chThdSleepUntil() ??

ChibiOS public support forum for topics related to the Atmel AVR family of micro-controllers.

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RTOSman
Posts: 29
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Re: chThdSleepUntil() ??

Postby RTOSman » Tue Feb 09, 2016 2:54 pm

Code: Select all

static THD_FUNCTION(Thread1, arg) {
   timeT = ST2MS(chVTGetSystemTime());
    while (1)
    {      
       My_func();
       chThdSleepUntil(MS2ST(timeT) );
       timeT += ST2MS(9);
   }

}


la led clignote exactement chauque 1MS mais apres 3 minutes j'ai une un erreur de 0.40 Secondes .
c'est quoi le souci

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tfAteba
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Re: chThdSleepUntil() ??

Postby tfAteba » Tue Feb 09, 2016 3:14 pm

ok, can you share all your chibios project?
Then I'm going to do some test on my side!

We can communicate on the irc if you want tonight to have a live discution. I'will be connected at 20H30.

Thanks,

Theo

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tfAteba
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Re: chThdSleepUntil() ??

Postby tfAteba » Tue Feb 09, 2016 3:15 pm

You can also read this it can sove your problem:
http://www.chibios.org/dokuwiki/doku.php?id=chibios:kb:timing

RTOSman
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Re: chThdSleepUntil() ??

Postby RTOSman » Tue Feb 09, 2016 3:36 pm

Je peux pas car, car c'est un projet pro, dans un cadre de R&D :) ya des fichier.h et .cpp que j'ai pas l'autorisation de les publié
jusye une question, tu sais comment faire un chronomètre. je veux chronométrer ma boucle while ??

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tfAteba
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Re: chThdSleepUntil() ??

Postby tfAteba » Tue Feb 09, 2016 3:53 pm

You have an exemple on how to make a real time tack on the demo directory. But for that you have to use for exemple ChibiOS_16.0.3
The demo is locate in ChibiOS_16.1.3\demos\AVR\RT-ARDUINOUNO

This demo blink the LED every second.

To mesure a time execution you can use 2 variables for exemple start, stop and the debuger to see the difference.

RTOSman
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Re: chThdSleepUntil() ??

Postby RTOSman » Tue Feb 09, 2016 4:08 pm

ok thanks :)
so could you give write me a program that start evey 10MS exactely.
thanks

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tfAteba
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Re: chThdSleepUntil() ??

Postby tfAteba » Tue Feb 09, 2016 4:15 pm

Take a look at the exmple everything is done. ChibiOS_16.1.3\demos\AVR\RT-ARDUINOUNO/ in the main.c
You just need a little modification to reach your gaol.

Did you try this?

Code: Select all

static THD_FUNCTION(Thread1, arg) {
  (void)arg;
  chRegSetThreadName("Blinker");
  while (true) {
    palTogglePad(IOPORT2, PORTB_LED1);
    chThdSleepMilliseconds(10);
  }
}


cheers,

Theo.

RTOSman
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Re: chThdSleepUntil() ??

Postby RTOSman » Tue Feb 09, 2016 4:56 pm

i told you i will not use sleepmilli function, i want my thread execute evey 10 ms, so i have to use sleepuntil :)
if my functiin take some microsecondes and i use sleep after the time incremente :) so we have to avoid sleep
my probleme is that i could'nt eliminate the errors

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tfAteba
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Re: chThdSleepUntil() ??

Postby tfAteba » Tue Feb 09, 2016 5:36 pm

If you want to remove errors over the time, you have then to use absolute deadlines rather than fixed intervals as in my previous code.

you have an exemple here: http://www.chibios.org/dokuwiki/doku.php?id=chibios:kb:timing

You will then have the above code:

Code: Select all

msg_t my_thread(void *param) {
 
  systime_t time = chVTGetSystemTimeX(); // T0
  while (true) {
    time += MS2ST(10);  // Next deadline
    do_something();
    chThdSleepUntil(time);
  }
}

That what you want to do ;) .

cheers,

Theo.

RTOSman
Posts: 29
Joined: Mon Feb 01, 2016 6:11 pm

Re: chThdSleepUntil() ??

Postby RTOSman » Tue Feb 09, 2016 5:44 pm

yes i did this but i still got errors :)
after 3 minutes


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