C
@arg NVIC_PriorityGroup_0: 0 bits for pre-emption priority //不支持抢占优先级
* 4 bits for subpriority //支持16个响应优先级
* @arg NVIC_PriorityGroup_1: 1 bits for pre-emption priority //支持2个抢占优先级
* 3 bits for //支持8个响应优先级
* @arg NVIC_PriorityGroup_2: 2 bits for pre-emption priority //支持4个抢占优先级
* 2 bits for subpriority //支持4个响应优先级
* @arg NVIC_PriorityGroup_3: 3 bits for pre-emption priority //支持8个抢占优先级
* 1 bits for subpriority //支持2个响应优先级
* @arg NVIC_PriorityGroup_4: 4 bits for pre-emption priority //支持16个抢占优先级
* 0 bits for subpriority //不支持响应优先级
C
//设置优先级
//中断优先级的组配置:选择第二组,支持4个抢占优先级(0~3),支持4个响应优先级(0~3),
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

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