STM32F746G-DISCO Touchscreen gestureId issues

[BJAUM]

Hi,

I'm working on a project which needs to ​get the gesture of the user on the touchscreen.

Apparently the "BSP_TS_GetState(TS_StateTypeDef *TS_State)" function fills a structure of TS_StateTypeDef type.

typedef struct
{
  uint8_t  touchDetected;
  uint16_t touchX[TS_MAX_NB_TOUCH];
  uint16_t touchY[TS_MAX_NB_TOUCH];
 
#if (TS_MULTI_TOUCH_SUPPORTED == 1)
  uint8_t  touchWeight[TS_MAX_NB_TOUCH];
  uint8_t  touchEventId[TS_MAX_NB_TOUCH];
  uint8_t  touchArea[TS_MAX_NB_TOUCH];
  uint32_t gestureId;
#endif
 
} TS_StateTypeDef;

The ​TS_StateTypeDef contains the gestureId variable which takes the value of type @ref TS_GestureIdTypeDef. (GEST_ID_MOVE_UP, GEST_ID_MOVE_DOWN...)

typedef enum
{
  GEST_ID_NO_GESTURE = 0x00, /*!< Gesture not defined / recognized */
  GEST_ID_MOVE_UP    = 0x01, /*!< Gesture Move Up */
  GEST_ID_MOVE_RIGHT = 0x02, /*!< Gesture Move Right */
  GEST_ID_MOVE_DOWN  = 0x03, /*!< Gesture Move Down */
  GEST_ID_MOVE_LEFT  = 0x04, /*!< Gesture Move Left */
  GEST_ID_ZOOM_IN    = 0x05, /*!< Gesture Zoom In */
  GEST_ID_ZOOM_OUT   = 0x06, /*!< Gesture Zoom Out */
  GEST_ID_NB_MAX     = 0x07  /*!< max number of gesture id */
 
} TS_GestureIdTypeDef;

So in my program i wrote :

//The full code is way more complicated, this part is just the problematic part
TS_StateTypeDef TS_Status; //My structure which will contain all the Touchscreen Datas
char buffer[50];//Text buffer
 
int main(void)
{
  //Fill the TS_Status structure with the Touchscreen datas 
  BSP_TS_GetState(&TS_Status);
 
  //Display on the LCD the TS_Status.gestureId Variable
  sprintf(buffer, "%d", TS_Status.gestureId);
  BSP_LCD_DisplayStringAt(0, LINE(0), &buffer, LEFT_MODE);
}

The problem is that BSP_TS_GetState(&TS_Status) always returns TS_Status.gestureId at 0, even if i move my finger up, down, left...

I already tried with the BSP_TS_Get_GestureId(&TS_State) function, same problem...

Thank you for your help,

Mathieu.

[Amel NASRI]

Hi @BJAUM​ ,

Is only the gestureId which is wrong?

What do you get if you want to display touchX and touchY for example?

For the gestureId, you need to call ts_gesture_id_string_tab like what it is already done in STM32Cube_FW_F7_V1.12.0\Projects\STM32F769I-Discovery\Examples\BSP\Src\touchscreen.c:

      /* Get updated gesture Id in global variable 'TS_State' */
      ts_status = BSP_TS_Get_GestureId(&TS_State);
 
      sprintf((char*)lcd_string, "Gesture Id = %s", ts_gesture_id_string_tab[TS_State.gestureId]);
      BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
      BSP_LCD_DisplayStringAt(0, BSP_LCD_GetYSize() - 15, lcd_string, CENTER_MODE);

Please try this way and let me know if this works for you.

-Amel

[Amel NASRI]

I would like to add that ts_gesture_id_string_tab is declared in STM32Cube_FW_F7_V1.12.0\Drivers\BSP\STM32F769I-Discovery\stm32f769i_discovery_ts.c as following:

/* Table for touchscreen gesture Id information display on LCD : table indexed on enum @ref TS_GestureIdTypeDef information */
char * ts_gesture_id_string_tab[GEST_ID_NB_MAX] = { "None",
                                                    "Move Up",
                                                    "Move Right",
                                                    "Move Down",
                                                    "Move Left",
                                                    "Zoom In",
                                                    "Zoom Out"
                                                  };
 

-Amel

[john doe]

the firmware of the touch screen controller that st used, does not have gestures enabled

[MWang.2]

Hi,BJAUM:

Have you fixed this issue, I'm confused about the issue too.