Queries on RTC pre-scaler and counter registers

Question

Hello, 
 
 I am using nRF52832, SDK_15.3.0, S132 SoftDevice and Segger for flashing the image. I am using ‘ble_app_blinky’. 
 
 I have few queries on RTC. 
 
 1) There are 3 instance of RTC (RTC0, RTC1 & RTC2). 
 a) Whether PRESCALER of RTC1 can be different from PRESCALER of RTC2. 
 b) I want RTC CC interrupt for every 30 minutes. For this I am using app_timer with APP_TIMER_CONFIG_RTC_FREQUENCY as 3 so that I can have interrupt after every 30 minutes. Below is the code snapshot. At the same time if I configure RTC2 prescaler with 255 will there be any impact on app_timer.

const nrf_drv_rtc_t rtc = NRF_DRV_RTC_INSTANCE(2); /**< Declaring an instance of nrf_drv_rtc for RTC2. */
nrf_drv_rtc_config_t config = NRF_DRV_RTC_DEFAULT_CONFIG;
config.prescaler = 255;
err_code = nrf_drv_rtc_init(&rtc, &config, rtc_handler);
APP_ERROR_CHECK(err_code); 
 
 2) As above, even whether there will be COUNTER register for each instance of RTC. I want to clear COUNTER of RTC2 instance by calling nrf_drv_rtc_counter_clear(&rtc). To my understanding this will not impact COUNTER of app_timer (RTC1) 
 
 Thanks & Regards 
 Vishnu Beema

Edvin · Accepted Answer

Hello, 
 Yes, the 3 ADCs are separated peripherals, so you can configure them and use them in parallel with different settings and actions for each. 
 1a) Yes. 
 1b) Does it work? 
 2) As long as @rtc is pointing at RTC2, it is fine.

Queries on RTC pre-scaler and counter registers

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