有哪位大侠能解释一下，下面红线部分，有那些内核中断不能被设置？
/**
* @brief Set the priority for an interrupt
*
* @param IRQn The number of the interrupt for set priority
* @param priority The priority to set
*
* Set 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: 这个优先级并不能设置每一个内核中断。---The priority cannot be set for every core interrupt.
*/
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-M3 System Interrupts */
else {
NVIC->IP[(uint32_t)(IRQn)] = ((priority << (8 - __NVIC_PRIO_BITS)) & 0xff); } /* set Priority for device specific Interrupts */
} |
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