeDef *clockPort,
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uint32_t clockPin,
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int chipId);
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virtual ~Receiver();
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bool init();
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VHFChannel channel();
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virtual void startReceiving(VHFChannel channel, bool reconfigGPIOs);
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virtual void onBitClock();
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virtual void timeSlotStarted(uint32_t slot);
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void switchToChannel(VHFChannel channel);
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protected:
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typedef enum
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{
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NO_ACTION,
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RESTART_RX,
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RETRIEVE_RSSI
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} Action;
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void startListening(VHFChannel channel, bool reconfigGPIOs);
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bool addBit(uint8_t bit);
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void resetBitScanner();
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uint8_t reportRSSI();
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void pushPacket();
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Action processNRZIBit(uint8_t level);
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virtual void configureGPIOsForRX();
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protected:
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RXPacket *mRXPacket = nullptr;
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uint16_t mBitWindow;
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uint8_t mLastNRZIBit;
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uint32_t mBitCount;
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uint32_t mOneBitCount;
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BitState mBitState;
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uint8_t mRXByte;
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VHFChannel mChannel;
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int mSlotBitNumber;
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VHFChannel mNextChannel;
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uint32_t mTimeSlot = 0xffffffff;
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};
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#endif /* RECEIVER_HPP_ */
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