4.0" ST7796S tft irq is triggered continuously using esp32

[wolfrose]

Hi,

I'm trying to design a tft interrupt code using esp32.

The code is working fine in polling code.
When using interrupt, the main function is triggered continuously without touching the tft module.

I checked the signal at the irq pin of the tft and the signal seems to be triggered in a way it's like a spi signal which isn't actually.

Without enabling interrupt, the tft irq works as expected.

This is my code:

1. main:

#include <SPI.h>
#include <TFT_eSPI.h>
#include <PNGdec.h>
#include "system_variables.h"

void IRAM_ATTR tft_irq_isr(void);

TFT_eSPI tft = TFT_eSPI();

void setup(void) {
  Serial.begin(115200);
  Serial.println("\n\nStarting...");
  delay(100);

  tft.init();
  tft.setRotation(0);
  attachInterrupt(36, tft_irq_isr, FALLING);
  main_menu();
}

void loop() {
}

2. isr code:

void read_menu_buttons(void){
  if(main_index == MAIN_MENU){
    main_index |= read_button(f1);
    main_index |= read_button(f2);
  }
  else if(main_index == FUNCTION1){
    main_index |= read_button(f1b1);
    main_index |= read_button(f1b2);
    main_index |= read_button(main_menu_b);   
  }
  else if(main_index == FUNCTION2){
    main_index |= read_button(f2b1);
    main_index |= read_button(f2b2);
    main_index |= read_button(main_menu_b);    
  }
}

void IRAM_ATTR tft_irq_isr(void) {
    detachInterrupt(tft_irq.tft_irq_pin);

    read_menu_buttons();
    
    switch(main_index){
      
      case MAIN_MENU:
        main_menu();
      break;
  
      case FUNCTION1:
        function1();
      break;
  
      case FUNCTION2:
        function2();
      break;
      

    }

  attachInterrupt(tft_irq.tft_irq_pin, tft_irq_isr, FALLING);
}

[wolfrose]

OK, one note until now is that I have to remove any function like, read_menu_buttons(); which is using SPI interrupt which is using another interrupt vectoring inside the current interrupt.