stm32 freeRTOS NVIC中断优先级该怎么设置呢

liujinyi

在freeRTOSConfig.h中有

1. /* This is the raw value as per the Cortex-M3 NVIC.  Values can be 255
   
2. (lowest) to 0 (1?) (highest). */
   
3. #define configKERNEL_INTERRUPT_PRIORITY                 255
   
4. /* !!!! configMAX_SYSCALL_INTERRUPT_PRIORITY must not be set to zero !!!!
   
5. See http://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html. */
   
6. #define configMAX_SYSCALL_INTERRUPT_PRIORITY         191 /* equivalent to 0xb0, or priority 11. */
   
7. 
   
8. 
   
9. /* This is the value being used as per the ST library which permits 16
   
10. priority values, 0 to 15.  This must correspond to the
    
11. configKERNEL_INTERRUPT_PRIORITY setting.  Here 15 corresponds to the lowest
    
12. NVIC value of 255. */
    
13. #define configLIBRARY_KERNEL_INTERRUPT_PRIORITY        15
    
14. 
    
15. #endif /* FREERTOS_CONFIG_H */

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这跟我NVIC设置成哪个组合哪级抢占优先级有关系么

liujinyi

看了下这篇文章http://www.lifetyper.com/2014/03 ... -isr-api-issue.html
难道是要设置成NVIC_PriorityGroup_4 ，抢占优先级设置成192-255？

#define configMAX_PRIORITIES                ( 5 )
还是抢占优先级设置成0-5？

liujinyi

实际试了下NVIC_PriorityGroup_4   试了优先级1、11,100,200 都能成串口中断发送队列，任务能够接收到队列，那这设置是什么用的呢

xQueueSendFromISR(xQueueGprsReceive,Usart3Buff,&pxHigherPriorityTaskWoken);