F407串口3不能使用

chuanjiejay · 发表于 2018-3-8 10:37:15

本帖最后由 chuanjiejay 于 2018-3-8 10:46 编辑

刚开始用F407 ，用串口连接外设，串口1和串口6都能正常使用，但是串口3不能使用，不能发数据也不能收数据，不知道怎么回事，那位大神帮帮忙瞅瞅。用的是Pin 69 和Pin70 PB10和PB11void uart3_init(u32 bound)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      USART_InitTypeDef USART_InitStructure;
      NVIC_InitTypeDef NVIC_InitStructure;

      RCC_APB2PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);
      RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB,ENABLE);


      GPIO_PinAFConfig(GPIOB,GPIO_PinSource10,GPIO_AF_USART3);
      GPIO_PinAFConfig(GPIOB,GPIO_PinSource11,GPIO_AF_USART3);

      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
      GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
      GPIO_Init(GPIOB,&GPIO_InitStructure);

      USART_InitStructure.USART_BaudRate = bound;
      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(USART3, &USART_InitStructure);

      USART_Cmd(USART3, ENABLE);

      USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);

      NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority =1;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);
}