main_relay.cpp

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#include "pch.h"
 
#include "main_relay.h"
#include "ignition_controller.h"
 
void MainRelayController::onSlowCallback() {
    hasIgnitionVoltage = isIgnVoltage();
 
    if (hasIgnitionVoltage) {
        m_lastIgnitionTime.reset();
    }
 
#if EFI_MAIN_RELAY_CONTROL
    if (hasIgnitionVoltage) {
        delayedShutoffRequested = false;
    } else {
        // Query whether any engine modules want to keep the lights on
        delayedShutoffRequested = engine->engineModules.aggregate([](auto& m, bool prev) { return m.needsDelayedShutoff() | prev; }, false);
    }
    // TODO: delayed shutoff timeout?
 
    mainRelayState = hasIgnitionVoltage | delayedShutoffRequested;
#else // not EFI_MAIN_RELAY_CONTROL
    mainRelayState = true;
#endif
 
    enginePins.mainRelay.setValue("mr", mainRelayState);
}
 
bool MainRelayController::needsDelayedShutoff() {
    // Prevent main relay from turning off if we had ignition voltage in the past 1 second
    // This avoids accidentally killing the car during a transient, for example
    // right when the starter is engaged.
    return !m_lastIgnitionTime.hasElapsedSec(1);
}