STM32H7 mbed timeout Stop, Pause, Maskout what is best options?

[DaveBy2]

Hi All
I am having trouble using Timeout.    From my main loop if i write to my LCD i want to set a timer for 10sec for the backlight.  Then turn off backlight after the 10sec.    I can get this and the callback routine routine to work quite simply.   But i think there is exception if the timout interupt is called when the LCD is in the middle of doing something.   This is my code.

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using namespace std::chrono;

Timeout toutTest;
Timer timerTest;
volatile bool lcdTimmerFlag =0 ;

  // Print to LCD
  /*!
    @param    Message       [in] String or character for LCD to Print
    @param    clearLcdFirst [in] Clear screen first, Yes No
    @param    Pos           [in] Position of cursor, Default = 0
    @param    Line          [in] Line number, 0 = ist line, 1 = 2nd Line, Default = 0
  */
    void lcdPrint (const char* Message, bool clearLcdFirst = true,int Pos =0,
                   int Line =0){
        microseconds toutRemain = toutTest.remaining_time();
        timerTest.stop();

        if (clearLcdFirst == true) {lcd.clear();}
        lcd.setCursor(Pos,Line);
        lcd.print(Message);

        if (lcdTimmerFlag == FALSE){
         
          lcdBackLight(ON);
          timerTest.start();
           toutTest.attach(&lcdBackLightOff, 10s);
           lcdTimmerFlag = TRUE;

        } else { 
          timerTest.start();
          toutTest.attach(&lcdBackLightOff, toutRemain);
         }
      }
  //

  void lcdBackLightOff() {
    timerTest.stop();
    toutTest.detach();
    lcdBackLight(OFF);
    lcdTimmerFlag = FALSE;
    }
I belive i cant disable the interupt so i have attempted to: 1, stop the timer,  2, read the 'timeout.remaining_time()'  3, DO LCD instructions  4, reattached timeout with remainder.

Am i completly barking up the wrong tree here?

a few other problems i am having is the following line in PIO is always <opimised out> .   So it cant be used.

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microseconds toutRemain = toutTest.remaining_time();
if i volitile it ie

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volatile microseconds toutRemain = toutTest.remaining_time();  then the line   

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toutTest.attach(&lcdBackLightOff, toutRemain); brings up a TYPE error.

Any experience or examples would be greatly appreciated.  Cheers