（求助）stm32中用USART_IT_IDLE中断接收Sbus信号只能接收帧头

村头二狗子 · 发表于 2017-9-23 14:00:16

void uart2_init(u32 bound){
  //GPIO端口设置
  GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);       //使能gpio A
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);       // 使能USART2
//RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2|RCC_APB2Periph_GPIOA, ENABLE); //使能USART2，GPIOA时钟

//USART1_TX GPIOA.2
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //PA.2             //引脚配置
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;          //
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
  GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.2
  //USART1_RX    GPIOA.3初始化
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;//PA.3
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
  GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.3

  //Usart1 NVIC 配置                优先级配置
  NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1 ;//抢占优先级3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;       //子优先级3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;          //IRQ通道使能
NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器

//USART 初始化设置

USART_InitStructure.USART_BaudRate = bound;//串口波特率
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
USART_InitStructure.USART_StopBits = USART_StopBits_1;//1个停止位
USART_InitStructure.USART_Parity =  USART_Parity_No;//无校验位
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式

  USART_Init(USART2, &USART_InitStructure); //初始化串口2

   USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//开启串口接受中断
  USART_ITConfig(USART2, USART_IT_IDLE, ENABLE);//开启串口接受中断       USART_IT_IDLE 串口总线中断
//USART_ITConfig(USART2, USART_IT_TXE, ENABLE); //开启发送中断    (不要开启，占中断！！！！)
  USART_Cmd(USART2, ENABLE);                   //使能串口2
}
if(USART_GetITStatus(USART2, USART_IT_IDLE) != RESET)  //接收中断
      {
                                             for(j=0;j<25;j++)
                                             {
                                                         Sbus1_TO_SEND[j]  =USART_ReceiveData(USART2);
                                             }


                                          for(State=0;State<25;State++)
                                             {
                                                                  USART_SendData(USART3,Sbus1_TO_SEND[State]);
                                             }
   }