Question

STM32 NVIC怎样配置中断优先级

NVIC寄存器怎么设置

Answer 1

可以参照STM32提供的库函数，中断优先级有抢占优先级和响应优先级之分，可以在NVIC寄存器里进行响应配置，优先级数字越小代表的优先级越高。STM32提供的库函数有如下的操作，
NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn; //中断线1全局中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //抢占优先级为2
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //响应优先级为0
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //允许EXTI0_IRQn中断
NVIC_Init(&NVIC_InitStructure);
你可以下载STM32固件库使用手册进行学习

Answer 2

用库函数比较方便啦
/* Enable CAN1 SCE interrupt IRQ channel */
NVIC_InitStructure.NVIC_IRQChannel = CAN1_SCE_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);