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Rauilcom cutout

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This commit is contained in:
Asbelos 2020-05-24 10:27:33 +01:00
parent 76d7be0ef8
commit 0b9f4cf574
2 changed files with 99 additions and 69 deletions
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30
DCCWaveform.cpp
View File

@ -59,11 +59,19 @@ DCCWaveform::DCCWaveform(byte powerPinNo, byte directionPinNo, byte sensePinNo,
bytes_sent=0;
bits_sent=0;
nextSampleDue=0;
}
void DCCWaveform::beginTrack() {
pinMode2f(powerPin,OUTPUT);
pinMode2f(directionPin,OUTPUT);
pinMode(sensePin,INPUT);
if (isMainTrack && RAILCOM_CUTOUT) {
railcomBrakePin=Arduino_to_GPIO_pin(RAILCOM_BRAKE_PIN);
pinMode2f(railcomBrakePin, OUTPUT);
digitalWrite2f(railcomBrakePin, LOW);
}
setPowerMode(POWERMODE::ON);
DIAG(F("\nTrack started sensePin=%d\n"),sensePin);
}
@ -121,20 +129,23 @@ bool DCCWaveform::interrupt1() {
switch (state) {
case 0: // start of bit transmission
digitalWrite2f(directionPin, HIGH);
checkRailcom();
state = 1;
return true; // must call interrupt2
return true; // must call interrupt2 to set currentBit
case 1: // 58Ms after case 0
case 1: // 58us after case 0
if (currentBit) {
digitalWrite2f(directionPin, LOW);
state = 0;
}
else state = 2;
break;
case 2: digitalWrite2f(directionPin, LOW);
case 2: // 116us after case 0
digitalWrite2f(directionPin, LOW);
state = 3;
break;
case 3: state = 0;
case 3: // finished sending zero bit
state = 0;
break;
}
return false;
@ -187,6 +198,17 @@ void DCCWaveform::interrupt2() {
}
}
void DCCWaveform::checkRailcom() {
if (isMainTrack && RAILCOM_CUTOUT) {
byte preamble=PREAMBLE_BITS_MAIN - remainingPreambles;
if (preamble == RAILCOM_PREAMBLES_BEFORE_CUTOUT) {
digitalWrite2f(railcomBrakePin,HIGH);
}
else if (preamble== RAILCOM_PREAMBLES_BEFORE_CUTOUT+RAILCOM_PREAMBLES_SKIPPED_IN_CUTOUT) {
digitalWrite2f(railcomBrakePin,LOW);
}
}
}
// Wait until there is no packet pending, then make this pending
void DCCWaveform::schedulePacket(const byte buffer[], byte byteCount, byte repeats) {

22
DCCWaveform.h
View File

@ -19,9 +19,17 @@ const int ACK_TIMEOUT = 25 ; // millis getAck is prepared to wait for a signa
const int ACK_MAX_NOT_PULSE = 10 ; // current below which this is NOT a pulse any more
const int ACK_MIN_PULSE = 50 ; // current above which a pulse is recognised
const int PREAMBLE_BITS_MAIN=16;
const int PREAMBLE_BITS_MAIN = 20;
const int PREAMBLE_BITS_PROG = 22;
// Railcom settings
const bool RAILCOM_CUTOUT = true;
const byte RAILCOM_PREAMBLES_BEFORE_CUTOUT = 1; // how far into the preamble do we cutout
const byte RAILCOM_PREAMBLES_SKIPPED_IN_CUTOUT = 5;
const byte RAILCOM_BRAKE_PIN = 9;
const byte MAX_PACKET_SIZE = 12;
// NOTE: static functions are used for the overall controller, then
// one instance is created for each track.
@ -57,7 +65,7 @@ class DCCWaveform {
bool interrupt1();
void interrupt2();
POWERMODE powerMode;
bool isMainTrack;
// Transmission controller
byte transmitPacket[MAX_PACKET_SIZE]; // packet being transmitted
@ -66,24 +74,24 @@ class DCCWaveform {
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
void checkRailcom();
byte pendingPacket[MAX_PACKET_SIZE];
byte pendingLength;
byte pendingRepeats;
// Hardware pins
// Hardware fast pins
GPIO_pin_t directionPin;
GPIO_pin_t powerPin;
GPIO_pin_t railcomBrakePin;
// current sampling
bool isMainTrack;
POWERMODE powerMode;
byte sensePin;
unsigned long nextSampleDue;
int ackBaseCurrent;
};