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https://github.com/DCC-EX/CommandStation-EX.git
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ddc55690f3
Add function to maintain a minimum value seen of free memory. Add call to it in DCCWaveform interrupt handler (assumed to be the likely worst case for stack usage). Report this minimum value in main loop.
337 lines
12 KiB
C++
337 lines
12 KiB
C++
/*
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* © 2020, Chris Harlow. All rights reserved.
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* © 2020, Harald Barth.
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*
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* This file is part of Asbelos DCC API
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*
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* This is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* It is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with CommandStation. If not, see <https://www.gnu.org/licenses/>.
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*/
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#pragma GCC optimize ("-O3")
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#include <Arduino.h>
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#include "DCCWaveform.h"
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#include "DCCTimer.h"
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#include "DIAG.h"
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#include "freeMemory.h"
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DCCWaveform DCCWaveform::mainTrack(PREAMBLE_BITS_MAIN, true);
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DCCWaveform DCCWaveform::progTrack(PREAMBLE_BITS_PROG, false);
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bool DCCWaveform::progTrackSyncMain=false;
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bool DCCWaveform::progTrackBoosted=false;
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int DCCWaveform::progTripValue=0;
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void DCCWaveform::begin(MotorDriver * mainDriver, MotorDriver * progDriver) {
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mainTrack.motorDriver=mainDriver;
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progTrack.motorDriver=progDriver;
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progTripValue = progDriver->mA2raw(TRIP_CURRENT_PROG); // need only calculate once hence static
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mainTrack.setPowerMode(POWERMODE::OFF);
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progTrack.setPowerMode(POWERMODE::OFF);
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// Fault pin config for odd motor boards (example pololu)
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MotorDriver::commonFaultPin = ((mainDriver->getFaultPin() == progDriver->getFaultPin())
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&& (mainDriver->getFaultPin() != UNUSED_PIN));
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// Only use PWM if both pins are PWM capable. Otherwise JOIN does not work
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MotorDriver::usePWM= mainDriver->isPWMCapable() && progDriver->isPWMCapable();
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if (MotorDriver::usePWM)
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DIAG(F("\nWaveform using PWM pins for accuracy."));
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else
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DIAG(F("\nWaveform accuracy limited by signal pin configuration."));
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DCCTimer::begin(DCCWaveform::interruptHandler);
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}
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void DCCWaveform::loop(bool ackManagerActive) {
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mainTrack.checkPowerOverload(false);
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progTrack.checkPowerOverload(ackManagerActive);
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}
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void DCCWaveform::interruptHandler() {
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// call the timer edge sensitive actions for progtrack and maintrack
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// member functions would be cleaner but have more overhead
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byte sigMain=signalTransform[mainTrack.state];
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byte sigProg=progTrackSyncMain? sigMain : signalTransform[progTrack.state];
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// Set the signal state for both tracks
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mainTrack.motorDriver->setSignal(sigMain);
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progTrack.motorDriver->setSignal(sigProg);
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// Move on in the state engine
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mainTrack.state=stateTransform[mainTrack.state];
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progTrack.state=stateTransform[progTrack.state];
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// WAVE_PENDING means we dont yet know what the next bit is
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if (mainTrack.state==WAVE_PENDING) mainTrack.interrupt2();
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if (progTrack.state==WAVE_PENDING) progTrack.interrupt2();
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else if (progTrack.ackPending) progTrack.checkAck();
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}
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// An instance of this class handles the DCC transmissions for one track. (main or prog)
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// Interrupts are marshalled via the statics.
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// A track has a current transmit buffer, and a pending buffer.
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// When the current buffer is exhausted, either the pending buffer (if there is one waiting) or an idle buffer.
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// This bitmask has 9 entries as each byte is trasmitted as a zero + 8 bits.
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const byte bitMask[] = {0x00, 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01};
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DCCWaveform::DCCWaveform( byte preambleBits, bool isMain) {
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isMainTrack = isMain;
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packetPending = false;
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memcpy(transmitPacket, idlePacket, sizeof(idlePacket));
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state = WAVE_START;
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// The +1 below is to allow the preamble generator to create the stop bit
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// for the previous packet.
