M4的中断优先级配置

[复制链接]

scfor123456 提问时间：2019-9-17 15:02 /

void NVIC_Configuration(void)

{
NVIC_InitTypeDef NVIC_InitStructure;

/* 配置NVIC为优先级组1 */

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//高2位为抢占优先级，低2位为响应优先级

//中断1设置优先级

/* 配置中断源：按键1 */

NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn; //配置为EXTI0通道

/* 配置抢占优先级 */

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;

/* 配置子优先级 */

  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
/* 使能中断通道 */
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure); //将上述配置参数传入中断初始化函数

//中断2设置优先级

  /* 配置中断源：DMA1 */
  NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn;  //配置为DMA1_Channel1_IRQn通道
  /* 配置抢占优先级 */
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
  /* 配置子优先级 */
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  /* 使能中断通道 */
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure); //将上述配置参数传入中断初始化函数
}

这个设置中，EXTI0中断抢占优先级高于DMA1中断，所以EXTI0会打断DMA1中断，这样的写法对不对？