Tracking Current Time in NRF9160

[Rajender]

Hi,

we are using NRF9160 based Custom board with Zephyr,

I want to track the Current time in IST format and i need to generate an event to DPPI on particular time (ex: every day10am), but i am not understanding where to start, so please help me to understand where to start?

Best Regards

Rajender.

[Hakon]

Hello,

have you looked at this code? It shows how DPPI can be configured properly. One thing that you are missing is allocating the DPPI channel with nrfx_dppi_channel_alloc().

[Rajender]

Hi,

finally now i can toggle my led with RTC event NRFX_RTC_INT_TICK , 

But i want to add NRFX_RTC_INT_COMPARE0 event to DPPI, here my problem to add NRFX_RTC_INT_COMPARE0 event is, i need to reload compare register value every time to generate the event for next 1 sec. so how can i do that without event handler (i dont want to use any event handler for RTC, becoz i dont want to disturb CPU for every single second)

is it possible to call a function uisng dppi after event triggered?

for your reference i am attaching my working project for rtc+dppi+gpio

working_timer_test_nrfx.zip

Best Regards

Rajender 

[Rajender]

Hi hakon,

any update for me?

1. how can i update cc[0] with latest compare value to get event for next second without event handler

NOTE: How can i config NRFX_RTC_INT_COMPARE0 event to repeat itself after cc[0] register value, i have seen this in nrf_calendar.h, in which compare event triggering it self repeatedly.

https://github.com/NordicPlayground/nrf5-calendar-example/blob/master/nrf_calendar.c

2. how can i increment a variable by mapping with DPPI after a NRFX_RTC_INT_COMPARE0 event(here i want to increment my seconds variable)

Best Regards

Rajender

[Hakon]

I want to track the Current time in IST format and i need to generate an event to DPPI on particular time (ex: every day10am)

What task will you connect the DPPI event to?
What is it for ? Toggling a LED, or something else?

[Rajender]

Hi

We want to track the current time with the help of a variable "seconds", so we need to update seconds variable for every second by using DPPI after NRFX_RTC_INT_COMPARE0 event without event handler.

Best regards

Rajender

[Hakon]

Rajender said:

1. how can i update cc[0] with latest compare value to get event for next second without event handler

You can use this register to clear it.

Rajender said:

2. how can i increment a variable by mapping with DPPI after a NRFX_RTC_INT_COMPARE0 event(here i want to increment my seconds variable)

You can use timer counter mode.

Also, have you considered using the Zephyr timer library to keep track of time? It seems like an easier solution than yours.