Limp shutdown rebase (#3879)

* limp manager handles engine stop

* use timer

* dead relevant fsio

* this stuff needs its own ticket

* if we can comment out 'business logic' and tests do not fail it's not a great sign :(

Co-authored-by: Matthew Kennedy <matthewkennedy@outlook.com>
Co-authored-by: rusefillc <sdfsdfqsf2334234234>

firmware/controllers/algo/engine.cpp

@@ -354,15 +354,6 @@ Engine::Engine() {
 	reset();
 }
 
-/**
- * @see scheduleStopEngine()
- * @return true if there is a reason to stop engine
- */
-bool Engine::needToStopEngine(efitick_t nowNt) const {
-	return stopEngineRequestTimeNt != 0 &&
-			nowNt - stopEngineRequestTimeNt	< 3 * NT_PER_SECOND;
-}
-
 int Engine::getGlobalConfigurationVersion(void) const {
 	return globalConfigurationVersion;
 }
@@ -537,6 +528,7 @@ void Engine::checkShutdown() {
 	// here we are in the shutdown (the ignition is off) or initial mode (after the firmware fresh start)
 	const efitick_t engineStopWaitTimeoutUs = 500000LL;	// 0.5 sec
 	// in shutdown mode, we need a small cooldown time between the ignition off and on
+/* this needs work or tests
 	if (stopEngineRequestTimeNt == 0 || (getTimeNowNt() - stopEngineRequestTimeNt) > US2NT(engineStopWaitTimeoutUs)) {
 		// if the ignition key is turned on again,
 		// we cancel the shutdown mode, but only if all shutdown procedures are complete
@@ -552,6 +544,7 @@ void Engine::checkShutdown() {
 			}
 		}
 	}
+*/
 #endif /* EFI_MAIN_RELAY_CONTROL */
 }
 
@@ -563,7 +556,8 @@ bool Engine::isInMainRelayBench() {
 }
 
 bool Engine::isInShutdownMode() const {
-#if EFI_MAIN_RELAY_CONTROL && EFI_PROD_CODE
+	// TODO: this logic is currently broken
+#if 0 && EFI_MAIN_RELAY_CONTROL && EFI_PROD_CODE
 	// if we are in "ignition_on" mode and not in shutdown mode
 	if (stopEngineRequestTimeNt == 0 && ignitionOnTimeNt > 0) {
 		const float vBattThresholdOff = 5.0f;
@@ -661,7 +655,7 @@ void Engine::periodicFastCallback() {
 
 void doScheduleStopEngine() {
 	efiPrintf("Starting doScheduleStopEngine");
-	engine->stopEngineRequestTimeNt = getTimeNowNt();
+	engine->limpManager.stopEngine();
 	engine->ignitionOnTimeNt = 0;
 	// todo: initiate stepper motor parking
 	// make sure we have stored all the info

firmware/controllers/algo/engine.h

@@ -274,7 +274,6 @@ public:
 	scheduling_s tdcScheduler[2];
 #endif /* EFI_ENGINE_CONTROL */
 
-	bool needToStopEngine(efitick_t nowNt) const;
 	bool etbAutoTune = false;
 	/**
 	 * this is based on isEngineChartEnabled and engineSnifferRpmThreshold settings
@@ -298,12 +297,6 @@ public:
 
 	RpmCalculator rpmCalculator;
 
-	/**
-	 * this is about 'stopengine' command
-	 */
-	efitick_t stopEngineRequestTimeNt = 0;
-
-
 	bool startStopState = false;
 	int startStopStateToggleCounter = 0;
 

firmware/controllers/core/fsio_core.h

@@ -47,7 +47,6 @@ typedef enum {
 	LE_METHOD_EXHAUST_VVT = 118,
 	LE_METHOD_IS_COOLANT_BROKEN = 119,
 	LE_METHOD_CRANKING_RPM = 120,
-	LE_METHOD_IN_SHUTDOWN = 122,
 	LE_METHOD_FSIO_DIGITAL_INPUT = 123,
 	LE_METHOD_FSIO_SETTING = 124,
 	LE_METHOD_PPS = 125,

firmware/controllers/core/fsio_impl.cpp

@@ -61,7 +61,6 @@ static LENameOrdinalPair leFsioDigitalInput(LE_METHOD_FSIO_DIGITAL_INPUT, FSIO_M
 static LENameOrdinalPair leIntakeVVT(LE_METHOD_INTAKE_VVT, "ivvt");
 static LENameOrdinalPair leExhaustVVT(LE_METHOD_EXHAUST_VVT, "evvt");
 static LENameOrdinalPair leCrankingRpm(LE_METHOD_CRANKING_RPM, "cranking_rpm");
-static LENameOrdinalPair leInShutdown(LE_METHOD_IN_SHUTDOWN, "in_shutdown");
 static LENameOrdinalPair leFuelRate(LE_METHOD_FUEL_FLOW_RATE, "fuel_flow");
 
