Hi everyone,
I’m testing a custom nRF54L15 board with BLE, but it gets stuck inside bt_enable(). To debug the issue, I checked whether my 32 MHz external crystal (HFXO) is actually running by using nrf_clock_is_running(). The function shows that both HF and LF clocks are running, but the high-frequency clock source reports as RC instead of XTAL. The low-frequency crystal (32.768 kHz) looks fine.
So I tried to verify if this was a soldering issue. When I desoldered the 32 MHz crystal, the HF clock completely stopped and nrf_clock_is_running() returned 0. So I think soldering may not be the issue.
My questions are :
1. Is nrf_clock_is_running() a reliable API on nRF54L15 for checking the actual clock source?
2. How can I enable the 32 MHz external crystal instead of using the internal RC oscillator on the nrf54l15.
And here are my code for this testing:
int main(void)
{
#if defined(NRF_CLOCK_S)
NRF_CLOCK_Type *C = NRF_CLOCK_S;
#else
NRF_CLOCK_Type *C = NRF_CLOCK;
#endif
// HFXO
nrf_clock_task_trigger(C, NRF_CLOCK_TASK_HFCLKSTART);
uint32_t t0 = k_uptime_get_32();
while (!nrf_clock_event_check(C, NRF_CLOCK_EVENT_HFCLKSTARTED)) {
if (k_uptime_get_32() - t0 > 100) {
LOG_ERR("HFCLKSTARTED event not seen");
break;
}
k_busy_wait(50);
}
nrf_clock_event_clear(C, NRF_CLOCK_EVENT_HFCLKSTARTED);
nrf_clock_hfclk_t src;
bool running = nrf_clock_is_running(C, NRF_CLOCK_DOMAIN_HFCLK, &src);
LOG_INF("HF running=%d, src=%d (0=RC,1=XTAL)", running, (int)src);
nrf_clock_lfclk_t lf_src;
bool lf_running = nrf_clock_is_running(NRF_CLOCK, NRF_CLOCK_DOMAIN_LFCLK, &lf_src);
LOG_INF("LF running=%d, src=%d (0=RC,1=XTAL,2=SYNTH)", lf_running, lf_src);
}
Thank you very much for any suggestions!
