speedometer.cpp

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#include "pch.h"
 
/**
 * GMT800 platform (1999–2007 classic Chevrolet Silverado/GMC Sierra, Tahoe, Yukon, etc.)
 * 4000 pulses per mile
 * 2485 pulses per kilometer
 */
 
#include "speedometer.h"
 
static SimplePwm speedoPwm("speedo");
 
static bool hasSpeedoInit = false;
 
void speedoUpdate() {
    if (!hasSpeedoInit) {
        return;
    }
 
    float kph = Sensor::getOrZero(SensorType::VehicleSpeed);
    float kps = kph * (1. / 3600);
    float freq = kps * engineConfiguration->speedometerPulsePerKm;
 
    if (freq < 1) {
        freq = NAN;
    }
 
    speedoPwm.setFrequency(freq);
}
 
void initSpeedometer() {
    hasSpeedoInit = false;
 
    if (!isBrainPinValid(engineConfiguration->speedometerOutputPin)) {
        return;
    }
 
    startSimplePwm(&speedoPwm,
                    "Speedometer",
                    &engine->scheduler,
                    &enginePins.speedoOut,
                    NAN, 0.5f);
 
    hasSpeedoInit = true;
}