ESP32 Interrupt Handler Not Registered

In this tutorial, you'll learn about ESP32 Interrupt Handler Not Registered. We cover key concepts, practical examples, and best practices.

The Problem

ESP32 interrupt ISR function is never called even when the event occurs.

Quick Fix

Wrong

gpio_isr_register(myISR, NULL, ESP_INTR_FLAG_LEVEL1, NULL);
// GPIO interrupt not enabled on pin

GPIO event occurs but ISR is never called.

Right

gpio_set_direction(4, GPIO_MODE_INPUT);
gpio_set_pull_mode(4, GPIO_PULLUP_ONLY);
gpio_set_intr_type(4, GPIO_INTR_NEGEDGE);
gpio_install_isr_service(ESP_INTR_FLAG_LEVEL1);
gpio_isr_handler_add(4, myISR, NULL);
// For legacy API:
// gpio_isr_register(myISR, NULL, ESP_INTR_FLAG_LEVEL1, NULL);

ISR fires on every falling edge at GPIO 4.

Prevention

Call gpio_install_isr_service() before gpio_isr_handler_add(). Set intr_type on the pin. Use gpio_isr_handler_add() for GPIO-specific ISR. Verify interrupt source is enabled in hardware.

DodaTech engineers apply these same patterns across Doda Browser, DodaZIP, and Durga Antivirus Pro for production IoT reliability.

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