diff options
Diffstat (limited to 'portable/Paradigm/Tern_EE/small/port.c')
| -rw-r--r-- | portable/Paradigm/Tern_EE/small/port.c | 78 |
1 files changed, 35 insertions, 43 deletions
diff --git a/portable/Paradigm/Tern_EE/small/port.c b/portable/Paradigm/Tern_EE/small/port.c index 6d27ba991..2a1c0d962 100644 --- a/portable/Paradigm/Tern_EE/small/port.c +++ b/portable/Paradigm/Tern_EE/small/port.c @@ -28,9 +28,9 @@ /*----------------------------------------------------------- -* Implementation of functions defined in portable.h for the Tern EE 186 -* port. -*----------------------------------------------------------*/ + * Implementation of functions defined in portable.h for the Tern EE 186 + * port. + *----------------------------------------------------------*/ /* Library includes. */ #include <embedded.h> @@ -42,31 +42,29 @@ #include "portasm.h" /* The timer increments every four clocks, hence the divide by 4. */ -#define portPRESCALE_VALUE ( 16 ) -#define portTIMER_COMPARE ( configCPU_CLOCK_HZ / ( configTICK_RATE_HZ * 4UL ) ) +#define portPRESCALE_VALUE ( 16 ) +#define portTIMER_COMPARE ( configCPU_CLOCK_HZ / ( configTICK_RATE_HZ * 4UL ) ) /* From the RDC data sheet. */ -#define portENABLE_TIMER_AND_INTERRUPT ( uint16_t ) 0xe00b -#define portENABLE_TIMER ( uint16_t ) 0xC001 +#define portENABLE_TIMER_AND_INTERRUPT ( uint16_t ) 0xe00b +#define portENABLE_TIMER ( uint16_t ) 0xC001 /* Interrupt control. */ -#define portEIO_REGISTER 0xff22 -#define portCLEAR_INTERRUPT 0x0008 +#define portEIO_REGISTER 0xff22 +#define portCLEAR_INTERRUPT 0x0008 /* Setup the hardware to generate the required tick frequency. */ static void prvSetupTimerInterrupt( void ); /* The ISR used depends on whether the preemptive or cooperative scheduler - * is being used. */ -#if ( configUSE_PREEMPTION == 1 ) - -/* Tick service routine used by the scheduler when preemptive scheduling is - * being used. */ +is being used. */ +#if( configUSE_PREEMPTION == 1 ) + /* Tick service routine used by the scheduler when preemptive scheduling is + being used. */ static void __interrupt __far prvPreemptiveTick( void ); #else - -/* Tick service routine used by the scheduler when cooperative scheduling is - * being used. */ + /* Tick service routine used by the scheduler when cooperative scheduling is + being used. */ static void __interrupt __far prvNonPreemptiveTick( void ); #endif @@ -75,19 +73,15 @@ static void __interrupt __far prvYieldProcessor( void ); /*-----------------------------------------------------------*/ /* See header file for description. */ -StackType_t * pxPortInitialiseStack( StackType_t * pxTopOfStack, - TaskFunction_t pxCode, - void * pvParameters ) +StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t pxCode, void *pvParameters ) { - StackType_t DS_Reg = 0; +StackType_t DS_Reg = 0; /* We need the true data segment. */ - __asm { - MOV DS_Reg, DS - }; + __asm{ MOV DS_Reg, DS }; /* Place a few bytes of known values on the bottom of the stack. - * This is just useful for debugging. */ + This is just useful for debugging. */ *pxTopOfStack = 0x1111; pxTopOfStack--; @@ -97,8 +91,8 @@ StackType_t * pxPortInitialiseStack( StackType_t * pxTopOfStack, pxTopOfStack--; /* We are going to start the scheduler using a return from interrupt - * instruction to load the program counter, so first there would be the - * function call with parameters preamble. */ + instruction to load the program counter, so first there would be the + function call with parameters preamble. */ *pxTopOfStack = FP_OFF( pvParameters ); pxTopOfStack--; @@ -114,8 +108,8 @@ StackType_t * pxPortInitialiseStack( StackType_t * pxTopOfStack, pxTopOfStack--; /* The remaining registers would be pushed on the stack by our context - * switch function. These are loaded with values simply to make debugging - * easier. */ + switch function. These are loaded with values simply to make debugging + easier. */ *pxTopOfStack = ( StackType_t ) 0xAAAA; /* AX */ pxTopOfStack--; *pxTopOfStack = ( StackType_t ) 0xBBBB; /* BX */ @@ -127,7 +121,7 @@ StackType_t * pxPortInitialiseStack( StackType_t * pxTopOfStack, *pxTopOfStack = ( StackType_t ) 0xEEEE; /* ES */ pxTopOfStack--; - *pxTopOfStack = DS_Reg; /* DS */ + *pxTopOfStack = DS_Reg; /* DS */ pxTopOfStack--; *pxTopOfStack = ( StackType_t ) 0x0123; /* SI */ pxTopOfStack--; @@ -144,7 +138,7 @@ BaseType_t xPortStartScheduler( void ) /* This is called with interrupts already disabled. */ /* Put our manual switch (yield) function on a known - * vector. */ + vector. */ setvect( portSWITCH_INT_NUMBER, prvYieldProcessor ); /* Setup the tick interrupt. */ @@ -159,8 +153,8 @@ BaseType_t xPortStartScheduler( void ) /*-----------------------------------------------------------*/ /* The ISR used depends on whether the preemptive or cooperative scheduler - * is being used. */ -#if ( configUSE_PREEMPTION == 1 ) +is being used. */ +#if( configUSE_PREEMPTION == 1 ) static void __interrupt __far prvPreemptiveTick( void ) { /* Get the scheduler to update the task states following the tick. */ @@ -173,17 +167,17 @@ BaseType_t xPortStartScheduler( void ) /* Reset interrupt. */ outport( portEIO_REGISTER, portCLEAR_INTERRUPT ); } -#else /* if ( configUSE_PREEMPTION == 1 ) */ +#else static void __interrupt __far prvNonPreemptiveTick( void ) { /* Same as preemptive tick, but the cooperative scheduler is being used - * so we don't have to switch in the context of the next task. */ + so we don't have to switch in the context of the next task. */ xTaskIncrementTick(); /* Reset interrupt. */ outport( portEIO_REGISTER, portCLEAR_INTERRUPT ); } -#endif /* if ( configUSE_PREEMPTION == 1 ) */ +#endif /*-----------------------------------------------------------*/ static void __interrupt __far prvYieldProcessor( void ) @@ -201,21 +195,19 @@ void vPortEndScheduler( void ) static void prvSetupTimerInterrupt( void ) { - const uint32_t ulCompareValue = portTIMER_COMPARE; - uint16_t usTimerCompare; +const uint32_t ulCompareValue = portTIMER_COMPARE; +uint16_t usTimerCompare; usTimerCompare = ( uint16_t ) ( ulCompareValue >> 4 ); t2_init( portENABLE_TIMER, portPRESCALE_VALUE, NULL ); - #if ( configUSE_PREEMPTION == 1 ) - + #if( configUSE_PREEMPTION == 1 ) /* Tick service routine used by the scheduler when preemptive scheduling is - * being used. */ + being used. */ t1_init( portENABLE_TIMER_AND_INTERRUPT, usTimerCompare, usTimerCompare, prvPreemptiveTick ); #else - /* Tick service routine used by the scheduler when cooperative scheduling is - * being used. */ + being used. */ t1_init( portENABLE_TIMER_AND_INTERRUPT, usTimerCompare, usTimerCompare, prvNonPreemptiveTick ); #endif } |