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CommandStation-EX/DCCACK.cpp

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/*
* © 2021 M Steve Todd
* © 2021 Mike S
* © 2021 Fred Decker
* © 2020-2021 Harald Barth
* © 2020-2022 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/>.
*/
#include "DCCACK.h"
#include "DIAG.h"
#include "DCC.h"
#include "DCCWaveform.h"
#include "TrackManager.h"
unsigned int DCCACK::minAckPulseDuration = 2000; // micros
unsigned int DCCACK::maxAckPulseDuration = 20000; // micros
MotorDriver * DCCACK::progDriver=NULL;
ackOp const * DCCACK::ackManagerProg;
ackOp const * DCCACK::ackManagerProgStart;
byte DCCACK::ackManagerByte;
byte DCCACK::ackManagerByteVerify;
byte DCCACK::ackManagerStash;
int DCCACK::ackManagerWord;
byte DCCACK::ackManagerRetry;
byte DCCACK::ackRetry = 2;
int16_t DCCACK::ackRetrySum;
int16_t DCCACK::ackRetryPSum;
int DCCACK::ackManagerCv;
byte DCCACK::ackManagerBitNum;
bool DCCACK::ackReceived;
bool DCCACK::ackManagerRejoin;
volatile uint8_t DCCACK::numAckGaps=0;
volatile uint8_t DCCACK::numAckSamples=0;
uint8_t DCCACK::trailingEdgeCounter=0;
unsigned int DCCACK::ackPulseDuration; // micros
unsigned long DCCACK::ackPulseStart; // micros
volatile bool DCCACK::ackDetected;
unsigned long DCCACK::ackCheckStart; // millis
volatile bool DCCACK::ackPending;
bool DCCACK::autoPowerOff;
int DCCACK::ackThreshold;
int DCCACK::ackLimitmA = 50;
int DCCACK::ackMaxCurrent;
unsigned int DCCACK::ackCheckDuration; // millis
CALLBACK_STATE DCCACK::callbackState=READY;
ACK_CALLBACK DCCACK::ackManagerCallback;
void DCCACK::Setup(int cv, byte byteValueOrBitnum, ackOp const program[], ACK_CALLBACK callback) {
ackManagerRejoin=TrackManager::isJoined();
if (ackManagerRejoin) {
// Change from JOIN must zero resets packet.
TrackManager::setJoin(false);
DCCWaveform::progTrack.clearResets();
}
progDriver=TrackManager::getProgDriver();
if (progDriver==NULL) {
TrackManager::setJoin(ackManagerRejoin);
callback(-3); // we dont have a prog track!
return;
}
if (!progDriver->canMeasureCurrent()) {
TrackManager::setJoin(ackManagerRejoin);
callback(-2); // our prog track cant measure current
return;
}
autoPowerOff=false;
if (progDriver->getPower() == POWERMODE::OFF) {
autoPowerOff=true; // power off afterwards
if (Diag::ACK) DIAG(F("Auto Prog power on"));
progDriver->setPower(POWERMODE::ON);
/* TODO !!! in MotorDriver surely!
if (MotorDriver::commonFaultPin)
DCCWaveform::mainTrack.setPowerMode(POWERMODE::ON);
DCCWaveform::progTrack.clearResets();
**/
}
ackManagerCv = cv;
ackManagerProg = program;
ackManagerProgStart = program;
ackManagerRetry = ackRetry;
ackManagerByte = byteValueOrBitnum;
ackManagerByteVerify = byteValueOrBitnum;
ackManagerBitNum=byteValueOrBitnum;
ackManagerCallback = callback;
}
void DCCACK::Setup(int wordval, ackOp const program[], ACK_CALLBACK callback) {
ackManagerWord=wordval;
Setup(0, 0, program, callback);
}
const byte RESET_MIN=8; // tuning of reset counter before sending message
// checkRessets return true if the caller should yield back to loop and try later.
bool DCCACK::checkResets(uint8_t numResets) {
return DCCWaveform::progTrack.getResets() < numResets;
}
// Operations applicable to PROG track ONLY.
