{

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA |
RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);
}

首先中断的配置

void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;

#ifdefVECT_TAB_RAM

NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else

NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}

接着设置GPIO的第二功能

void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);

}

初始化串口

void USART_Configuration(void)
{
USART_InitTypeDef USART_InitStructure;
USART_ClockInitTypeDefUSART_ClockInitStructure;



#if 1
USART_ClockInitStructure.USART_Clock = USART_Clock_Disable;
USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;
USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;

USART_ClockInit(USART1, &USART_ClockInitStructure);
#endif
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_ITConfig(USART1, USART_IT_RXNE, ENABLE);


USART_Cmd(USART1, ENABLE);

}

然后是中断处理函数，这里只实现了简单的将收到的字符回显到终端上

void USART1_IRQHandler(void)
{
u16 i;

if(USART_GetFlagStatus(USART1,USART_IT_RXNE)==SET)
{
i = USART_ReceiveData(USART1);
USART_SendData(USART1,i);
while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET)
{
}
}

if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{

USART_ClearITPendingBit(USART1, USART_IT_RXNE);

}

}