RE: Radio (BLE 1MBit mode) not receiving frames right after HFXO startup and stabilization

ovrebekk — Mon, 24 Oct 2022 08:04:28 GMT

Hi Mateusz

Good to hear you found a solution to your problem. I will consider the case closed then 🙂

Best regards
Torbjørn

RE: Radio (BLE 1MBit mode) not receiving frames right after HFXO startup and stabilization

matkub — Thu, 20 Oct 2022 09:43:10 GMT

OK, I came up with an indea. Only in one case reference manual explicitly says that the clock is ready and stable - when EVENT_HFCLKSTARTED is set. There is no such thing for HFCLKSTAT.STATE which is checked by nrf_clock_hf_is_running().

The solution:
// somewhere in the code the clock is stopped
nrf_clock_task_trigger(NRF_CLOCK_TASK_HFCLKSTOP);
// MCU is working with sth
// ..... IDLE state, HF domain inactive
// MCU wakes up clocked by HFINT (internal RC)
// MCU is working with sth
// HFXO clock is enabled
nrf_clock_event_clear(NRF_CLOCK_EVENT_HFCLKSTARTED);
nrf_clock_task_trigger(NRF_CLOCK_TASK_HFCLKSTART);
// MCU is working with sth
// .....
// wait for clock to be stable
while (!nrf_clock_event_check(NRF_CLOCK_EVENT_HFCLKSTARTED))
;
// turn on radio immediately
nrf_radio_task_trigger(NRF_RADIO_TASK_RXEN);

Problems are often solved when they are reconsidered with the goal of passing them on to someone else 🙂