RE: S140 initialisation errors on nRF52840 if RTC2 interrupt enabled

Austin — Tue, 18 Jul 2017 23:20:56 GMT

This behaviour is a result of not correctly initialising the RTC2 interrupt priority. The S140 SoftDevice does not have a dependency on RTC2.

For the nRF52 S140 SoftDevice, interrupt priorities 0, 1, 4 and 5 are reserved for use by the SoftDevice. The SoftDevice expects that no other peripheral uses these reserved interrupt priorities and validates this on startup, even for peripherals which it doesn't use such as RTC2. If there are any enabled interrupts with a reserved priority configured, the NRF_ERROR_SDM_INCORRECT_INTERRUPT_CONFIGURATION error will be returned.

Assuming the correct values have been set in sdk_config.h, the following snippet will correctly initialise an RTC component.

nrf_drv_rtc_config_t rtc_config = NRF_DRV_RTC_DEFAULT_CONFIG;
err_code = nrf_drv_rtc_init(&rtc, &rtc_config, rtc_handler);

RE: S140 initialisation errors on nRF52840 if RTC2 interrupt enabled

Murugan — Tue, 18 Jul 2017 11:04:11 GMT

Check this one for External RTC : www.youtube.com/watch