// (yes I know I could have subclassed the main track but...)
void DCCACK::setAckBaseline() {
int baseline=progDriver->getCurrentRaw();
ackThreshold= baseline + progDriver->mA2raw(ackLimitmA);
if (Diag::ACK) DIAG(F("ACK baseline=%d/%dmA Threshold=%d/%dmA Duration between %uus and %uus"),
baseline,progDriver->raw2mA(baseline),
ackThreshold,progDriver->raw2mA(ackThreshold),
minAckPulseDuration, maxAckPulseDuration);
}
void DCCACK::setAckPending() {
ackMaxCurrent=0;
ackPulseStart=0;
ackPulseDuration=0;
ackDetected=false;
ackCheckStart=millis();
numAckSamples=0;
numAckGaps=0;
ackPending=true; // interrupt routines will now take note
}
byte DCCACK::getAck() {
if (ackPending) return (2); // still waiting
if (Diag::ACK) DIAG(F("%S after %dmS max=%d/%dmA pulse=%uuS samples=%d gaps=%d"),ackDetected?F("ACK"):F("NO-ACK"), ackCheckDuration,
ackMaxCurrent,progDriver->raw2mA(ackMaxCurrent), ackPulseDuration, numAckSamples, numAckGaps);
if (ackDetected) return (1); // Yes we had an ack
return(0); // pending set off but not detected means no ACK.
}
#ifndef DISABLE_PROG
void DCCACK::loop() {
while (ackManagerProg) {
byte opcode=GETFLASH(ackManagerProg);
// breaks from this switch will step to next prog entry
// returns from this switch will stay on same entry
// (typically waiting for a reset counter or ACK waiting, or when all finished.)
switch (opcode) {
case BASELINE:
if (progDriver->getPower()==POWERMODE::OVERLOAD) return;
if (checkResets(autoPowerOff || ackManagerRejoin ? 20 : 3)) return;
setAckBaseline();
callbackState=AFTER_READ;
break;
case W0: // write 0 bit
case W1: // write 1 bit
{
if (checkResets(RESET_MIN)) return;
if (Diag::ACK) DIAG(F("W%d cv=%d bit=%d"),opcode==W1, ackManagerCv,ackManagerBitNum);
byte instruction = WRITE_BIT | (opcode==W1 ? BIT_ON : BIT_OFF) | ackManagerBitNum;
byte message[] = {DCC::cv1(BIT_MANIPULATE, ackManagerCv), DCC::cv2(ackManagerCv), instruction };
DCCWaveform::progTrack.schedulePacket(message, sizeof(message), PROG_REPEATS);
setAckPending();
callbackState=AFTER_WRITE;
}
break;
case WB: // write byte
{
if (checkResets( RESET_MIN)) return;
if (Diag::ACK) DIAG(F("WB cv=%d value=%d"),ackManagerCv,ackManagerByte);
byte message[] = {DCC::cv1(WRITE_BYTE, ackManagerCv), DCC::cv2(ackManagerCv), ackManagerByte};
DCCWaveform::progTrack.schedulePacket(message, sizeof(message), PROG_REPEATS);
setAckPending();
callbackState=AFTER_WRITE;
}
break;
case VB: // Issue validate Byte packet
{
if (checkResets( RESET_MIN)) return;
if (Diag::ACK) DIAG(F("VB cv=%d value=%d"),ackManagerCv,ackManagerByte);
byte message[] = { DCC::cv1(VERIFY_BYTE, ackManagerCv), DCC::cv2(ackManagerCv), ackManagerByte};
DCCWaveform::progTrack.schedulePacket(message, sizeof(message), PROG_REPEATS);
setAckPending();
}
break;
case V0:
case V1: // Issue validate bit=0 or bit=1 packet
{
if (checkResets(RESET_MIN)) return;
if (Diag::ACK) DIAG(F("V%d cv=%d bit=%d"),opcode==V1, ackManagerCv,ackManagerBitNum);
byte instruction = VERIFY_BIT | (opcode==V0?BIT_OFF:BIT_ON) | ackManagerBitNum;
byte message[] = {DCC::cv1(BIT_MANIPULATE, ackManagerCv), DCC::cv2(ackManagerCv), instruction };
