415 lines
9.8 KiB
C++
415 lines
9.8 KiB
C++
#include <LiquidCrystal_I2C.h>
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LiquidCrystal_I2C lcd(0x27, 16, 2);
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#define SERIAL_RATE 115200
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#define WWV_SIGNAL_PIN 14
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#define PPS_OUTPUT_PIN 16
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#define DEBUG1_OUTPUT_PIN 15
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#define ONEBIT 1
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#define ZEROBIT 2
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#define MARKBIT 3
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#define DEBUG false
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#define CLOCKS_PER_MS 10
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#define PPS_PULSEWIDTH_MS 100
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char statusString[25] = "LOS";
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volatile unsigned int lowLatencyInState;
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volatile unsigned int wwvbInState;
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volatile unsigned int lastWWVBInState;
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volatile unsigned int stateStableCounter = 0;
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volatile unsigned int stateStableMillis = 0;
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volatile unsigned int lastStateStableMillis = 0;
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volatile unsigned int secondCounter = 0;
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volatile unsigned int milliCounter = 0;
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volatile unsigned int clockCounter = 0;
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volatile unsigned int highFor = 0;
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volatile unsigned int lowFor = 0;
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volatile unsigned int lastBitHighMS = 0;
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volatile unsigned int timeToTick = 0;
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volatile unsigned int frameSamples = 0;
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volatile unsigned int lossOfSignal = 1;
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volatile unsigned int displayUpdateRequired = 1;
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volatile unsigned int waitingForSecond = 0;
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volatile unsigned int frameStart = 0;
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volatile unsigned int frameStartTime = 0;
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volatile unsigned int frameCounter = 0;
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volatile unsigned int bitReadyForRead = 0;
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volatile unsigned int lastBitReceived = 0;
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volatile unsigned int millisSinceBoot = 0;
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volatile unsigned int ppsActivationTime = 0;
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volatile unsigned int millisSinceSignalStateChange = 0;
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volatile unsigned int minuteSync = 0;
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void ICACHE_RAM_ATTR TimerHandler();
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void ICACHE_RAM_ATTR MilliEdge();
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void ICACHE_RAM_ATTR SecondEdge();
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#include "ESP8266TimerInterrupt.h"
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ESP8266Timer ITimer;
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void setup() {
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Serial.begin(SERIAL_RATE);
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while (!Serial);
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delay(200);
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Serial.print("\n\n\n");
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Serial.println("************************************************");
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Serial.println("************************************************");
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Serial.println("*** ESP8266 Ready.");
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Serial.println("************************************************");
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Serial.println("************************************************");
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Serial.print("\n\n\n");
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Serial.print(F("*** Starting WWVB on "));
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Serial.println(ARDUINO_BOARD);
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Serial.println(ESP8266_TIMER_INTERRUPT_VERSION);
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Serial.print(F("*** CPU Frequency = "));
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Serial.print(F_CPU / 1000000);
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Serial.println(F(" MHz"));
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pinMode(LED_BUILTIN, OUTPUT);
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pinMode(PPS_OUTPUT_PIN, OUTPUT);
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pinMode(DEBUG1_OUTPUT_PIN, OUTPUT);
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pinMode(WWV_SIGNAL_PIN, INPUT);
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// 100us timer:
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if (ITimer.attachInterruptInterval(100, TimerHandler)) {
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Serial.print(F("Starting ITimer OK, millis() = "));
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Serial.println(millis());
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} else {
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Serial.println(
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F("Can't set ITimer. Select another freq. or timer")
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);
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}
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lcd.init();
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lcd.backlight();
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lcd.setCursor(0, 0);
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lcd.print("booting");
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}
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void TimerHandler() {
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clockCounter++;
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// *****************************************************************
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// *****************************************************************
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// LOW LATENCY HACK to respond in 100us to a falling start-of-second
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// edge respond really fast to a falling edge if in the waitingForSecond
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// state
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//lowLatencyInState = digitalRead(WWV_SIGNAL_PIN);
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wwvbInState = digitalRead(WWV_SIGNAL_PIN);
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// *****************************************************************
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// *****************************************************************
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if(clockCounter > CLOCKS_PER_MS) {
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clockCounter -= CLOCKS_PER_MS;
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MilliEdge();
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}
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}
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void SecondEdge() {
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secondCounter++;
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displayUpdateRequired = 1;
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}
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void MilliEdge() {
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milliCounter++;
