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CommandStation-EX/DCCWaveform.h
Asbelos a7740d652d It builds....
massive track reorganization
2022-02-23 15:44:34 +00:00

96 lines
3.2 KiB
C++

/*
* © 2021 M Steve Todd
* © 2021 Mike S
* © 2021 Fred Decker
* © 2020-2021 Harald Barth
* © 2020-2021 Chris Harlow
* All rights reserved.
*
* This file is part of CommandStation-EX
*
* This 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.
*
* It 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 CommandStation. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef DCCWaveform_h
#define DCCWaveform_h
#include "MotorDriver.h"
// Number of preamble bits.
const int PREAMBLE_BITS_MAIN = 16;
const int PREAMBLE_BITS_PROG = 22;
const byte MAX_PACKET_SIZE = 5; // NMRA standard extended packets, payload size WITHOUT checksum.
// The WAVE_STATE enum is deliberately numbered because a change of order would be catastrophic
// to the transform array.
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};
// NOTE: static functions are used for the overall controller, then
// one instance is created for each track.
const byte idlePacket[] = {0xFF, 0x00, 0xFF};
const byte resetPacket[] = {0x00, 0x00, 0x00};
class DCCWaveform {
public:
DCCWaveform( byte preambleBits, bool isMain);
static void begin();
static void loop();
static DCCWaveform mainTrack;
static DCCWaveform progTrack;
void beginTrack();
static void setJoin(bool join);
static bool isJoined() { return progTrackSyncMain;}
void clearRepeats() {pendingRepeats=0;}
void schedulePacket(const byte buffer[], byte byteCount, byte repeats);
volatile bool packetPending;
static bool progTrackBoosted; // true when prog track is not current limited
volatile byte sentResetsSincePacket;
static void setJoinRelayPin(byte joinRelayPin);
static int16_t joinRelay;
private:
static bool progTrackSyncMain; // true when prog track is a siding switched to main
// For each state of the wave nextState=stateTransform[currentState]
static const WAVE_STATE stateTransform[6];
// For each state of the wave, signal pin is HIGH or LOW
static const bool signalTransform[6];
static void interruptHandler();
void interrupt2();
bool isMainTrack;
// Transmission controller
byte transmitPacket[MAX_PACKET_SIZE+1]; // +1 for checksum
byte transmitLength;
byte transmitRepeats; // remaining repeats of transmission
byte remainingPreambles;
byte requiredPreambles;
byte bits_sent; // 0-8 (yes 9 bits) sent for current byte
byte bytes_sent; // number of bytes sent from transmitPacket
WAVE_STATE state; // wave generator state machine
byte pendingPacket[MAX_PACKET_SIZE+1]; // +1 for checksum
byte pendingLength;
byte pendingRepeats;
};
#endif