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requiredPreambles = preambleBits+1;
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bytes_sent = 0;
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bits_sent = 0;
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sampleDelay = 0;
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lastSampleTaken = millis();
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ackPending=false;
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}
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POWERMODE DCCWaveform::getPowerMode() {
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return powerMode;
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}
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void DCCWaveform::setPowerMode(POWERMODE mode) {
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powerMode = mode;
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bool ison = (mode == POWERMODE::ON);
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motorDriver->setPower( ison);
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}
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void DCCWaveform::checkPowerOverload(bool ackManagerActive) {
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if (millis() - lastSampleTaken < sampleDelay) return;
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lastSampleTaken = millis();
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int tripValue= motorDriver->getRawCurrentTripValue();
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if (!isMainTrack && !ackManagerActive && !progTrackSyncMain && !progTrackBoosted)
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tripValue=progTripValue;
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switch (powerMode) {
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case POWERMODE::OFF:
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sampleDelay = POWER_SAMPLE_OFF_WAIT;
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break;
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case POWERMODE::ON:
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// Check current
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lastCurrent=motorDriver->getCurrentRaw();
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if (lastCurrent < 0) {
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// We have a fault pin condition to take care of
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lastCurrent = -lastCurrent;
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setPowerMode(POWERMODE::OVERLOAD); // Turn off, decide later how fast to turn on again
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if (MotorDriver::commonFaultPin) {
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if (lastCurrent <= tripValue) {
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setPowerMode(POWERMODE::ON); // maybe other track
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}
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// Write this after the fact as we want to turn on as fast as possible
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// because we don't know which output actually triggered the fault pin
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DIAG(F("\n*** COMMON FAULT PIN ACTIVE - TOGGLED POWER on %S ***\n"), isMainTrack ? F("MAIN") : F("PROG"));
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} else {
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DIAG(F("\n*** %S FAULT PIN ACTIVE - OVERLOAD ***\n"), isMainTrack ? F("MAIN") : F("PROG"));
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if (lastCurrent < tripValue) {
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lastCurrent = tripValue; // exaggerate
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}
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}
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}
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if (lastCurrent < tripValue) {
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sampleDelay = POWER_SAMPLE_ON_WAIT;
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if(power_good_counter<100)
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power_good_counter++;
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else
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if (power_sample_overload_wait>POWER_SAMPLE_OVERLOAD_WAIT) power_sample_overload_wait=POWER_SAMPLE_OVERLOAD_WAIT;
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} else {
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setPowerMode(POWERMODE::OVERLOAD);
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unsigned int mA=motorDriver->raw2mA(lastCurrent);
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unsigned int maxmA=motorDriver->raw2mA(tripValue);
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power_good_counter=0;
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sampleDelay = power_sample_overload_wait;
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DIAG(F("\n*** %S TRACK POWER OVERLOAD current=%d max=%d offtime=%d ***\n"), isMainTrack ? F("MAIN") : F("PROG"), mA, maxmA, sampleDelay);
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if (power_sample_overload_wait >= 10000)
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power_sample_overload_wait = 10000;
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else
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power_sample_overload_wait *= 2;
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}
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break;
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case POWERMODE::OVERLOAD:
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// Try setting it back on after the OVERLOAD_WAIT
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setPowerMode(POWERMODE::ON);
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sampleDelay = POWER_SAMPLE_ON_WAIT;
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// Debug code....
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DIAG(F("\n*** %S TRACK POWER RESET delay=%d ***\n"), isMainTrack ? F("MAIN") : F("PROG"), sampleDelay);
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break;
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default:
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sampleDelay = 999; // cant get here..meaningless statement to avoid compiler warning.
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}
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}
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// For each state of the wave nextState=stateTransform[currentState]
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const WAVE_STATE DCCWaveform::stateTransform[]={
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/* WAVE_START -> */ WAVE_PENDING,
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/* WAVE_MID_1 -> */ WAVE_START,
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/* WAVE_HIGH_0 -> */ WAVE_MID_0,
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/* WAVE_MID_0 -> */ WAVE_LOW_0,
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/* WAVE_LOW_0 -> */ WAVE_START,
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/* WAVE_PENDING (should not happen) -> */ WAVE_PENDING};
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// For each state of the wave, signal pin is HIGH or LOW
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const bool DCCWaveform::signalTransform[]={
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/* WAVE_START -> */ HIGH,
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/* WAVE_MID_1 -> */ LOW,
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/* WAVE_HIGH_0 -> */ HIGH,
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/* WAVE_MID_0 -> */ LOW,
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/* WAVE_LOW_0 -> */ LOW,
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/* WAVE_PENDING (should not happen) -> */ LOW};
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void DCCWaveform::interrupt2() {
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// calculate the next bit to be sent:
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// set state WAVE_MID_1 for a 1=bit
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// or WAVE_HIGH_0 for a 0 bit.
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if (remainingPreambles > 0 ) {
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state=WAVE_MID_1; // switch state to trigger LOW on next interrupt
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remainingPreambles--;
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// Update free memory diagnostic as we don't have anything else to do this time.
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// Allow for checkAck and its called functions using 22 bytes more.
