Make the timer used for the PIC32 port layer user configurable.

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

@@ -83,6 +83,10 @@
 the first task is being restored. */
 #define portINITIAL_SR				( portIE_BIT | portEXL_BIT )
 
+#ifndef configTICK_INTERRUPT_VECTOR
+	#define configTICK_INTERRUPT_VECTOR _TIMER_1_VECTOR
+#endif
+
 /* Records the interrupt nesting depth.  This starts at one as it will be
 decremented to 0 when the first task starts. */
 volatile unsigned portBASE_TYPE uxInterruptNesting = 0x01;
@@ -101,9 +105,9 @@ const portSTACK_TYPE * const xISRStackTop = &( xISRStack[ configISR_STACK_SIZE -
  * Place the prototype here to ensure the interrupt vector is correctly installed. 
  * Note that because the interrupt is written in assembly, the IPL setting in the
  * following line of code has no effect.  The interrupt priority is set by the
- * call to ConfigIntTimer1() in prvSetupTimerInterrupt(). 
+ * call to ConfigIntTimer1() in vApplicationSetupTickTimerInterrupt(). 
  */
-extern void __attribute__( (interrupt(ipl1), vector(_TIMER_1_VECTOR))) vT1InterruptHandler( void );
+extern void __attribute__( (interrupt(ipl1), vector( configTICK_INTERRUPT_VECTOR ))) vPortTickInterruptHandler( void );
 
 /*
  * The software interrupt handler that performs the yield.  Note that, because
@@ -152,9 +156,15 @@ portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE
 /*-----------------------------------------------------------*/
 
 /*
- * Setup a timer for a regular tick.
+ * Setup a timer for a regular tick.  This function uses peripheral timer 1.
+ * The function is declared weak so an application writer can use a different
+ * timer by redefining this implementation.  If a different timer is used then
+ * configTICK_INTERRUPT_VECTOR must also be defined in FreeRTOSConfig.h to
+ * ensure the RTOS provided tick interrupt handler is installed on the correct
+ * vector number.  When Timer 1 is used the vector number is defined as 
+ * _TIMER_1_VECTOR.
  */
-void prvSetupTimerInterrupt( void )
+__attribute__(( weak )) void vApplicationSetupTickTimerInterrupt( void )
 {
 const unsigned long ulCompareMatch = ( (configPERIPHERAL_CLOCK_HZ / portTIMER_PRESCALE) / configTICK_RATE_HZ ) - 1;
 
@@ -182,7 +192,7 @@ extern void *pxCurrentTCB;
 
 	/* Setup the timer to generate the tick.  Interrupts will have been 
 	disabled by the time we get here. */
-	prvSetupTimerInterrupt();
+	vApplicationSetupTickTimerInterrupt();
 
 	/* Kick off the highest priority task that has been created so far. 
 	Its stack location is loaded into uxSavedTaskStackPointer. */

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

@@ -79,16 +79,16 @@
  	
  	.global vPortStartFirstTask
 	.global vPortYieldISR
-	.global vT1InterruptHandler
+	.global vPortTickInterruptHandler
 
 
 /******************************************************************/
 
  	.set		noreorder
 	.set 		noat
- 	.ent		vT1InterruptHandler
+ 	.ent		vPortTickInterruptHandler
 	
-vT1InterruptHandler:
+vPortTickInterruptHandler:
 
 	portSAVE_CONTEXT
 
@@ -97,7 +97,7 @@ vT1InterruptHandler:
 
 	portRESTORE_CONTEXT
 
-	.end vT1InterruptHandler
+	.end vPortTickInterruptHandler
 
 /******************************************************************/