STM32程序问题，大家帮忙看下谢谢

只看该作者 · 2012-7-28 16:24

int main(void)
{
// 配置串口参数
  /* USARTx configured as follow:
      - BaudRate = 115200 baud
      - Word Length = 8 Bits
      - One Stop Bit
      - No parity
      - Hardware flow control disabled (RTS and CTS signals)
      - Receive and transmit enabled
  */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB, ENABLE); /*使能LED灯使用的GPIO时钟*/
  USART_InitStructure.USART_BaudRate = 115200;
  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;
  STM_EVAL_COMInit(COM1, &USART_InitStructure);
  /* Output a message on Hyperterminal using printf function */
  LED_config();
  InterruptConfig();             /*设置中断向量起始地址*/
  SysTick_Configuration();    /*SysTick配置*/
  /* Main loop */
  while (1)
  {
  GPIO_setBit_PD6
  Delay(20000);
  GPIO_resetBit_PD6
  Delay(20000);
  printf("\n\rUSART Printf Example: retarget the C library printf function to the USART\n\r");
  }
}

为什么不能收到串口数据，也不能进行系统滴答实验？串口有占用了系统滴答吗？