RTOS/LAUNCHXL-CC26X2R1: Using Display_printf() in multiple tasks

Hi Bharathi,

You're code snippet doesn't tell me much. Are you calling Display_init() multiple times? Are you opening multiple display handles? Or are you using the same display handle in all of the tasks?

This is where I'm a little confused. I'm not entirely sure how all this works. Am I supposed to be calling Display_init() multiple times? I know the simple peripheral task already has a display handle set up and display initialized. From my task do I need to redo this or can I just use what simple peripheral has defined.

I have tried both, opening new display handles and using the same one. Neither of which seem to be working. The program just hangs on Display_printf().

My guess is that using the same display handle will not work since these are different tasks. So the display handle may not even be initialized while running one task or another since the other task hasn't happened yet.

Seems like I am still having the same issue. When I call Display_printf() from my task, my program crashes. 

I only open one display handle and use the same one from the simple peripheral task. In order to do so, I create an external variable in my task. Why would this be happening? Is there something else I need to do with regards to initializing the display handle?

This is what my simple peripheral task does. Not sure what the two-button menu module is, maybe this is why it's not working?

// The type of display is configured based on the BOARD_DISPLAY_USE...

  // preprocessor definitions
  if(dispHandle == NULL)
  {
      dispHandle = Display_open(Display_Type_ANY, NULL);
      
  }


  // Initialize Two-Button Menu module
  TBM_SET_TITLE(&spMenuMain, "Simple Peripheral");
  tbm_setItemStatus(&spMenuMain, TBM_ITEM_NONE, TBM_ITEM_ALL);

  tbm_initTwoBtnMenu(dispHandle, &spMenuMain, 2, SimplePeripheral_menuSwitchCb);
  Display_printf(dispHandle, SP_ROW_SEPARATOR_1, 0, "====================");

Also, I noticed that my task runs first before the simple_peripheral task when starting, so dispHandle is NULL when my task runs. In order to accommodate for that, I do the following in the second code snippet.

 if (dispHandle == NULL) {

             dispHandle = Display_open(Display_Type_UART, NULL);
       }

       Display_printf(dispHandle, 40, 0, "Starting the i2c.\n");

You should be opening the same Display handle on both opens, Display_Type_UART.

I tried that as well, but that didn't seem to work either. I came up with a temporarily solution but its not very clean and I would like to fix it. Since I am displaying something periodically, I used an external variable in the simple_peripheral task that references the variable I want to display from my task. And then use the Display_printf() command in the periodic tick function. I would like to find out the alternative correct way to do this however.