STM32F2XX里串口2无法发出数据

gq029 · 发表于 2017-6-12 11:58:23

串口2接PD5和PD6，配置代码如下。为题：发送中断可以进，但没有数据发出去。
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);
GPIO_PinAFConfig(GPIOD,GPIO_PinSource5,GPIO_AF_USART2);
GPIO_PinAFConfig(GPIOD,GPIO_PinSource6,GPIO_AF_USART2);

GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Pin = GPIO_PinSource5;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOD, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Pin = GPIO_PinSource6;
GPIO_Init(GPIOD, &GPIO_InitStructure);

uart.USART_WordLength = USART_WordLength_8b;
uart.USART_StopBits = USART_StopBits_1;
uart.USART_Parity = USART_Parity_No;
uart.USART_Mode = (USART_Mode_Rx | USART_Mode_Tx);
uart.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
uart.USART_BaudRate = 230400;
      USART_Init(USART2, &uart);

      /* Configure the NVIC Preemption Priority Bits */
      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

      /* Enable the USARTy Interrupt */
      NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);

      /* Enable USART1 */
      USART_Cmd(USART2, ENABLE);
      USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
      USART_ITConfig(USART2, USART_IT_TC, ENABLE);