rpm_monitor.h

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#pragma once
 
#include <Arduino.h>
 
struct RpmMonitorConfig {
  uint8_t tachPin;              
  uint8_t pulsesPerRevolution;  
  uint32_t sampleWindowMs;      
};
 
constexpr RpmMonitorConfig kDefaultRpmMonitorConfig = {
    26,
    2,
    1000,
};
 
class RpmMonitor {
 public:
  explicit RpmMonitor(const RpmMonitorConfig& config = kDefaultRpmMonitorConfig);
 
  bool begin();
 
  void update(uint32_t nowMs);
 
  uint16_t rpm() const;
 
  uint32_t pulseCount() const;
 
  uint32_t sampleAgeMs(uint32_t nowMs) const;
 
 private:
  static void IRAM_ATTR handleInterrupt();
 
  void onPulse();
 
  uint32_t takePulseCountSnapshot();
 
  static RpmMonitor* activeInstance_;
 
  RpmMonitorConfig config_;
  volatile uint32_t pulseCountSinceSample_;
  uint16_t lastMeasuredRpm_;
  uint32_t lastSampleMs_;
  bool initialized_;
};