RE: NRF 51822, RTC 0 or RTC 1 together with BLE.

Vidar Berg — Fri, 11 Oct 2019 12:50:31 GMT

Good to hear that you found a solution. Thanks for updating the case. Another alternative that you may consider as well is to keep the Softdevice enabled even if you don't need it, but just stop any ongoing BLE advertising to prevent connections. The Softdevice will leave the LF clock running. Though you will need to disable the Softdevice to access RTC0.

RE: NRF 51822, RTC 0 or RTC 1 together with BLE.

Tails2 — Fri, 11 Oct 2019 10:53:09 GMT

I solved the problem.

static void lfclk_config(void)
{
nrf_clock_xtalfreq_set(CLOCK_CONFIG_XTAL_FREQ);
nrf_clock_lf_src_set((nrf_clock_lf_src_t)CLOCK_CONFIG_LF_SRC);
nrf_drv_common_irq_enable(POWER_CLOCK_IRQn, 3);
__disable_irq();
*((volatile uint32_t *)((uint8_t *)NRF_CLOCK + NRF_CLOCK_TASK_LFCLKSTART)) = NRF_CLOCK_TASK_TRIGGER;
nrf_task_triger((uint32_t*)NRF_CLOCK,NRF_CLOCK_TASK_LFCLKSTART);
__enable_irq();
}