rusefi-1/firmware/hw_layer/cdm_ion_sense.cpp

/*
 * @file cdm_ion_sense.cpp
 *
 * Saab Ion Sensing Module integration
 *
 * See https://github.com/rusefi/rusefi/wiki/Saab_Trionic_8_Combustion-Detection-Module_on_Mazda_Miata_running_rusEfi
 *
 *  Created on: Dec 31, 2018
 * @author Andrey Belomutskiy, (c) 2012-2020
 */

#include "pch.h"

#include "cdm_ion_sense.h"

CdmState::CdmState() {
	accumilatingAtRevolution = 0;
	currentValue = 0;
	accumulatingCurrentValue = 0;
}

int CdmState::getValue(int currentRevolution) {
	applyAccumulatedData(currentRevolution);
	if (currentRevolution == currentValueAtIndex + 1) {
		// returning total result of previous engine cycle
		return currentValue;
	}
	// we are here if previous engine cycle had no knock events
	return 0;
}

void CdmState::applyAccumulatedData(int currentRevolution) {
	if (currentRevolution > accumilatingAtRevolution) {
		currentValue = accumulatingCurrentValue;
		currentValueAtIndex = accumilatingAtRevolution;
	}
}

void CdmState::onNewSignal(int currentRevolution) {
	if (this->accumilatingAtRevolution == currentRevolution) {
		accumulatingCurrentValue++;
	} else {
		applyAccumulatedData(currentRevolution);
		// start new accumulation
		accumilatingAtRevolution = currentRevolution;
		accumulatingCurrentValue = 1;
	}
}

// above logic compiles unconditionally so that unit tests are happy, but without an instance linker would have nothing to link
#if EFI_CDM_INTEGRATION

#include "digital_input_exti.h"

static CdmState instance;

int getCurrentCdmValue(int currentRevolution) {
	return instance.getValue(currentRevolution);
}

#if EFI_TUNER_STUDIO
void ionPostState(TunerStudioOutputChannels *tsOutputChannels) {
	tsOutputChannels->debugIntField1 = instance.totalCdmEvents;
}
#endif /* EFI_TUNER_STUDIO */

static void extIonCallback(void *arg) {
        UNUSED(arg);
        instance.totalCdmEvents++;

        int currentRevolution = engine->triggerCentral.triggerState.getTotalRevolutionCounter();
        instance.onNewSignal(currentRevolution);
}

void cdmIonInit(void) {
	if (!isBrainPinValid(engineConfiguration->cdmInputPin)) {
		return;
	}

	efiExtiEnablePin("ion", engineConfiguration->cdmInputPin, PAL_EVENT_MODE_RISING_EDGE, extIonCallback, NULL);
}

#endif /* EFI_CDM_INTEGRATION */