/**
* @brief RITimer IRQ handler and timebase management
* @return Nothing
* @note This function keeps a timebase for LWIP that can be
* used for other functions.
*/
void OSEK_ISR_RIT_IRQHandler(void)
{
/* Clear RITimer Interrupt, Reload counter value */
Chip_RIT_ClearInt(LPC_RITIMER);
Chip_RIT_SetCOMPVAL(LPC_RITIMER, Chip_RIT_GetCounter(LPC_RITIMER) + reload_val);/* Reload value */
/* Increment tick count */
systick_timems += saved_period;
}
/**
* @brief Initialize tick interrupts
* @return Nothing
* @note This function initializes the tick interrupts, and must
* be called before starting the freeRTOS scheduler.
*/
void prvSetupTimerInterrupt(void)
{
/* Clear any pending interrupt */
Chip_RIT_ClearInt(LPC_RITIMER);
/* Calculate reload value */
reload_val = (configCPU_CLOCK_HZ / configTICK_RATE_HZ);
Chip_RIT_SetCOMPVAL(LPC_RITIMER, Chip_RIT_GetCounter(LPC_RITIMER) + reload_val);/* Start tick */
/* Set the priority and enable the interrupt */
NVIC_SetPriority((IRQn_Type) RITIMER_IRQn, portNVIC_SYSTICK_PRI);
NVIC_EnableIRQ((IRQn_Type) RITIMER_IRQn);
}
/* Set timer interval value */
void Chip_RIT_SetTimerInterval_(LPC_RITIMER_T *pRITimer, uint32_t time_interval)
{
uint32_t cmp_value;
/* Determine aapproximate compare value based on clock rate and passed interval */
cmp_value = ((Chip_Clock_GetRate(CLK_MX_RITIMER) / 1000) * time_interval )/ 1000;
/* Set timer compare value */
Chip_RIT_SetCOMPVAL(pRITimer, cmp_value);
/* Set timer enable clear bit to clear timer to 0 whenever
counter value equals the contents of RICOMPVAL */
Chip_RIT_EnableCTRL(pRITimer, RIT_CTRL_ENCLR);
}
/* Enable LWIP tick and interrupt */
void lwipSysTick_Enable(uint32_t period)
{
saved_period = period;
/* Clear any pending interrupt */
Chip_RIT_ClearInt(LPC_RITIMER);
/* Calculate reload value */
reload_val = ( SystemCoreClock / ( 1000 / period ) );
Chip_RIT_SetCOMPVAL(LPC_RITIMER, Chip_RIT_GetCounter(LPC_RITIMER) + reload_val);/* Let it tick */
/* Set the priority and enable the interrupt */
NVIC_SetPriority((IRQn_Type) RITIMER_IRQn, RITIMER_IRQn_PRI);
NVIC_EnableIRQ((IRQn_Type) RITIMER_IRQn);
}
/**
* @brief RITimer IRQ handler and timebase management
* @return Nothing
* @note This function keeps a timebase for LWIP that can be
* used for other functions.
*/
void RIT_IRQHandler(void)
{
#define CONTEXT_ISR2 3
typedef uint8_t ContextType;
extern ContextType ActualContext;
ContextType ctx = ActualContext;
ActualContext = CONTEXT_ISR2;
/* Clear RITimer Interrupt, Reload counter value */
Chip_RIT_ClearInt(LPC_RITIMER);
Chip_RIT_SetCOMPVAL(LPC_RITIMER, Chip_RIT_GetCounter(LPC_RITIMER) + reload_val);/* Reload value */
/* Increment tick count */
systick_timems += saved_period;
ActualContext = ctx;
}
/**
* @brief Tick interrupt handler routine
* @return Nothing
* @note This function handles the tick interrupts that are generated by RITIMER.
*/
void xPortSysTickHandler(void)
{
unsigned long ulDummy;
/* TODO: check if WWDT interrupt and redirect */
Chip_RIT_ClearInt(LPC_RITIMER);
Chip_RIT_SetCOMPVAL(LPC_RITIMER, Chip_RIT_GetCounter(LPC_RITIMER) + reload_val);/* Reload value */
#if configUSE_PREEMPTION == 1
/* If using preemption, also force a context switch. */
*(portNVIC_INT_CTRL) = portNVIC_PENDSVSET;
#endif
ulDummy = portSET_INTERRUPT_MASK_FROM_ISR();
{
vTaskIncrementTick();
}
portCLEAR_INTERRUPT_MASK_FROM_ISR(ulDummy);
}
/** \brief Set timer interval value in microseconds */
void Chip_RIT_SetTimerIntervaluS(LPC_RITIMER_T *pRITimer, uint32_t time_interval_us)
{
/** \details
* This method is a copy of Chip_RIT_SetTimerInterval provided by vendor, in which
* I made a minimal change to obtain a function that uses as parameter a number
* in microseconds to interrupt with the RIT timer
*
* \param LPC_RITIMER_T *pRITimer: pointer to the RIT timer.
* \param uint32_t time_interval_us: time interval in microseconds.
*
* \return nothing
* */
uint32_t cmp_value;
/* Determine approximate compare value based on clock rate and passed interval */
cmp_value = (Chip_Clock_GetRate(CLK_MX_RITIMER)/1000000) * time_interval_us;
/* Set timer compare value */
Chip_RIT_SetCOMPVAL(pRITimer, cmp_value);
/* Set timer enable clear bit to clear timer to 0 whenever
counter value equals the contents of RICOMPVAL */
Chip_RIT_EnableCTRL(pRITimer, RIT_CTRL_ENCLR);
}
/**
* @brief Tick interrupt handler routine
* @return Nothing
* @note This function handles the tick interrupts that are generated by RITIMER.
*/
void RIT_IRQHandler(void)
{
unsigned long ulPreviousMask;
/* TODO: check if WWDT interrupt and redirect */
Chip_RIT_ClearInt(LPC_RITIMER);
Chip_RIT_SetCOMPVAL(LPC_RITIMER, Chip_RIT_GetCounter(LPC_RITIMER) + reload_val);/* Reload value */
#if configUSE_PREEMPTION == 1
/* If using preemption, also force a context switch. */
*(portNVIC_INT_CTRL) = portNVIC_PENDSVSET;
#endif
ulPreviousMask = portSET_INTERRUPT_MASK_FROM_ISR();
{
/* Increment the RTOS tick. */
if( xTaskIncrementTick() != pdFALSE )
{
/* Pend a context switch. */
*(portNVIC_INT_CTRL) = portNVIC_PENDSVSET;
}
}
portCLEAR_INTERRUPT_MASK_FROM_ISR( ulPreviousMask );
}