NVIC_InitTypeDef NVIC_InitStructure;

/* Configure the NVIC Preemption Priority Bits */

/* Configure one bit for preemption priority */

/*優(yōu)先級(jí)組說(shuō)明了搶占優(yōu)先級(jí)所用的位數(shù)，和子優(yōu)先級(jí)所用的位數(shù)在這里是1，7 */

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

/* Enable the USART1 Interrupt */

NVIC_InitStructure.NVIC_IRQChannel = UART5_IRQn; //設(shè)置串口5中斷

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //搶占優(yōu)先級(jí)0

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //子優(yōu)先級(jí)為0

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能

NVIC_Init(&NVIC_InitStructure);

其中IRQChannel在stm32f2xx.h中查找。UART5_IRQn為UART5中斷通道。