Stm32f030 双串口

void USART_INIT(void)
{
            GPIO_InitTypeDef  GPIO_InitStructure;
            USART_InitTypeDef USART_InitStructure;
            NVIC_InitTypeDef         NVIC_InitStructure;
    
            NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
            NVIC_InitStructure.NVIC_IRQChannelPriority = 2;
            NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
            NVIC_Init(&NVIC_InitStructure);
    
            GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_1);
            GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_1);
            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9|GPIO_Pin_10;
            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
            GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
            GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
            GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
            GPIO_Init(GPIOA, &GPIO_InitStructure);
    
            RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE );        
            USART_InitStructure.USART_BaudRate = 115200;
            USART_InitStructure.USART_WordLength = USART_WordLength_8b;
            USART_InitStructure.USART_StopBits = USART_StopBits_1;
            USART_InitStructure.USART_Parity = USART_Parity_No;
            USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
            USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
            USART_Init(USART1, &USART_InitStructure);
            USART_Cmd(USART1, ENABLE);

}

void USART2_INIT(void)
{
            GPIO_InitTypeDef GPIO_InitStructure;
            USART_InitTypeDef USART_InitStructure;
            NVIC_InitTypeDef         NVIC_InitStructure;
    
            NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
            NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
            NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
            NVIC_Init(&NVIC_InitStructure);
    
            GPIO_PinAFConfig(GPIOA,GPIO_PinSource2,GPIO_AF_1);
            GPIO_PinAFConfig(GPIOA,GPIO_PinSource3,GPIO_AF_1);
            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3;
            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
            GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
            GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
            GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
            GPIO_Init(GPIOA, &GPIO_InitStructure);
    
            RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE );        
            USART_InitStructure.USART_BaudRate = 115200;
            USART_InitStructure.USART_WordLength = USART_WordLength_8b;
            USART_InitStructure.USART_StopBits = USART_StopBits_1;
            USART_InitStructure.USART_Parity = USART_Parity_No;
            USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
            USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
            USART_Init(USART2, &USART_InitStructure);
            USART_Cmd(USART2, ENABLE);

}

in main(void)
{
    USART_INIT();
    USART2_INIT();
    Delay(25000);
    USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
    
    USART_ITConfig(USART2,USART_IT_RXNE,ENABLE);

}