#include <M5Stack.h>

float  XA_SIG = 0, XB_SIG = 1,  YA_SIG = 0, YB_SIG = 1;
volatile float pulsesX, pulsesY;
void setup() {
  M5.begin();

  pinMode(22, INPUT_PULLUP); // internal pullup input pin
  pinMode(21, INPUT_PULLUP); // internalเป็น pullup input pin

  attachInterrupt(22, XA_RISE, RISING); // Pin 2 stack 22?
  attachInterrupt(21, XB_RISE, RISING); // Pin 3 stack 21?

  Serial.begin(115200);
  delay(100);
  Serial.println("Connected");
}//setup


void loop() {
  Serial.print("x");
  Serial.print(pulsesX);
  Serial.println("end");
  delay(20);
}

//X-Axis

void XA_RISE() {
  detachInterrupt(22);
  //delay(1);
  XA_SIG = 1;

  if (XB_SIG == 0) {

    pulsesX++;//moving forward
  }
  if (XB_SIG == 1) {
    pulsesX--;//moving reverse
  }
  attachInterrupt(22, XA_FALL, FALLING);
}

void XA_FALL() {
  detachInterrupt(22);
  //delay(1);
  XA_SIG = 0;

  if (XB_SIG == 1) {
    pulsesX++;//moving forward
  }
  if (XB_SIG == 0) {
    pulsesX--;//moving reverse
  }
  attachInterrupt(22, XA_RISE, RISING);
}

void XB_RISE() {
  detachInterrupt(21);
  //delay(1);
  XB_SIG = 1;

  if (XA_SIG == 1) {
    pulsesX++;//moving forward
  }
  if (XA_SIG == 0) {
    pulsesX--;//moving reverse
  }
  attachInterrupt(21, XB_FALL, FALLING);
}

void XB_FALL() {
  detachInterrupt(21);
  //delay(1);
  XB_SIG = 0;

  if (XA_SIG == 0) {
    pulsesX++;//moving forwar
  }
  if (XA_SIG == 1) {
    pulsesX--;//moving reverse
  }
  attachInterrupt(21, XB_RISE, RISING);
}

but, when I touch the encoder I have no readings on serial monitor..

x0.00end
x0.00end
x0.00end
x0.00end
x0.00end
x0.00end
x0.00end
x0.00end
x0.00end
x0.00end
x0.00end
x0.00end
x0.00end
x0.00end
x0.00end
x0.00end
x0.00end
x0.00end
x0.00end
x0.00end
x0.00end
x0.00end
x0.00end
x0.00end

whats wrong??

maybe something about IRAM_ATTR ISR() ??

tnks