Basic support for GPIOs 0-15.

Start new 'core' component for low-level parts

Progress towards #8

core/include/common_macros.h

@@ -0,0 +1,33 @@
+/* Some common compiler macros
+ *
+ * Not esp8266-specific.
+ *
+ * Part of esp-open-rtos
+ * Copyright (C) 2015 Superhouse Automation Pty Ltd
+ * BSD Licensed as described in the file LICENSE
+ */
+
+#ifndef _COMMON_MACROS_H
+#define _COMMON_MACROS_H
+
+#define UNUSED __attributed((unused))
+
+#ifndef BIT
+#define BIT(X) (1<<X)
+#endif
+
+/* Use this macro to store constant values in IROM flash instead
+   of having them loaded into rodata (which resides in DRAM)
+
+   Unlike the ESP8266 SDK you don't need an attribute like this for
+   standard functions. They're stored in flash by default. But
+   variables need them.
+
+   Important to note: IROM flash can only be accessed via 32-bit word
+   aligned reads. It's up to the user of this attribute to ensure this.
+*/
+#define IROM __attribute__((section(".irom0"))) const
+
+#define INLINED inline static __attribute__((always_inline)) __attribute__((unused))
+
+#endif