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RISC-V tasks now context switching to each other using taskYIELD() - not fully tested yet.

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This commit is contained in:
Richard Barry 2018-09-27 17:25:17 +00:00
parent 2bcb1ab02b
commit e3dc5e934b
3 changed files with 121 additions and 106 deletions
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18
FreeRTOS/Source/portable/GCC/RISC-V-RV32/port.c
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@ -50,14 +50,14 @@ static void prvTaskExitError( void );
/* Used to program the machine timer compare register. */
static uint64_t ullNextTime = 0ULL;
static volatile uint64_t * const pullMachineTimerCompareRegister = ( volatile uint64_t * const ) 0x2004000;
static volatile uint64_t * const pullMachineTimerCompareRegister = ( volatile uint64_t * const ) ( configCTRL_BASE + 0x4000 );
/*-----------------------------------------------------------*/
void prvTaskExitError( void )
{
volatile uint32_t ulx = 0;
#warning prvTaskExitError not used yet.
/* A function that implements a task must not exit or attempt to return to
its caller as there is nothing to return to. If a task wants to exit it
should instead call vTaskDelete( NULL ).
@ -154,6 +154,8 @@ StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t px
// pxTopOfStack--;
// *pxTopOfStack = ( StackType_t ) 2; /* Stack pointer. */
// pxTopOfStack--;
*pxTopOfStack = ( StackType_t ) prvTaskExitError;
pxTopOfStack--;
*pxTopOfStack = ( StackType_t ) pxCode;
return pxTopOfStack;
@ -163,8 +165,8 @@ 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 ) 0x200BFF8;
volatile uint32_t * const pulTimeLow = ( volatile uint32_t * const ) 0x200BFFc;
volatile uint32_t * const pulTimeHigh = ( volatile uint32_t * const ) ( configCTRL_BASE + 0xBFF8 );
volatile uint32_t * const pulTimeLow = ( volatile uint32_t * const ) ( configCTRL_BASE + 0xBFFc );
do
{
@ -185,9 +187,13 @@ volatile uint32_t * const pulTimeLow = ( volatile uint32_t * const ) 0x200BFFc;
void Software_IRQHandler( void )
{
volatile uint32_t * const ulSoftInterrupt = ( uint32_t * ) configCTRL_BASE;
vTaskSwitchContext();
/* Clear software interrupt. */
*ulSoftInterrupt = 0UL;
}
/*-----------------------------------------------------------*/