Flickering while Updating the data On TFT Display

Question

Hi All, 
 Here i am using a TFT display for RZ/A1H, Here we are using Guiliani developed a GUI . The data whatever received from CAN has to display on the screen and it is working fine, But while on each update the screen is flickering especially if any animation or text update happen, please suggest a solution to avoid the flickering. Also please suggest the reason and rootcause for the above

GuilianiSupport · Accepted Answer

Hello, 
 when not using a Datapool-element, how is the value coming from CAN updated inside the GUI? is there any special logic which accesses the GUI-element and changes the value? 
 In general when values from outside of the Guiliani-application (e.g. other tasks or peripherals) should update GUI-elements it is strongly advised to use Datapool-elements and define the GUI-element as an observer. This Datapool-element can be modified from outside of Guiliani in a thread-safe way. The update of the GUI-element is automatically done by Guiliani in the next iteration of the main-loop. 
 To investigate the flickering more you can set breakpoints inside the function "GrpDrv_SetFrameBuffer" in the file <Application>/Common/Source/FreeRTOS/StreamRuntime_GraphicRZA.cpp. In this function a call to "R_RVAPI_GraphChangeSurfaceVDC" is done which will effectively change the framebuffer which is currently displayed. 
 Best Regards, 
 Guiliani Support