void NVIC_PriorityGroupConfig(uint32_t NVIC_PriorityGroup)
void NVIC_Init(NVIC_InitTypeDef* NVIC_InitStruct)
typedef struct NVIC_InitTypeDef｛
uint8_t NVIC_IRQChannel； //中断通道
uint8_t NVIC_IRQChannelPreemptionPriority; //抢占优先级
uint8_t NVIC_IRQChannelSubPriority; //响应优先级
FunctionalState NVIC_IRQChannelCmd; //中断通道使能
｝
typedef structNVIC_Type｛
__IO uint32_t ISER[8];
...
__IO uint8_t IP[240];
...
｝
中断优先级设置步骤：
a.系统运行后，首先进行中断优先级分组：NVIC_PriorityGroupConfig(uint32_t NVIC_PriorityGroup)
整个系统执行过程中只设置一次中断分组
b.针对每个中断进行初始化，设置抢占优先级和响应优先级以及使能：NVIC_Init(NVIC_InitTypeDef* NVIC_InitStruct)
c.若需要挂起/解挂，查看中断当前激活状态，分别调用相关函数