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Soren Ptak 2023-09-05 17:24:04 -04:00 • committed by GitHub
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91
portable/GCC/H8S2329/port.c
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@ -32,22 +32,22 @@
/*-----------------------------------------------------------
* Implementation of functions defined in portable.h for the H8S port.
*----------------------------------------------------------*/
* Implementation of functions defined in portable.h for the H8S port.
*----------------------------------------------------------*/
/*-----------------------------------------------------------*/
/* When the task starts interrupts should be enabled. */
#define portINITIAL_CCR ( ( StackType_t ) 0x00 )
#define portINITIAL_CCR ( ( StackType_t ) 0x00 )
/* Hardware specific constants used to generate the RTOS tick from the TPU. */
#define portCLEAR_ON_TGRA_COMPARE_MATCH ( ( uint8_t ) 0x20 )
#define portCLOCK_DIV_64 ( ( uint8_t ) 0x03 )
#define portCLOCK_DIV ( ( uint32_t ) 64 )
#define portTGRA_INTERRUPT_ENABLE ( ( uint8_t ) 0x01 )
#define portTIMER_CHANNEL ( ( uint8_t ) 0x02 )
#define portMSTP13 ( ( uint16_t ) 0x2000 )
#define portCLEAR_ON_TGRA_COMPARE_MATCH ( ( uint8_t ) 0x20 )
#define portCLOCK_DIV_64 ( ( uint8_t ) 0x03 )
#define portCLOCK_DIV ( ( uint32_t ) 64 )
#define portTGRA_INTERRUPT_ENABLE ( ( uint8_t ) 0x01 )
#define portTIMER_CHANNEL ( ( uint8_t ) 0x02 )
#define portMSTP13 ( ( uint16_t ) 0x2000 )
/*
* Setup TPU channel one for the RTOS tick at the requested frequency.
@ -57,26 +57,29 @@ static void prvSetupTimerInterrupt( void );
/*
* The ISR used by portYIELD(). This is installed as a trap handler.
*/
void vPortYield( void ) __attribute__ ( ( saveall, interrupt_handler ) );
void vPortYield( void ) __attribute__( ( saveall, interrupt_handler ) );
/*-----------------------------------------------------------*/
/*
* 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 )
{
uint32_t ulValue;
uint32_t ulValue;
/* This requires an even address. */
ulValue = ( uint32_t ) pxTopOfStack;
if( ulValue & 1UL )
{
pxTopOfStack = pxTopOfStack - 1;
}
/* 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--;
*pxTopOfStack = 0xaa;
pxTopOfStack--;
@ -87,7 +90,7 @@ uint32_t ulValue;
*pxTopOfStack = 0xdd;
/* The initial stack mimics an interrupt stack. First there is the program
counter (24 bits). */
* counter (24 bits). */
ulValue = ( uint32_t ) pxCode;
pxTopOfStack--;
@ -104,8 +107,8 @@ uint32_t ulValue;
*pxTopOfStack = portINITIAL_CCR;
/* Next all the general purpose registers - with the parameters being passed
in ER0. The parameter order must match that used by the compiler when the
"saveall" function attribute is used. */
* in ER0. The parameter order must match that used by the compiler when the
* "saveall" function attribute is used. */
/* ER6 */
pxTopOfStack--;
@ -188,22 +191,22 @@ uint32_t ulValue;
BaseType_t xPortStartScheduler( void )
{
extern void * pxCurrentTCB;
extern void * pxCurrentTCB;
/* Setup the hardware to generate the tick. */
prvSetupTimerInterrupt();
/* Restore the context of the first task that is going to run. This
mirrors the function epilogue code generated by the compiler when the
"saveall" function attribute is used. */
* mirrors the function epilogue code generated by the compiler when the
* "saveall" function attribute is used. */
asm volatile (
"MOV.L @_pxCurrentTCB, ER6 \n\t"
"MOV.L @ER6, ER7 \n\t"
"LDM.L @SP+, (ER4-ER5) \n\t"
"LDM.L @SP+, (ER0-ER3) \n\t"
"MOV.L @ER7+, ER6 \n\t"
"RTE \n\t"
);
"MOV.L @_pxCurrentTCB, ER6 \n\t"
"MOV.L @ER6, ER7 \n\t"
"LDM.L @SP+, (ER4-ER5) \n\t"
"LDM.L @SP+, (ER0-ER3) \n\t"
"MOV.L @ER7+, ER6 \n\t"
"RTE \n\t"
);
( void ) pxCurrentTCB;
@ -226,7 +229,7 @@ void vPortEndScheduler( void )
void vPortYield( void )
{
portSAVE_STACK_POINTER();
vTaskSwitchContext();
vTaskSwitchContext();
portRESTORE_STACK_POINTER();
}
/*-----------------------------------------------------------*/
@ -235,14 +238,14 @@ void vPortYield( void )
* The interrupt handler installed for the RTOS tick depends on whether the
* preemptive or cooperative scheduler is being used.
*/
#if( configUSE_PREEMPTION == 1 )
#if ( configUSE_PREEMPTION == 1 )
/*
* The preemptive scheduler is used so the ISR calls vTaskSwitchContext().
* The function prologue saves the context so all we have to do is save
* the stack pointer.
*/
void vTickISR( void ) __attribute__ ( ( saveall, interrupt_handler ) );
/*
* The preemptive scheduler is used so the ISR calls vTaskSwitchContext().
* The function prologue saves the context so all we have to do is save
* the stack pointer.
*/
void vTickISR( void ) __attribute__( ( saveall, interrupt_handler ) );
void vTickISR( void )
{
portSAVE_STACK_POINTER();
@ -258,14 +261,14 @@ void vPortYield( void )
portRESTORE_STACK_POINTER();
}
#else
#else /* if ( configUSE_PREEMPTION == 1 ) */
/*
* The cooperative scheduler is being used so all we have to do is
* periodically increment the tick. This can just be a normal ISR and
* the "saveall" attribute is not required.
*/
void vTickISR( void ) __attribute__ ( ( interrupt_handler ) );
/*
* The cooperative scheduler is being used so all we have to do is
* periodically increment the tick. This can just be a normal ISR and
* the "saveall" attribute is not required.
*/
void vTickISR( void ) __attribute__( ( interrupt_handler ) );
void vTickISR( void )
{
xTaskIncrementTick();
@ -274,7 +277,7 @@ void vPortYield( void )
TSR1 &= ~0x01;
}
#endif
#endif /* if ( configUSE_PREEMPTION == 1 ) */
/*-----------------------------------------------------------*/
/*
@ -282,7 +285,7 @@ void vPortYield( void )
*/
static void prvSetupTimerInterrupt( void )
{
const uint32_t ulCompareMatch = ( configCPU_CLOCK_HZ / configTICK_RATE_HZ ) / portCLOCK_DIV;
const uint32_t ulCompareMatch = ( configCPU_CLOCK_HZ / configTICK_RATE_HZ ) / portCLOCK_DIV;
/* Turn the module on. */
MSTPCR &= ~portMSTP13;
@ -294,7 +297,7 @@ const uint32_t ulCompareMatch = ( configCPU_CLOCK_HZ / configTICK_RATE_HZ ) / po
TGR1A = ulCompareMatch;
/* Start the timer and enable the interrupt - we can do this here as
interrupts are globally disabled when this function is called. */
* interrupts are globally disabled when this function is called. */
TIER1 |= portTGRA_INTERRUPT_ENABLE;
TSTR |= portTIMER_CHANNEL;
}