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406 changed files with 108795 additions and 106323 deletions
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@ -26,9 +26,9 @@
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/*-----------------------------------------------------------
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* Implementation of functions defined in portable.h for the Tern EE 186
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* port.
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*----------------------------------------------------------*/
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* Implementation of functions defined in portable.h for the Tern EE 186
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* port.
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*----------------------------------------------------------*/
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/* Library includes. */
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#include <embedded.h>
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@ -40,199 +40,200 @@
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#include "portasm.h"
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/* The timer increments every four clocks, hence the divide by 4. */
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#define portTIMER_COMPARE ( uint16_t ) ( ( configCPU_CLOCK_HZ / configTICK_RATE_HZ ) / ( uint32_t ) 4 )
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#define portTIMER_COMPARE ( uint16_t ) ( ( configCPU_CLOCK_HZ / configTICK_RATE_HZ ) / ( uint32_t ) 4 )
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/* From the RDC data sheet. */
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#define portENABLE_TIMER_AND_INTERRUPT ( uint16_t ) 0xe001
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#define portENABLE_TIMER_AND_INTERRUPT ( uint16_t ) 0xe001
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/* Interrupt control. */
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#define portEIO_REGISTER 0xff22
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#define portCLEAR_INTERRUPT 0x0008
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#define portEIO_REGISTER 0xff22
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#define portCLEAR_INTERRUPT 0x0008
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/* Setup the hardware to generate the required tick frequency. */
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static void prvSetupTimerInterrupt( void );
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/* The ISR used depends on whether the preemptive or cooperative scheduler
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is being used. */
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#if( configUSE_PREEMPTION == 1 )
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/* Tick service routine used by the scheduler when preemptive scheduling is
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being used. */
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static void __interrupt __far prvPreemptiveTick( void );
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* is being used. */
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#if ( configUSE_PREEMPTION == 1 )
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/* Tick service routine used by the scheduler when preemptive scheduling is
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* being used. */
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static void __interrupt __far prvPreemptiveTick( void );
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#else
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/* Tick service routine used by the scheduler when cooperative scheduling is
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being used. */
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static void __interrupt __far prvNonPreemptiveTick( void );
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/* Tick service routine used by the scheduler when cooperative scheduling is
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* being used. */
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static void __interrupt __far prvNonPreemptiveTick( void );
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#endif
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/* Trap routine used by taskYIELD() to manually cause a context switch. */
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static void __interrupt __far prvYieldProcessor( void );
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/* The timer initialisation functions leave interrupts enabled,
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which is not what we want. This ISR is installed temporarily in case
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the timer fires before we get a change to disable interrupts again. */
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* which is not what we want. This ISR is installed temporarily in case
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* the timer fires before we get a change to disable interrupts again. */
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static void __interrupt __far prvDummyISR( void );
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/*-----------------------------------------------------------*/
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/* See header file for description. */
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StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t pxCode, void *pvParameters )
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StackType_t * pxPortInitialiseStack( StackType_t * pxTopOfStack,
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TaskFunction_t pxCode,
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void * pvParameters )
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{
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StackType_t DS_Reg = 0;
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StackType_t DS_Reg = 0;
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/* Place a few bytes of known values on the bottom of the stack.
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This is just useful for debugging. */
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/* Place a few bytes of known values on the bottom of the stack.
