I port Touch_Calibration sample with keil's RTX in my board and find the problem described above,so i rewrite the Touch_Calibration sample in the emwin simulator with multitasking.

The problem is that one task initialize its Background and font colors,and they change if the task schedules out and

The attach file can demonstrate the problem and also be solved with adding a few code: add GUI_Clear(); after GUI_Init(); in the entry function MainTask.

GUI_pContext and _CurrentTaskNo import the bug.
Here GUITASK_SetMaxTask(n) in GUICONF.c, n must be lager than 2 in this sample however only 2 GUI_Context will be used because of debug assert.
GUI_pContext will be valid after GUI_Init() however it becomes useless in multitasking because no task can use it.

Hello

Keil's emwin lib is compiled with multitasking in default, stemwin seperate into 2 aspects. i do not have the wrong choice

you can do some improvement in that issue and others would not fall down at the same place twice. :)


Best regards,
myxiaonia

Hello Adrian

stemwin contains 2 libs differentiating with postfix -OS

I port the official sample Touch_Calibtrate to my board ,it works well. After that i just want to watch the physical touch positon so i add GUI_DISP in the touch thread,then i found the issue.
i rewrite the sample and port it to simulator and the issue is still here.

you can add the attch file to the simulator with EMWIN524 and see that.
If i add a GUI_Clear routine in the MainTask, it seems to be right... Here GUI_Clear can be replaced with GUI_LOCK(); GUI_UNLOCK();
i am confused why it do So ???


Best regards,
myxiaonia


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Hello Adrian


If emwin is compatible with os, GUI_Init must be called in a task/thread because some os-dependent routines.
GUI_pContext should point to one of the GUI_Context contained in _pSaved but not.
GUI_Init calls GUITASK_CopyContext pretending it is independent of any tasks.




Best regards,
myxiaonia

Hello Adrian



This issue also occurs in the simulator




Best regards,
myxiaonia

Hello Adrian


The attach file is. Simply replace the same name file(change file type .txt -> .c) in the emwin simulator and build it , you will see the situation.


Best regards,
myxiaonia

Hello Adrian

I resend the file, please check it. Thanks in advanced.

Best regards,
myxiaonia

Hello Adrian

Here are 2 jpg files, 1.jpg is for GUI_Clear commented and 2.jpg is for GUI_Clear uncommented in function MainTask();
They are different.

Best regards,
myxiaonia

Hello Adrian

This bug is all about multiple tasks support, you can watch the variable GUI_pContext in task Task_0 even differs.

Best regards,
myxiaonia

Hello Adrian

I put 2 breakpoints in the sample and print screen. How to explain this ?



Best regards,
myxiaonia

Hello Adrian

Excuse me for the improper sample. emwin api uses GUI_LOCK() to ensure its own GUI_Context, so the sample above is not credible.

Here is a new test considering this situation.


Best regards,
myxiaonia