LCOV - code coverage report
Current view: top level - firmware/controllers/gauges - tachometer.cpp (source / functions) Hit Total Coverage
Test: coverage.info Lines: 23 27 85.2 %
Date: 2024-04-25 02:23:43 Functions: 4 4 100.0 %

          Line data    Source code
       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             : static bool tachHasInit = false;
      30             : 
      31         226 : void tachUpdate() {
      32             :         // Only do anything if tach enabled
      33         226 :         if (!tachHasInit) {
      34         223 :                 return;
      35             :         }
      36             : 
      37             :         // How many tach pulse periods do we have?
      38           3 :         int periods = engineConfiguration->tachPulsePerRev;
      39             : 
      40           3 :         if (periods == 0 || periods > 10) {
      41           0 :                 firmwareError(ObdCode::CUSTOM_ERR_6709, "Invalid tachometer pulse per rev: %d", periods);
      42           0 :                 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           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           0 :                 duty = engineConfiguration->tachPulseDuractionMs / periodTimeMs;
      56             :         }
      57             : 
      58             :         // In case Freq is under 1Hz, we stop pwm to avoid warnings!
      59           3 :         if (tachFreq < 1) {
      60           0 :                 tachFreq = NAN;
      61             :         }
      62             :         
      63           3 :         tachControl.setSimplePwmDutyCycle(duty);
      64           3 :         tachControl.setFrequency(tachFreq);
      65             : }
      66             : 
      67         306 : void initTachometer() {
      68         306 :         tachHasInit = false;
      69             : 
      70         306 :         if (!isBrainPinValid(engineConfiguration->tachOutputPin)) {
      71         305 :                 return;
      72             :         }
      73             : 
      74           1 :         startSimplePwm(&tachControl,
      75             :                                 "Tachometer",
      76             :                                 &engine->executor,
      77             :                                 &enginePins.tachOut,
      78             :                                 NAN, 0.1f);
      79             : 
      80           1 :         tachHasInit = true;
      81             : }

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