Added CORE general include header discerning STM32 platform includes and containing global structs and defines

SHAL/Include/Peripheral/Timer/SHAL_TIM_CALLBACK.h

@@ -0,0 +1,31 @@
+/**
+  ******************************************************************************
+  * @file    SHAL.h
+  * @author  Luca Lizaranzu
+  * @brief   Utilities for creating and populating the timer IRQ callback table
+  * globally, see usage in SHAL_TIM.h. Created in use for singleton timer abstractions
+  ******************************************************************************
+  */
+
+#ifndef SHMINGO_HAL_SHAL_TIM_CALLBACK_H
+#define SHMINGO_HAL_SHAL_TIM_CALLBACK_H
+
+#include "SHAL/Include/Core/SHAL_CORE.h"
+
+#define DEFINE_TIMER_IRQ(key, irq_handler)                \
+extern "C" void irq_handler(void) {                       \
+    auto tim_reg = getTimerRegister(key);                 \
+    if (tim_reg->SR & TIM_SR_UIF) {                       \
+        tim_reg->SR &= ~TIM_SR_UIF; /* clear flag */      \
+        auto cb = timer_callbacks[static_cast<int>(key)]; \
+        if (cb) cb();                                     \
+    };                                                    \
+};
+
+typedef void (*TimerCallback)(); //Typedef for callback function
+
+[[maybe_unused]] static TimerCallback timer_callbacks[static_cast<int>(Timer_Key::NUM_TIMERS)] = {nullptr}; //Timer IRQ Callback table
+
+void registerTimerCallback(Timer_Key key, TimerCallback callback);
+
+#endif //SHMINGO_HAL_SHAL_TIM_CALLBACK_H