Time measure

[Pask]

How can I measure how much time the system is started

[Giovanni]

chTimeNow()or you can use the RTC.

Giovanni

[Pask]

i am using chTimeNow():

if (chTimeNow()>0)
do something

Why if is never verified?

[Giovanni]

Because there is a problem somewhere not evident in the code you posted, the time should increase continuously.

Giovanni

[fred]

If granularity on the scale of a second is good enough, use the RTC_EVENT_SECOND :

Code: Select all

//seconds since boot tracker
uint32_t secondsSinceBoot = 0;

static void  RTC_callback(RTCDriver *rtcp, rtcevent_t event) {
  (void)rtcp;

  switch (event) {
    case RTC_EVENT_OVERFLOW:    break;
    case RTC_EVENT_SECOND: /* every second update code here */
                                secondsSinceBoot++;
                                break;
    case RTC_EVENT_ALARM:       break;
    default:                    break;
  }
}


//somewhere in your initialisation:
rtcSetCallback(&RTCD1, RTC_callback);
...

[Pask]

Because there is a problem somewhere not evident in the code you posted, the time should increase continuously.

Giovanni

i don't understand. How can i do

if(chTimeNow()>MS2ST(10))
do...


???

[Giovanni]

chTimeNow() returns the value of a counter that is increased by a timer so:

1) Check that interrupts are enabled where you perform the check.
2) Make sure the timer is working.

If you want detailed help then give context, hint, 2 lines of code are not sufficient.

Giovanni