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updateMinimumFreeMemory(22);
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return;
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}
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// Wave has gone HIGH but what happens next depends on the bit to be transmitted
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// beware OF 9-BIT MASK generating a zero to start each byte
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state=(transmitPacket[bytes_sent] & bitMask[bits_sent])? WAVE_MID_1 : WAVE_HIGH_0;
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bits_sent++;
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// If this is the last bit of a byte, prepare for the next byte
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if (bits_sent == 9) { // zero followed by 8 bits of a byte
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//end of Byte
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bits_sent = 0;
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bytes_sent++;
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// if this is the last byte, prepere for next packet
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if (bytes_sent >= transmitLength) {
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// end of transmission buffer... repeat or switch to next message
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bytes_sent = 0;
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remainingPreambles = requiredPreambles;
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if (transmitRepeats > 0) {
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transmitRepeats--;
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}
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else if (packetPending) {
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// Copy pending packet to transmit packet
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// a fixed length memcpy is faster than a variable length loop for these small lengths
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// for (int b = 0; b < pendingLength; b++) transmitPacket[b] = pendingPacket[b];
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memcpy( transmitPacket, pendingPacket, sizeof(pendingPacket));
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transmitLength = pendingLength;
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transmitRepeats = pendingRepeats;
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packetPending = false;
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sentResetsSincePacket=0;
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}
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else {
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// Fortunately reset and idle packets are the same length
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memcpy( transmitPacket, isMainTrack ? idlePacket : resetPacket, sizeof(idlePacket));
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transmitLength = sizeof(idlePacket);
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transmitRepeats = 0;
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if (sentResetsSincePacket<250) sentResetsSincePacket++;
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}
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}
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}
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}
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// Wait until there is no packet pending, then make this pending
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void DCCWaveform::schedulePacket(const byte buffer[], byte byteCount, byte repeats) {
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if (byteCount >= MAX_PACKET_SIZE) return; // allow for chksum
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while (packetPending);
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byte checksum = 0;
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for (byte b = 0; b < byteCount; b++) {
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checksum ^= buffer[b];
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pendingPacket[b] = buffer[b];
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}
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pendingPacket[byteCount] = checksum;
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pendingLength = byteCount + 1;
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pendingRepeats = repeats;
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packetPending = true;
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sentResetsSincePacket=0;
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}
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// Operations applicable to PROG track ONLY.
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// (yes I know I could have subclassed the main track but...)
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void DCCWaveform::setAckBaseline() {
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if (isMainTrack) return;
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int baseline=motorDriver->getCurrentRaw();
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ackThreshold= baseline + motorDriver->mA2raw(ackLimitmA);
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if (Diag::ACK) DIAG(F("\nACK baseline=%d/%dmA Threshold=%d/%dmA Duration: %dus <= pulse <= %dus"),
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baseline,motorDriver->raw2mA(baseline),
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ackThreshold,motorDriver->raw2mA(ackThreshold),
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minAckPulseDuration, maxAckPulseDuration);
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}
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void DCCWaveform::setAckPending() {
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if (isMainTrack) return;
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ackMaxCurrent=0;
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ackPulseStart=0;
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ackPulseDuration=0;
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ackDetected=false;
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ackCheckStart=millis();
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ackPending=true; // interrupt routines will now take note
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}
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byte DCCWaveform::getAck() {
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if (ackPending) return (2); // still waiting
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if (Diag::ACK) DIAG(F("\n%S after %dmS max=%d/%dmA pulse=%duS"),ackDetected?F("ACK"):F("NO-ACK"), ackCheckDuration,
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ackMaxCurrent,motorDriver->raw2mA(ackMaxCurrent), ackPulseDuration);
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if (ackDetected) return (1); // Yes we had an ack
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return(0); // pending set off but not detected means no ACK.
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}
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void DCCWaveform::checkAck() {
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// This function operates in interrupt() time so must be fast and can't DIAG
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if (sentResetsSincePacket > 6) { //ACK timeout
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ackCheckDuration=millis()-ackCheckStart;
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ackPending = false;
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return;
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}
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int current=motorDriver->getCurrentRaw();
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if (current > ackMaxCurrent) ackMaxCurrent=current;
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// An ACK is a pulse lasting between minAckPulseDuration and maxAckPulseDuration uSecs (refer @haba)
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if (current>ackThreshold) {
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if (ackPulseStart==0) ackPulseStart=micros(); // leading edge of pulse detected
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return;
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}
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// not in pulse
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if (ackPulseStart==0) return; // keep waiting for leading edge
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// detected trailing edge of pulse
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ackPulseDuration=micros()-ackPulseStart;
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if (ackPulseDuration>=minAckPulseDuration && ackPulseDuration<=maxAckPulseDuration) {
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ackCheckDuration=millis()-ackCheckStart;
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ackDetected=true;
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ackPending=false;
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transmitRepeats=0; // shortcut remaining repeat packets
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return; // we have a genuine ACK result
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}
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ackPulseStart=0; // We have detected a too-short or too-long pulse so ignore and wait for next leading edge
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}
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