detecting two rising edges from camshaft signal

Projects General Guidance
14

Use micros() for timing.

volatile uint32_t risingMicros;
volatile uint32_t fallingMicros;
volatile bool fallDetected;
volatile bool riseDetected;
uint32_t timeBetweenPulses;
uint32_t pulseWidth;

void setup() {
  // Attach the two interrupts.
}

void loop() {
  // Deal with fallDetected and riseDetected here.
  if (riseDetected) {
    riseDetected = false;
    timeBetweenPulses = risingMicros - fallingMicros;
    if (timeBetweenPulses < pulseWidth * 2) {
      // Looks like we just got the second of the double pulse.
    }
  }
  if (fallDetected) {
    fallDetected = false;
    pulseWidth = fallingMicros - risingMicros;
  }
}

void risingISR() {
  risingMicros = micros();
  riseDetected = true;
}
  
void fallingISR() {
  fallingMicros = micros();
  fallDetected = true;
}