DCCWaveform::progTrack.schedulePacket(message, sizeof(message), PROG_REPEATS);
setAckPending();
}
break;
case WACK: // wait for ack (or absence of ack)
{
byte ackState=2; // keep polling
ackState=getAck();
if (ackState==2) return; // keep polling
ackReceived=ackState==1;
break; // we have a genuine ACK result
}
case ITC0:
case ITC1: // If True Callback(0 or 1) (if prevous WACK got an ACK)
if (ackReceived) {
callback(opcode==ITC0?0:1);
return;
}
break;
case ITCB: // If True callback(byte)
if (ackReceived) {
callback(ackManagerByte);
return;
}
break;
case ITCBV: // If True callback(byte) - Verify
if (ackReceived) {
if (ackManagerByte == ackManagerByteVerify) {
ackRetrySum ++;
LCD(1, F("v %d %d Sum=%d"), ackManagerCv, ackManagerByte, ackRetrySum);
}
callback(ackManagerByte);
return;
}
break;
case ITCB7: // If True callback(byte & 0x7F)
if (ackReceived) {
callback(ackManagerByte & 0x7F);
return;
}
break;
case NAKFAIL: // If nack callback(-1)
if (!ackReceived) {
callback(-1);
return;
}
break;
case CALLFAIL: // callback(-1)
callback(-1);
return;
case BIV: // ackManagerByte initial value
ackManagerByte = ackManagerByteVerify;
break;
case STARTMERGE:
ackManagerBitNum=7;
ackManagerByte=0;
break;
case MERGE: // Merge previous Validate zero wack response with byte value and update bit number (use for reading CV bytes)
ackManagerByte <<= 1;
// ackReceived means bit is zero.
if (!ackReceived) ackManagerByte |= 1;
ackManagerBitNum--;
break;
case SETBIT:
ackManagerProg++;
ackManagerBitNum=GETFLASH(ackManagerProg);
break;
case SETCV:
ackManagerProg++;
ackManagerCv=GETFLASH(ackManagerProg);
break;
case SETBYTE:
ackManagerProg++;
ackManagerByte=GETFLASH(ackManagerProg);
break;
case SETBYTEH:
ackManagerByte=highByte(ackManagerWord);
break;
case SETBYTEL:
ackManagerByte=lowByte(ackManagerWord);
break;
case STASHLOCOID:
ackManagerStash=ackManagerByte; // stash value from CV17
break;
case COMBINELOCOID:
// ackManagerStash is cv17, ackManagerByte is CV 18
callback( LONG_ADDR_MARKER | ( ackManagerByte + ((ackManagerStash - 192) << 8)));
return;
case ITSKIP:
if (!ackReceived) break;
// SKIP opcodes until SKIPTARGET found
while (opcode!=SKIPTARGET) {
ackManagerProg++;
opcode=GETFLASH(ackManagerProg);
}
break;
case SKIPTARGET:
break;
default:
DIAG(F("!! ackOp %d FAULT!!"),opcode);
callback( -1);
return;
} // end of switch
ackManagerProg++;
}
}
void DCCACK::callback(int value) {
// check for automatic retry
if (value == -1 && ackManagerRetry > 0) {
ackRetrySum ++;
LCD(0, F("Retry %d %d Sum=%d"), ackManagerCv, ackManagerRetry, ackRetrySum);
ackManagerRetry --;
ackManagerProg = ackManagerProgStart;
return;
}
static unsigned long callbackStart;
// We are about to leave programming mode
// Rule 1: If we have written to a decoder we must maintain power for 100mS
// Rule 2: If we are re-joining the main track we must power off for 30mS
switch (callbackState) {
case AFTER_READ:
if (ackManagerRejoin && !autoPowerOff) {
progDriver->setPower(POWERMODE::OFF);
callbackStart=millis();
callbackState=WAITING_30;
if (Diag::ACK) DIAG(F("OFF 30mS"));
} else {
callbackState=READY;
}
break;
case AFTER_WRITE: // first attempt to callback after a write operation
