mirror of
https://github.com/DCC-EX/CommandStation-EX.git
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116 lines
3.6 KiB
C++
116 lines
3.6 KiB
C++
/*
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* © 2020, Chris Harlow. All rights reserved.
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*
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* This file is part of Asbelos DCC API
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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 "Config.h"
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const int POWER_SAMPLE_ON_WAIT = 100;
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const int POWER_SAMPLE_OFF_WAIT = 1000;
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const int POWER_SAMPLE_OVERLOAD_WAIT = 20;
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const int MIN_ACK_PULSE_DURATION = 3000;
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const int MAX_ACK_PULSE_DURATION = 8500;
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const int PREAMBLE_BITS_MAIN = 20;
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const int PREAMBLE_BITS_PROG = 22;
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const byte MAX_PACKET_SIZE = 12;
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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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enum class POWERMODE { OFF, ON, OVERLOAD };
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const byte idlePacket[] = {0xFF, 0x00, 0xFF};
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const byte resetPacket[] = {0x00, 0x00, 0x00};
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class DCCWaveform {
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public:
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DCCWaveform( byte preambleBits, bool isMain, int maxRawCurrent);
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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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void beginTrack();
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void setPowerMode(POWERMODE);
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POWERMODE getPowerMode();
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void checkPowerOverload();
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int getLastCurrent();
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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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void setAckBaseline(bool debug); //prog track only
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void setAckPending(bool debug); //prog track only
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byte getAck(bool debug); //prog track only 0=NACK, 1=ACK 2=keep waiting
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static bool progTrackSyncMain; // true when prog track is a siding switched to main
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private:
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static void interruptHandler();
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bool interrupt1();
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void interrupt2();
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void checkAck();
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void setSignal(bool high);
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bool isMainTrack;
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// Transmission controller
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byte transmitPacket[MAX_PACKET_SIZE]; // packet being transmitted
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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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bool currentBit; // bit to be transmitted
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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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byte state; // wave generator state machine
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byte pendingPacket[MAX_PACKET_SIZE];
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byte pendingLength;
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byte pendingRepeats;
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int lastCurrent;
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// current sampling
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POWERMODE powerMode;
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unsigned long lastSampleTaken;
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unsigned int sampleDelay;
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int rawCurrentTripValue;
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static const int ACK_CURRENT_TRIP=1000; // During ACK processing limit can be higher
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unsigned long power_sample_overload_wait = POWER_SAMPLE_OVERLOAD_WAIT;
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unsigned int power_good_counter = 0;
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// ACK management (Prog track only)
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bool ackPending;
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bool ackDetected;
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int ackThreshold;
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int ackMaxCurrent;
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unsigned long ackCheckStart; // millis
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unsigned int ackCheckDuration; // millis
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unsigned int ackPulseDuration; // micros
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unsigned long ackPulseStart; // micros
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};
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#endif
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