nrf5_calendar example callback function?

[dalsee]

Hello,

I am using nrf52840 and SDK 16.0.0

I am doing some work with the calendar example and got some questions.

Q1.

Inside the main function in main.c file there is nrf_cal_set_callback(calendar_updated, 4); function. How it can be called multiple times even though it is defined before the while(true) loop? How does it work?

Q2.

I am integrating ble_app_template example with this calendar example. My beacon is broadcasting advertisement packets. If I wanna update manufacturer specific data(lets say a time stamp) every 1 second, is it possible to locate advertisement update function inside this call back function(nrf_cal_set_callback())?

Thank you.

[Jørgen Holmefjord]

Hi,

Q1. When you call nrf_cal_set_callback(), this tells the nrf_calendar library which function to call with events. The callback will be called whenever the nrf_calendar library has an event for the application. The calendar library uses the RTC peripheral to keep track of time, which will generate interrupts on given conditions. From the interrupt handler, the application callback will be called if there are relevant events for the application.

Q2. This looks ok to me.

Best regards,
Jørgen

[Jørgen Holmefjord]

Yes, that is correct. That line is a reference to a register in the RTC peripheral itself. CAL_RTC is defined in the header, allowing you to easily change it if the default RTC instance used is occupied by other libraries (RTC0 is by default used by the softdevice when running BLE application).

[dalsee]

Thanks for your reply. However, whenever I try to use RTC1 by changing #define in the header it returns this compile error. So I had to use RTC2 instead because it does not return any error. Could you kindly explain this situation please? Thank you !!

[Jørgen Holmefjord]

You get this error because you have the app_timer library included in your application, which uses RTC1.