Change interrupt handler technique to not rely on function pointer and instead use user-facing macros

uart.hpp

@@ -5,9 +5,7 @@
 #include "config.hpp"
 #include "software.hpp"
 
-#undef UART0_INT_VECTORS
 #include "hardware0.hpp"
-#undef UART1_INT_VECTORS
 #include "hardware1.hpp"
 
 #include "../flash/flash.hpp"
@@ -356,6 +354,25 @@ class Uart {
 	{
 		static_assert(type::always_false_v<Ts...>, "Not implemented");
 	}
+
+  private:
+	friend void ::USART0_RX_vect();
+	friend void ::USART0_UDRE_vect();
+
+#ifdef HAS_UART1
+	friend void ::USART1_RX_vect();
+	friend void ::USART1_UDRE_vect();
+#endif
+
+	static void rxIntHandler() FORCE_INLINE
+	{
+		Driver::rxIntHandler();
+	}
+
+	static void dataRegEmptyIntHandler() FORCE_INLINE
+	{
+		Driver::dataRegEmptyIntHandler();
+	}
 };
 
 template <typename cfg = Config<>>