诶，USART1用得可以接收，把USART1换成2就不行了！所有的USART1都换了怎么办啊？还是没用。程序在下面请大神抽出点时间帮忙看看

ericzha · 发表于 2017-1-20 01:20:05

void My_USART2_Init(void)
{
GPIO_InitTypeDef GPIO_InitStrue;
USART_InitTypeDef USART_InitStrue;
NVIC_InitTypeDef NVIC_InitStrue;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);

GPIO_InitStrue.GPIO_Mode=GPIO_Mode_AF_PP;
GPIO_InitStrue.GPIO_Pin=GPIO_Pin_2;
GPIO_InitStrue.GPIO_Speed=GPIO_Speed_10MHz;
      GPIO_Init(GPIOA,&GPIO_InitStrue);

GPIO_InitStrue.GPIO_Mode=GPIO_Mode_IN_FLOATING;
GPIO_InitStrue.GPIO_Pin=GPIO_Pin_3;
GPIO_InitStrue.GPIO_Speed=GPIO_Speed_10MHz;
      GPIO_Init(GPIOA,&GPIO_InitStrue);

USART_InitStrue.USART_BaudRate=115200;
USART_InitStrue.USART_HardwareFlowControl=USART_HardwareFlowControl_None;
USART_InitStrue.USART_Mode=USART_Mode_Tx|USART_Mode_Rx;
USART_InitStrue.USART_Parity=USART_Parity_No;
USART_InitStrue.USART_StopBits=USART_StopBits_1;
USART_InitStrue.USART_WordLength=USART_WordLength_8b;

USART_Init(USART2,&USART_InitStrue);

USART_Cmd(USART2,ENABLE);//ê1Äü′®¿ú1

USART_ITConfig(USART2,USART_IT_RXNE,ENABLE);//¿aÆô½óêÕÖD¶Ï

NVIC_InitStrue.NVIC_IRQChannel=USART2_IRQn;
NVIC_InitStrue.NVIC_IRQChannelCmd=ENABLE;
NVIC_InitStrue.NVIC_IRQChannelPreemptionPriority=1;
NVIC_InitStrue.NVIC_IRQChannelSubPriority=1;
NVIC_Init(&NVIC_InitStrue);

}

void USART2_IRQHandler(void)
{
u8 res;
if(USART_GetITStatus(USART2,USART_IT_RXNE))
{
   res= USART_ReceiveData(USART2);
   USART_SendData(USART2,res);
  }
}

int main(void)
{
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
My_USART2_Init();
   while(1);

}