stm32 中断优先级设置错误会导致什么后果

void BOARD_NVIC_Init(void)

{

        NVIC_InitTypeDef   NVIC_InitStructure;



        /* Set the Vector Table base location at 0x08000000 */

        NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0); //设置中断矢量表，加载FLASH的位置



        /* 2 bit for pre-emption priority, 2 bits for subpriority */

        NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //设置优先级分组



        /*定时器中断*/

        NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;

        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;

        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

        NVIC_Init(&NVIC_InitStructure);



        NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; //通道设置为串口1中断

        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; //中断占先等级0

        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; //中断响应优先级0

        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //打开中断

        NVIC_Init(&NVIC_InitStructure);



        NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn; //通道设置为串口2中断

        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; //中断占先等级0

        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;               //中断响应优先级0

        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;           //打开中断

        NVIC_Init(&NVIC_InitStructure);



        NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;//通道设置为串口3中断

        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 10; //中断占先等级0

        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;               //中断响应优先级0

        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;           //打开中断

        NVIC_Init(&NVIC_InitStructure);



        NVIC_InitStructure.NVIC_IRQChannel = UART4_IRQn;//通道设置为串口4中断

        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 10; //中断占先等级0

        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;               //中断响应优先级0

        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;           //打开中断

        NVIC_Init(&NVIC_InitStructure);



    //DMA发送中断设置 (串口3 发送中断)

    NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel2_IRQn;

    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;

    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;

    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

    NVIC_Init(&NVIC_InitStructure);



        /*外部IO中断*/

        NVIC_InitStructure.NVIC_IRQChannel = EXTI4_IRQn;

        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 4;

        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;

        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

        NVIC_Init(&NVIC_InitStructure);



        /*外部IO中断*/

        NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;

        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 4;

        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;

        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

        NVIC_Init(&NVIC_InitStructure);

}