if (!ackManagerRejoin && !autoPowerOff) {
callbackState=READY;
break;
} // lines 906-910 added. avoid wait after write. use 1 PROG
callbackStart=millis();
callbackState=WAITING_100;
if (Diag::ACK) DIAG(F("Stable 100mS"));
break;
case WAITING_100: // waiting for 100mS
if (millis()-callbackStart < 100) break;
// stable after power maintained for 100mS
// If we are going to power off anyway, it doesnt matter
// but if we will keep the power on, we must off it for 30mS
if (autoPowerOff) callbackState=READY;
else { // Need to cycle power off and on
progDriver->setPower(POWERMODE::OFF);
callbackStart=millis();
callbackState=WAITING_30;
if (Diag::ACK) DIAG(F("OFF 30mS"));
}
break;
case WAITING_30: // waiting for 30mS with power off
if (millis()-callbackStart < 30) break;
//power has been off for 30mS
progDriver->setPower(POWERMODE::ON);
callbackState=READY;
break;
case READY: // ready after read, or write after power delay and off period.
// power off if we powered it on
if (autoPowerOff) {
if (Diag::ACK) DIAG(F("Auto Prog power off"));
progDriver->setPower(POWERMODE::OFF);
/* TODO
if (MotorDriver::commonFaultPin)
DCCWaveform::mainTrack.setPowerMode(POWERMODE::OFF);
**/
}
// Restore <1 JOIN> to state before BASELINE
if (ackManagerRejoin) {
TrackManager::setJoin(true);
if (Diag::ACK) DIAG(F("Auto JOIN"));
}
ackManagerProg=NULL; // no more steps to execute
if (Diag::ACK) DIAG(F("Callback(%d)"),value);
(ackManagerCallback)( value);
}
}
#endif
void DCCACK::checkAck(byte sentResetsSincePacket) {
if (!ackPending) return;
// This function operates in interrupt() time so must be fast and can't DIAG
if (sentResetsSincePacket > 6) { //ACK timeout
ackCheckDuration=millis()-ackCheckStart;
ackPending = false;
return;
}
int current=progDriver->getCurrentRaw(true); // true means "from interrupt"
numAckSamples++;
if (current > ackMaxCurrent) ackMaxCurrent=current;
// An ACK is a pulse lasting between minAckPulseDuration and maxAckPulseDuration uSecs (refer @haba)
if (current>ackThreshold) {
if (trailingEdgeCounter > 0) {
numAckGaps++;
trailingEdgeCounter = 0;
}
if (ackPulseStart==0) ackPulseStart=micros(); // leading edge of pulse detected
return;
}
// not in pulse
if (ackPulseStart==0) return; // keep waiting for leading edge
// if we reach to this point, we have
// detected trailing edge of pulse
if (trailingEdgeCounter == 0) {
ackPulseDuration=micros()-ackPulseStart;
}
// but we do not trust it yet and return (which will force another
// measurement) and first the third time around with low current
// the ack detection will be finalized.
if (trailingEdgeCounter < 2) {
trailingEdgeCounter++;
return;
}
trailingEdgeCounter = 0;
if (ackPulseDuration>=minAckPulseDuration && ackPulseDuration<=maxAckPulseDuration) {
ackCheckDuration=millis()-ackCheckStart;
ackDetected=true;
ackPending=false;
DCCWaveform::progTrack.clearRepeats(); // shortcut remaining repeat packets
return; // we have a genuine ACK result
}
ackPulseStart=0; // We have detected a too-short or too-long pulse so ignore and wait for next leading edge
}
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