core_cm3.h

stm32f0固件库

  reg_value  =  SCB->AIRCR;                                                   /* read old register configuration    */
  reg_value &= ~(SCB_AIRCR_VECTKEY_Msk | SCB_AIRCR_PRIGROUP_Msk);             /* clear bits to change               */
  reg_value  =  (reg_value                                 |
                ((uint32_t)0x5FA << SCB_AIRCR_VECTKEY_Pos) |
                (PriorityGroupTmp << 8));                                     /* Insert write key and priorty group */
  SCB->AIRCR =  reg_value;
}


/** \brief  Get Priority Grouping

  This function gets the priority grouping from NVIC Interrupt Controller.
  Priority grouping is SCB->AIRCR [10:8] PRIGROUP field.

    \return                Priority grouping field
 */
static __INLINE uint32_t NVIC_GetPriorityGrouping(void)
{
  return ((SCB->AIRCR & SCB_AIRCR_PRIGROUP_Msk) >> SCB_AIRCR_PRIGROUP_Pos);   /* read priority grouping field */
}


/** \brief  Enable External Interrupt

    This function enables a device specific interrupt in the NVIC interrupt controller.
    The interrupt number cannot be a negative value.

    \param [in]      IRQn  Number of the external interrupt to enable
 */
static __INLINE void NVIC_EnableIRQ(IRQn_Type IRQn)
{
  NVIC->ISER[((uint32_t)(IRQn) >> 5)] = (1 << ((uint32_t)(IRQn) & 0x1F)); /* enable interrupt */
}


/** \brief  Disable External Interrupt

    This function disables a device specific interrupt in the NVIC interrupt controller.
    The interrupt number cannot be a negative value.

    \param [in]      IRQn  Number of the external interrupt to disable
 */
static __INLINE void NVIC_DisableIRQ(IRQn_Type IRQn)
{
  NVIC->ICER[((uint32_t)(IRQn) >> 5)] = (1 << ((uint32_t)(IRQn) & 0x1F)); /* disable interrupt */
}


/** \brief  Get Pending Interrupt

    This function reads the pending register in the NVIC and returns the pending bit
    for the specified interrupt.

    \param [in]      IRQn  Number of the interrupt for get pending
    \return             0  Interrupt status is not pending
    \return             1  Interrupt status is pending
 */
static __INLINE uint32_t NVIC_GetPendingIRQ(IRQn_Type IRQn)
{
  return((uint32_t) ((NVIC->ISPR[(uint32_t)(IRQn) >> 5] & (1 << ((uint32_t)(IRQn) & 0x1F)))?1:0)); /* Return 1 if pending else 0 */
}


/** \brief  Set Pending Interrupt

    This function sets the pending bit for the specified interrupt.
    The interrupt number cannot be a negative value.

    \param [in]      IRQn  Number of the interrupt for set pending
 */
static __INLINE void NVIC_SetPendingIRQ(IRQn_Type IRQn)
{
  NVIC->ISPR[((uint32_t)(IRQn) >> 5)] = (1 << ((uint32_t)(IRQn) & 0x1F)); /* set interrupt pending */
}


/** \brief  Clear Pending Interrupt

    This function clears the pending bit for the specified interrupt.
    The interrupt number cannot be a negative value.

    \param [in]      IRQn  Number of the interrupt for clear pending
 */
static __INLINE void NVIC_ClearPendingIRQ(IRQn_Type IRQn)
{
  NVIC->ICPR[((uint32_t)(IRQn) >> 5)] = (1 << ((uint32_t)(IRQn) & 0x1F)); /* Clear pending interrupt */
}


/** \brief  Get Active Interrupt

    This function reads the active register in NVIC and returns the active bit.
    \param [in]      IRQn  Number of the interrupt for get active
    \return             0  Interrupt status is not active
    \return             1  Interrupt status is active
 */
static __INLINE uint32_t NVIC_GetActive(IRQn_Type IRQn)
{
  return((uint32_t)((NVIC->IABR[(uint32_t)(IRQn) >> 5] & (1 << ((uint32_t)(IRQn) & 0x1F)))?1:0)); /* Return 1 if active else 0 */
}


/** \brief  Set Interrupt Priority

    This function sets the priority for the specified interrupt. The interrupt
    number can be positive to specify an external (device specific)
    interrupt, or negative to specify an internal (core) interrupt.

    Note: The priority cannot be set for every core interrupt.

    \param [in]      IRQn  Number of the interrupt for set priority
    \param [in]  priority  Priority to set
 */
static __INLINE void NVIC_SetPriority(IRQn_Type IRQn, uint32_t priority)
{
  if(IRQn < 0) {
    SCB->SHP[((uint32_t)(IRQn) & 0xF)-4] = ((priority << (8 - __NVIC_PRIO_BITS)) & 0xff); } /* set Priority for Cortex-M  System Interrupts */
  else {
    NVIC->IP[(uint32_t)(IRQn)] = ((priority << (8 - __NVIC_PRIO_BITS)) & 0xff);    }        /* set Priority for device specific Interrupts  */
}


/** \brief  Get Interrupt Priority

    This function reads the priority for the specified interrupt. The interrupt
    number can be positive to specify an external (device specific)
    interrupt, or negative to specify an internal (core) interrupt.