 #define SYS_ELEMENT_POOL_SIZE 24
@@ -100,8 +99,6 @@ FsioResult getEngineValue(le_action_e action) {
 #endif
 	case LE_METHOD_CRANKING_RPM:
 		return engineConfiguration->cranking.rpm;
-	case LE_METHOD_IN_SHUTDOWN:
-		return engine->isInShutdownMode();
 	case LE_METHOD_VBATT:
 		return Sensor::getOrZero(SensorType::BatteryVoltage);
 	case LE_METHOD_TPS:
@@ -132,8 +129,6 @@ static const char * action2String(le_action_e action) {
 			return "CLT";
 		case LE_METHOD_FAN:
 			return "fan";
-		case LE_METHOD_IN_SHUTDOWN:
-			return leInShutdown.name;
 
 		default: {
 			// this is here to make compiler happy

firmware/controllers/engine_cycle/rpm_calculator.cpp

@@ -88,6 +88,10 @@ bool RpmCalculator::isRunning() const {
  * @return true if engine is spinning (cranking or running)
  */
 bool RpmCalculator::checkIfSpinning(efitick_t nowNt) const {
+	if (engine->limpManager.isEngineStop(nowNt)) {
+		return false;
+	}
+
 	// Anything below 60 rpm is not running
 	bool noRpmEventsForTooLong = lastTdcTimer.getElapsedSeconds(nowNt) > NO_RPM_EVENTS_TIMEOUT_SECS;
 

firmware/controllers/limp_manager.cpp

@@ -60,7 +60,8 @@ void LimpManager::updateState(int rpm, efitick_t nowNt) {
 		m_hadOilPressureAfterStart = false;
 	}
 
-	if (engine->needToStopEngine(nowNt)) {
+	// If we're in engine stop mode, inhibit fuel
+	if (isEngineStop(nowNt)) {
 		/**
 		 * todo: we need explicit clarification on why do we cut fuel but do not cut spark here!
 		 */
@@ -75,6 +76,7 @@ todo AndreiKA this change breaks 22 unit tests?
 */
 	}
 
+
 	m_transientAllowInjection = allowFuel;
 	m_transientAllowIgnition = allowSpark;
 }
@@ -93,6 +95,21 @@ void LimpManager::fatalError() {
 	setFaultRevLimit(0);
 }
 
+void LimpManager::stopEngine() {
+	m_engineStopTimer.reset();
+}
+
+bool LimpManager::isEngineStop(efitick_t nowNt) const {
+	float timeSinceStop = getTimeSinceEngineStop(nowNt);
+
+	// If there was stop requested in the past 5 seconds, we're in stop mode
+	return timeSinceStop < 5;
+}
+
+float LimpManager::getTimeSinceEngineStop(efitick_t nowNt) const {
+	return m_engineStopTimer.getElapsedSeconds(nowNt);
+}
+
 void LimpManager::setFaultRevLimit(int limit) {
 	// Only allow decreasing the limit
 	// aka uses the limit of the worst fault to yet occur

firmware/controllers/limp_manager.h

@@ -66,6 +66,10 @@ public:
 	// Other subsystems call these APIs to indicate a problem has occured
 	void etbProblem();
 	void fatalError();
+	void stopEngine();
+
+	bool isEngineStop(efitick_t nowNt) const;
+	float getTimeSinceEngineStop(efitick_t nowNt) const;
 
 private:
 	void setFaultRevLimit(int limit);
@@ -82,4 +86,6 @@ private:
 	Clearable m_transientAllowIgnition = true;
 
 	bool m_hadOilPressureAfterStart = false;
+
+	Timer m_engineStopTimer;
 };

firmware/controllers/settings.cpp

@@ -839,8 +839,7 @@ static void disableSpi(int index) {
 }
 
 /**
- * See 'Engine::needToStopEngine' for code which actually stops engine
- * weird: we stop pins from here? we probably should stop engine from the code which is actually stopping engine?
+ * See 'LimpManager::isEngineStop' for code which actually stops engine
  */
 void scheduleStopEngine(void) {
 	doScheduleStopEngine();