diff --git a/README.md b/README.md
index 007daa7..9c913d9 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,7 @@ Note: this list will probably change with each functionality update.
                | `realtek-ambz` | `beken-72xx`
 --------------------|----------------|-------------
 Core functions      | ✔️             | ✔️
-GPIO/PWM/IRQ        | ✔️/✔️/✔️       | ❓/✔️/❌
+GPIO/PWM/IRQ        | ✔️/✔️/✔️       | ✔️/✔️/✔️
 Analog input (ADC)  | ✔️             | ✔️
 Serial              | ✔️             | ✔️
 Serial (extra)      | 0, 1, 2        | 1, 2
diff --git a/arduino/beken-72xx/cores/arduino/wiring_irq.c b/arduino/beken-72xx/cores/arduino/wiring_irq.c
new file mode 100644
index 0000000..8ccde62
--- /dev/null
+++ b/arduino/beken-72xx/cores/arduino/wiring_irq.c
@@ -0,0 +1,74 @@
+/* Copyright (c) Kuba Szczodrzyński 2022-07-31. */
+
+#include <Arduino.h>
+
+static void *irqHandlerList[PINS_COUNT] = {NULL};
+static void *irqHandlerArgs[PINS_COUNT] = {NULL};
+
+static void irqHandler(unsigned char gpio) {
+	int pin = -1;
+	for (pin_size_t i = 0; i < PINS_COUNT; i++) {
+		if (pinTable[i].gpio == gpio) {
+			pin = i;
+			break;
+		}
+	}
+	if (pin == -1)
+		return;
+	if (!irqHandlerList[pin])
+		return;
+	if (irqHandlerArgs[pin] == NULL) {
+		((voidFuncPtr)irqHandlerList[pin])();
+	} else {
+		((voidFuncPtrParam)irqHandlerList[pin])(irqHandlerArgs[pin]);
+	}
+}
+
+void attachInterrupt(pin_size_t interruptNumber, voidFuncPtr callback, PinStatus mode) {
+	attachInterruptParam(interruptNumber, (voidFuncPtrParam)callback, mode, NULL);
+}
+
+void attachInterruptParam(pin_size_t interruptNumber, voidFuncPtrParam callback, PinStatus mode, void *param) {
+	PinInfo *pin = pinInfo(interruptNumber);
+	if (!pin)
+		return;
+	if (!pinSupported(pin, PIN_IRQ))
+		return;
+	uint32_t event	= 0;
+	PinMode modeNew = 0;
+	switch (mode) {
+		case LOW:
+			event	= GPIO_INT_LEVEL_LOW;
+			modeNew = INPUT_PULLUP;
+			break;
+		case HIGH:
+			event	= GPIO_INT_LEVEL_HIGH;
+			modeNew = INPUT_PULLDOWN;
+			break;
+		case FALLING:
+			event	= GPIO_INT_LEVEL_FALLING;
+			modeNew = INPUT_PULLUP;
+			break;
+		case RISING:
+			event	= GPIO_INT_LEVEL_RISING;
+			modeNew = INPUT_PULLDOWN;
+			break;
+		default:
+			return;
+	}
+	irqHandlerList[interruptNumber] = callback;
+	irqHandlerArgs[interruptNumber] = param;
+	gpio_int_enable(pin->gpio, event, irqHandler);
+	pin->enabled |= PIN_IRQ | PIN_GPIO;
+	pin->mode = modeNew;
+}
+
+void detachInterrupt(pin_size_t interruptNumber) {
+	PinInfo *pin = pinInfo(interruptNumber);
+	if (!pin)
+		return;
+	if (!pinSupported(pin, PIN_IRQ))
+		return;
+	gpio_int_disable(pin->gpio);
+	pin->enabled &= ~PIN_IRQ;
+}
diff --git a/arduino/realtek-ambz/cores/arduino/WInterrupts.c b/arduino/realtek-ambz/cores/arduino/WInterrupts.c
index bbb5f40..90a6cf4 100644
--- a/arduino/realtek-ambz/cores/arduino/WInterrupts.c
+++ b/arduino/realtek-ambz/cores/arduino/WInterrupts.c
@@ -10,9 +10,9 @@ static void *gpio_irq_handler_args[PINS_COUNT] = {NULL};
 extern bool pinInvalid(pin_size_t pinNumber);
 extern void pinRemoveMode(pin_size_t pinNumber);
 
-void gpioIrqHandler(uint32_t id, gpio_irq_event event) {
+static void gpioIrqHandler(uint32_t id, gpio_irq_event event) {
 	if (gpio_irq_handler_list[id] != NULL) {
-		if (gpio_irq_handler_args[id] != NULL)
+		if (gpio_irq_handler_args[id] == NULL)
 			((voidFuncPtr)gpio_irq_handler_list[id])();
 		else
 			((voidFuncPtrParam)gpio_irq_handler_list[id])(gpio_irq_handler_args[id]);