mirror of
https://github.com/DCC-EX/CommandStation-EX.git
synced 2024-11-22 23:56:13 +01:00
77 lines
2.5 KiB
C++
77 lines
2.5 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.
|
|
|
|
class DCCWaveform {
|
|
public:
|
|
DCCWaveform( byte preambleBits, bool isMain);
|
|
static void begin();
|
|
static void loop();
|
|
static DCCWaveform mainTrack;
|
|
static DCCWaveform progTrack;
|
|
inline void clearRepeats() { transmitRepeats=0; }
|
|
void schedulePacket(const byte buffer[], byte byteCount, byte repeats);
|
|
volatile bool packetPending;
|
|
volatile byte sentResetsSincePacket;
|
|
|
|
private:
|
|
|
|
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
|