APM32F103的中断优先级组如何使用
极海APM32F103系列的MCU有中断优先级组的概念。通过查看代码可以看到极海官方定义了5个优先级。查看apm32f10x_misc.c/.h源文件，如下：
- /**
- * [url=home.php?mod=space&uid=247401]@brief[/url] nvic priority group
- */
- typedef enum
- {
- NVIC_PRIORITY_GROUP_0 = 0x700, /*!< 0 bits for pre-emption priority,4 bits for subpriority */
- NVIC_PRIORITY_GROUP_1 = 0x600, /*!< 1 bits for pre-emption priority,3 bits for subpriority */
- NVIC_PRIORITY_GROUP_2 = 0x500, /*!< 2 bits for pre-emption priority,2 bits for subpriority */
- NVIC_PRIORITY_GROUP_3 = 0x400, /*!< 3 bits for pre-emption priority,1 bits for subpriority */
- NVIC_PRIORITY_GROUP_4 = 0x300 /*!< 4 bits for pre-emption priority,0 bits for subpriority */
- } NVIC_PRIORITY_GROUP_T;
- /*!
- * [url=home.php?mod=space&uid=247401]@brief[/url] Configures the priority grouping: pre-emption priority and subpriority.
- *
- * @param priorityGroup : specifies the priority grouping bits length.
- * This parameter can be one of the following values:
- * [url=home.php?mod=space&uid=2817080]@ARG[/url] NVIC_PRIORITY_GROUP_0
- * @arg NVIC_PRIORITY_GROUP_1
- * @arg NVIC_PRIORITY_GROUP_2
- * @arg NVIC_PRIORITY_GROUP_3
- * @arg NVIC_PRIORITY_GROUP_4
- *
- * @retval None
- */
- void NVIC_ConfigPriorityGroup(NVIC_PRIORITY_GROUP_T priorityGroup)
- {
- SCB->AIRCR = AIRCR_VECTKEY_MASK | priorityGroup;
- }
我看极海官方示例里面，有用优先级2的，也有用优先级4的！所以问题来了，
大家在项目中都使用哪个优先级组？
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