mirror of https://github.com/rusefi/rusefi.git
78 lines
1.9 KiB
C++
78 lines
1.9 KiB
C++
/**
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* @file boards/hellen/hellen_board_id.h
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* @brief Board-Id detector for Hellen boards
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*
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* @author andreika <prometheus.pcb@gmail.com>
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* @author Andrey Belomutskiy, (c) 2012-2022
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*/
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#pragma once
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// this is used by the detection method and should be visible to the interrupt handler (hellenBoardIdInputCallback)
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class HellenBoardIdFinderState
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{
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public:
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efitick_t timeChargeNt = 0;
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ioportid_t rOutputPinPort;
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int rOutputPinIdx;
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ioportid_t rInputPinPort;
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int rInputPinIdx;
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#if EFI_PROD_CODE
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semaphore_t boardId_wake;
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#endif /* EFI_PROD_CODE */
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};
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// We need to solve the following equation for R or C:
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// X^Td - X^(Tc1+Td) + X^(Tc2-Tc1) - 1 = 0
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// where: X = exp(-1/(RC))
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class HellenBoardIdSolver
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{
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public:
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float fx(float x) {
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return exp(k1 / x) - exp(k2 / x) + exp(k3 / x) - 1.0;
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}
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// first-order derivative
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float dfx(float x) {
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return (-1.0f / (x * x)) * (k1 * exp(k1 / x) - k2 * exp(k2 / x) + k3 * exp(k3 / x));
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}
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// Newton numerical method (x is R and y is C, or vice-versa)
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float solve(float Tc1, float Tc2, float x0, float y, float deltaX);
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private:
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// exponential function coefs (see solve())
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float k1, k2, k3;
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};
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class HellenBoardIdFinderBase
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{
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public:
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float calc(float Tc1_us, float Tc2_us, float Rest, float C, bool testOnlyMajorSeries, float *Rmeasured, float *Cest, int *rIdx);
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float findClosestResistor(float R, bool testOnlyMajorSeries, int *rIdx);
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float calcEstimatedResistance(float Tc1_us, float C);
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public:
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HellenBoardIdFinderState state;
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};
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template <size_t NumPins>
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class HellenBoardIdFinder : public HellenBoardIdFinderBase
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{
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public:
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HellenBoardIdFinder(brain_pin_e (&rP)[NumPins]) : rPins(rP) {}
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// R1 or R2
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bool measureChargingTimes(int i, float & Tc1_us, float & Tc2_us);
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bool measureChargingTimesAveraged(int i, float & Tc1_us, float & Tc2_us);
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public:
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brain_pin_e (&rPins)[NumPins];
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HellenBoardIdFinderState state;
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};
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