mirror of
https://github.com/DCC-EX/CommandStation-EX.git
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77 lines
2.5 KiB
C++
77 lines
2.5 KiB
C++
/*
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* © 2021 M Steve Todd
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* © 2021 Mike S
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* © 2021 Fred Decker
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* © 2020-2021 Harald Barth
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* © 2020-2021 Chris Harlow
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* All rights reserved.
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*
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* This file is part of CommandStation-EX
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*
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* This 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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*
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* It 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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*
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* You should have received a copy of the GNU General Public License
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* along with CommandStation. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef DCCWaveform_h
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#define DCCWaveform_h
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#include "MotorDriver.h"
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// Number of preamble bits.
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const int PREAMBLE_BITS_MAIN = 16;
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const int PREAMBLE_BITS_PROG = 22;
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const byte MAX_PACKET_SIZE = 5; // NMRA standard extended packets, payload size WITHOUT checksum.
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// The WAVE_STATE enum is deliberately numbered because a change of order would be catastrophic
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// to the transform array.
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enum WAVE_STATE : byte {WAVE_START=0,WAVE_MID_1=1,WAVE_HIGH_0=2,WAVE_MID_0=3,WAVE_LOW_0=4,WAVE_PENDING=5};
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// NOTE: static functions are used for the overall controller, then
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// one instance is created for each track.
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class DCCWaveform {
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public:
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DCCWaveform( byte preambleBits, bool isMain);
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static void begin();
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static void loop();
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static DCCWaveform mainTrack;
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static DCCWaveform progTrack;
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inline void clearRepeats() { transmitRepeats=0; }
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void schedulePacket(const byte buffer[], byte byteCount, byte repeats);
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volatile bool packetPending;
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volatile byte sentResetsSincePacket;
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private:
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static void interruptHandler();
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void interrupt2();
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bool isMainTrack;
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// Transmission controller
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byte transmitPacket[MAX_PACKET_SIZE+1]; // +1 for checksum
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byte transmitLength;
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byte transmitRepeats; // remaining repeats of transmission
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byte remainingPreambles;
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byte requiredPreambles;
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byte bits_sent; // 0-8 (yes 9 bits) sent for current byte
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byte bytes_sent; // number of bytes sent from transmitPacket
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WAVE_STATE state; // wave generator state machine
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byte pendingPacket[MAX_PACKET_SIZE+1]; // +1 for checksum
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byte pendingLength;
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byte pendingRepeats;
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};
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#endif
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