I want to know where can find "IRAM_ATTR void IRTimerInterruptHandler()" function

[smtmike]

Hi:

I need to modify ISR() content when interrupting inhibit another conflict problem.

I download IRremote ver:3.6.1 of lib.
Below content I clips form IRTimer.hpp

/*********************************************

• ESP32 boards - can use any pin for send PWM
  *********************************************/
  #elif defined(ESP32)

#2058 if !defined(SEND_AND_RECEIVE_TIMER_LEDC_CHANNEL)
#define SEND_AND_RECEIVE_TIMER_LEDC_CHANNEL 0 // The channel used for PWM 0 to 7 are high speed PWM channels
#2058 endif

#define TIMER_RESET_INTR_PENDING
#define TIMER_ENABLE_RECEIVE_INTR timerAlarmEnable(s50usTimer)
#define TIMER_DISABLE_RECEIVE_INTR if (s50usTimer != NULL) {timerEnd(s50usTimer); timerDetachInterrupt(s50usTimer);}
// Redefinition of ISR macro which creates a plain function now
#2058 ifdef ISR
#undef ISR
#2058 endif
#define ISR() IRAM_ATTR void IRTimerInterruptHandler()
IRAM_ATTR void IRTimerInterruptHandler(); <==== Where can find this function content

// Variables specific to the ESP32.
// the ledc functions behave like hardware timers for us :-), so we do not require our own soft PWM generation code.
hw_timer_t *s50usTimer;

/*

• Set timer for interrupts every MICROS_PER_TICK (50 us)
  */
  void timerConfigForReceive() {
  // ESP32 has a proper API to setup timers, no weird chip macros needed
  // simply call the readable API versions :)
  // 3 timers, choose 1, 80 divider for microsecond precision @80MHz clock, count_up = true
  s50usTimer = timerBegin(1, 80, true);
  timerAttachInterrupt(s50usTimer, &IRTimerInterruptHandler, 1);
  // every 50 us, autoreload = true
  timerAlarmWrite(s50usTimer, MICROS_PER_TICK, true);
  }

[NiKiZe]

When posting code, use code blocks to make it readable.
Also read the FAQ

[crankyoldgit]

I download IRremote ver:3.6.1 of lib.
Below content I clips form IRTimer.hpp

You're reporting an issue with & for a different library.
We can not help you.

IRremoteESP8266 v2.8.6 != IRremote 3.6.1 . We forked many years ago now. Completely different.