void MyUSART_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;
    NVIC_InitTypeDef   NVIC_InitStructure;

    //CLOCK
  /* Enable GPIO clock */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC | RCC_AHBPeriph_GPIOE, ENABLE);

  /* Enable USART clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
   

  /* Connect PXx to USARTx_Tx */
  GPIO_PinAFConfig(GPIOC, GPIO_PinSource4, GPIO_AF_7);

  /* Connect PXx to USARTx_Rx */
  GPIO_PinAFConfig(GPIOE, GPIO_PinSource1, GPIO_AF_7);
 
    //GPIO
  /* Configure USART Tx as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
  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(GPIOC, &GPIO_InitStructure);
   
  /* Configure USART Rx as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
  GPIO_Init(GPIOC, &GPIO_InitStructure);
   
   
    //USART
    /* USART configuration */
    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;

  /* USART configuration */
  USART_Init(USART1, &USART_InitStructure);
    /* USART IT configuration */
    //USART_ITConfig(USART1, USART_IT_TXE, ENABLE);
    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
   
  /* Enable USART */
  USART_Cmd(USART1, ENABLE);
}