nRF52840 how do I get RTC ticks in multi-link central example

[Philip]

Hi all. I would like to get the current RTC tick when there is an advertisement RX event on multi-link central. I am going to store the advertisements along with a time i.e. how recent the data is.

I have added;

uint32_t ticks = app_timer_cnt_get();

This just returns the same value on each advertisement RX event i.e. it never changes.

I tried to start the app_timer with below, but timer is not running? 

What is the easiest was to get a rough count. Doesn't need to be 100% accurate, or equate to unit such as mS.

Thanks in advance

/** @brief Function for initializing the timer.
 */
static void timer_init(void)
{
    ret_code_t err_code = app_timer_init();
    APP_ERROR_CHECK(err_code);

    app_timer_start(adv_timer,65000,NULL);
}

[Turbo J]

Check the return value on your app_timer_start() call, you forgot to register your timer.

APP_TIMER will stop the RTC when there are no timers running, unless APP_TIMER_KEEPS_RTC_ACTIVE is set to nonzero.

[Philip]

Thanks. I have registered the timer if this is what you mean;

APP_TIMER_DEF(adv_timer);

If I do an APP_ERROR_CHECK on the app_timer_start there is a Fatal system error for some reason, so had to delete that error check. Not sure why since it should return a ret_code_t type

[Turbo J]

That APP_TIMER_DEF() only defines a few variables. You are still missing the calls to app_timer_create().

Those error codes are supposed to tell you that something is WRONG WITH YOUR CODE.

[Philip]

YES I KNOW obviously, or I wouldn't be asking a question. I tried to read the error code in the first place, and the system crashes for some reason at APP_ERROR_CHECK(err_code).

I have setup a new RTC timer now which works fine and ditched the app_timer.

Thanks HAVE A NICE DAY

[Simon]

Did you find a sufficient solution, or do you need any more help?