Changed the way the ARM7/9 GCC ports enter interrupts that can cause a context switch.

Source/portable/GCC/ARM7_LPC2000/portmacro.h

@@ -48,8 +48,12 @@
 	+ The assembler statements are now included in a single asm block rather
 	  than each line having its own asm block.
 
-	+ The macro portENTER_SWITCHING_ISR() no longer attempts to use the frame
-	  pointer.  Variables declared within ISRs must now be declared static.
+	Changes from V4.5.0
+
+	+ Removed the portENTER_SWITCHING_ISR() and portEXIT_SWITCHING_ISR() macros
+	  and replaced them with portYIELD_FROM_ISR() macro.  Application code 
+	  should now make use of the portSAVE_CONTEXT() and portRESTORE_CONTEXT()
+	  macros as per the V4.5.1 demo code.
 */
 
 #ifndef PORTMACRO_H
@@ -184,31 +188,8 @@ extern volatile unsigned portLONG ulCriticalNesting;					\
 }
 
 
-/*-----------------------------------------------------------
- * ISR entry and exit macros.  These are only required if a task switch
- * is required from the ISR.
- *----------------------------------------------------------*/
-
-
-#define portENTER_SWITCHING_ISR()										\
-	/* Save the context of the interrupted task. */						\
-	portSAVE_CONTEXT();													\
-	{
-
-#define portEXIT_SWITCHING_ISR( SwitchRequired )						\
-		/* If a switch is required then we just need to call */			\
-		/* vTaskSwitchContext() as the context has already been */		\
-		/* saved. */													\
-		if( SwitchRequired )											\
-		{																\
-			vTaskSwitchContext();										\
-		}																\
-	}																	\
-	/* Restore the context of which ever task is now the highest */		\
-	/* priority that is ready to run. */								\
-	portRESTORE_CONTEXT();
-
-#define portYIELD()					asm volatile ( "SWI" );	
+#define portYIELD_FROM_ISR()		vTaskSwitchContext()
+#define portYIELD()					asm volatile ( "SWI" )
 /*-----------------------------------------------------------*/