串口接收中断一直进不去，但是可以printf发送数据

只看该作者 · 2024-9-21 17:23

void usart_init(u32 buad)
{

   USART_InitType USART_InitStructure;
   GPIO_InitType GPIO_InitStructure;
   NVIC_InitType NVIC_InitStructure;
   RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_GPIOA|RCC_APB2_PERIPH_AFIO,ENABLE);
   RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_USART1,ENABLE);
      /* Configure USARTx Tx as alternate function push-pull */
GPIO_InitStructure.Pin       = GPIO_PIN_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF_PP;
GPIO_InitPeripheral(GPIOA, &GPIO_InitStructure);

/* Configure USARTx Rx as input floating */
GPIO_InitStructure.Pin    = GPIO_PIN_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitPeripheral(GPIOA, &GPIO_InitStructure);

   NVIC_InitStructure.NVIC_IRQChannel          = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;
NVIC_InitStructure.NVIC_IRQChannelCmd       = ENABLE;
NVIC_Init(&NVIC_InitStructure);

   USART_InitStructure.BaudRate          = buad;
USART_InitStructure.WordLength       = USART_WL_8B;
USART_InitStructure.StopBits          = USART_STPB_1;
USART_InitStructure.Parity             = USART_PE_NO;
USART_InitStructure.HardwareFlowControl = USART_HFCTRL_NONE;
USART_InitStructure.Mode             = USART_MODE_RX | USART_MODE_TX;

/* Configure USARTx */
USART_Init(USART1, &USART_InitStructure);
USART_ConfigInt(USART1, USART_INT_RXDNE, ENABLE);
/* Enable the USARTx */
USART_Enable(USART1, ENABLE);
}

void USART1_IRQHandler(void)             //串口1中断服务程序
{
u8 Res;
if(USART_GetIntStatus(USART1, USART_INT_RXDNE) != RESET)  //接收中断(接收到的数据必须是0x0d 0x0a结尾)
{
Res =USART_ReceiveData(USART1); //读取接收到的数据

if((USART_RX_STA&0x8000)==0)//接收未完成
{
if(USART_RX_STA&0x4000)//接收到了0x0d
{
if(Res!=0x0a)USART_RX_STA=0;//接收错误,重新开始
else USART_RX_STA|=0x8000; //接收完成了
}
else //还没收到0X0D
{
if(Res==0x0d)USART_RX_STA|=0x4000;
else
{
USART_RX_BUF[USART_RX_STA&0X3FFF]=Res ;
USART_RX_STA++;
if(USART_RX_STA>(USART_REC_LEN-1))USART_RX_STA=0;//接收数据错误,重新开始接收
}
}
}

   }
}