Update the PIC32 port to use xTaskIncrementTick() and change the macro used to detect if XC is being used.

FreeRTOS/Source/portable/MPLAB/PIC32MX/port.c

@@ -76,7 +76,7 @@
  * Implementation of functions defined in portable.h for the PIC32MX port.
   *----------------------------------------------------------*/
 
-#ifndef __XC__
+#ifndef __XC
     #error This port is designed to work with XC32.  Please update your C compiler version.
 #endif
 
@@ -245,14 +245,14 @@ void vPortIncrementTick( void )
 unsigned portBASE_TYPE uxSavedStatus;
 
 	uxSavedStatus = uxPortSetInterruptMaskFromISR();
-	vTaskIncrementTick();
-	vPortClearInterruptMaskFromISR( uxSavedStatus );
-
-	/* If we are using the preemptive scheduler then we might want to select
-	a different task to execute. */
-	#if configUSE_PREEMPTION == 1
+	{
+		if( xTaskIncrementTick() != pdFALSE )
+		{
+			/* Pend a context switch. */
 			_CP0_BIS_CAUSE( portCORE_SW_0 );
-	#endif /* configUSE_PREEMPTION */
+		}
+	}
+	vPortClearInterruptMaskFromISR( uxSavedStatus );
 
 	/* Clear timer 1 interrupt. */
 	IFS0CLR = _IFS0_T1IF_MASK;

FreeRTOS/Source/portable/MPLAB/PIC32MX/port_asm.S

@@ -131,9 +131,9 @@ vPortStartFirstTask:
 
 vPortYieldISR:
 
-	/* Make room for the context. First save the current status so we can
-	manipulate it, and the cause and EPC registers so we capture their
-	original values in case of interrupt nesting. */
+	/* Make room for the context. First save the current status so it can be
+	manipulated, and the cause and EPC registers so thier original values are
+	captured. */
 	mfc0		k0, _CP0_CAUSE
 	addiu		sp,	sp, -portCONTEXT_SIZE
 	mfc0		k1, _CP0_STATUS
@@ -145,7 +145,7 @@ vPortYieldISR:
 	sw			s5, 40(sp)
 	sw			k1, portSTATUS_STACK_LOCATION(sp)
 
-	/* Enable interrupts above the current priority. */
+	/* Interrupts above the kernel priority are going to be re-enabled. */
 	srl			k0, k0, 0xa
 	ins 		k1, k0, 10, 6
 	ins			k1, zero, 1, 4