Compiler error: one_isr() causes a section type conflict with another_isr()

[titipc]

I have a project that needs to handle GPIO and time interruptions.
By compiling the code below I get:
exit status 1
void onTimer0() causes a section type conflict with void Button::isr()

Code: Untitled.cpp Select all

#define START_BUTTON 19 // gpio19    // Ligada ao botao start (iniciar ciclo)

#define STOP_BUTTON  23 // gpio23    // Ligada ao botal stop all 



#include <FunctionalInterrupt.h>

class Button

{

  public:

    Button(uint8_t reqPin) : PIN(reqPin) {

      pinMode(PIN, INPUT_PULLUP);

      attachInterrupt(PIN, std::bind(&Button::isr, this), FALLING);

    };

    ~Button() {

      detachInterrupt(PIN);

    }

    void IRAM_ATTR isr() {

      //numberKeyPresses += 1;

      pressed = true;

    }

    bool checkPressed() {

      bool lastPressed;

      lastPressed = this->pressed;

      this->pressed = false;

      return lastPressed;

    }

  private:

    const uint8_t PIN;

    //volatile uint32_t numberKeyPresses;

    volatile bool pressed;

    

};

Button start_button(START_BUTTON);

Button stop_button(STOP_BUTTON);



#define LedI            2      // Esp32 Pin Led

byte ledI_flash=0;             // Internal led flash control



hw_timer_t * timer0 = NULL;    // timer to flash



void IRAM_ATTR onTimer0(){

      if (ledI_flash) digitalWrite(LedI, digitalRead(LedI) ^ 1);   // toggle LED pin

}



void setup() {

  // Setup timer

    timer0 = timerBegin(0, 24000, true); //timerID 0, div 80

    timerAttachInterrupt(timer0, &onTimer0, true);

    timerAlarmWrite(timer0, 5000, true);   

    timerAlarmEnable(timer0); // enable timer  

  // start flashing

    ledI_flash=1;

}



void loop() {

  // put your main code here, to run repeatedly:

     if (start_button.checkPressed()) ledI_flash=1;

     if (stop_button.checkPressed()) ledI_flash=0;

}

If i remove IRAM_ATTR from one or both isr statements I succeed in compiling.

I'm using Arduino 1.8.9 and appreciate any help understanding the cause and solution.
Thanks,
Tiberio