MQX Software SolutionsのトピックNeed advice for a beginner

Need advice for a beginner

Rox — Thu, 29 Oct 2020 08:57:49 GMT

Hi, guys.

I just started working with operating systems. And MQX is my first one.

Recently I learned to do some simple things with the help of examples and application notes. It's an exciting process

And I have one question. What is the best way to organaize regular execution of task every 1 ms (its execution time is about 150us)? I tried to do that in such way:

if (_timer_create_component(7, 1500) != MQX_OK) printf ("  Timer initializing error\n");else printf(" Timer initialize\n");_time_init_ticks(&ticks, 0);_time_add_msec_to_ticks(&ticks, 1);//_time_add_sec_to_ticks(icks, 1);SPI_timer = _timer_start_periodic_at_ticks(led_driver_task, 0, TIMER_ELAPSED_TIME_MODE, &ticks, &ticks);

It's work fine only when i use the seconds/(hundreds of ms) as a period.

And in such way:

task(){  while(1){    my_function(&trans_matrix[0][0][0]);    _time_delay(1);  }}

How would you have done this in my place?

Regards, Rasul

P.S. How is my English? Is it too many mistakes here?

Re: Need advice for a beginner

Rox — Sun, 15 Apr 2012 22:17:51 GMT

I did it.

Using ISR from second timer MTIM2.

I think it is a best decision.

Re: Need advice for a beginner

Rox — Thu, 29 Oct 2020 08:57:51 GMT

Hi again!

My problem was solved by following change in the MQX source code:

uint_32 _mcf51CN_timer_init_freq (........){  ............  // calculating prescale and rate  ............  /* set registers */  /* mtim_ptr->MTIMCLK = ((uint_8) prescale);   mtim_ptr->MTIMMOD = (uint_8) rate - 1;   mtim_ptr->MTIMSC = MCF51XX_MTIMSC_TRST_MASK | (unmask_timer ? MCF51XX_MTIMSC_TOIE_MASK : 0); */  mtim_ptr->MTIMCLK = 0x07;       // this value and value below are manualy calculated with process expert  mtim_ptr->MTIMMOD = 0xF3;   mtim_ptr->MTIMSC = MCF51XX_MTIMSC_TRST_MASK | (unmask_timer ? MCF51XX_MTIMSC_TOIE_MASK : 0);}

My project is already finished, and it works fine.

But I noticed that some timer functions like _time_delay() didn't worked properly. Generated time durations was changed. This is not a critical issue for my project.

And I understand that this is because of my change of MQX source code.

So my question: Can this change cause any other problems except described above?

Any answer would be greatly appreciated!!

MQX 3.6 was used.

Regards.