STM32使用3个串口中断和1个外部中断的问题

2019-08-10 15:50发布

使用USART1发送，USART2接收，USART3发送和接收，另外使用PE2作为外部中断线。
在NVIC_Configuration（）中当注释钓USART3的设置时，程序运行都正常。但是不注释的时候，USART1的发送就没有了，很奇怪，哪个高人给分析分析。
void NVIC_Configuration(void)
{
NVIC_InitTypeDef  NVIC_InitStructure;

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
//USART1
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

//USART2
NVIC_InitStructure.NVIC_IRQChannel    = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority    = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd    = ENABLE;
NVIC_Init(&NVIC_InitStructure);

//USART3
  NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority= 3;
NVIC_InitStructure.NVIC_IRQChannelSubPriority    = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd    = ENABLE;
NVIC_Init(&NVIC_InitStructure);

//Int2

PS
NVIC_InitStructure.NVIC_IRQChannel    = EXTI2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority    = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd    = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}