    The returned priority value is automatically aligned to the implemented
    priority bits of the microcontroller.

    \param [in]   IRQn  Number of the interrupt for get priority
    \return             Interrupt Priority
 */
static __INLINE uint32_t NVIC_GetPriority(IRQn_Type IRQn)
{

  if(IRQn < 0) {
    return((uint32_t)(SCB->SHP[((uint32_t)(IRQn) & 0xF)-4] >> (8 - __NVIC_PRIO_BITS)));  } /* get priority for Cortex-M  system interrupts */
  else {
    return((uint32_t)(NVIC->IP[(uint32_t)(IRQn)]           >> (8 - __NVIC_PRIO_BITS)));  } /* get priority for device specific interrupts  */
}


/** \brief  Encode Priority

    This function encodes the priority for an interrupt with the given priority group,
    preemptive priority value and sub priority value.
    In case of a conflict between priority grouping and available
    priority bits (__NVIC_PRIO_BITS) the samllest possible priority group is set.

    The returned priority value can be used for NVIC_SetPriority(...) function

    \param [in]     PriorityGroup  Used priority group
    \param [in]   PreemptPriority  Preemptive priority value (starting from 0)
    \param [in]       SubPriority  Sub priority value (starting from 0)
    \return                        Encoded priority for the interrupt
 */
static __INLINE uint32_t NVIC_EncodePriority (uint32_t PriorityGroup, uint32_t PreemptPriority, uint32_t SubPriority)
{
  uint32_t PriorityGroupTmp = (PriorityGroup & 0x07);          /* only values 0..7 are used          */
  uint32_t PreemptPriorityBits;
  uint32_t SubPriorityBits;

  PreemptPriorityBits = ((7 - PriorityGroupTmp) > __NVIC_PRIO_BITS) ? __NVIC_PRIO_BITS : 7 - PriorityGroupTmp;
  SubPriorityBits     = ((PriorityGroupTmp + __NVIC_PRIO_BITS) < 7) ? 0 : PriorityGroupTmp - 7 + __NVIC_PRIO_BITS;

  return (
           ((PreemptPriority & ((1 << (PreemptPriorityBits)) - 1)) << SubPriorityBits) |
           ((SubPriority     & ((1 << (SubPriorityBits    )) - 1)))
         );
}


/** \brief  Decode Priority

    This function decodes an interrupt priority value with the given priority group to
    preemptive priority value and sub priority value.
    In case of a conflict between priority grouping and available
    priority bits (__NVIC_PRIO_BITS) the samllest possible priority group is set.

    The priority value can be retrieved with NVIC_GetPriority(...) function

    \param [in]         Priority   Priority value
    \param [in]     PriorityGroup  Used priority group
    \param [out] pPreemptPriority  Preemptive priority value (starting from 0)
    \param [out]     pSubPriority  Sub priority value (starting from 0)
 */
static __INLINE void NVIC_DecodePriority (uint32_t Priority, uint32_t PriorityGroup, uint32_t* pPreemptPriority, uint32_t* pSubPriority)
{
  uint32_t PriorityGroupTmp = (PriorityGroup & 0x07);          /* only values 0..7 are used          */
  uint32_t PreemptPriorityBits;
  uint32_t SubPriorityBits;

  PreemptPriorityBits = ((7 - PriorityGroupTmp) > __NVIC_PRIO_BITS) ? __NVIC_PRIO_BITS : 7 - PriorityGroupTmp;
  SubPriorityBits     = ((PriorityGroupTmp + __NVIC_PRIO_BITS) < 7) ? 0 : PriorityGroupTmp - 7 + __NVIC_PRIO_BITS;

  *pPreemptPriority = (Priority >> SubPriorityBits) & ((1 << (PreemptPriorityBits)) - 1);
  *pSubPriority     = (Priority                   ) & ((1 << (SubPriorityBits    )) - 1);
}


/** \brief  System Reset

    This function initiate a system reset request to reset the MCU.
 */
static __INLINE void NVIC_SystemReset(void)
{
  __DSB();                                                     /* Ensure all outstanding memory accesses included
                                                                  buffered write are completed before reset */
  SCB->AIRCR  = ((0x5FA << SCB_AIRCR_VECTKEY_Pos)      |
                 (SCB->AIRCR & SCB_AIRCR_PRIGROUP_Msk) |
                 SCB_AIRCR_SYSRESETREQ_Msk);                   /* Keep priority group unchanged */
  __DSB();                                                     /* Ensure completion of memory access */
  while(1);                                                    /* wait until reset */
}

/*@} end of CMSIS_Core_NVICFunctions */



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