NVIC_InitTypeDef 是结构体的类型 NVIC_InitStructure是结构体变量;
将结构体成员赋值后传给初始化函数NVIC_Init(NVIC_InitTypeDef* NVIC_InitStruct);
初始化如下:
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //子优先级3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器
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