Begin functionality for EXTI callbacks

SHAL/Src/Peripheral/GPIO/SHAL_GPIO.cpp

@@ -72,4 +72,21 @@ GPIO& GPIOManager::get(GPIO_Key key, PinMode pinMode) {
     }
 
     return m_gpios[gpioPort][gpioPin];
-}
+}
+
+void GPIOManager::getInterruptGPIO(GPIO_Key key, TriggerMode mode, EXTICallback callback) {
+    unsigned int gpioPort = getGPIOPortNumber(key);
+    unsigned long gpioPin = getGPIORegister(key).global_offset; //Use existing structs to get offset
+
+    if (m_gpios[gpioPort][gpioPin].m_GPIO_KEY == GPIO_Key::INVALID){
+        m_gpios[gpioPort][gpioPin] = GPIO(key,PinMode::INPUT_MODE); //Hardcode input mode for interrupt
+    }
+
+    RCC->APB2ENR |= RCC_APB2ENR_SYSCFGCOMPEN; //TODO check if this is different across STM32 models, enable EXT
+
+    SHAL_EXTIO_Register EXTILineEnable = getGPIOEXTICR(key);
+
+    *EXTILineEnable.EXT_ICR |= EXTILineEnable.mask; //Set bits to enable correct port on correct line
+
+
+}

SHAL/Src/Peripheral/SHAL_EXTI_CALLBACK.cpp

@@ -0,0 +1,35 @@
+//
+// Created by Luca on 9/3/2025.
+//
+
+#include "SHAL_EXTI_CALLBACK.h"
+
+#if defined(STM32F030x6)
+#elif defined(STM32F030x8)
+#elif defined(STM32F031x6)
+#elif defined(STM32F038xx)
+#elif defined(STM32F042x6)
+#elif defined(STM32F048xx)
+#elif defined(STM32F051x8)
+#elif defined(STM32F058xx)
+#elif defined(STM32F070x6)
+#elif defined(STM32F070xB)
+#elif defined(STM32F071xB)
+#elif defined(STM32F072xB)
+
+DEFINE_MULTI_EXTI_IRQ(0,1);
+DEFINE_MULTI_EXTI_IRQ(2,3);
+DEFINE_MULTI_EXTI_IRQ(4,15);
+
+#elif defined(STM32F078xx)
+#include "stm32f078xx.h"
+#elif defined(STM32F091xC)
+  #include "stm32f091xc.h"
+#elif defined(STM32F098xx)
+  #include "stm32f098xx.h"
+#elif defined(STM32F030xC)
+  #include "stm32f030xc.h"
+#else
+ #error "Please select first the target STM32F0xx device used in your application (in stm32f0xx.h file)"
+#endif
+