how call value of timer and print with SEGGER_RTT_printf()

[tytomulyono]

hi, my name is tyto
I just learned programming about nrf52832, before I used to work with Arduino, after trying to learn nrf52832, it turned out to be very difficult for me to understand the example program in the Nordic SDK.

I am trying a timer, in Arduino I usually call the millis () function, but in Nordic there is no such function. what should i use?

I have tried RTC but there is no time value that I can display to SEGGER_RTT_printf ()

please help the solution.

[Kenneth]

Hi,

You can check out the app_timer library:
http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.2.0/lib_timer.html?cp=4_0_0_3_51 

Then you can use the app_timer_cnt_get() and app_timer_cnt_diff_compute() to find how much time has elapsed.

Best regards,
Kenneth

[tytomulyono]

hi...

my app_timer when i try to include the app_timer.h, the function app_timer_cnt_get() is undefined.

this my screen shoot app_timer.c

[Kenneth]

Typically it needs to be enabled in sdk_config.h (snapshot from random ble example that use app_timer):

[tytomulyono]

there is no app_timer_enabled

[tytomulyono]

i was try with other sample, and i get value from app_timer_cnt_get() and app_timer_cnt_diff_compute(), but what is the unit of the value.

And the value is static, every time i call, the value is never change

[Kenneth]

Have you created and started a timer? You may need a dummy app_timer to run in the background at a long interval (max is 250seconds).

Best regards,
Kenneth