How to Increase/Decrease Graph plotting speed in TouchGFX Dynamic Graph?

[SMour.2]

Hi,

I'm using STM32F746 MCU on my custom Board. My application uses TouchGFX Dynamic Graph widget on a 480x272 capacitive touch display.

I want to know is it possible to change the Number of Data Points in runtime of the application?

If the above method is not possible then How can I Increase or Decrease the Graph Plotting speed in application Run Time? I want that user can change the graph plotting speed in the application.

For Eg. Suppose My ADC sampling rate is 500 Samples per second. I want to show 5 seconds or 10 seconds of ADC data on the display from start pixel to end pixel.

[SMour.2]

Can Somebody Help me with this?

[MM..1]

Try read Dynamic Graph | TouchGFX Documentation part Data points, and ...

[SMour.2]

I read the Dynamic Graph | TouchGFX Documentation  , but couldn't find any way to change the number of data points during run time. There is not inbuilt function in touchgfx to change Datapoints during run time.

[MM..1]

What is displayed is controlled with

xxgraph.setGraphRangeX(0,200);

but your 10s samples is 5000 samples and your display is 480 then ?

Capacity maybe can be changed as renew instance object , but isnt necesary, simply set capacity to max you need and switch only visible area...

For example capacity 1000 and view 200, add dummy 201-999 sample...

[SMour.2]

Hi,MM..1,

Thanks for your reply, But this Does not help me with changing graph speed. It is only showing the the values till the graph range is set. For eg, I set the number of data points to 1000, and view 480 points, it takes further time to process values from 481-1000(though they are not visible Of course). So basically there is a pause (of processing points 481-1000) before the graph restarts from 0th pixel.

I guess I have to take multiple dynamic graphs with different number of data points, Then I will make the dynamic graph visible which I want to show and make others invisible.

I Show 5000 or 2500 or 1250 samples in 480 pixels or whatever pixels you have, traditionally by using drawline. You have to adjust the x-value between two points.

Also I want to ask If I use X-Axis Label in 480 pixels and make interval of 48 , I'm getting 10 labels as multiples of 48(49,96,144.....). But how to change to format like 00:00:01. i.e 48 should correspond to 00:00:01 then 96 to 00:00:02 ......... goes on.

[MM..1]

Try my test code and maybe you understand how is speed defined and based on screen refresh ticks my graph have capacity 44

void Screen1View::setupScreen()
{
    Screen1ViewBase::setupScreen();
 
    dynamicGraph1.setGraphRangeX(0, 22);
}
 
void Screen1View::tearDownScreen()
{
    Screen1ViewBase::tearDownScreen();
}
 
void Screen1View::handleTickEvent()
{
    tickCounter++;
 
    if (tickCounter > 600)
    	return;               //stop
 
    
    if (tickCounter % 100 == 0)
    	dynamicGraph1.setGraphRangeX(0, 22);
    if (tickCounter % 200 == 0)
    	dynamicGraph1.setGraphRangeX(0, 50);
    {
      // Insert data point
      dynamicGraph1.addDataPoint(25*(tickCounter%4));
      dynamicGraph1.addDataPoint(4+25*(tickCounter%4));
      dynamicGraph1.addDataPoint(8+25*(tickCounter%4));
    }
}

[SMour.2]

Hi MM1,

I couldn't try your solution as I figured one myself by using multiple dynamic graphs. I'm in a hurry with my application . But will try your idea soon.

[Pratham123]

Did you find any solution?