Begin functionality for EXTI callbacks

CMakeLists.txt

@@ -34,6 +34,7 @@ set(PROJECT_INCLUDE_DIRECTORIES
         SHAL/Include/Peripheral/Timer/Reg
         SHAL/Include/Peripheral/GPIO
         SHAL/Include/Peripheral/GPIO/Reg
+        SHAL/Include/Peripheral/EXT/
         ${CMAKE_CURRENT_SOURCE_DIR}/SHAL/Include
 )
 

SHAL/Include/Peripheral/EXT/SHAL_EXTI_CALLBACK.h

@@ -0,0 +1,41 @@
+/**
+  ******************************************************************************
+  * @file    SHAL_TIM.h
+  * @author  Luca Lizaranzu
+  * @brief   Callbacks for external interrupts
+  ******************************************************************************
+  */
+
+#ifndef SHMINGO_HAL_SHAL_EXTI_CALLBACK_H
+#define SHMINGO_HAL_SHAL_EXTI_CALLBACK_H
+
+#include "SHAL_CORE.h"
+#include "SHAL_GPIO_REG_F072xB.h"
+
+#define DEFINE_EXTI_IRQ(EXTI_Channel)                           \
+extern "C" void EXTI##EXTI_Channel##_IRQHandler(void) {         \
+    if (EXTI->PR & (1 << EXTI_Channel)) {                   \
+        EXTI->PR |= (1 << EXTI_Channel); /*clear flag */    \
+        auto cb = EXTI_callbacks[EXTI_Channel];                 \
+        if (cb) cb();                                           \
+    };                                                          \
+};
+
+#define DEFINE_MULTI_EXTI_IRQ(EXTI_Channel_Min, EXTI_Channel_Max)                   \
+extern "C" void EXTI##EXTI_Channel_Max##_##EXTI_Channel_Min##_IRQHandler(void) {    \
+    for(uint8_t line = EXTI_Channel_Min; line <= EXTI_Channel_Max; line++){         \
+        if (EXTI->PR & (1 << line)) {                                   \
+            EXTI->PR |= (1 << line); /*clear flag */                    \
+            auto cb = EXTI_callbacks[line];                                 \
+            if (cb) cb();                                                           \
+        };                                                                          \
+    }                                                                               \
+};
+
+typedef void (*EXTICallback)(); //Typedef for callback function
+
+[[maybe_unused]] static EXTICallback EXTI_callbacks[NUM_EXTI_LINES] = {nullptr}; //Timer IRQ Callback table
+
+void registerEXTICallback(GPIO_Key key, EXTICallback callback);
+
+#endif //SHMINGO_HAL_SHAL_EXTI_CALLBACK_H

SHAL/Include/Peripheral/GPIO/Reg/SHAL_GPIO_REG_F072xB.h

@@ -12,6 +12,7 @@
 
 #define AVAILABLE_PORTS 3
 #define PINS_PER_PORT 16
+#define NUM_EXTI_LINES 16
 
 #define AVAILABLE_GPIO \
     X(A0) X(A1) X(A2) X(A3) X(A4) X(A5) X(A6) X(A7) X(A8) X(A9) X(A10) X(A11) X(A12) X(A13) X(A14) X(A15) \

SHAL/Include/Peripheral/GPIO/SHAL_GPIO.h

@@ -9,6 +9,9 @@
 
 #include <cassert>
 #include "SHAL_GPIO_REG_F072xB.h"
+#include "SHAL_EXTI_CALLBACK.h"
+
+
 
 enum class PinMode : uint8_t{
     INPUT_MODE,
@@ -17,9 +20,21 @@ enum class PinMode : uint8_t{
     ANALOG_MODE,
     INVALID
 };
-
 unsigned long getPinMode(PinMode mode);
 
+enum class TriggerMode : uint8_t{
+    RISING_EDGE,
+    FALLING_EDGE,
+    RISING_FALLING_EDGE
+};
+
+unsigned long getTriggerMode(TriggerMode mode);
+
+
+
+
+
+
 //Abstraction of GPIO registers
 class GPIO{
 
@@ -42,15 +57,21 @@ private:
 
 };
 
-
+//Init GPIO for normal use
 #define initGPIO(GPIO_KEY, PIN_MODE) GPIOManager::get(GPIO_KEY, PIN_MODE)
 
+//Init GPIO for use as an external interrupt
+#define useGPIOAsInterrupt(GPIO_KEY, Trigger_Mode, Callback) GPIOManager::getInterruptGPIO(GPIO_KEY, Trigger_Mode, Callback)
+
 //Manages instances of GPIO objects
 class GPIOManager{
 
 public:
 
     static GPIO& get(GPIO_Key, PinMode pinMode);
+
+    static void getInterruptGPIO(GPIO_Key key, TriggerMode mode, EXTICallback callback);
+
     GPIOManager() = delete;
 
 private:
@@ -59,4 +80,5 @@ inline static GPIO m_gpios[AVAILABLE_PORTS][PINS_PER_PORT] = {{}};
 
 };
 
+
 #endif //SHMINGO_HAL_SHAL_GPIO_H

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
+