请教STM32F107串口问题

只看该作者 · 2016-3-22 17:52

请教各位一下，串口发数据在PC机上接收的数据有误，觉得是波特率的问题，可也找不出个原因了，请赐教！多谢
void Usart5_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  USART_InitTypeDef USART_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;
  RCC_APB1PeriphClockCmd(RCC_APB2Periph_GPIOD|RCC_APB2Periph_GPIOC|RCC_APB2Periph_AFIO, ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART5,ENABLE);
  //USART5_TX PC.12
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOC, &GPIO_InitStructure);

  //USART5_RX    PD.2
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOD, &GPIO_InitStructure);

  //Usart1 NVIC 配置
  NVIC_InitStructure.NVIC_IRQChannel = UART5_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2 ;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
  NVIC_Init(&NVIC_InitStructure); //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器USART1
  //USART 初始化设置

  USART_InitStructure.USART_BaudRate = 9600;//波特率
  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(UART5, &USART_InitStructure);

  USART_ITConfig(UART5, USART_IT_RXNE, ENABLE);//开启中断

  USART_Cmd(UART5, ENABLE);                   //使能串口
}

在主程序中发隔一秒发UART5->DR =0xaa;
接收时就不正确，