| Line | Branch | Decision | Exec | Source |
|---|---|---|---|---|
| 1 | /* | |||
| 2 | * @file tachometer.cpp | |||
| 3 | * @brief This is about driving external analog tachometers | |||
| 4 | * | |||
| 5 | * This implementation produces one pulse per engine cycle | |||
| 6 | * | |||
| 7 | * @date Aug 18, 2015 | |||
| 8 | * @author Andrey Belomutskiy, (c) 2012-2020 | |||
| 9 | */ | |||
| 10 | ||||
| 11 | #include "pch.h" | |||
| 12 | ||||
| 13 | #include "tachometer.h" | |||
| 14 | ||||
| 15 | static SimplePwm tachControl("tach"); | |||
| 16 | static float tachFreq; | |||
| 17 | static float duty; | |||
| 18 | ||||
| 19 | #if EFI_UNIT_TEST | |||
| 20 | 1 | float getTachFreq() { | ||
| 21 | 1 | return tachFreq; | ||
| 22 | } | |||
| 23 | ||||
| 24 | 1 | float getTachDuty() { | ||
| 25 | 1 | return duty; | ||
| 26 | } | |||
| 27 | #endif | |||
| 28 | ||||
| 29 | ||||
| 30 | 1120 | void TachometerModule::onFastCallback() { | ||
| 31 | // Only do anything if tach enabled | |||
| 32 |
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1120 | if (!tachHasInit) { |
| 33 | 1117 | return; | ||
| 34 | } | |||
| 35 | ||||
| 36 | // How many tach pulse periods do we have? | |||
| 37 | 3 | float periods = engineConfiguration->tachPulsePerRev; | ||
| 38 | ||||
| 39 |
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3 | if (periods == 0 || periods > 10) { |
| 40 | ✗ | firmwareError(ObdCode::CUSTOM_ERR_6709, "Invalid tachometer pulse per rev: %.2f", periods); | ||
| 41 | ✗ | tachHasInit = false; // disable until nex fw init to avoid spamming the output | ||
| 42 | ✗ | return; | ||
| 43 | } | |||
| 44 | ||||
| 45 | // What is the angle per tach output period? | |||
| 46 | 3 | float cycleTimeMs = 60000.0f / Sensor::getOrZero(SensorType::Rpm); | ||
| 47 | 3 | float periodTimeMs = cycleTimeMs / periods; | ||
| 48 | 3 | tachFreq = 1000.0f / periodTimeMs; | ||
| 49 | ||||
| 50 |
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3 | if (engineConfiguration->tachPulseDurationAsDutyCycle) { |
| 51 | // Simple case - duty explicitly set | |||
| 52 | 3 | duty = engineConfiguration->tachPulseDuractionMs; | ||
| 53 | } else { | |||
| 54 | // Constant high-time mode - compute the correct duty cycle | |||
| 55 | ✗ | duty = engineConfiguration->tachPulseDuractionMs / periodTimeMs; | ||
| 56 | } | |||
| 57 | ||||
| 58 | // In case Freq is under 1Hz, we stop pwm to avoid warnings! | |||
| 59 |
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3 | if (tachFreq < 1) { |
| 60 | ✗ | tachFreq = NAN; | ||
| 61 | } | |||
| 62 | ||||
| 63 | 3 | tachControl.setSimplePwmDutyCycle(duty); | ||
| 64 | 3 | tachControl.setFrequency(tachFreq); | ||
| 65 | } | |||
| 66 | ||||
| 67 | 584 | void TachometerModule::init(){ | ||
| 68 | 584 | tachHasInit = false; | ||
| 69 | ||||
| 70 |
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584 | if (!isBrainPinValid(engineConfiguration->tachOutputPin)) { |
| 71 | 583 | return; | ||
| 72 | } | |||
| 73 | ||||
| 74 | 1 | startSimplePwm(&tachControl, | ||
| 75 | "Tachometer", | |||
| 76 | &engine->scheduler, | |||
| 77 | &enginePins.tachOut, | |||
| 78 | NAN, 0.1f); | |||
| 79 | ||||
| 80 | 1 | tachHasInit = true; | ||
| 81 | } | |||
| 82 |