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millisSinceBoot++;
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wwvbInState = digitalRead(WWV_SIGNAL_PIN);
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if(waitingForSecond && !wwvbInState) {
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// TICK! falling edge, beginning of a new frame and second
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// FIXME reenable pps
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//digitalWrite(PPS_OUTPUT_PIN, 1);
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waitingForSecond = 0;
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timeToTick = 1;
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lastBitHighMS = highFor;
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bitReadyForRead = 1;
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return;
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}
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if(milliCounter > 1000) {
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milliCounter -= 1000;
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SecondEdge();
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}
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if(wwvbInState != lastWWVBInState) {
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// any edge indicates we have some signal
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lossOfSignal = 0;
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}
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if(wwvbInState && (wwvbInState != lastWWVBInState)) {
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// we are on the rising edge, last low was 1ms ago
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highFor = 0;
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}
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if(!wwvbInState && (wwvbInState != lastWWVBInState)) {
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// we are on the falling edge, last high was 1ms ago
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lowFor = 0;
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}
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if(wwvbInState == lastWWVBInState) {
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if(wwvbInState) {
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highFor++;
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} else {
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lowFor++;
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}
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}
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if(wwvbInState && (highFor > 80) && !lossOfSignal) {
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// if we are high for at least 80ms but no LOS
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// main screen turn on
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// this enables the falling edge low latency detector
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// that happens on a tick
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waitingForSecond = 1;
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}
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if(wwvbInState && (highFor > 2000) && !lossOfSignal) {
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// we have received nothing for 2 seconds, loss of signal:
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lossOfSignal = 1;
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waitingForSecond = 1;
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frameCounter = 0;
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minuteSync = 0;
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}
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lastWWVBInState = wwvbInState; // copy/save for next loop
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}
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char pb[255];
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void loop() {
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digitalWrite(LED_BUILTIN, !wwvbInState);
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if(timeToTick) {
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timeToTick = 0;
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TickSecond();
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}
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if(bitReadyForRead) {
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bitReadyForRead = 0;
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readBit();
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}
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PPSLowIfRequired();
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if (displayUpdateRequired) {
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updateDisplay();
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displayUpdateRequired = 0;
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}
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}
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void SetPPSHigh() {
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digitalWrite(PPS_OUTPUT_PIN, 1);
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}
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void SetPPSLow() {
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digitalWrite(PPS_OUTPUT_PIN, 0);
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}
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void SendPPS() {
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ppsActivationTime = millisSinceBoot;
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SetPPSHigh();
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}
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void PPSLowIfRequired() {
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if ((millisSinceBoot - ppsActivationTime) > PPS_PULSEWIDTH_MS) {
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SetPPSLow();
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}
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}
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void TickSecond() {
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char buf[255];
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sprintf(buf, "*** TICK(%d): WWVB going low after %d ms high (EDGE)\n",
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frameCounter, lastBitHighMS);
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Serial.print(buf);
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SendPPS();
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}
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void readBit() {
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//char buf[255];
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//sprintf(buf, "*** carrier was high for %sms befor \n", lastBitHighMS);
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//Serial.print(buf);
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displayUpdateRequired++;
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registerBit(convertBit(lastBitHighMS));
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}
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int convertBit(unsigned int ms) {
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char buf[255];
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char bitbuf[20];
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int output = 0;
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output = ZEROBIT;
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sprintf(bitbuf, "ZERO");
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if (ms < 800) {
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output = ONEBIT;
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sprintf(bitbuf, "ONE");
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}
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if (ms < 400) {
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output = MARKBIT;
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sprintf(bitbuf, "MARK");
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}
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sprintf(buf, "frame prevHighMs=%s, bit=%s\n", ms, bitbuf);
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Serial.print(buf);
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return output;
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}
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void registerBit(int doot) {
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if (minuteSync) {
