exti.h

#ifndef _exti_h_
#define _exti_h_

#include "types.h"
#include "system_clock.h"
#include "gpio.h"

#ifdef __cplusplus
extern "C"{
#endif // __cplusplus

extern int PWM_IN_EXTI_MAXPERIOD;
extern int PWM_IN_EXTI_MINPERIOD;
extern int PWM_IN_MAXPERIOD;
extern int PWM_IN_MINPERIOD;

extern const uint32_t extiLines[];
// This function is called by any of the interrupt handlers. It essentially fetches the user function pointer from the array and calls it.
#if defined(KODUINO_ISRS_INLINE)
static inline void wirishExternalInterruptHandler(uint8_t i) __attribute__((always_inline, unused));
#else
static inline void wirishExternalInterruptHandler(uint8_t i);
#endif
static inline void wirishExternalInterruptHandler(uint8_t i) {
  EXTI_ClearITPendingBit(extiLines[i]);
  // __disable_irq();
  EXTIChannel *S = &EXTI_MAP[i];
  // PWM_IN_EXTI pin?
  if (S->bPwmIn == 1) {
    
    // NEW
    volatile int currentMs = millis();
    volatile int currentSubMs = SysTick->LOAD - SysTick->VAL;
    volatile int delta = (currentMs - S->risingEdgeMs) * SysTick->LOAD + currentSubMs - S->risingEdgeSubMs;

    if (digitalRead(S->pinName)) {
      // This was a rising edge
      S->risingEdgeMs = currentMs;
      S->risingEdgeSubMs = currentSubMs;
      S->period = delta;
      if (delta > PWM_IN_EXTI_MAXPERIOD)
        S->period = delta - SysTick->LOAD;
      else if (delta < PWM_IN_EXTI_MINPERIOD)
        S->period = delta + SysTick->LOAD;
    } else {
      // This was a falling edge
      S->pulsewidth = delta;
    }
  } else {
    // ELSE fetch the user function pointer from the array
    ISRType handler = S->handler;
    //Check to see if the user handle is NULL
    if (handler != 0)
      handler();
  }
  // __enable_irq();
}

void attachInterruptWithPriority(uint8_t pinName, ISRType ISR, InterruptTrigger mode, uint8_t priority);

void attachInterrupt(uint8_t pinName, ISRType ISR, InterruptTrigger mode);

void detachInterrupt(uint8_t pinName);

void noInterrupts();

void interrupts();

 // end of addtogroup



// // PWM Input using EXTI
// float pwmIn(uint8_t pinName);

// // Private
// void pinModePwmIn(uint8_t pinName);
// void pwmInClkInit();
// uint32_t pwmInTicks();

#ifdef __cplusplus
} // extern "C"
#endif // __cplusplus

#endif