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Continue work on Risc V port.

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This commit is contained in:
Richard Barry 2018-11-06 02:04:28 +00:00
parent 74d0d16aab
commit baee711cb6
3 changed files with 45 additions and 12 deletions
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38
FreeRTOS/Source/portable/GCC/RISC-V-RV32/port.c
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@ -50,6 +50,7 @@ static void prvTaskExitError( void );
/* Used to program the machine timer compare register. */
static uint64_t ullNextTime = 0ULL;
static const uint64_t ullTimerIncrementsForOneTick = ( uint64_t ) ( configCPU_CLOCK_HZ / configTICK_RATE_HZ );
static volatile uint64_t * const pullMachineTimerCompareRegister = ( volatile uint64_t * const ) ( configCTRL_BASE + 0x4000 );
/*-----------------------------------------------------------*/
@ -165,8 +166,8 @@ StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t px
void vPortSetupTimerInterrupt( void )
{
uint32_t ulCurrentTimeHigh, ulCurrentTimeLow;
volatile uint32_t * const pulTimeHigh = ( volatile uint32_t * const ) ( configCTRL_BASE + 0xBFF8 );
volatile uint32_t * const pulTimeLow = ( volatile uint32_t * const ) ( configCTRL_BASE + 0xBFFc );
volatile uint32_t * const pulTimeHigh = ( volatile uint32_t * const ) ( configCTRL_BASE + 0xBFFC );
volatile uint32_t * const pulTimeLow = ( volatile uint32_t * const ) ( configCTRL_BASE + 0xBFF8 );
do
{
@ -177,9 +178,12 @@ volatile uint32_t * const pulTimeLow = ( volatile uint32_t * const ) ( configCTR
ullNextTime = ( uint64_t ) ulCurrentTimeHigh;
ullNextTime <<= 32ULL;
ullNextTime |= ( uint64_t ) ulCurrentTimeLow;
ullNextTime += ( configCPU_CLOCK_HZ / configTICK_RATE_HZ );
ullNextTime += ullTimerIncrementsForOneTick;
*pullMachineTimerCompareRegister = ullNextTime;
/* Prepare the time to use after the next tick interrupt. */
ullNextTime += ullTimerIncrementsForOneTick;
/* Enable timer interrupt */
__asm volatile( "csrs mie, %0" :: "r"(0x80) );
}
@ -192,8 +196,34 @@ volatile uint32_t * const ulSoftInterrupt = ( uint32_t * ) configCTRL_BASE;
vTaskSwitchContext();
/* Clear software interrupt. */
*ulSoftInterrupt = 0UL;
*( ( uint32_t * ) configCTRL_BASE ) = 0UL;
}
/*-----------------------------------------------------------*/
void Timer_IRQHandler( void )
{
/* Reload for the next timer interrupt. */
*pullMachineTimerCompareRegister = ullNextTime;
ullNextTime += ullTimerIncrementsForOneTick;
if( xTaskIncrementTick() != pdFALSE )
{
portYIELD();
}
}
/*-----------------------------------------------------------*/
BaseType_t xPortStartScheduler( void )
{
extern void xPortStartFirstTask( void );
vPortSetupTimerInterrupt();
xPortStartFirstTask();
/* Should not get here as after calling xPortStartFirstTask() only tasks
should be executing. */
return pdFAIL;
}