title: Transmit complete call back not getting called in UART DMA
body: <p>What I'm trying to do is fairly simple. Transmit through DMA and wait till it gets transmitted. And then receive and wait till it is received.</p>
  
  <p>When I comment out the receive part(including the call back), it is going into the transmit complete call back function. But when I un-comment the receive portion, it is not going into the tx cplt call back and it is directly going into the receive cplt callback. And when I check the receive buffer I'm not getting what I expected(obviously). What could have gone wrong?</p>
  
  <p>I'm using Atollic True Studio V 9.0 , CubeMx v5.1.0, STM32F407VG-DISC1 board and enabled DMA for UART2.</p>
  
  <p>I've tried sending char buffer through UART DMA and receive it. It seems it is not transmitting at all as it is not going into txCplt call back. And it is directly going into Rxcplt call back. </p>
  
  <pre><code>uint8_t tx_arr[10], rx_arr[10];
  __IO ITStatus UartReady = RESET;
  
  int main(void)
  {
    int i = 0;
    for(i = 0; i&lt;10; i++)
        rx_arr[i] = 0;
  
    for(i = 0; i&lt;10; i++)
  tx_arr[i] = i*2;
  
   HAL_Init();
   SystemClock_Config();
   MX_GPIO_Init();
   MX_DMA_Init();
   MX_USART6_UART_Init();
   MX_USART2_UART_Init();
  
    while (1)
    {
  
    if( HAL_UART_Transmit_DMA(&amp;huart2, (uint8_t*)tx_arr, 10)!= HAL_OK )
    {
        Error_Handler();
    }
        while(UartReady != SET)
        {
  
    }
    UartReady  = RESET;
        if( HAL_UART_Receive_DMA(&amp;huart2, (uint8_t*)rx_arr, 10)!= HAL_OK )
   {
      Error_Handler();
   }
       while(UartReady != SET)
   {
  
   }
   UartReady  = RESET;
  
  
  }
  
  }
  
  void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart)
  {
      UartReady = SET;
  }
  
  void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
  {
      UartReady = SET;
  }
  </code></pre>
  
  <p>I expect the rx_arr will get filled by 0,2,4,6,...18 but it is getting filled with junk</p>