CrossWorks AVR 2.0 - ATmega2560 - Timer0 does not work in simulator

Hey µC Friends, I was trying to port my Amega2560 code (in AVR Studio) to CrossWorks 2.0 AVR. But I already failed setting up Timer0.

I tested this code with the Avr Studio compiler and simulator, and I saw the TCNT0 counting:

TCNT0 = 0;
OCR0A = 249;
TIMSK0 = 0x02;
TCCR0A = 0x02;
TCCR0B= 0x01;
SREG |= 0x01;

But if I add that code to the initial CTL code of Crossworks 2.0 AVR (see below) and run the compilation in the simulator, I can NOT see that TCNT0 is counting

#include <string.h>
#include <ctl_api.h>
#include <ATmega2560.h>

CTL_TASK_t main_task, new_task;

#define CALLSTACKSIZE 16 // this is only required for AVR builds
#define STACKSIZE 64          
unsigned new_task_stack[1+STACKSIZE+1];

void 
new_task_code(void *p)
{  
  unsigned int v=0;

  

  while (1)
    {      
      // task logic goes here      
      v++;
    }  
}

void
ctl_handle_error(CTL_ERROR_CODE_t e)
{
  while (1);
}

int main(void)
{
  unsigned int v=0;

  TCNT0 = 0;
  OCR0A = 249;
  TIMSK0 = 0x02;
  TCCR0A = 0x02;
  TCCR0B= 0x01;
  SREG |= 0x01;

  ctl_task_init(&main_task, 255, "main"); // create subsequent tasks whilst running at the highest priority.
  ctl_start_timer(ctl_increment_tick_from_isr); // start the timer 
  memset(new_task_stack, 0xcd, sizeof(new_task_stack));  // write known values into the stack
  new_task_stack[0]=new_task_stack[1+STACKSIZE]=0xfacefeed; // put marker values at the words before/after the stack
  ctl_task_run(&new_task, 1, new_task_code, 0, "new_task", STACKSIZE, new_task_stack+1, CALLSTACKSIZE);
  //ctl_task_set_priority(&main_task, 0); // drop to lowest priority to start created tasks running.
  
  while (1)
    {    
      // power down can go here if supported      
      v++;
    }
  return 0;
}

I really don't know what's wrong and would be glad if someone has a solution/hint for that.

Thank you!

Peter

CrossWorks AVR 2.0 - ATmega2560 - Timer0 does not work in simulator

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