How can I get more time from the millis function?

[Stefano1984]

Hi,

I created a function like Arduino's millis which returns the number of milliseconds elapsed since the micro started executing the current program. Look down:

uint32_t millis(void)
{
    return (app_timer_cnt_get() / APP_TIMER_TICKS(1));
}

The problem is that the timer overflows every 17 minutes or so. The Arduino millis function instead overflows every 50 days.
Is there a way to increase the overflow time of my millis function?

Thank you

[Einar Thorsrud]

Hi,

If you are using a recent SDK and the app_timer implementation is app_timer2.c, then this is quite straight-forward, but you need to do a small change in the app_timer. The app_timer2 implementation use a 64 bit counter internally, so what you could do is to make get_now() non-static, and add that to  app_timer.h as shown in this diff:

Fullscreen app_timer_get_now.diff Download

diff --git a/components/libraries/timer/app_timer.h b/components/libraries/timer/app_timer.h
index cd5b6d2..7d7b854 100644
--- a/components/libraries/timer/app_timer.h
+++ b/components/libraries/timer/app_timer.h
@@ -311,6 +311,11 @@ void app_timer_pause(void);
  */
 void app_timer_resume(void);
 
+/**
+ * @brief Return current 64 bit timestamp
+ */
+uint64_t get_now(void);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/components/libraries/timer/app_timer2.c b/components/libraries/timer/app_timer2.c
index dfafbcb..cfa28f7 100644
--- a/components/libraries/timer/app_timer2.c
+++ b/components/libraries/timer/app_timer2.c
@@ -113,7 +113,7 @@ NRF_SORTLIST_DEF(m_app_timer_sortlist, compare_func); /**< Sortlist used for sto
 /**
  * @brief Return current 64 bit timestamp
  */
-static uint64_t get_now(void)
+uint64_t get_now(void)
 {
     uint64_t now = m_base_counter + drv_rtc_counter_get(&m_rtc_inst);
 

[Stefano1984]

Thanks for the answer but I don't understand what get_now returns. Milliseconds like millis?
How do I get milliseconds?

[Stefano1984]

I'm using a NINA-B3 module where the nRF52840 microcontroller is present.