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frameCounter++;
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}
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if (doot == MARKBIT) {
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if (lastBitReceived == MARKBIT) {
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// two mark bits in a row means we are in the first second of the minute
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frameCounter = 0;
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minuteSync = 1;
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}
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}
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if (!minuteSync) {
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frameCounter = 0;
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}
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sanityCheckFrame(doot);
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lastBitReceived = doot;
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logBit(doot);
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}
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void logBit(int doot) {
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}
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void lossOfSync(int errorFrame) {
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char buf[255];
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sprintf(buf, "ERROR: %d bit incorrect for framing, loss of sync!\n", errorFrame);
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Serial.print(buf);
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minuteSync = 0;
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displayUpdateRequired++;
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}
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void sanityCheckFrame(int doot) {
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if (
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(
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(frameCounter == 9)
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||
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(frameCounter == 19)
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(frameCounter == 29)
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(frameCounter == 39)
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(frameCounter == 49)
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)
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&& doot != MARKBIT) {
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lossOfSync(frameCounter);
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}
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if (
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(doot == MARKBIT)
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&&
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(
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(frameCounter != 0)
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&&
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(frameCounter != 9)
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&&
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(frameCounter != 19)
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&&
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(frameCounter != 29)
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&&
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(frameCounter != 39)
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&&
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(frameCounter != 49)
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)
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) {
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lossOfSync(frameCounter);
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}
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}
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void updateDisplay() {
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//Serial.print("updateDisplay()\n");
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if (lossOfSignal) {
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sprintf(statusString, "LOS");
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} else {
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sprintf(statusString, "RX(syncing)");
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}
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if (minuteSync) {
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sprintf(statusString, "RX(bit %d)", frameCounter);
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}
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char d[20];
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if (lastBitReceived == MARKBIT) {
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sprintf(d, "%d=MARK", frameCounter);
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}
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if (lastBitReceived == ONEBIT) {
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sprintf(d, "%d=ONE ", frameCounter);
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}
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if (lastBitReceived == ZEROBIT) {
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sprintf(d, "%d=ZERO", frameCounter);
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}
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lcd.clear();
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lcd.setCursor(0, 0);
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char msg[20];
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sprintf(msg, "up:%03d", secondCounter);
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lcd.print(msg);
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lcd.setCursor(0, 1);
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sprintf(msg, "s:%s", statusString);
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lcd.print(msg);
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if (minuteSync) {
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lcd.setCursor(10, 0);
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lcd.print(d);
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}
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if(DEBUG) {
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if(secondCounter % 10 == 0) {
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serialDebug();
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}
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}
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}
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void fastSerialDebug() {
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char buf[255];
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sprintf(buf,"stateStableMillis=%d\n",stateStableMillis);
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Serial.print(buf);
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}
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void serialDebug() {
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char buf[255];
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sprintf(buf,"lossOfSignal=%d\n",lossOfSignal);
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Serial.print(buf);
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sprintf(buf,"waitingForSecond=%d\n",waitingForSecond);
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Serial.print(buf);
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sprintf(buf,"millisSinceBoot=%d\n",millisSinceBoot);
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Serial.print(buf);
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sprintf(buf,"frameStartAge=%d\n",millisSinceBoot-frameStartTime);
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Serial.print(buf);
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sprintf(buf,"secondCounter=%d\n",secondCounter);
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Serial.print(buf);
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sprintf(buf,"timeToTick=%d\n",timeToTick);
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Serial.print(buf);
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sprintf(buf,"highFor=%d\n",highFor);
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Serial.print(buf);
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sprintf(buf,"lowFor=%d\n",lowFor);
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Serial.print(buf);
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}
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