trigger_input_adc.h

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/**
 * @file    trigger_input_adc.h
 * @brief   Position sensor hardware layer, Using ADC and software comparator
 *
 * @date Jan 27, 2020
 * @author andreika <prometheus.pcb@gmail.com>
 * @author Andrey Belomutskiy, (c) 2012-2020
 */
 
#pragma once
#include "global.h"
#include "trigger_input.h"
#include "adc_inputs.h"
 
class TriggerAdcDetector {
public:
    void init();
    void reset();
 
    void digitalCallback(efitick_t stamp, bool isPrimary, bool rise);
    void analogCallback(efitick_t stamp, triggerAdcSample_t value);
 
    void setWeakSignal(bool isWeak);
 
public:
    triggerAdcSample_t adcDefaultThreshold{};
    triggerAdcSample_t adcMinThreshold{};
    triggerAdcSample_t adcMaxThreshold{};
 
    float triggerInputDividerCoefficient{};
 
    float triggerAdcITermCoef = 1600.0f;
    float triggerAdcITermMin = 3.125e-8f;   // corresponds to rpm=25
 
    int transitionCooldown = 5;
 
    int analogToDigitalTransitionCnt{};
    int digitalToAnalogTransitionCnt{};
 
    triggerAdcMode_t curAdcMode = TRIGGER_ADC_NONE;
    float adcThreshold = adcDefaultThreshold;
    float triggerAdcITerm = triggerAdcITermMin;
 
    // these thresholds allow to switch from ADC mode (low-rpm) to EXTI mode (fast-rpm), indicating the clamping of the signal
    triggerAdcSample_t switchingThresholdLow = 0, switchingThresholdHigh = 0;
    efidur_t minDeltaTimeForStableAdcDetectionNt = 0;
    efidur_t stampCorrectionForAdc = 0;
    int switchingCnt = 0, switchingTeethCnt = 0;
    int prevValue = 0;  // not set
    efitick_t prevStamp = 0;
 
    // we need to distinguish between weak and strong signals because of different SNR and thresholds.
    bool isSignalWeak = true;
    int zeroThreshold = 0;
 
    // the 'center' of the signal is variable, so we need to adjust the thresholds.
    int minDeltaThresholdWeakSignal = 0, minDeltaThresholdStrongSignal = 0;
 
    // this is the number of measurements while we store the counter before we reset to 'isSignalWeak'
    int minDeltaThresholdCntPos = 0, minDeltaThresholdCntNeg = 0;
    int integralSum = 0;
    int transitionCooldownCnt = 0;
 
    int modeSwitchCnt = 0;
};