chThdSleepUntil() ??

[tfAteba]

I saw that Giovanni gave you also the same link in another topic. (http://chibios.org/dokuwiki/doku.php?id=chibios:kb:timing)

So try to read thing carrefully and make some tests.

For me the anwer to your problem is there.

cheers, Theo.

[tfAteba]

If you already try it and still have an error, I think that some thing in your code introduce that.

This your thread have the High priority compared to the other threads?

Try also to use the debugger to see what going on.

Giavanni give me this link in the morning: http://www.chibios.org/dokuwiki/doku.php?id=chibios:articles:debug_guide

Note also that I can't realy help further, I don't have your code.

If another person have ideas He will be welcom.

Cheers, Theo.

[RTOSman]

Thanks could you make a test in your side that you execute a function every an inteval of 10 MS ?

[tfAteba]

Hi,

Yes will .

Theo

[RTOSman]

Hi again
Tell me the funcy=tion chThdSleepUntil() stert counting frm the zero every time we call it ? or it start once we calle it and continu to count ?

[tfAteba]

Hi ,

Did you read the reference manual?

The function is describe like this: chThdSleepUntil() function Suspends the invoking thread until the system time arrives to the specified value.

So for me when you call it, your argument is the deadline for your thread to be executed.

How do you mesure the time to see that you have 40ms of errors after some running time?

cheers,

Theo.

[RTOSman]

Yes i know but i don't now if the function restart the value or it keep the last value ? after her execution!!!

[RTOSman]

I changed the program, i did a chtsleemmillis()

Code: Select all

void mainThread() {


   chThdCreateStatic(waThread1, sizeof(waThread1), NORMALPRIO+1, Thread1, NULL);
   chThdCreateStatic(waThread2, sizeof(waThread2), NORMALPRIO, Thread2, NULL);
   
   
}
[code]
static THD_FUNCTION(Thread1, arg) {
[code]start= millis();
for (b = 0; b <100;b++)
   {
      geting_sample();
      chThdSleepMilliseconds(10);
      fin = millis();
   }
}
[/code]

[code]static THD_FUNCTION(Thread2, arg) {
   
while (1)  {

   Serial.print(sys);
      Serial.print((" "));
      Serial.print(b);
      Serial.print(("*"));
      Serial.println(fin);
}
}
[/code]


the resulte

500 0*0
500 0*0
500 0*0
500 1*510
500 1*510
500 1*510
500 1*510
500 1*510
500 1*510
500 1*510
500 1*510
500 1*510
500 1*510
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500 2*531
500 3*531
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500 3*541
500 4*541
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500 5*551
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500 62*1135
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500 94*1463
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500 95*1473
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500 98*1504
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500 99*1514
500 99*1514
500 99*1514
500 100*1524[code]

i did did sys-start= i had 1024 MS so i have 24 ms errors . i want to delete the 24, i want 1000 MS exactely how we do that ??

[tfAteba]

Hi,

Sorry I was too busy today.

I will tray to reproduce what you want and share but only if I have the time.

Just for information, I found some functions which can help to measure time easily.

Read the RT Reference manual to see how to use them. Here are the functions: chTMStartMeasurementX() and chTMStopMeasurementX()

Theo

[RTOSman]

Thanks i will take a look
me i want to get a sample every 10 MS not after not befor i think chibios not really performed or me who can't to program that