STM32 NVIC中断优先级管理通过结构图快速理解

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📑抢占优先级和响应优先级基本常识

• 🌿抢占优先级的级别高于响应优先级。
• 🌿抢占优先级数值编号越小，所代表的优先级就越高；同理，响应优先级也是如此。
• 🔖HAL优先组函数：

/*** @brief  Sets the priority grouping field (preemption priority and subpriority)*         using the required unlock sequence.* @param  PriorityGroup: The priority grouping bits length. *         This parameter can be one of the following values:*         @arg NVIC_PRIORITYGROUP_0: 0 bits for preemption priority*                                    4 bits for subpriority*         @arg NVIC_PRIORITYGROUP_1: 1 bits for preemption priority*                                    3 bits for subpriority*         @arg NVIC_PRIORITYGROUP_2: 2 bits for preemption priority*                                    2 bits for subpriority*         @arg NVIC_PRIORITYGROUP_3: 3 bits for preemption priority*                                    1 bits for subpriority*         @arg NVIC_PRIORITYGROUP_4: 4 bits for preemption priority*                                    0 bits for subpriority* @note   When the NVIC_PriorityGroup_0 is selected, IRQ preemption is no more possible. *         The pending IRQ priority will be managed only by the subpriority. * @retval None*/
void HAL_NVIC_SetPriorityGrouping(uint32_t PriorityGroup)
{/* Check the parameters */assert_param(IS_NVIC_PRIORITY_GROUP(PriorityGroup));/* Set the PRIGROUP[10:8] bits according to the PriorityGroup parameter value */NVIC_SetPriorityGrouping(PriorityGroup);
}

• 🌿对于STM32f1系列，可分配有4组：
  
• • 🍁NVIC_PRIORITYGROUP_0
    

HAL_NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_0);
HAL_NVIC_SetPriority(TIM5_IRQn, 0, 15);//中断号，抢占优先级(0),子优先级(0-15)

• • 🍁NVIC_PRIORITYGROUP_1
    

HAL_NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_1);
HAL_NVIC_SetPriority(TIM5_IRQn, 1, 7);//中断号，抢占优先级(0-1),子优先级(0-7)

• • 🍁NVIC_PRIORITYGROUP_2

HAL_NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_2);
HAL_NVIC_SetPriority(TIM5_IRQn, 3, 3);//中断号，抢占优先级(0-3),子优先级(0-3)

• • 🍁NVIC_PRIORITYGROUP_3

HAL_NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_3);
HAL_NVIC_SetPriority(TIM5_IRQn, 7, 1);//中断号，抢占优先级(0-7),子优先级(0-1)

• • 🍁NVIC_PRIORITYGROUP_4
    

HAL_NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);
HAL_NVIC_SetPriority(TIM5_IRQn, 15, 0);//中断号，抢占优先级(0-15),子优先级(0)