Thursday, April 19th 2018, 3:52pm UTC+2

You are not logged in.

  • Login
  • Register

Question about restarting GUI in multi-task system

Dear visitor, welcome to SEGGER Forum. If this is your first visit here, please read the Help. It explains how this page works. You must be registered before you can use all the page's features. Please use the registration form, to register here or read more information about the registration process. If you are already registered, please login here.

kenmux

Beginner

Date of registration: Jan 18th 2016

Posts: 50

1

Friday, January 5th 2018, 2:38pm

Question about restarting GUI in multi-task system

Hello,

In my project, there's a requirement for restarting GUI.

My debugging code as follows:

1) In the main UI task:

C/C++ Source code

 
1
2
3
4
5
6
7
8
9
10
11
12
13

  // Exit task
  EXIT :
#if (GUI_X_SINGLE_TASK == 0)
  GUI_X_Task_Delete();  //Delete background GUI task
#endif
  GUI_Exit();
  vTaskDelay(10);
  GUI_Init();
  WM_SelectWindow(WM_GetDesktopWindowEx(0));
  GUI_DrawBitmap(UI_ImageTable[IMG_SPLASH_1_INDEX], 0, 0);
  GUI_Delay(500);
  UI_NotifyFTTask(TASK_EVENT_MISC_RETURN_TO_FT);  //Ask test UI task to continue
  vTaskDelete(NULL);


2) In the test UI task

C/C++ Source code

 
1
2
3
4
5
6
7

	// Clear Key Message Buffer before starting UI
	START : GUI_ClearKeyBuffer();

	// Start UI
	DEBUG_MSG("FT\r\n");
	UI_EnterFTMenu(WM_HBKWIN);
	vTaskDelay(50);


3) Background task:

C/C++ Source code

 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

#if (GUI_X_SINGLE_TASK == 0)
/*******************************************************************
*
*       _GUI_Task
*
* This task does the background processing.
* The MainTask job is to update invalid windows, but other things such as
* evaluating mouse or touch input may also be done.
*/
static void _GUI_Task( void *pvParameters ) {
  (void)pvParameters;
  DEBUG_MSG ("<I> _GUI_Task Up\r\n");

  while (1) {
    /* Do the background work */
    GUI_Exec();
    GUI_X_ExecIdle();
  }
}
#endif


4) GUI Init custom code:

C/C++ Source code

 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17

/*********************************************************************
*
*      GUI_X_Init()
*
* Note:
*   This routine is called from GUI_Init() in any case whether there
*   is an RTOS or not. You can use it for additional initializations
*   needed.
*/

void GUI_X_Init(void) {
#if (GUI_X_SINGLE_TASK == 0)
  BaseType_t result = xTaskCreate(_GUI_Task, "XBKG", configUI_BKG_TASK_STACK_SIZE,
                                  NULL, mainQUEUE_UI_BG_TASK_PRIORITY, &_pGUITask);
  if (result != pdPASS) for (;;) ;
#endif
}


It's all okay if I don't use the background task (GUI_X_SINGLE_TASK == 1).
But, the codes always stop at calling the first "GUI_XXX" function in the test UI task when using background task.

So, my question is:
Is deleting background task is the only work to do during restarting GUI?
Am I missing something crucial else?

emWin Version: v5.44b
Also, I use the FreeRTOS.

Any idea or advice? Thanks.

Kenmux

This post has been edited 1 times, last edit by "kenmux" (Jan 5th 2018, 2:42pm)

SEGGER - Schoenen

Super Moderator

Date of registration: Aug 13th 2015

Posts: 558

2

Monday, January 8th 2018, 2:34pm

Hi,

Is the define GUI_OS set to 1 in GUIConf.h?

Did you implemented the functions GUI_X_InitOS(), GUI_X_Unlock(), GUI_X_Lock(), GUI_X_GetTaskId() properly?

Where exactly does it crash (check how far you get when stepping into the code)?

Is the test UI task still running after GUI_Exit()?
I think it should also be terminated because it's calling GUI functions.

Also, we recommend to call GUI_Exec() from only one task (GUI_Exec() gets called indirectly from GUI_Delay()).

Regards
Sven

kenmux

Beginner

Date of registration: Jan 18th 2016

Posts: 50

3

Monday, January 8th 2018, 3:17pm

Hello Sven,

Thanks for your reply!

I checked carefully with the code, and did some modifications:

1) In the main UI task, calling GUI_Exec() before calling GUI_Exit():

C/C++ Source code

 
1
2
3
4
5
6
7
8
9
10
11

  // Exit task
  EXIT : GUI_Exec();
  GUI_X_Exit();
  GUI_Exit();
  vTaskDelay(10);
  GUI_Init();
  WM_SelectWindow(WM_GetDesktopWindowEx(0));
  GUI_DrawBitmap(UI_ImageTable[IMG_SPLASH_1_INDEX], 0, 0);
  GUI_Delay(500);
  UI_NotifyFTTask(TASK_EVENT_MISC_RETURN_TO_FT);
  vTaskDelete(NULL);


2) To make sure all resources released, I added this function:

C/C++ Source code

 
1
2
3
4
5
6
7
8
9
10
11
12

void GUI_X_Exit(void) {
#if (GUI_X_SINGLE_TASK == 0)
  if (_pGUITask) {
    vTaskDelete(_pGUITask);
    _pGUITask = NULL;
  }
#endif
  if (_Semaphore) {
    vSemaphoreDelete(_Semaphore);
    _Semaphore = NULL;
  }
}


Then it worked perfectly.
Yes you are right! There should be ONLY ONE task to call GUI_Exec()...
I'll look into the code to make sure it!

Best regards,
Kenmux

This post has been edited 5 times, last edit by "kenmux" (Jan 8th 2018, 3:31pm)

Similar threads