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* This is just useful for debugging. */
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*pxTopOfStack = 0x1111;
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pxTopOfStack--;
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*pxTopOfStack = 0x2222;
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pxTopOfStack--;
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*pxTopOfStack = 0x3333;
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pxTopOfStack--;
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*pxTopOfStack = 0x1111;
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pxTopOfStack--;
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*pxTopOfStack = 0x2222;
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pxTopOfStack--;
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*pxTopOfStack = 0x3333;
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pxTopOfStack--;
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/* We are going to start the scheduler using a return from interrupt
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instruction to load the program counter, so first there would be the
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function call with parameters preamble. */
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*pxTopOfStack = FP_SEG( pvParameters );
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pxTopOfStack--;
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*pxTopOfStack = FP_OFF( pvParameters );
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pxTopOfStack--;
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*pxTopOfStack = FP_SEG( pxCode );
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pxTopOfStack--;
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*pxTopOfStack = FP_OFF( pxCode );
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pxTopOfStack--;
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/* We are going to start the scheduler using a return from interrupt
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* instruction to load the program counter, so first there would be the
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* function call with parameters preamble. */
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/* Next the status register and interrupt return address. */
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*pxTopOfStack = portINITIAL_SW;
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pxTopOfStack--;
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*pxTopOfStack = FP_SEG( pxCode );
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pxTopOfStack--;
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*pxTopOfStack = FP_OFF( pxCode );
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pxTopOfStack--;
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*pxTopOfStack = FP_SEG( pvParameters );
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pxTopOfStack--;
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*pxTopOfStack = FP_OFF( pvParameters );
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pxTopOfStack--;
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*pxTopOfStack = FP_SEG( pxCode );
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pxTopOfStack--;
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*pxTopOfStack = FP_OFF( pxCode );
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pxTopOfStack--;
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/* The remaining registers would be pushed on the stack by our context
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switch function. These are loaded with values simply to make debugging
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easier. */
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*pxTopOfStack = ( StackType_t ) 0xAAAA; /* AX */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xBBBB; /* BX */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xCCCC; /* CX */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xDDDD; /* DX */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xEEEE; /* ES */
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pxTopOfStack--;
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/* Next the status register and interrupt return address. */
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*pxTopOfStack = portINITIAL_SW;
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pxTopOfStack--;
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*pxTopOfStack = FP_SEG( pxCode );
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pxTopOfStack--;
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*pxTopOfStack = FP_OFF( pxCode );
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pxTopOfStack--;
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/* We need the true data segment. */
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__asm{ MOV DS_Reg, DS };
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/* The remaining registers would be pushed on the stack by our context
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* switch function. These are loaded with values simply to make debugging
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* easier. */
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*pxTopOfStack = ( StackType_t ) 0xAAAA; /* AX */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xBBBB; /* BX */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xCCCC; /* CX */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xDDDD; /* DX */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xEEEE; /* ES */
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pxTopOfStack--;
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*pxTopOfStack = DS_Reg; /* DS */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x0123; /* SI */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xDDDD; /* DI */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xBBBB; /* BP */
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/* We need the true data segment. */
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__asm {
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MOV DS_Reg, DS
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};
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return pxTopOfStack;
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*pxTopOfStack = DS_Reg; /* DS */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x0123; /* SI */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xDDDD; /* DI */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xBBBB; /* BP */
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return pxTopOfStack;
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}
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/*-----------------------------------------------------------*/
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BaseType_t xPortStartScheduler( void )
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{
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/* This is called with interrupts already disabled. */
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/* This is called with interrupts already disabled. */
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/* Put our manual switch (yield) function on a known
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vector. */
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setvect( portSWITCH_INT_NUMBER, prvYieldProcessor );
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/* Put our manual switch (yield) function on a known
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* vector. */
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setvect( portSWITCH_INT_NUMBER, prvYieldProcessor );
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/* Setup the tick interrupt. */
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prvSetupTimerInterrupt();
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/* Setup the tick interrupt. */
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prvSetupTimerInterrupt();
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/* Kick off the scheduler by setting up the context of the first task. */
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portFIRST_CONTEXT();
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/* Kick off the scheduler by setting up the context of the first task. */
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portFIRST_CONTEXT();
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/* Should not get here! */
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return pdFALSE;
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/* Should not get here! */
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return pdFALSE;
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}
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/*-----------------------------------------------------------*/
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static void __interrupt __far prvDummyISR( void )
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{
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/* The timer initialisation functions leave interrupts enabled,
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which is not what we want. This ISR is installed temporarily in case
