CC2541 OSAL Timer not work after wake up from PM2

Hi all,

I am working on CC2541 Low power modes.

I tested the PM2 and it is wake up by using external Interrupt.

I found that the  osal_start_timerEx() function not working.

Timer does not expire to set the event.

Can i know the issue behind it?

This is my sleep mode Entry code.

#define HAL_SLEEP_SET_POWER_MODE( mode )                                     
  st( SLEEPCMD &= ~PMODE;                                                    
      SLEEPCMD |= (mode);                                                                                                                                   
       halSetSleepMode();                                                     
       )

void setup_port_interrupt(void)
{
    // Clear Port 0 Interrupt flags.
    P0IF = 0;
    P0IFG = 0x00;

    // Interrupt enable on all pins on port 0.2.
    P0IEN = 0x04;   

    // Enable CPU Interrupt for Port 0 (IEN1.P0IE = 1).
    P0IE = 1;

    // Enable Global Interrupt by setting the (IEN0.EA = 1).
    EA = 1;
}

#pragma vector = P0INT_VECTOR
__interrupt void port0_isr(void)
{
    // Note that the order in which the following flags are cleared is important.

      // Clear Port 0 Interrupt Flags.
    P0IFG = 0x00;

    // Clear CPU Interrupt Flag for P0 (IRCON.P0IF = 0).
    P0IF = 0;

    // Set LED1 to indicate Active Mode.
    
    
    CLEAR_SLEEP_MODE();
    
 
}

void halSleep( uint32 osal_timeout )
{
 
 
  // Initialize P1_0for SRF05EB LED1.
    P1SEL &= ~(0x01);           // Function as General Purpose I/O.
    P1_0 = 1;                 // LED1 on.
    P1DIR |= 0x01;            // Output.

    // Initialize P0_0 for SRF05EB S1 button.
    P0SEL &= ~(0x04);          // Function as General Purpose I/O.
    P0DIR &= ~(0x04);          // Input.
    P0INP |= 0x04;             // 3-state input.
 
 
      setup_port_interrupt();
 
      halPwrMgtMode = HAL_SLEEP_TIMER;


      HAL_SLEEP_SET_POWER_MODE( halPwrMgtMode );
      
       
       HAL_ENABLE_INTERRUPTS();
      
      


  return;
}

Can anyone help me to solve the problem?

Thanks

Arul