USART1 and dynamic graph

Hi, I want to receive 20 bytes.

I want to receive them every 2 milliseconds and simultaneously.

To show data, I am working with TOUCHGFX. I use dynamic graphs to show them.

The problem is, I want to show 12 bits on each graph.

I debugged my code , it seams I don't loose data.

but my graph is not fed correctly.

I have 2 signs in my data packets, first is 240 and last is 180.

here is the code:

  void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart){

   if(Sign[0]==240){

   HAL_UART_Receive(&huart1,(uint8_t*)RxBuf,19,100);

    FlagFinsh=1;

   HAL_UART_Receive_IT(&huart1,(uint8_t*)Sign,1);

   }else {

   HAL_UART_Receive_IT(&huart1,(uint8_t*)Sign,1);

  HAL_GPIO_TogglePin(RED_GPIO_Port, RED_Pin);

   }

  }

and in my touchgfx screen in handletickevent function , I just extern and add data to graph:

  void Screen2View::handleTickEvent()

{

  tickCounter++; 

if(FlagFinsh==1){

FlagFinsh=0;

if(++i > 120) i=0;

     Data= (((RxBuf[3] >> 4)*256)+RxBuf[1])- 1700;

dynamicGraph1.addDataPoint(Data);

  }

Thanks.