How to use a Button, created by the GUI-Builder

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  • How to use a Button, created by the GUI-Builder

    Hey everyone,

    Since a few days I am working with the STM32F746G-Discovery Board from ST.

    For my application, I would like to use the GUI Builder and create some Windows
    with Buttons and Images.

    I successfully implemented the GUI library from ST and created a nice starting
    screen with only one button.

    The problem is, I am struggling with the handling of touch events.

    The only thing I changed so far is, that inside of the WindowDLG.c file
    (created by the GUI Builder) I added one line of code.



    C Source Code

    1. case
    2. WM_NOTIFICATION_RELEASED:
    3. //USER START (Optionally insert code for reacting on notification message)
    4. switch (Id) {
    5. case ID_BUTTON_0:
    6. WINDOW_SetBkColor(pMsg->hWin, GUI_BLUE); //<------------------------------------------
    8. break;
    10. }




    When I start the GUI and press the Button, nothing happens...
    Inside of my main.c I initialize the Touch Screen like this:


    C Source Code

    1. static void BSP_Config(void) {
    3. /* Initializes the SDRAM device */
    5. BSP_SDRAM_Init();
    7. /* Initialize the Touch screen */
    9. BSP_TS_Init(480, 272);
    11. /* Enable the CRC Module */
    13. __CRC_CLK_ENABLE()
    15. ;
    17. }
    Display All




    In addition to that, I call the following function every 50ms:


    C Source Code

    1. void BSP_Pointer_Update(void) {
    3. uint8_t text[20] = "Hello World!\n\r";
    5. GUI_PID_STATE TS_State;
    7. static TS_StateTypeDef prev_state;
    9. TS_StateTypeDef ts;
    11. uint16_t xDiff, yDiff;
    13. BSP_TS_GetState(&ts);
    15. TS_State.Pressed = ts.touchDetected;
    17. xDiff = (prev_state.touchX > ts.touchX) ?
    19. (prev_state.touchX -
    20. ts.touchX) : (ts.touchX - prev_state.touchX);
    22. yDiff = (prev_state.touchY > ts.touchY) ?
    24. (prev_state.touchY -
    25. ts.touchY) : (ts.touchY - prev_state.touchY);
    27. if(prev_state.touchDetected > 0){
    29. HAL_UART_Transmit(&huart1, text, 20,
    30. 100);
    32. }
    34. if ((prev_state.touchDetected != ts.touchDetected) || (xDiff
    35. > 3)
    37. || (yDiff > 3)) {
    39. prev_state.touchDetected =
    40. ts.touchDetected;
    42. if ((ts.touchX != 0) &&
    43. (ts.touchY != 0)) {
    45. prev_state.touchX[0] =
    46. ts.touchX[0];
    48. prev_state.touchY[0] =
    49. ts.touchY[0];
    51. }
    53. GUI_TOUCH_StoreStateEx(&TS_State);
    55. }
    57. }
    Display All




    I got this code from the Internet. I figured out, that I need this to upgrade
    the Touch status and the x and y position of the touch itself.

    I also send a String to my computer every time, I touch the screen.



    #### To sum it up:

    What do I need to change inside of the main so that the added line inside my
    WindowDLG.c file gets executed?

    (Do I need to do any additional configurations of the touchscreen? Do I need to
    put the created GUI somehow in the foreground? How do I need to change the BSP_Pointer_Update Function?)

    I really hope that somebody of you could help me. I cannot find any good
    examples or tutorials about this issue which explain the WHOLE problem.



    Kind regards

    Sören

  • Hi Sören,

    This is how we have implemented the touch into one of our STM32F746 Discovery project:

    C Source Code

    1. /*********************************************************************
    2. *
    3. * PID_X_Exec
    4. */
    5. static void PID_X_Exec(void) {
    6. TS_StateTypeDef TS_State;
    7. static GUI_PID_STATE StatePID;
    8. static int IsTouched;
    10. BSP_TS_GetState(&TS_State);
    11. StatePID.Layer = 0;
    12. if (TS_State.touchDetected) {
    13. IsTouched = 1;
    14. StatePID.Pressed = 1;
    15. StatePID.x = (int)(TS_State.touchX[0]);
    16. StatePID.y = (int)(TS_State.touchY[0]);
    17. GUI_PID_StoreState(&StatePID);
    18. } else {
    19. if (IsTouched == 1) {
    20. IsTouched = 0;
    21. StatePID.Pressed = 0;
    22. GUI_PID_StoreState(&StatePID);
    23. }
    24. }
    25. }
    Display All


    Important is that you generate up events, too, at the same position as the last down event. In our project we call this function from a dedicated touch task but it should be possible to call it from within a super loop. Once the touch input is properly passed to emWin the button should react as soon as it gets pressed.

    You can also take a look into our eval package. There is a PIDConf.c,located under Start/Setup/, which contains the function above. The package is for Embedded Studio but it should work as a reference when using a different tool chain.

    The package can be found here:
    segger.com/admin/uploads/evalB…I_IP_OS_MB_USB_160708.zip

    Regards,
    Sven
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