Fix doco

src/gos/gos_x_heap.h

@@ -5,38 +5,10 @@
  *              http://ugfx.org/license.html
  */
 
-/**
- * The raw32 GOS implementation supports any 32 bit processor with or without an
- * 	underlying operating system. It uses cooperative multi-tasking. Be careful
- * 	when writing device drivers not to disturb the assumptions this creates by performing
- * 	call-backs to uGFX code unless you define the INTERRUPTS_OFF() and INTERRUPTS_ON() macros.
- * 	It still requires some C runtime library support...
- * 		enough startup to initialise the stack, interrupts, static data etc and call main().
- * 		setjmp() and longjmp()			- for threading
- * 		memcpy()						- for heap and threading
- * 		malloc(), realloc and free()	- if GFX_OS_HEAP_SIZE == 0
- *
- * 	You must also define the following routines in your own code so that timing functions will work...
- * 		systemticks_t gfxSystemTicks(void);
- *		systemticks_t gfxMillisecondsToTicks(delaytime_t ms);
- */
 #ifndef _GOS_X_HEAP_H
 #define _GOS_X_HEAP_H
 
-#if GOS_NEED_X_HEAP
-
-
-/*===========================================================================*/
-/* Special Macros								                             */
-/*===========================================================================*/
-
-/**
- * @brief	Set the maximum size of the heap.
- * @note	If set to 0 then the C runtime library malloc() and free() are used.
- */
-#ifndef GFX_OS_HEAP_SIZE
-	#define GFX_OS_HEAP_SIZE	0
-#endif
+#if GOS_NEED_X_HEAP || defined(__DOXYGEN__)
 
 /*===========================================================================*/
 /* Type definitions                                                          */
@@ -46,7 +18,17 @@
 extern "C" {
 #endif
 
-	#if GFX_OS_HEAP_SIZE != 0
+	#if GFX_OS_HEAP_SIZE != 0 || defined(__DOXYGEN__)
+		/**
+		 * @brief	Take a chunk of memory and add it to the available heap
+		 * @note	Memory added must obviously not already be on the heap.
+		 * @note	It is allowable to add multiple non-contiguous blocks of memory
+		 * 			to the heap. If however it is contiguous with a previously added block
+		 * 			it will get merged with the existing block in order to allow
+		 * 			allocations that span the boundary.
+		 * @pre		GFX_OS_HEAP_SIZE != 0 and an operating system that uses the
+		 * 			internal ugfx heap allocator rather than its own allocator.
+		 */
 		void gfxAddHeapBlock(void *ptr, size_t sz);
 	#endif