Graph is not displaying correctly

[nsabo.1]

Receiving data by UART and display it by TOUCHGFX cause some lost data in my screen, graph is not displayed correctly.

There are 2 boards one which is been receiving the signals by sensors and the second one is LCD board which has been configured by TOUCHGFX.

I want to receive data by UART from the first board and show them in LCD.

But some graph is not shown correctly.

Here is the code:

```

HAL_UART_Receive_IT(&huart1,(uint8_t*)RxBuf,20);

HAL_UART_RxCpltCallback(&huart1);

   HAL_Delay(1);

```

I put ```HAL_Delay(1); ``` in order to receive data correctly but it does not make sense.

And the data shown by graph:

```

   if(i<123){

dynamicGraph1.addDataPoint(RxBuf[1]+25);

}else

i=0;

```

Note : in image, the first graph is displaying by UART and as you see suddenly a drop appears... and I don't know how to solve it, and the second graph (from above) is the correct signal.

How can I solve it?

Thanks again.

[nsabo.1]

@Community member​ 

I got those dropped straight lines . I don't know what the problem is

[Karl Yamashita]

You need to copy and paste your code exactly how you've written it as i have asked in the other post. I'm not sure why you've started a new post? You've pasted the same question.

Then there is this problem below

HAL_UART_Receive_IT(&huart1,(uint8_t*)RxBuf,20);
 
HAL_UART_RxCpltCallback(&huart1); // This is wrong, you don't make this call, the HAL driver does.
 
   HAL_Delay(1);

And where is this code at? It has to be in some function.

  if(i<123){
 
dynamicGraph1.addDataPoint(RxBuf[1]+25);
 
}else
 
i=0;

what code do you have in HAL_UART_RxCpltCallback?

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{ 
	// show your code 
}

[nsabo.1]

@Community member​ 

Hi, Karl. sorry for my bad English.

1. void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
2. {
3. // show your code
4. }

Karl where should I use this function?

you mean I put the add data point in UartCALLBACK?

[nsabo.1]

I just call this function... I can't use void in a class ...

[Karl Yamashita]

Maybe my YouTube video will help you understand how to receive UART data

https://youtu.be/bCppZf8FKYg

[nsabo.1]

Thanks