TM4C123GH6PZ: Using the RTC with the trim register

Charles Tsai said:

Hi Nadav,
Which 32.768kHz oscillator will you use? I'm referring to the oscillator datasheet for its tolerance and stability over temperature.

Hi Charles, I'm not sure what you mean, I didn't write that code so I'm still learning about the RTC.

Here is the init function:

void RTC_init(void)
{
    int32_t ui32Status = 0u;
    // Enable the Hibernation module.
    //

    SysCtlPeripheralEnable(SYSCTL_PERIPH_HIBERNATE);

    //
    // Wait for the Hibernate module to be ready.
    //
    while(!SysCtlPeripheralReady(SYSCTL_PERIPH_HIBERNATE))
    {
    }

    HibernateEnableExpClk(SysCtlClockGet());
    HibernateClockConfig(HIBERNATE_OSC_LOWDRIVE);
    HibernateRTCEnable();
    if(HibernateIsActive())
    {
    //
    // Read the status to determine cause of wake.
    //
    ui32Status = HibernateIntStatus(false);
    //
    // Test the status bits to see the cause.
    //
    if(ui32Status & HIBERNATE_INT_PIN_WAKE)
    {
    //
    // Wake up was due to WAKE pin assertion.
    //
    }
    if(ui32Status & HIBERNATE_INT_RTC_MATCH_0)
    {
    //
    // Wake up was due to RTC match register.
    //
    }
    //
    // Restore program state information that was saved prior to
    // hibernation.
    //
    //HibernateDataGet(pui32NVData, 64);
    //
    // Now that wake up cause has been determined and state has been
    // restored, the program can proceed with normal processor and
    // peripheral initialization.
    //    ui32Status = HibernateIntStatus(0);
    HibernateIntClear(ui32Status);
    RTC_GetTime();
    }
}

Which code line defines the clock source?

is it :

HibernateClockConfig(HIBERNATE_OSC_LOWDRIVE);