STM32—NVIC（标准库）

       STM32所有的中断都有NVIC（中断向量控制器）进行控制优先级的控制，既所有中断都需要先配置NVIC

    注意：NVIC不需要开启时钟，直接进行配置

   1.NVIC函数库讲解：在固件库—— misc 函数库中

    NVIC分组:  void NVIC_PriorityGroupConfig(uint32_t NVIC_PriorityGroup)

/**
  * @brief  Configures the priority grouping: pre-emption priority and subpriority.
  * @param  NVIC_PriorityGroup: specifies the priority grouping bits length. 
  *   This parameter can be one of the following values:
  *     @arg NVIC_PriorityGroup_0: 0 bits for pre-emption priority
  *                                4 bits for subpriority
  *     @arg NVIC_PriorityGroup_1: 1 bits for pre-emption priority  //抢占优先级
  *                                3 bits for subpriority           //响应优先级
  *     @arg NVIC_PriorityGroup_2: 2 bits for pre-emption priority
  *                                2 bits for subpriority
  *     @arg NVIC_PriorityGroup_3: 3 bits for pre-emption priority
  *                                1 bits for subpriority
  *     @arg NVIC_PriorityGroup_4: 4 bits for pre-emption priority
  *                                0 bits for subpriority
  * @retval None
  */


void NVIC_PriorityGroupConfig(uint32_t NVIC_PriorityGroup)
{
  .......
}


配置 抢占优先级(pre-emption priority) 和 响应优先级(subpriority) 的个数

注意:优先级数量一旦配置,则整个程序后面就不能更改

  NVIC参数初始化:      void NVIC_Init(NVIC_InitTypeDef* NVIC_InitStruct)

/**
  * @brief  Initializes the NVIC peripheral according to the specified
  *         parameters in the NVIC_InitStruct.
  * @param  NVIC_InitStruct: pointer to a NVIC_InitTypeDef structure that contains
  *         the configuration information for the specified NVIC peripheral.
  * @retval None
  */


void NVIC_Init(NVIC_InitTypeDef* NVIC_InitStruct)
{

}

结构体参数


NVIC_InitStruct.NVIC_IRQChannel  :     选择中断的类型

NVIC_InitStruct.NVIC_IRQChannelCmd  :  是否使能所选中断的通道

NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority  : 设置 抢占优先级 (0~15)

NVIC_InitStruct.NVIC_IRQChannelSubPriority  :  设置 响应优先级 (0~15)

其他功能函数

功能函数1: