mirror of https://github.com/rusefi/rusefi-1.git
96 lines
2.3 KiB
C++
96 lines
2.3 KiB
C++
/*
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* @file tachometer.cpp
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* @brief This is about driving external analog tachometers
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*
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* This implementation produces one pulse per engine cycle
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*
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* todo: these is a bit of duplication with dizzySparkOutputPin
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*
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* @date Aug 18, 2015
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* @author Andrey Belomutskiy, (c) 2012-2020
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*/
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#include "tachometer.h"
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#include "trigger_central.h"
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#include "pwm_generator_logic.h"
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EXTERN_ENGINE;
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static SimplePwm tachControl("tach");
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static float tachFreq;
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static float duty;
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#if EFI_UNIT_TEST
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float getTachFreq(void) {
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return tachFreq;
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}
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float getTachDuty(void) {
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return duty;
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}
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#endif
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static void tachSignalCallback(trigger_event_e ckpSignalType,
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uint32_t index, efitick_t edgeTimestamp DECLARE_ENGINE_PARAMETER_SUFFIX) {
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// only process at index configured to avoid too much cpu time for index 0?
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if (index != (uint32_t)CONFIG(tachPulseTriggerIndex)) {
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return;
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}
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#if EFI_UNIT_TEST
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printf("tachSignalCallback(%d %d)\n", ckpSignalType, index);
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printf("Current RPM: %d\n",GET_RPM());
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UNUSED(edgeTimestamp);
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#else
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UNUSED(ckpSignalType);
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UNUSED(edgeTimestamp);
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#endif
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// How many tach pulse periods do we have?
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int periods = CONFIG(tachPulsePerRev);
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if (periods == 0 || periods > 10){
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firmwareError(CUSTOM_ERR_6709, "Invalid tachometer pulse per rev: %d", periods);
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return;
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}
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// What is the angle per tach output period?
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float cycleTimeMs = 60000.0f / GET_RPM();
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float periodTimeMs = cycleTimeMs / periods;
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tachFreq = 1000.0f / periodTimeMs;
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if (CONFIG(tachPulseDurationAsDutyCycle)) {
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// Simple case - duty explicitly set
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duty = CONFIG(tachPulseDuractionMs);
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} else {
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// Constant high-time mode - compute the correct duty cycle
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duty = CONFIG(tachPulseDuractionMs) / periodTimeMs;
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}
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// In case Freq is under 1Hz, we stop pwm to avoid warnings!
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if (tachFreq < 1) {
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tachFreq = NAN;
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}
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tachControl.setSimplePwmDutyCycle(duty);
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tachControl.setFrequency(tachFreq);
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}
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void initTachometer(DECLARE_ENGINE_PARAMETER_SIGNATURE) {
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if (CONFIG(tachOutputPin) == GPIO_UNASSIGNED) {
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return;
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}
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startSimplePwmExt(&tachControl,
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"Tachometer",
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&engine->executor,
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CONFIG(tachOutputPin),
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&enginePins.tachOut,
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NAN, 0.1f);
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#if EFI_SHAFT_POSITION_INPUT
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addTriggerEventListener(tachSignalCallback, "tach", engine);
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#endif /* EFI_SHAFT_POSITION_INPUT */
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}
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