本帖最后由 adsbear 于 2010-7-15 11:25 编辑
/* Preemption Priority Group -------------------------------------------------*/
#define NVIC_PriorityGroup_0 ((u32)0x700) /* 0 bits for pre-emption priority
4 bits for subpriority */
#define NVIC_PriorityGroup_1 ((u32)0x600) /* 1 bits for pre-emption priority
3 bits for subpriority */
#define NVIC_PriorityGroup_2 ((u32)0x500) /* 2 bits for pre-emption priority
2 bits for subpriority */
#define NVIC_PriorityGroup_3 ((u32)0x400) /* 3 bits for pre-emption priority
1 bits for subpriority */
#define NVIC_PriorityGroup_4 ((u32)0x300) /* 4 bits for pre-emption priority
0 bits for subpriority */
比如：
/* Configure one bit for preemption priority */
//NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
不设置优先级分组的话：
？ bits for pre-emption priority ？ bits for subpriority |
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