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the timer fires before we get a change to disable interrupts again. */
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outport( portEIO_REGISTER, portCLEAR_INTERRUPT );
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/* The timer initialisation functions leave interrupts enabled,
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* which is not what we want. This ISR is installed temporarily in case
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* the timer fires before we get a change to disable interrupts again. */
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outport( portEIO_REGISTER, portCLEAR_INTERRUPT );
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}
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/*-----------------------------------------------------------*/
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/* The ISR used depends on whether the preemptive or cooperative scheduler
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is being used. */
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#if( configUSE_PREEMPTION == 1 )
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static void __interrupt __far prvPreemptiveTick( void )
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{
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/* Get the scheduler to update the task states following the tick. */
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if( xTaskIncrementTick() != pdFALSE )
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{
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/* Switch in the context of the next task to be run. */
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portSWITCH_CONTEXT();
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}
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* is being used. */
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#if ( configUSE_PREEMPTION == 1 )
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static void __interrupt __far prvPreemptiveTick( void )
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{
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/* Get the scheduler to update the task states following the tick. */
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if( xTaskIncrementTick() != pdFALSE )
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{
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/* Switch in the context of the next task to be run. */
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portSWITCH_CONTEXT();
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}
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/* Reset interrupt. */
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outport( portEIO_REGISTER, portCLEAR_INTERRUPT );
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}
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#else
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static void __interrupt __far prvNonPreemptiveTick( void )
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{
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/* Same as preemptive tick, but the cooperative scheduler is being used
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so we don't have to switch in the context of the next task. */
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xTaskIncrementTick();
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/* Reset interrupt. */
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outport( portEIO_REGISTER, portCLEAR_INTERRUPT );
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}
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#endif
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/* Reset interrupt. */
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outport( portEIO_REGISTER, portCLEAR_INTERRUPT );
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}
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#else /* if ( configUSE_PREEMPTION == 1 ) */
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static void __interrupt __far prvNonPreemptiveTick( void )
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{
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/* Same as preemptive tick, but the cooperative scheduler is being used
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* so we don't have to switch in the context of the next task. */
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xTaskIncrementTick();
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/* Reset interrupt. */
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outport( portEIO_REGISTER, portCLEAR_INTERRUPT );
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}
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#endif /* if ( configUSE_PREEMPTION == 1 ) */
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/*-----------------------------------------------------------*/
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static void __interrupt __far prvYieldProcessor( void )
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{
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/* Switch in the context of the next task to be run. */
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portSWITCH_CONTEXT();
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/* Switch in the context of the next task to be run. */
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portSWITCH_CONTEXT();
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}
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/*-----------------------------------------------------------*/
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void vPortEndScheduler( void )
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{
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/* Not implemented. */
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/* Not implemented. */
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}
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/*-----------------------------------------------------------*/
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static void prvSetupTimerInterrupt( void )
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{
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const uint16_t usTimerACompare = portTIMER_COMPARE, usTimerAMode = portENABLE_TIMER_AND_INTERRUPT;
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const uint16_t usT2_IRQ = 0x13;
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const uint16_t usTimerACompare = portTIMER_COMPARE, usTimerAMode = portENABLE_TIMER_AND_INTERRUPT;
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const uint16_t usT2_IRQ = 0x13;
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/* Configure the timer, the dummy handler is used here as the init
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function leaves interrupts enabled. */
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t2_init( usTimerAMode, usTimerACompare, prvDummyISR );
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/* Configure the timer, the dummy handler is used here as the init
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* function leaves interrupts enabled. */
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t2_init( usTimerAMode, usTimerACompare, prvDummyISR );
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/* Disable interrupts again before installing the real handlers. */
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portDISABLE_INTERRUPTS();
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/* Disable interrupts again before installing the real handlers. */
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portDISABLE_INTERRUPTS();
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#if( configUSE_PREEMPTION == 1 )
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/* Tick service routine used by the scheduler when preemptive scheduling is
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being used. */
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setvect( usT2_IRQ, prvPreemptiveTick );
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#else
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/* Tick service routine used by the scheduler when cooperative scheduling is
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being used. */
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setvect( usT2_IRQ, prvNonPreemptiveTick );
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#endif
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#if ( configUSE_PREEMPTION == 1 )
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/* Tick service routine used by the scheduler when preemptive scheduling is
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* being used. */
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setvect( usT2_IRQ, prvPreemptiveTick );
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#else
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/* Tick service routine used by the scheduler when cooperative scheduling is
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* being used. */
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setvect( usT2_IRQ, prvNonPreemptiveTick );
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#endif
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}
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