关于串口不通的问题

jianwenchang

原子大侠好,我按您的串口实验改的代码如下:
void uart2_init(u32 bound)
{
    //GPIO端口设置
    GPIO_InitTypeDef GPIO_InitStructure;
 USART_InitTypeDef USART_InitStructure;
 NVIC_InitTypeDef NVIC_InitStructure;
 
 RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2|RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO, ENABLE);
     //USART2_TX   PA.2
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
  
    //USART2_RX   PA.3
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStructure); 

   //Usart2 NVIC 配置

    NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0 ;
 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  //

 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USART2
  
 USART_InitStructure.USART_BaudRate = bound;//一般设置为9600;
 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(USART2, &USART_InitStructure);
  
    USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//开启中断
  
    USART_Cmd(USART2, ENABLE);                    //使能串口 
// USART_ClearFlag(USART1, USART_FLAG_TC);
}
您用的是串口1,为什么我改成串口2就通不了呢?请大侠哥给予解释,谢谢!@

正点原子

我不用库.
串口2/3的初始化本论坛早有了,你搜索一下,参考下.