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CommandStation-EX/DCCWaveform.h
2020-07-02 17:54:09 +01:00

91 lines
2.5 KiB
C++

#ifndef DCCWaveform_h
#define DCCWaveform_h
#include "Config.h"
const int POWER_SAMPLE_ON_WAIT = 100;
const int POWER_SAMPLE_OFF_WAIT = 1000;
const int POWER_SAMPLE_OVERLOAD_WAIT = 4000;
const int PREAMBLE_BITS_MAIN = 20;
const int PREAMBLE_BITS_PROG = 22;
const byte MAX_PACKET_SIZE = 12;
// NOTE: static functions are used for the overall controller, then
// one instance is created for each track.
enum class POWERMODE { OFF, ON, OVERLOAD };
const byte idlePacket[] = {0xFF, 0x00, 0xFF};
const byte resetPacket[] = {0x00, 0x00, 0x00};
class DCCWaveform {
public:
DCCWaveform( byte preambleBits, bool isMain, int maxRawCurrent);
static void begin();
static void loop();
static DCCWaveform mainTrack;
static DCCWaveform progTrack;
void beginTrack();
void setPowerMode(POWERMODE);
POWERMODE getPowerMode();
void checkPowerOverload();
int getLastCurrent();
void schedulePacket(const byte buffer[], byte byteCount, byte repeats);
volatile bool packetPending;
volatile byte sentResetsSincePacket;
void setAckBaseline(bool debug); //prog track only
void setAckPending(bool debug); //prog track only
byte getAck(bool debug); //prog track only 0=NACK, 1=ACK 2=keep waiting
private:
static void interruptHandler();
bool interrupt1();
void interrupt2();
void checkAck();
bool isMainTrack;
// Transmission controller
byte transmitPacket[MAX_PACKET_SIZE]; // packet being transmitted
byte transmitLength;
byte transmitRepeats; // remaining repeats of transmission
byte remainingPreambles;
byte requiredPreambles;
bool currentBit; // bit to be transmitted
byte bits_sent; // 0-8 (yes 9 bits) sent for current byte
byte bytes_sent; // number of bytes sent from transmitPacket
byte state; // wave generator state machine
byte pendingPacket[MAX_PACKET_SIZE];
byte pendingLength;
byte pendingRepeats;
int lastCurrent;
// current sampling
POWERMODE powerMode;
unsigned long lastSampleTaken;
unsigned int sampleDelay;
int rawCurrentTripValue;
// ACK management (Prog track only)
bool ackPending;
bool ackDetected;
int ackThreshold;
int ackMaxCurrent;
unsigned long ackCheckStart; // millis
unsigned int ackCheckDuration; // millis
unsigned int ackPulseDuration; // micros
unsigned long ackPulseStart; // micros
};
#endif