Redrawing using STemWin 2D graphics API on STM32L4R9I Discovery

[Johan Bergman]

I'm running the STM32L4R9I STemWin HelloWorld demo, which basically renders some content to the screen, and then proceeds to an infinite loop, like this:

GUI_SetBkColor(GUI_BLACK);
GUI_Clear();
GUI_SetFont(GUI_FONT_24B_1);
GUI_DispStringHCenterAt("Hello world!", LCD_GetXSize() / 2, (LCD_GetYSize() - 16) / 2);
 
while (1)  {
  LCD_WaitForDisplayCompletion();
 
  GUI_Exec();
  LCD_ActiveRegion = 1;
 
  LCD_WaitForDisplayCompletion();
}

I would like to keep clearing and updating the screen at preferably 30hz, but simply placing the draw instructions inside the while loop casues a lot of flicker and is not consistent at all.

I would really appreciate some insight on this!

Regards,

Johan

[Vitaliy Chernobay]

You can try use of FREERTOS

Add

osDelay(10)

after

GUI_Exec();

[Johan Bergman]

Hi!

Sadly I'm not using any RTOS, since it is not required for my project. I don't really need the Window Manager of STemWin either, and I'm not sure if I'm currently using it or not.