1. <p>//参考手册上代码如下</p><p>NVIC_InitTypeDef NVIC_InitStructure;
   
2. /* Configure the Priority Grouping with 1 bit */
   
3. NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
   
4. 
   
5. 
   
6. /* Enable tiM3 global interrupt with Preemption Priority 0 and SubPriority as 2 */
   
7. NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQChannel;
   
8. NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
   
9. NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
   
10. NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    
11. NVIC_InitStructure(&NVIC_InitStructure);
    
12. 
    
13. 
    
14. /* Enable USART1 global interrupt with Preemption Priority 1 and SubPriority as 5 */
    
15. NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
    
16. NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    
17. NVIC_InitStructure.NVIC_IRQChannelSubPriority = 5;
    
18. NVIC_InitStructure(&NVIC_InitStructure);
    
19. 
    
20. 
    
21. /* Enable <font color="red">RTC</font> <font color="red">global interrupt</font> with Preemption Priority 1 and SubPriority as 7 */
    
22. NVIC_InitStructure.NVIC_IRQChannel = RTC_IRQChannel;
    
23. NVIC_InitStructure.NVIC_IRQChannelSubPriority = 7;
    
24. NVIC_InitStructure(&NVIC_InitStructure);
    
25. 
    
26. 
    
27. /* Enable EXTI4 interrupt with Preemption Priority 1 and SubPriority as 7 */
    
28. NVIC_InitStructure.NVIC_IRQChannel = EXTI4_IRQChannel;
    
29. NVIC_InitStructure.NVIC_IRQChannelSubPriority = 7;
    
30. NVIC_InitStructure(&NVIC_InitStructure);
    
31. 
    
32. 
    
33. /* TIM3 interrupt priority is higher than USART1, RTC and EXTI4 interrupts priorities. USART1 interrupt priority is higher than RTC and EXTI4 interrupts priorities. <font color="red">RTC interrupt priority is higher than EXTI4 interrupt prioriy.</font> */
    
34. </p>

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这里最终是把RTC和TIM3都是设置成抢占优先级1，响应优先级7。
1.RTC interrupt priority is higher than EXTI4 interrupt prioriy.是不是错了？
2.global interrupt和普通中断有有什么区别吗？你是如何理解global interrupt的？
3.还有两个通道可以设置成一种优先级吗？？