NRF51802內部時鐘校準

void lfclk_calibrate()
{
    NRF_CLOCK->LFCLKSRC = (CLOCK_LFCLKSRC_SRC_RC << CLOCK_LFCLKSRC_SRC_Pos);
  
    NRF_CLOCK->EVENTS_LFCLKSTARTED = 0;
    NRF_CLOCK->TASKS_LFCLKSTART = 1;
  
    while(NRF_CLOCK->EVENTS_LFCLKSTARTED == 0);
  
    NRF_CLOCK->EVENTS_HFCLKSTARTED = 0;
    NRF_CLOCK->TASKS_HFCLKSTART = 1;
    while(NRF_CLOCK->EVENTS_HFCLKSTARTED == 0);
  
    NRF_CLOCK->EVENTS_DONE = 0;
    NRF_CLOCK->TASKS_CAL = 1;
  
    while(NRF_CLOCK->EVENTS_DONE == 0);
  
    NRF_CLOCK->TASKS_HFCLKSTOP = 1;
}

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